Exhibit 3.3

RESTATED CERTIFICATE OF INCORPORATION

OF

CELANESE CORPORATION

(Originally incorporated on November 3, 2004)

Article I

Section 1.1    Name. The name of the Corporation (the “Corporation”) is: Celanese Corporation.

Article II

Section 2.1    Address. The registered office in the State of Delaware is Corporate Creations Network Inc., 1521 Concord Pike, Suite 201, Wilmington, New Castle County, Delaware 19803. The name of its registered agent at such address is Corporate Creations Network Inc.

Article III

Section 3.1    Purpose. The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the “DGCL”).

Article IV

Section 4.1    Capitalization. (a)          The total number of shares of stock that the Corporation is authorized to issue is 500,000,000 shares, consisting of (i) 400,000,000 shares of Common Stock, par value $0.0001 per share (“Common Stock”), and (ii) 100,000,000 shares of Preferred Stock, par value $0.01 per share (“Preferred Stock”).

(b)           Change of Designation. (1) Effective September 17, 2018 (the “Effective Time”), each share of Series A Common Stock issued and outstanding immediately prior to the Effective Time shall be redesignated into one share of Common Stock without further act or deed of the holder thereof; (2) any stock certificate that, immediately prior to the Effective Time, represented shares of Series A Common Stock shall, from and after the Effective Time, and without further act or deed of the holder thereof, represent the number of shares of Common Stock into which such shares of Series A Common Stock have been redesignated, and (3) following the Effective Time, each new share of Common Stock issued by the Corporation shall be evidenced by a certificate denominated “Common Stock” approved by the Board of Directors.

Section 4.2    Preferred Stock. The Board of Directors is hereby expressly authorized, by resolution or resolutions, to provide, out of the unissued shares of Preferred Stock, for series of Preferred Stock and, with respect to each such series, to fix the number of shares constituting such series and the designation of such series, the voting powers (if any) of the shares of such series, and the preferences and relative, participating, conversion, optional or other special rights, if any, and any qualifications, limitations or restrictions thereof, of the shares of such series, as are not inconsistent with this Restated Certificate of Incorporation or any amendment hereto, and as may be permitted by the DGCL. The powers, preferences and relative, participating, conversion, optional and other special rights of each series of Preferred Stock, and the qualifications, limitations or restrictions thereof, if any, may differ from those of any and all other series at any time outstanding.

Section 4.3    Common Stock.

(a)           General. Except as provided in this Section 4.3 or as otherwise required by the DGCL, all shares of Common Stock shall have the same powers, privileges, preferences and relative participating, optional or other special rights, and the qualifications, limitations or restrictions thereof, and shall be identical to each other in all respects.

(b)           Dividends. Subject to applicable law and rights, if any, of the holders of any outstanding series of Preferred Stock or any class or series of stock having preference over the right to participate with the Common Stock with respect to the payment of dividends, dividends may be declared and paid on the Common Stock out of the assets of the Corporation which are by law available therefor at such times and in such amounts as the Board of Directors in its discretion shall determine.

(c)           Voting Rights. Each holder of record of Common Stock shall have one vote for each share of Common Stock that is outstanding in his, her or its name on the books of the Corporation and which is entitled to vote. The holders of record of Common Stock shall vote as a single class on all matters, except as otherwise required by law or this Restated Certificate of Incorporation or any amendment hereto. In the election of directors, each stockholder shall be entitled to cast for any one candidate no greater number of votes than the number of shares held by such stockholder; no stockholder shall be entitled to cumulate votes on behalf of any candidate. Except as otherwise required by law, holders of record of Common Stock shall not be entitled to vote on any amendment to this Restated Certificate of Incorporation or any amendment hereto (including any certificate of designations relating to any series of Preferred Stock) that relates solely to the terms of one or more outstanding series of Preferred Stock if the holders of such affected series are entitled, either separately or together with the holders of one or more other such series, to vote thereon pursuant to this Restated Certificate of Incorporation or any amendment hereto (including any certificate of designations relating to any series of Preferred Stock) or pursuant to the DGCL.

(d)           Liquidation, Dissolution or Winding Up. Upon the dissolution, liquidation or winding up of the Corporation, subject to the rights, if any, of the holders of any outstanding series of Preferred Stock or any class or series of stock having a preference over the right to participate with the Common Stock with respect to the distribution of assets of the Corporation upon such dissolution, liquidation or winding up of the Corporation, the holders of Common Stock, shall be entitled to receive the assets of the Corporation available for distribution to its stockholders ratably in proportion to the number of shares held by such holders.

(e)           Preemptive Rights. Holders of Common Stock shall not have preemptive rights.

Article V

Section 5.1    By-laws. In furtherance and not in limitation of the powers conferred by the DGCL, the Board of Directors is expressly authorized to make, amend, alter and repeal the By-laws of the Corporation without the assent or vote of the stockholders, in any manner not inconsistent with the laws of the State of Delaware or this Restated Certificate of Incorporation. Notwithstanding anything to the contrary contained in this Restated Certificate of Incorporation, unless otherwise required by law, the affirmative vote of the holders of at least a majority of the voting power of all the shares of the Corporation entitled to vote generally in the election of directors, voting together as a single class, shall be required in order for the stockholders of the Corporation to alter, amend or repeal any provision of the By-laws or to adopt any provision inconsistent therewith.

Article VI

Section 6.1    Books and Records. The books and records of the Corporation may be kept (subject to any mandatory requirement of law) outside the State of Delaware at such place or places as may be designated from time to time by the Board of Directors or by the By-laws of the Corporation.

Article VII

Section 7.1    Board of Directors: Composition. The business and affairs of the Corporation shall be managed by or under the direction of a Board of Directors consisting of not less than seven directors or more than fifteen directors, the exact number of directors to be determined from time to time by resolution adopted by affirmative vote of a majority of the Board of Directors. Prior to the 2017 annual meeting of stockholders, the directors shall be and are divided into three classes designated as Class I, Class II and Class III. Each director elected prior to the 2017 annual meeting of stockholders shall serve for the full term to which such director was elected. Following the expiration of the term of (a) the Class I directors in 2017, (b) the Class II directors in 2018 and (c) the Class III directors in 2019, the directors in each such class shall be elected for a term expiring at the succeeding annual meeting of stockholders. Commencing at the 2019 annual meeting of stockholders, all directors shall then be elected at each annual meeting of stockholders for terms expiring at the succeeding annual meeting of stockholders. A director shall hold office until the annual meeting of stockholders for the year in which his or her term expires and until his or her successor shall be elected and qualified, subject, however, to prior death, resignation, retirement, disqualification or removal from office. Elections of directors need not be by written ballot unless the By-laws of the Corporation shall so provide.

Section 7.2    Board of Directors: Vacancies. Any newly created directorship on the Board of Directors that results from an increase in the number of directors and any vacancy occurring on the Board of Directors shall be filled only by a majority of the directors then in office, although less than a quorum, or by a sole remaining director, except, for so long as Blackstone Capital Partners (Cayman) Ltd. 1, Blackstone Capital Partners (Cayman) Ltd. 2, Blackstone Capital Partners (Cayman) Ltd. 3 and their respective affiliates (collectively, “Blackstone”) are the beneficial owners, in the aggregate, of at least 25% in voting power of all shares of capital stock of the Corporation entitled to vote generally in the election of directors, then only the stockholders entitled to vote generally in the election of directors shall be entitled to fill such newly created directorship or vacancy. Any director elected to fill a vacancy not resulting from an increase in the number of directors shall have the same remaining term as that of his or her predecessor.

Section 7.3    Board of Directors: Removal of Directors. Any or all of the directors (other than the directors elected by the holders of any class or classes of Preferred Stock of the Corporation, voting separately as a class or classes, as the case may be) may be removed at any time either with or without cause by the affirmative vote of at least a majority of the voting power of all shares of the Corporation entitled to vote generally in the election of directors, voting as a single class.

Section 7.4    Voting Rights of Preferred Stock.

(a)           Notwithstanding Sections 7.1, 7.2 and 7.3, whenever the holders of any one or more series of Preferred Stock issued by the Corporation shall have the right, voting separately as a series or separately as a class with one or more such other series, to elect directors at an annual or special meeting of stockholders, the election, term of office, removal, filling of vacancies and other features of such directorships shall be governed by the terms of this Restated Certificate of Incorporation (including any certificate of designations relating to any series of Preferred Stock) applicable thereto, and such directors so elected shall not be divided into classes pursuant to this Article VII unless expressly provided by such terms.

(b)           Notwithstanding Section 7.1, during any period when the holders of any series of Preferred Stock have the right to elect additional directors, then upon commencement of the right to elect such directors and for the duration of the period during which such right continues: (i) the then otherwise total authorized number of directors of the Corporation shall automatically be increased by such specified number of directors, and the holders of such Preferred Stock shall be entitled to elect the additional directors provided for in the terms of such Preferred Stock, and (ii) each such additional director shall serve until such director’s successor shall have been duly elected and qualified, or until such director’s right to hold such office terminates pursuant to such terms, whichever occurs earlier, subject to his or her earlier death, disqualification, resignation or removal. Except as otherwise provided by the Board of Directors in the resolution or resolutions establishing such series, whenever the holders of any series of Preferred Stock having such right to elect additional directors are divested of such right pursuant to the provisions of such Preferred Stock, the terms of office of all such additional directors elected by the holders of such Preferred Stock, or elected to fill any vacancies resulting from the death, resignation, disqualification or removal of such additional directors, shall forthwith terminate and the total authorized number of directors of the Corporation shall automatically be reduced accordingly.

Article VIII

Section 8.1    Meetings of Stockholders.

(a)           Any action required or permitted to be taken at any annual or special meeting of stockholders of the Corporation, may be taken without a meeting, without prior notice and without a vote, if a consent or consents in writing, setting forth the action so taken, shall be signed by the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote thereon were present and voted and shall be delivered to the Corporation by delivery to its registered office in the State of Delaware, its principal place of business, or an office or agent of the Corporation having custody of the book in which proceedings of meetings of stockholders are recorded; provided, however if at any time Blackstone no longer is the beneficial owner, in the aggregate, of at least 50.1% in voting power of all shares entitled to vote generally in the election of directors, then any action required or permitted to be taken by the holders of the Common Stock of the Corporation must be effected at a duly called annual or special meeting of such holders and may no longer be effected by any consent in writing by such holders.

(b)           Except as otherwise required by law and subject to the rights of the holders of any series of Preferred Stock, special meetings of the stockholders of the Corporation for any purpose or purposes may be called at any time by the Chairman of the Board, the Board of Directors or a committee of the Board of Directors which has been duly designated by the Board of Directors and whose powers and authority, as provided in a resolution of the Board of Directors or in the By-laws of the Corporation, include the power to call such meetings, but such special meetings may not be called by any other person or persons.

Article IX

Section 9.1    Limitation of Liability. To the fullest extent permitted by the DGCL as the same exists or may hereafter be amended, a director or officer of the Corporation shall not be personally liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director or officer, except for any liability imposed by law (as in effect from time to time) (i) for any breach of the director’s or officer’s duty of loyalty to the Corporation or its stockholders, (ii) for any act or omission not in good faith or which involved intentional misconduct or a knowing violation of law, (iii) of a director under Section 174 of the DGCL, (iv) for any transaction from which the director or officer derived an improper personal benefit or (v) of an officer in any action by or in the right of the Corporation.

Section 9.2    Indemnification of Directors, Officers, Employees or Agents. The Corporation shall, to the fullest extent permitted by the DGCL as the same exists or may hereafter be amended, indemnify its directors and officers where such director or officer is made party or threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal or administrative, by reason of the fact that the person is or was a director or officer of the Corporation. The Corporation may accord to any current or former director, officer, employee or agent of the Corporation the right to, or regulate the manner of providing to any current or former director, officer, employee or agent of the Corporation, indemnification to the fullest extent permitted by the DGCL.

Section 9.3    Adjustments; Amendments. If the DGCL is amended after the date of the filing of this Restated Certificate of Incorporation to authorize corporate action further eliminating or limiting the personal liability of directors or officers or permitting indemnification to a fuller extent, then the liability of a director or officer of the Corporation shall be eliminated or limited, and indemnification shall be extended, in each case to the fullest extent permitted by the DGCL, as so amended from time to time. No repeal or modification of the foregoing provisions of this Article IX by the stockholders shall adversely affect any right or protection of a director of the Corporation existing by virtue of this Article IX at the time of such repeal or modification.

Article X

Section 10.1  Amendment. The Corporation reserves the right to amend or repeal any provision contained in this Restated Certificate of Incorporation in the manner prescribed by the laws of the State of Delaware, as in effect from time to time, and all rights conferred upon stockholders are granted subject to this reservation. Notwithstanding anything contained in this Restated Certificate of Incorporation to the contrary, the affirmative vote of the holders of at least a majority of the voting power of all shares of the Corporation entitled to vote generally in the election of directors, voting together as a single class, shall be required to alter, amend or repeal any provision of this Restated Certificate of Incorporation required to be approved by stockholders under the DGCL. For the avoidance of doubt, but subject to the rights of the holders of any outstanding Preferred Stock, Section 242(d) of the DGCL shall apply to amendments to the Restated Certificate of Incorporation.

Article XI

Section 11.1  Severability. If any provision or provisions of this Restated Certificate of Incorporation shall be held to be invalid, illegal or unenforceable as applied to any circumstance for any reason whatsoever, then, to the fullest extent permitted by applicable law, the validity, legality and enforceability of such provisions in any other circumstance and of the remaining provisions of this Restated Certificate of Incorporation (including, without limitation, each portion of any paragraph of this Restated Certificate of Incorporation containing any such provision held to be invalid, illegal or unenforceable that is not itself held to be invalid, illegal or unenforceable) shall not in any way be affected or impaired thereby.

Article XII

Section 12.1  Competition and Corporate Opportunities.

(a)           In recognition and anticipation that (i) certain directors, principals, officers, employees and/or other representatives of Blackstone Crystal Holdings Capital Partners (Cayman) IV Ltd., Blackstone Capital Partners (Cayman) Ltd. 1, Blackstone Capital Partners (Cayman) Ltd. 2, Blackstone Capital Partners (Cayman) Ltd. 3 and BA Capital Investors Sidecar Fund, L.P. (collectively, the “Original Stockholders”) and their respective Affiliates (as defined below) may serve as directors or officers of the Corporation, (ii) the Original Stockholders and their respective Affiliates may now engage and may continue to engage in the same or similar activities or related lines of business as those in which the Corporation, directly or indirectly, may engage and/or other business activities that overlap with or compete with those in which the Corporation, directly or indirectly, may engage, and (iii) members of the Board of Directors who are not employees of the Corporation (“Non-Employee Directors”) and their respective Affiliates may now engage and may continue to engage in the same or similar activities or related lines of business as those in which the Corporation, directly or indirectly, may engage and/or other business activities that overlap with or compete with those in which the Corporation, directly or indirectly, may engage, the provisions of this Section 12.1 are set forth to regulate and define the conduct of certain affairs of the Corporation with respect to certain classes or categories of business opportunities as they may involve the Original Stockholders, the Non-Employee Directors or their respective Affiliates and the powers, rights, duties and liabilities of the Corporation and its directors, officers and stockholders in connection therewith.

(b)           None of (i) any Original Stockholder or any of its Affiliates or (ii) any Non-Employee Director (including any Non-Employee Director who serves as an officer of the Corporation in both his director and officer capacities) or his or her Affiliates (the Persons (as defined below) identified in (i) and (ii) above being referred to, collectively, as “Identified Persons” and, individually, as an “Identified Person”) shall have any duty to refrain from directly or indirectly (x) engaging in a corporate opportunity in the same or similar business activities or lines of business in which the Corporation or any of its Affiliates now engages or proposes to engage or (y) otherwise competing with the Corporation, and, to the fullest extent permitted by the DGCL, no Identified Person shall be liable to the Corporation or its stockholders for breach of any fiduciary duty solely by reason of the fact that such Identified Person engages in any such activities. The Corporation hereby renounces any interest or expectancy in, or in being offered an opportunity to participate in, any business opportunity which may be a corporate opportunity for an Identified Person and the Corporation or any of its Affiliates, except as provided in paragraph (c) of this Section 12.1. In the event that any Identified Person acquires knowledge of a potential transaction or other business opportunity which may be a corporate opportunity for itself or himself and the Corporation or any of its Affiliates, such Identified Person shall have no duty to communicate or offer such transaction or other business opportunity to the Corporation or any of its Affiliates and, to the fullest extent permitted by the DGCL, shall not be liable to the Corporation or its stockholders for breach of any fiduciary duty as a stockholder, director or officer of the Corporation solely by reason of the fact that such Identified Person pursues or acquires such corporate opportunity for itself or himself, or offers or directs such corporate opportunity to another Person.

(c)           The Corporation does not renounce its interest in any corporate opportunity offered to any Non-Employee Director (including any Non-Employee Director who serves as an officer of this Corporation) if such opportunity is expressly offered to such person solely in his or her capacity as a director or officer of the Corporation and the provisions of Section 12.1(b) shall not apply to any such corporate opportunity.

(d)           In addition to and notwithstanding the foregoing provisions of this Section 12.1, a corporate opportunity shall not be deemed to be a potential corporate opportunity for the Corporation if it is a business opportunity that the Corporation is not permitted to undertake under the terms of Article III or that the Corporation is not financially able or contractually permitted or legally able to undertake, or that is, from its nature, not in the line of the Corporation’s business or is of no practical advantage to it or that is one in which the Corporation has no interest or reasonable expectancy.

(e)           For purposes of this Section 12.1, (i) “Affiliate” shall mean (A) in respect of an Original Stockholder, any Person that, directly or indirectly, is controlled by such Original Stockholder, controls such Original Stockholder or is under common control with such Original Stockholder and shall include any principal, member, director, partner, shareholder, officer, employee or other representative of any of the foregoing (other than the Corporation and any entity that is controlled by the Corporation), (B) in respect of a Non-Employee Director, any Person that, directly or indirectly, is controlled by such Non-Employee Director (other than the Corporation and any entity that is controlled by the Corporation) and (C) in respect of the Corporation, any Person that, directly or indirectly, is controlled by the Corporation; and (ii) “Person” shall mean any individual, corporation, general or limited partnership, limited liability company, joint venture, trust, association or any other entity.

(f)           To the fullest extent permitted by law, any Person purchasing or otherwise acquiring any interest in any shares of capital stock of the Corporation shall be deemed to have notice of and to have consented to the provisions of this Section 12.1.

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IN WITNESS WHEREOF, this Restated Certificate of Incorporation, which only restates and integrates and does not further amend the provisions of the Corporation’s Second Amended and Restated Certificate of Incorporation as heretofore amended or supplemented, there being no discrepancies between those provisions and the provisions of this Restated Certificate of Incorporation, has been duly adopted by the Corporation’s Board of Directors in accordance with Section 245 of the General Corporation Law of the State of Delaware and executed by a duly authorized officer on the date set forth below.