LIMITED POWER OF ATTORNEY                                       Exhibit 24

Know all by these presents that the undersigned hereby makes, constitutes
and appoints Peter G. Edwards, James R. Peacock III, and Adam R.
Santosuosso, signing singly, as the undersigned's true and lawful
attorney-in-fact, with full power and authority as hereinafter described on
behalf of and in the name, place and stead of the undersigned to:

(1) prepare, execute in the undersigned's name and on the undersigned's
behalf, and submit to the U.S. Securities and Exchange Commission
("SEC") a Form ID, including amendments thereto, and any other
documents necessary or appropriate to obtain codes and passwords
enabling the undersigned to make electronic filings with the SEC of
reports required by Section 16(a) of the Securities Exchange Act of 1934,
as amended (the "Exchange Act") or any rules or regulations of the SEC;

(2) prepare, execute, acknowledge, deliver and file Forms 3, 4, and 5 and
Forms 144 (including any amendments thereto) and any other forms or
reports required with respect to the securities of Celanese Corporation, a
Delaware corporation (the "Company"), with the United States Securities
and Exchange Commission and any national securities exchanges, as
considered necessary or advisable under Section 16(a) of the Exchange
Act or similar provisions of securities laws;

(3) seek or obtain, as the undersigned's representative and on the
undersigned's behalf, information on transactions in the Company's
securities from any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any
such person to release any such information to the undersigned and
approves and ratifies any such release of information; and

(4) perform any and all other acts which in the discretion of such
attorney-in-fact are necessary or desirable for and on behalf of the
undersigned in connection with the foregoing.

The undersigned acknowledges that:

(1) this Power of Attorney authorizes, but does not require, such attorney-
in-fact to act in his or her discretion on information provided to such
attorney-in-fact without independent verification of such information;

(2) any documents prepared and/or executed by such attorney-in-fact on behalf
of the undersigned pursuant to this Power of Attorney will be in such form
and will contain such information and disclosure as such attorney-in-fact, in
his or her discretion, deems necessary or desirable;

(3) neither Celanese nor such attorneys-in-fact assumes

(i) any liability for the undersigned's responsibility to comply with the
requirements of the Exchange Act,

(ii) any liability of the undersigned for any failure to comply with such
requirements, or

(iii) any obligation or liability of the undersigned for profit disgorgement
under Section 16(b) of the Exchange Act; and

(4) this Power of Attorney does not relieve the undersigned from responsibility
for compliance with the undersigned's obligations under the Exchange Act,
including without limitation the reporting requirements under Section 16 of
the Exchange Act.

The undersigned hereby gives and grants each foregoing attorney-in-fact full
power and authority to do and perform any and every act and thing whatsoever
requisite, necessary or appropriate to be done in and about the foregoing
matters as fully to all intents and purposes as the undersigned might or could
do if present, hereby ratifying all that such attorney-in-fact, for and on
behalf of the undersigned, will lawfully do or cause to be done by virtue of
this Power of Attorney.

This Power of Attorney will remain in full force and effect until the
undersigned is no longer required to file the forms noted above with respect
to the undersigned's holdings of and transactions in the Company's securities,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of the date set forth below.

/s/ Benita M. Casey
Signature

Name: Benita M. Casey

Dated: February 15, 2018