Exhibit 99.1

Celanese Corporation Reports Record Quarterly Results

Raises 2014 Adjusted Earnings Outlook to $5.55 to $5.65 Per Share

Third quarter 2014 financial highlights:

Dallas, October 20, 2014: Celanese Corporation (NYSE: CE), a global technology and specialty materials company, today reported third quarter 2014 adjusted earnings per share of $1.61 versus $1.47 in the prior quarter.

"Celanese generated its highest ever adjusted EPS of $1.61 per share in the third quarter of 2014. We expanded segment income margin to 20.1 percent , a 150 basis point improvement sequentially and a 300 basis point improvement year-over-year. Our excellent results demonstrate the strength of our business model to identify, develop and provide specified materials that add value to our customers and to Celanese. We are also driving strong results in our technology-enabled business through increased flexibility which allows us to benefit from prevailing industry trends," said Mark Rohr, chairman and chief executive officer. "Our earnings drove record adjusted free cash flow in the third quarter. We returned $137 million of cash to shareholders, $39 million toward dividends and $98 million toward share repurchases. With these results, we should end the year with adjusted earnings in the range of $5.55 to $5.65 per share in 2014."

Recent Highlights

Third Quarter Business Segment Overview

Advanced Engineered Materials

In the third quarter, Advanced Engineered Materials generated segment income of $87 million realizing a margin of 23.8 percent , a 40 basis point decrease from the previous quarter. The business' customer-centric approach continues to resonate, providing opportunities to work closely with customers and to develop products and applications that align with their growth strategies. Auto penetration remained consistent with the previous quarter at approximately 2kg per vehicle globally although volume decreased 4 percent from the prior quarter due to the seasonal operations of global auto producers. Pricing decreased 1 percent sequentially driven by mix. The business also completed a major turnaround at the Bishop, Texas facility, and realized earnings from affiliates of $43 million .

Consumer Specialties

Third quarter segment income margin in Consumer Specialties was 39.9 percent , a 290 basis point improvement from the prior quarter, on segment income of $116 million . Segment income increased sequentially mainly due to a production interruption caused by a third party service provider in the second quarter that did not reoccur in the third quarter. Volume increased 1 percent and pricing was consistent with the prior quarter. Dividends from the cellulose derivatives ventures were $29 million , also consistent with the second quarter.

Industrial Specialties

In the third quarter, Industrial Specialties' segment income margin was 4.8 percent on segment income of $15 million . Volume declined 5 percent sequentially primarily due to planned turnaround activity in EVA polymers. Additionally, European demand for emulsion polymers was lower sequentially driven by unseasonably warm weather conditions earlier in the year. Pricing increased 1 percent sequentially primarily in response to higher raw material costs, mainly vinyl acetate monomer ("VAM"), in emulsion polymers.

Acetyl Intermediates

Acetyl Intermediates expanded segment income margin by 170 basis points sequentially to 17.9 percent , on record third quarter segment income of $168 million . Pricing increased 3 percent sequentially, primarily in VAM, reflecting the impact of our own productivity initiatives as well as unplanned industry outages. These results also reflect the business' ability to drive incremental value through our global production network as well as our ability to proactively manage the segment in response to trade flows and prevailing industry trends. Additionally, Celanese's planned turnaround activity had less impact in the third quarter than in the second quarter.

Cash Flow

The company generated operating cash flow of $379 million and adjusted free cash flow of $227 million in the third quarter, which were both records, driven by strong adjusted earnings. Net investment in capital projects was $145 million in the quarter, mainly related to the methanol unit at the company's integrated facility in Clear Lake, Texas and the natural gas boilers at its cellulose derivatives facility in Narrows, Virginia.

The company paid $39 million in dividends and purchased $98 million shares in the quarter which leaves $199 million under the company's share repurchase authorization as of September 30, 2014.

The company ended the quarter with net debt of less than $1.9 billion , $100 million lower than June 30, 2014.

Outlook

"As we look forward to 2015, we are confident that the structural and productivity actions we are taking will help us offset the anticipated methanol headwinds as we move to our own production," said Rohr. "We also expect our customer focused approach for the materials businesses and the commercial actions we will continue to take in our technology-enabled businesses will provide us with appropriate opportunities to offset other anticipated year-over-year headwinds like fewer industry outages, foreign exchange fluctuations and potential weakness in global economies. Adjusted EPS in 2015 that is in the range of our 2014 projections will keep us on track to deliver on our long-term growth objective."

The company's earnings presentation and prepared remarks related to the third quarter results will be posted on its website at www.celanese.com under Investor Relations/Events and Presentations after market close on October 20 , 2014. Information previously included in supplemental tables to our press release is now included in a separate Non-US GAAP Financial Measures and Supplemental Information document posted on our website. See "Reconciliation of Non-US GAAP Financial Measures" below.

Celanese Corporation is a global technology leader in the production of differentiated chemistry solutions and specialty materials used in most major industries and consumer applications. With sales almost equally divided between North America, Europe and Asia, the company uses the full breadth of its global chemistry, technology and business expertise to create value for customers and the corporation. Celanese partners with customers to solve their most critical needs while making a positive impact on its communities and the world. Based in Dallas, Texas, Celanese employs approximately 7,400 employees worldwide and had 2013 net sales of $6.5 billion. For more information about Celanese Corporation and its product offerings, visit www.celanese.com or our blog at www.celaneseblog.com .

Forward-Looking Statements

This release may contain "forward-looking statements," which include information concerning the company's plans, objectives, goals, strategies, future revenues or performance, capital expenditures, financing needs and other information that is not historical information. All forward-looking statements are based upon current expectations and beliefs and various assumptions. There can be no assurance that the company will realize these expectations or that these beliefs will prove correct. There are a number of risks and uncertainties that could cause actual results to differ materially from the results expressed or implied in the forward-looking statements contained in this release. These risks and uncertainties include, among other things: changes in general economic, business, political and regulatory conditions in the countries or regions in which we operate; the length and depth of product and industry business cycles, particularly in the automotive, electrical, textiles, electronics and construction industries; changes in the price and availability of raw materials, particularly changes in the demand for, supply of, and market prices of ethylene, methanol, natural gas, wood pulp and fuel oil and the prices for electricity and other energy sources; the

ability to pass increases in raw material prices on to customers or otherwise improve margins through price increases; the ability to maintain plant utilization rates and to implement planned capacity additions and expansions; the ability to reduce or maintain their current levels of production costs and to improve productivity by implementing technological improvements to existing plants; increased price competition and the introduction of competing products by other companies; market acceptance of our technology; the ability to obtain governmental approvals and to construct facilities on terms and schedules acceptable to the company; changes in the degree of intellectual property and other legal protection afforded to our products or technologies, or the theft of such intellectual property; compliance and other costs and potential disruption or interruption of production or operations due to accidents, interruptions in sources of raw materials, cyber security incidents, terrorism or political unrest or other unforeseen events or delays in construction or operation of facilities, including as a result of geopolitical conditions, the occurrence of acts of war or terrorist incidents or as a result of weather or natural disasters; potential liability for remedial actions and increased costs under existing or future environmental regulations, including those relating to climate change; potential liability resulting from pending or future litigation, or from changes in the laws, regulations or policies of governments or other governmental activities in the countries in which we operate; changes in currency exchange rates and interest rates; our level of indebtedness, which could diminish our ability to raise additional capital to fund operations or limit our ability to react to changes in the economy or the chemicals industry; and various other factors discussed from time to time in the company's filings with the Securities and Exchange Commission. Any forward-looking statement speaks only as of the date on which it is made, and the company undertakes no obligation to update any forward-looking statements to reflect events or circumstances after the date on which it is made or to reflect the occurrence of anticipated or unanticipated events or circumstances.

Non-GAAP Financial Measures

Use of Non-US GAAP Financial Information

This release uses the following non-US GAAP measures: adjusted EBIT, operating EBITDA, adjusted earnings per share, adjusted free cash flow and net debt. These measures are not recognized in accordance with US GAAP and should not be viewed as an alternative to US GAAP measures of performance. The most directly comparable financial measure presented in accordance with US GAAP in our consolidated financial statements for adjusted EBIT and operating EBITDA is net earnings (loss); for adjusted earnings per share is earnings (loss) from continuing operations per common share-diluted; for adjusted free cash flow is cash flow from operations; and for net debt is total debt.

Definitions of Non-US GAAP Financial Measures

Note: The income tax rate used for adjusted earnings per share approximates the midpoint in a range of forecasted tax rates for the year. This range may include certain partial or full-year forecasted tax opportunities, where applicable, and specifically excludes changes in uncertain tax positions, discrete items and other material items adjusted out of our GAAP earnings for adjusted earnings per share purposes, and changes in management's assessments regarding the ability to realize deferred tax assets. We also reflect the impact of foreign tax credits when utilized for the adjusted earnings per share tax rate. We analyze this rate quarterly and adjust if there is a material change in the range of forecasted tax rates; an updated forecast would not necessarily result in a change to our tax rate used for adjusted earnings per share. The adjusted tax rate is an estimate and may differ from the actual tax rate used for GAAP reporting in any given reporting period. It is not practical to reconcile our prospective adjusted tax rate to the actual GAAP tax rate in any given future period.

Reconciliation of Non-US GAAP Financial Measures

Reconciliations of the non-US GAAP financial measures used in this press release to the comparable US GAAP financial measure, together with information about the purposes and uses of non-US GAAP financial measures, are included in our Non-US GAAP Financial Measures and Supplemental Information document filed as an exhibit to our Current Report on Form 8-K filed with the SEC on or about October 20, 2014 and also available on our website at www.celanese.com under Financial Information, Non-GAAP Financial Measures, or at this link: http://investors.celanese.com/interactive/lookandfeel/4103411/Non-GAAP.PDF

Results Unaudited

The results in this document, together with the adjustments made to present the results on a comparable basis, have not been audited and are based on internal financial data furnished to management. Quarterly results should not be taken as an indication of the results of operations to be reported for any subsequent period or for the full fiscal year.

Supplemental Information

Additional information about our prior period performance is included in our Quarterly Reports on Form 10-Q and in our Non-US GAAP Financial Measures and Supplemental Information document.

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Non-US GAAP Financial Measures and Supplemental Information

October 20, 2014

In this document, the terms "Company," "we" and "our" refer to Celanese Corporation and its subsidiaries on a consolidated basis.

Purpose

The purpose of this document is to provide information of interest to investors, analysts and other parties including supplemental financial information and reconciliations and other information concerning our use of non-US GAAP financial measures. This document is updated quarterly.

Use of Non-US GAAP Financial Measures

From time to time, management may publicly disclose certain numerical "non-GAAP financial measures" in the course of our earnings releases, financial presentations, earnings conference calls, investor and analyst meetings and otherwise. For these purposes, the Securities and Exchange Commission ("SEC") defines a "non-GAAP financial measure" as a numerical measure of historical or future financial performance, financial position, or cash flows that excludes amounts, or is subject to adjustments that effectively exclude amounts, included in the most directly comparable measure calculated and presented in accordance with US GAAP, and vice versa for measures that include amounts, or are subject to adjustments that effectively include amounts, that are excluded from the most directly comparable US GAAP measure so calculated and presented. For these purposes, "GAAP" refers to generally accepted accounting principles in the United States.

Non-GAAP financial measures disclosed by management are provided as additional information to investors, analysts and other parties as the Company believes them to be important supplemental measures for assessing our financial and operating results and as a means to evaluate period-to-period comparisons. These non-GAAP financial measures should be viewed as supplemental to, and should not be considered in isolation or as alternatives to, net earnings (loss), operating profit (loss), cash flow from operating activities, earnings per share or any other US GAAP financial measure. The method of calculation of the non-GAAP financial measures used herein may be different from other companies' methods for calculating measures with the same or similar titles. Investors, analysts and other parties should understand how another company calculates such non-GAAP financial measures before comparing the other company's non-GAAP financial measures to any of our own. These non-GAAP financial measures may not be indicative of the historical operating results of the Company nor are they intended to be predictive or projections of future results.

Pursuant to the requirements of SEC Regulation G, whenever we refer to a non-GAAP financial measure, we will also present on the Investor Relations/Financial Information/Non-GAAP Financial Measures page of our website, www.celanese.com, in this document, in the presentation itself or on a Form 8-K in connection with the presentation, to the extent practicable, the most directly comparable financial measure calculated and presented in accordance with GAAP, along with a reconciliation of the differences between the non-GAAP financial measure we reference and such comparable GAAP financial measure. This supplemental financial disclosure should be considered within the context of our complete audited financial results for the given period, which are available on the Investor Relations/Financial Information/SEC Filings page of our website, www.celanese.com.

This document includes definitions and reconciliations of non-GAAP financial measures used from time to time by the Company.

Specific Measures Used

This document provides information about the following non-GAAP measures: adjusted EBIT, operating EBITDA, adjusted earnings per share, net debt, adjusted free cash flow and return on capital employed. The most directly comparable financial measure presented in accordance with US GAAP in our consolidated financial statements for adjusted EBIT and operating EBITDA is net earnings (loss); for adjusted earnings per share is earnings (loss) from continuing operations per common share-diluted; for net debt is total debt; and for adjusted free cash flow is cash flow from operations. We do not believe that there is a directly comparable financial measure calculated and presented in accordance with GAAP for return on capital employed.

Definitions

limitations because of the excluded items. Adjusted EBIT is one of the measures management uses for planning and budgeting, monitoring and evaluating financial and operating results and as a performance metric in the Company's incentive compensation plan. We may provide guidance on adjusted EBIT but are unable to reconcile forecasted adjusted EBIT to a US GAAP financial measure without unreasonable effort because a forecast of certain items is not practical. Adjusted EBIT by business segment may also be referred to by management as segment income.

Note: The income tax rate used for adjusted earnings per share approximates the midpoint in a range of forecasted tax rates for the year. This range may include certain partial or full-year forecasted tax opportunities, where applicable, and specifically excludes changes in uncertain tax positions, discrete items and other material items adjusted out of our GAAP earnings for adjusted earnings per share purposes, and changes in management's assessments regarding the ability to realize deferred tax assets. We also reflect the impact of foreign tax credits when utilized for the adjusted earnings per share tax rate. We analyze this rate quarterly and adjust if there is a material change in the range of forecasted tax rates; an updated forecast would not necessarily result in a change to our tax rate used for adjusted earnings per share. The adjusted tax rate is an estimate and may differ from the actual tax rate used for GAAP reporting in any given reporting period. It is not practical to reconcile our prospective adjusted tax rate to the actual GAAP tax rate in any given future period.

Supplemental Information

Supplemental Information we believe to be of interest to investors, analysts and other parties includes the following:

Results Unaudited

The results in this document, together with the adjustments made to present the results on a comparable basis, have not been audited and are based on internal financial data furnished to management. Quarterly results should not be taken as an indication of the results of operations to be reported for any subsequent period or for the full fiscal year.

Change in accounting policy regarding pension and other postretirement benefits

Effective January 1, 2013, we elected to change our policy to immediately recognize actuarial gains and losses and the change in fair value of plan assets for our defined benefit pension plans and other postretirement benefit plans. Financial information for prior periods has been retrospectively adjusted.