Dow Technology Investments LLC

Union Carbide Chemicals & Plastics Technology Corporation

Dow Global Technolgoies LLC

Union Carbide Corporation

Hwaili Soo

Albert C Liu

Paul Victor Hinman

Juliana G Serafin

Madan Mohan Bhasin

Liping L Zhang

Liping Zhang

Thomas Szymanski

Erlind M Thorsteinson

John H Robson

Michael Habenschuss

William H Henstock

Seyed R Seyedmonir

Pen-Yuan Chou

Madan M Bhasin

John Francis Szul

Brian Terry Keen

Ravindra Tupe

Ailene Gardner Phillips

Bernard C Ream

Manuk Colakyan

Balu Shivaji Uphade

John R Mayer

Remi A Trottier

Arun Basrur

David Michael Minahan

Albert Cheng-Yu Liu

Yujun Liu

Albert Liu

James Herndon McCain

Biju M Devassy

Sasanka Raha

Ravindra R Tupe

Manuel A W Natal

Lester K Cantu

David A Spears

Dick A Nagaki

Elbert J Campbell

Joseph C Noronha

Sagar Petkar

Ravindra Radhakisan Tupe

Biju M Divassy

Manuel AW Natal

Arun G Basrur

John Richard Mayer

Remi Andre Trottier

Paul Hinman

Manuel A Natal

A supported silver catalyst and use thereof in a process for producing an alkylene oxide, such as ethylene oxide, by the direct oxidation of an alkylene with oxygen or an oxygen-containing gas, wherein the catalyst provides improved stability and improved resilience to reactor upsets and timely recovery to substantially pre-upset levels of catalyst activity and/or efficiency. In some embodiments, the catalyst also exhibits improved activity. A catalyst capable of producing ethylene oxide at a selectivity of at least 87 percent while achieving a work rate of at least 184 kg/h/mat a temperature of no greater than 235&#xb0; C. when operated in a process where the inlet feed to a reactor containing the catalyst comprises ethylene, oxygen, and carbon dioxide, wherein the concentration of carbon dioxide in the inlet feed is greater than or equal to 2 mole percent.

Alkylene oxide catalyst and use thereof

Methods are provided for producing epoxidation catalysts. The present methods are able to produce catalysts having the desired loading levels of catalytic species at a lower vacuum level (having a higher minimum residual pressure) than previously appreciated by the art, thereby providing equipment cost and time savings.

Methods for producing epoxidation catalysts and epoxidation methods utilizing these

A method of producing an alkylene oxide includes passing a reaction mixture comprising alkylene, oxygen and a gaseous chlorine-containing promoter species over a supported catalyst containing silver and a promoting amount of rhenium to undergo an epoxidation reaction at a first operating condition. The method further includes subsequently performing the epoxidation reaction at a preferred operating condition. The preferred operating condition is characterized by an efficiency of the epoxidation reaction toward the alkylene oxide where the efficiency is lower than that of a maximum efficiency achievable at an operating temperature corresponding to the preferred operating condition.

Epoxidation reactions and operating conditions thereof

Test method for structures, e.g., such as carriers and/or catalysts. The methods may be used to select the carriers and/or catalysts for future use. Carriers and catalysts so selected, and processes making use of these, are also provided.

Methods for testing structures, and selection methods using these

A method for starting-up a high efficiency alkylene oxide catalyst is described. A feed gas comprising an alkylene, oxygen, and at least one organic chloride is introduced to the catalyst. The molar ratio of oxygen to alkylene, reaction temperature, and overall chloriding effectiveness are adjusted to specified ranges of values within a specified catalyst aging period.

Method of starting-up a process of producing an alkylene oxide using a high-efficiency catalyst

A plant and process for producing alkylene oxides to control the production of silver chloride on a high efficiency silver catalyst is disclosed and described. The process involves reacting an alkylene and an organic chloride gas phase promoter with oxygen over the high efficiency silver catalyst. The sulfur concentration in the alkylene oxide reactor feed is controlled to reduce the production of silver chloride which acts as a catalyst poison.

Method of controlling the production of silver chloride on a silver catalyst in the production of alkylene oxides

A process for conditioning a high efficiency silver catalyst used to manufacture ethylene oxide from ethylene, oxygen, and at least one organic chloride is described. A non-reactive conditioning gas comprising at least one of ethylene, oxygen, and a ballast gas is introduced to the catalyst at a conditioning temperature ranging from 150&#xb0; C. to 180&#xb0; C. for a selected period of at least 4 hours.

Process for conditioning a high efficiency ethylene oxide catalyst

A catalyst for the manufacture of alkylene oxide, for example ethylene oxide, by the vapor-phase epoxidation of alkene containing impregnated silver and at least one efficiency-enhancing promoter on an inert, refractory solid support, said support incorporating a sufficient amount of zirconium component (present and remaining substantially as zirconium silicate) as to enhance at least one of catalyst activity, efficiency and stability as compared to a similar catalyst which does not contain the zirconium component.

Catalysts having enhanced stability, efficiency and/or activity for alkylene oxide production

The present invention provides rhenium-promoted epoxidation catalysts based upon shaped porous bodies comprising a minimized percentage of their total pore volume being present in pores having diameters of less than one micron, and a surface area of at least about 1.0 m/g. Processes of making the catalysts and using them in epoxidation processes are also provided.

Epoxidation processes

Rhenium-promoted epoxidation catalysts and methods of making and using them

A simplified method of operating an alkylene oxide production process that utilizes a high efficiency silver catalyst is shown and described. The method accounts for declining catalyst activity that occurs as the catalyst ages by making alternating changes to the reaction temperature and an overall chloriding effectiveness parameter.

Simplified method for producing alkylene oxides with a high efficiency catalyst as it ages

A two-stage, gas phase process for manufacturing alkylene glycol (e.g., ethylene glycol) from an alkene (e.g., ethylene), oxygen and water, the process comprising the steps of:

Two-stage, gas phase process for the manufacture of alkylene glycol

An improved process for the manufacture of ethylene oxide through the epoxidation of ethylene using a catalyst comprising silver and at least one efficiency-enhancing salt of a member of a redox-half reaction pair. Added to the epoxidation reaction is a two-component gas-phase promoter system comprising a chlorine-containing component (for example ethyl chloride, methyl chloride, vinyl chloride and ethylene dichloride), and a nitrogen-containing component of nitric oxide and other compounds capable of generating under reaction conditions at least one gaseous efficiency-enhancing member of a redox-half reaction pair comprising NO, NO, NOor NO. The amount of each component of said gaseous promoter is adjusted to maintain the ration of N* to Z* less than or equal to 1 wherein, N* is the nitric oxide equivalent in ppmv, ranging from 1 to 20 ppmv and Z*=ethyl chloride equivalent (ppmv)*100 percent/ethane equivalent (mol percent)*100 ranging from 5 to 40 ppmv.

Process for the production of alkylene oxide using a gas-phase promoter system

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Charleston, WV, United States of America

Hwaili Soo