Abstract: A hydroformylation process wherein the hydrolyzable organophosphorous ligand component of the catalyst is supplied as a stabilized ligand composition comprising a hydrolyzable organophosphorous ligand and, per 100 moles compound, from 0.05 to 13 acid-neutralizing equivalents of an acid scavenger.
Type:
Application
Filed:
April 20, 2015
Publication date:
August 24, 2017
Applicant:
Dow Technology Investments LLC
Inventors:
George R. Phillips, Glenn A. Miller, Marinus A. Bigi, Michael A. Brammer
Abstract: A multi-reaction train hydroformylation process wherein a common product-catalyst separation zone is employed.
Type:
Grant
Filed:
December 9, 2014
Date of Patent:
June 27, 2017
Assignee:
DOW TECHNOLOGY INVESTMENTS LLC
Inventors:
Thomas C. Eisenschmid, Morteza Mokhtarzadeh, Cloid R. Smith, III, Michael C. Becker, George R. Phillips, Michael A. Brammer, Glenn A. Miller, Rick B. Watson, Irvin B. Cox, Edward A. Lord, Martin Smidt
Abstract: A process of controlling hydroformylation reaction fluid temperature involves controlling the flow rate of reaction fluid through an external heat exchanger.
Type:
Grant
Filed:
September 9, 2014
Date of Patent:
June 6, 2017
Assignee:
Dow Technology Investments LLC
Inventors:
Cloid R. Smith, III, Morteza Mokhtarzadeh, Irvin B. Cox
Abstract: Methods of preparing a second high-efficiency, rhenium-promoted silver catalyst for producing alkylene oxide from an alkylene based on a first catalyst are disclosed and described. In accordance with the disclosed methods, the first and second catalysts include at least one promoter that includes a rhenium promoter. The target catalyst concentrations of one or more promoters of the at least one promoter on the second catalyst are determined based on the values of a catalyst reference property for the two catalysts and the concentration of the one or more promoters of the at least one promoter on the first catalyst. Suitable catalyst reference properties include carrier specific surface area and silver specific surface area. Reaction systems utilizing the first and second catalysts are also described.
Type:
Grant
Filed:
November 30, 2012
Date of Patent:
May 16, 2017
Assignee:
Dow Technology Investments LLC
Inventors:
Hirokazu Shibata, Arun G. Basrur, Srikant Gopal, Mark H. McAdon, Albert Cheng-Yu Liu, Liping Zhang, Ernest R. Frank
Abstract: A method for the production of ethylene oxide wherein the partial pressure of water vapor at the inlet of the reactor is at least about 8 kPa using a high purity carrier comprising alpha-alumina, a promoting amount of at least one Group IA metal, and a promoting amount of rhenium.
Type:
Grant
Filed:
March 12, 2014
Date of Patent:
February 21, 2017
Assignee:
Dow Technology Investments LLC
Inventors:
Liping Zhang, Mark H. McAdon, Ernest R. Frank
Abstract: A process for forming a catalyst from a catalytic metal precursor, a chelating bisphosphite and a bulky monophosphite, with a slightly greater than stoichiometric amount of chelating bisphosphite relative to catalytic metal under a CO partial pressure at least 25 psig.
Type:
Grant
Filed:
August 15, 2013
Date of Patent:
January 10, 2017
Assignee:
Dow Technology Investments LLC
Inventors:
Michael A. Brammer, Rick B. Watson, Avery L. Watkins
Abstract: A method for the epoxidation of alkylenes is provided. The method makes use of an epoxidation catalyst comprising a support, silver, manganese and greater than 35 ppm sodium. The catalyst is produced by a method comprising impregnating the support with manganese prior to impregnating the support with sodium and impregnating the support with silver prior to, at the same time as, or after impregnation with manganese. A method for using the alkylene oxides for the production of 1,2-diols, 1,2-carbonates, 1,2-diol ethers is also provided.
Type:
Grant
Filed:
January 11, 2016
Date of Patent:
October 4, 2016
Assignee:
Dow Technology Investments LLC
Inventors:
Srikant Gopal, Lakshmi N. Vutukuru Murthy, Arun G. Basrur
Abstract: The present invention provides processes for purifying a trivalent phosphorous ligand that can be used for the preparation of catalysts for a hydroformylation process. In one embodiment, a process comprises: (A) contacting a trivalent phosphorous ligand, a contaminant metal, a first solvent, a polar complexing agent and a second solvent to form a mixture, (B) obtaining a first phase comprising the ligand and the first solvent, (C) obtaining a second phase comprising the second solvent and at least one complex of the contaminant metal and the polar complexing agent, and (D) separating the two phases prior to preparing a catalyst for use in a hydroformylation reactor.
Abstract: A process of controlling hydroformylation reaction fluid temperature involves controlling the flow rate of reaction fluid through an external heat exchanger.
Abstract: A method for the epoxidation of alkylenes is provided. The method makes use of an epoxidation catalyst comprising a support, silver, manganese and greater than 35 ppm sodium. The catalyst is produced by a method comprising impregnating the support with manganese prior to impregnating the support with sodium and impregnating the support with silver prior to, at the same time as, or after impregnation with manganese. A method for using the alkylene oxides for the production of 1,2-diols, 1,2-carbonates, 1,2-diol ethers is also provided.
Type:
Application
Filed:
January 11, 2016
Publication date:
May 5, 2016
Applicant:
DOW TECHNOLOGY INVESTMENTS LLC
Inventors:
Srikant Gopal, Lakshmi N. Vutukuru Murthy, Arun G. Basrur
Abstract: A process for stabilizing a phosphite ligand against degradation in a hydroformylation reaction fluid, said process comprising adding an epoxide to the reaction fluid, and further comprising separating one or more phosphorus acidic compounds from the reaction fluid by treating the reaction fluid with an aqueous buffer solution under conditions sufficient to neutralize and remove at least some amount of the phosphorus acidic compounds from the reaction fluid.
Type:
Grant
Filed:
September 9, 2013
Date of Patent:
May 3, 2016
Assignee:
Dow Technology Investments LLC
Inventors:
Glenn A. Miller, Thomas C. Eisenschmid, Michael A. Brammer, Rick B. Watson
Abstract: A system and method for the production of oxidized olefins. The system includes two or more reactors having a number of reaction tubes. A catalyst for catalytic oxidation of olefins is on a first side of the number of reaction tubes. A common supply line supplies a mixture comprising olefins and oxygen to the catalyst. Product outlet streams from each reactor are joined to a single product stream. Coolant fluid passing through the reactors flows into a single coolant drum. The single coolant drum supplies the coolant fluid at a common temperature to a number of coolant fluid inlet streams of each reactor.
Abstract: A method for producing epoxidation catalysts is provided. The catalyst comprises a support, a catalytic species, maganese and at least one alkali metal and/or promoter. The catalytic species may be silver. The catalyst is prepared by a method wherein at least a portion of the manganese is impregnated in a step separate from the at least one alkali metal and/or promoter. Advantageously, catalysts produced by the present method may exhibit greater efficiencies than catalysts produced by conventional methods. A method for the epoxidation of alkylenes using the catalysts so produced is provided as is a method for using the alkylene oxides for the production of 1,2-diols, 1,2-carbonates, 1,2-diol ethers, or alka-nolamines.
Type:
Grant
Filed:
May 25, 2012
Date of Patent:
February 16, 2016
Assignee:
Dow Technology Investments LLC
Inventors:
Srikant Gopal, Lakshmi N. Vutukuru Murthy, Arun G. Basrur
Abstract: Methods of reducing or maintaining the value of an alkylene oxide production parameter (such as alkylene oxide production rate) in a process of making an alkylene oxide by reacting an alkylene and oxygen over a high efficiency catalyst are shown and described. One method comprises reducing the concentration of oxygen in the reactor feed gas to reduce or maintain the value of the alkylene oxide production parameter.
Type:
Grant
Filed:
December 6, 2012
Date of Patent:
November 10, 2015
Assignee:
Dow Technology Investments LLC
Inventors:
Liping Zhang, Sasanka Raha, Biju M. Devassy, Balu S. Uphade, Arun G. Basrur, Ailene Gardner Phillips, Ravindra Tupe
Abstract: A process comprising contacting a reaction fluid, which contains at least one phosphorus acidic compound, with a buffer solution to neutralize at least some amount of the phosphorus acidic compound, wherein the buffer solution comprises at least one salt of an unsaturated aliphatic carboxylic acid.
Type:
Grant
Filed:
May 22, 2013
Date of Patent:
November 3, 2015
Assignee:
Dow Technology Investments LLC
Inventors:
Michael A. Brammer, Rick B. Watson, Avery L. Watkins