Chevron Research Company

Gulf Research & Development Company

Gulf Oil Corporation

Kiran R Bakshi

Edward T Sabourin

Walter P Barie, Jr

David M Marquis

Stephen G Paradis

Anatoli Onopchenko

Adrian D'Souza

A process for the production of tetra- and trialkylsilanes which comprises reacting

Silahydrocarbons from alkylchlorosilanes

A process for the preparation and recovery of m,m'-dinitrobenzophenone and which comprises reacting benzophenone with nitric acid in oleum; adjusting the reaction product to a water content from 12 to 30 weight percent; and extracting the m,m'-dinitrobenzophenone with a chlorinated hydrocarbon solvent.

Isolation of m,m'-dinitrobenzophenone

A one-step solution technique for preparing an aromatic polyimide acid which comprises reacting an aromatic dianhydride with an aromatic diamine in the presence of diglyme and a sufficient amount of a co-solvent to maintain the polyimide acid in solution, said co-solvent having the formula:

Method of preparation of polyimide acids

A one-step solution technique for preparing an aromatic polyimide acid which comprises reacting an aromatic dianhydride with an aromatic diamine in the presence of propylene glycol methyl ether.

Preparation of an aromatic polyimide acid by solution polymerization

A process for recovering maleic anhydride from gaseous compositions comprising maleic anhydride and water by condensing the composition at a temperature in the range of from about 20.degree. C. to about 50.degree. C. and a pressure of less than about 200 millimeters of mercury.

Process for recovering maleic anhydride by condensation

A process for producing maleic anhydride from a C.sub.4 hydrocarbon selected from n-butane and n-butene feed which comprises: (a) feeding the C.sub.4 hydrocarbon and air to a reactor; (b) contacting the C.sub.4 hydrocarbon and air in the reactor with a catalyst comprising vanadium and phosphorus oxides at reaction conditions including a temperature between 550.degree. and 1000.degree. F. so as to obtain a reactor effluent containing maleic anhydride, unreacted butane, nitrogen, oxygen, and acrylic, acetic or maleic acid or mixtures of the foregoing acids; (c) removing maleic anhydride from the reactor effluent to obtain maleic anhydride-lean effluent; (d) removing said acids from at least a portion of the maleic anhydride-lean effluent to obtain a purified recycle stream containing less than 100 ppm of the acids; and (e) recycling the purified stream to the reactor. Preferably the acids are removed in step (d) by water and/or caustic scrubbing the maleic anhydride-lean effluent.

Maleic anhydride production with recycle treatment

A process for producing maleic anhydride from n-butane which comprises:

Maleic anhydride production

The hydrogen fluoride-catalyzed carbonylation of formaldehyde to prepare glycolic acid can be carried out with a significant reduction in by-product formation and at a significantly improved rate by incorporating minor amounts of acetic acid in the reaction medium.

Process for preparing glycolic acid from formaldehyde using acetic acid

The catalytic properties of a complex catalyst comprising vanadium, phosphorus and oxygen which is used for the oxidation of hydrocarbons to maleic anhydride can be partially regenerated by contacting the catalyst with sulfur trioxide.

Growing community of inventors

Murrysville, PA, United States of America

Kiran R Bakshi