The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 1995
Filed:
Dec. 10, 1993
David C Molzahn, Midland, MI (US);
Mark E Jones, Midland, MI (US);
George E Hartwell, Midland, MI (US);
Jose Puga, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A process for the production of dialkyl carbonates, such as dimethyl carbonate. In one aspect, the process involves contacting under reaction conditions an alkanol, such as methanol, with carbon monoxide and oxygen in the vapor phase and in the presence of a catalyst containing (1) a copper halide, a copper oxyhalide, or a copper carboxylate halide, (2) a quaternary ammonium salt, and (3) a support component. The catalyst achieves high selectivity and productivity to dialkyl carbonates. In a second aspect, the addition of a chlorocarbon catalyst regenerator to the alkanol feed increases catalyst stability and lifetime and increases the selectivity and/or productivity to dialkyl carbonates.