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. 16, 1999
Filed:
Nov. 05, 1997
Gerhard Darsow, Krefeld, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
Dialkyl maleates can be hydrogenated with hydrogen in a catalytic liquid-phase hydrogenation to give dialkyl succinates, wherein the hydrogenation is carried out continuously at a pressure of from 50 to 400 bar and a reaction temperature of from 30 to 160.degree. C. over a fixed bed of oxygen-free and support-free shaped bodies comprising pressed powders of the elements of the iron subgroup of transition group VIII of the Periodic Table of the Elements (Mendeleev) or their alloys or mixtures with one another with additions of elements of transition groups IV and/or V; hydrogenation-inert elements can additionally be present. The shaped bodies have a compressive strength of from 20 to 220N and an internal surface area of from 10 to 100 m.sup.2 /g.