Hydrogenation with cu-al catalysts

Details Hydrogenation with cu-al catalysts Hydrogenation with cu-al catalysts

B - Operations, Transporting

01

J

252/68, 260/637.

B01J 23/72 (2006.01) C07C 29/141 (2006.01) C07C 29/149 (2006.01)

Patent

CA 2032871

HYDROGENATION WITH Cu-Al CATALYSTS FIELD OF THE INVENTION The invention relates to a process for the catalytic vapor phase hydrogenation of bound oxygen-containing organic compounds and particularly to the catalytic hydrogenation of esters. DESCRIPTION OF RELATED TECHNOLOGY The hydrogenation of, for example, mono-esters normally yields alcohols according to a simple relationship: RC(O)OR' + 2H2?R'OH + RCH2OH The hydrogenation of diesters generally results in a more com- plicated product mixture. For example, the hydrogenation of a dialkyl maleate typically results in the formation of several products, the amount of each depending on the reaction conditions: ROC(O)CH=CHC(O)OR + xH2?2ROH + 1,4-Butanediol + Tetrahydrofuran + gamma-Butyrolactone The concentrations of each of the products are a function of the equilibrium reaction conditions, e.g. temperature, pressure, liquid hourly space velocity (LHSV), and gas hourly space velocity (GHSV) of the process. Like most hydrogenation reactions, the processes are usually catalyzed and are affected strongly by the composition of the catalyst used in the process. Typical hydrogenation catalysts for esters are a combination of reduced copper and zinc (GB 2,150,560 and WO 83/03409) or reduced copper-chromite (U.S. 2,100,483; 3,767,595; and 4,584,419). Various promoters can be added as dis- closed in U.S. Patent No. 2,109,844 (barium or cadmium). Patent Nos. 2,297,769; 4,209,424; 4,593,015; and 4,600,704 and EP 0143,634 discuss particular reduction activation processes - for copper-based catalysts.

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