公开(公告)号：US3904652A

公开(公告)日：1975-09-09

申请号：US30703872

申请日：1972-11-16

Applicant: STANDARD OIL CO INDIANA

Inventor： FRANK MARSHALL E

IPC: C07D307/60 ,  B01J27/00 ,  B01J31/00 ,  B01J31/18 ,  B01J31/22 ,  B01J31/26 ,  C07B61/00 ,  C07C51/215

CPC classification number: B01J31/2226 ,  B01J31/1845 ,  B01J31/26 ,  B01J2531/56 ,  C07C51/215 ,  C07C57/145

Abstract: In the oxidation of butane to form maleic anhydride over a phosphorus-vanadium-oxygen complex catalyst, improved yields and processing advantages are obtained by using low oxygen concentrations and recycling the off-gas from the scrubbing operation.