PROCESS FOR THE PREPARATION OF GAMMA-BUTYROLACTONE

摘要

In a process for the preparation of gamma -butyrolactone by catalytically dehydrogenating 1,4-butanediol in a gaseous phase in the presence of a catalyst, reaction is carried out in the presence of a catalyst containing copper and chromium and in the presence of hydrogen, and gamma -butyrolactone is separated from a reaction mixture and the residual part is recycled as such in a feed. The activity, selectivity or life of the catalyst is not adversely affected by recycled impurities, and some of impurities are decomposed by the catalyst.