申请人:BASF Aktiengesellschaft
公开号:US06350924B1
公开(公告)日:2002-02-26
A process for preparing 1,4-butanediol and, if desired, &ggr;-butyrolactone and THF by oxidizing butane or benzene to form a product stream including maleic anhydride, absorbing maleic anhydride from the product stream with a high-boiling inert solvent in an absorption stage to give a liquid absorption product, esterifying the liquid absorption product with a C1-C5 esterifying alcohol in an esterification stage to form an esterification product comprising the corresponding diester and high-boiling inert solvent, then hydrogenating the esterification product to give a hydrogenation product which comprises the products of value, 1,4-butanediol and, if desired, &ggr;-butyrolactone and tetrahydrofuran and the esterifying alcohol and which is separated by distillation into the products of value and the esterifying alcohol, and recycling the esterifying alcohol to the esterification zone, which comprises separating the esterification product into the diester and the inert solvent by distillation under reduced pressure prior to the hydrogenation, recycling the inert solvent to the absorption stage, and hydrogenating the diester in the liquid phase over a fixed-bed catalyst.
一种制备1,4-丁二醇,如有需要还包括γ-丁内酯和THF的方法,通过氧化丁烷或苯生成包括马来酸酐的产品流,用高沸点惰性溶剂在吸收阶段从产品流中吸收马来酸酐,得到液体吸收产物,将液体吸收产物与C1-C5酯化醇在酯化阶段酯化,形成包括相应二酯和高沸点惰性溶剂的酯化产物,然后加氢酯化产物,得到包括有价值产品1,4-丁二醇,如有需要还包括γ-丁内酯和四氢呋喃和酯化醇的加氢产物,通过蒸馏分离为有价值产品和酯化醇,将酯化醇回收到酯化区域,其中包括在加氢之前通过减压蒸馏将酯化产物分离为二酯和惰性溶剂,将惰性溶剂回收到吸收阶段,液相中在固定床催化剂上加氢二酯。