Method of preparing gamma butyrolactone by 1,4-butanediol dehydrogenation

Abstract

A method for preparing γ-butyrolactone by dehydrogenating 1,4-butanediol, comprising: passing 1,4-butanediol through a reactor under the condition of 170-300°C and 0.1-1MPa in a hydrogen atmosphere, and having the following The above expression for the oxide catalyst contact: CuMn a Al b o c , where a=0.05-1.5, b=0.01-2, and c is the number of oxygen atoms satisfying the requirement that the molecular charge is 0. The catalyst used in the method of the invention does not contain chromium, avoids Cr pollution, and has high catalyst activity and good stability. After 2100 hours of continuous operation, its activity and gamma-butyrolactone selectivity are basically the same as those at the initial stage.

Description

technical field

[0001] The invention relates to a method for preparing gamma-butyrolactone by dehydrogenating 1,4-butanediol. technical background

[0002] γ-butyrolactone is an important organic chemical product. It is an intermediate in the synthesis of butyric acid compounds, polyvinylpyrrolidone, methionine, vitamin B1 and brain rehabilitation. It is a suitable solvent for acrylate and styrene polymers. Can be used as a useful ingredient in paints, detergents and textile auxiliaries.

[0003] Known methods for preparing gamma-butyrolactone are mainly divided into two classes, one is the gas-phase hydrogenation of maleic anhydride or its ester to prepare gamma-butyrolactone, such as US 4,584,419; US 3,853,922; US 3,829,448; CN 1034541A stated. The other is 1,4-butanediol catalytic dehydrogenation to γ-butyrolactone, which will be described below

[0004] related technologies.

[0005] 1, 4-butanediol catalytic dehydrogenation system gamma-butyrolactone, there are two ...