Preparation of levulinate from glucose by molecular screen catalytic hydrolysis

Abstract

Production of acetylpropionic acid by molecular sieve catalytic hydrolyzing glucose is carried out by: 1) calcining molecular sieve catalyst at 500-900deg.C; 2) adding calcined molecular sieve catalyst and glucose solution with concentration 5-100g / L into closed high-pressure reactor with weight ratio of glucose and catalyst 6-0.5; 3) inducing nitrogen into reactor, discharging air from reactor, raising temperature to 120-220deg.C, and reacting for 2-20hrs at 0.1-2Mpa. Its advantages include moderate reaction, high catalyst activity, no corrosion, and easy separation of catalyst, material and product.

Description

technical field

[0001] The invention relates to a method for preparing levulinic acid, in particular to a method for preparing levulinic acid by catalytically hydrolyzing glucose with molecular sieves. Background technique

[0002] Levulinic acid, also known as 4-oxopentanoic acid, levulonic acid or penteroic acid, is a widely used chemical raw material, which can be processed through esterification, halogenation, hydrogenation, oxidative dehydrogenation, condensation and other chemical reactions Preparation of various products; its 4-position carbonyl is a latent chiral group, which can obtain chiral compounds through asymmetric reduction; meanwhile, levulinic acid is also an intermediate of pesticides and fuels. Therefore it is expected to be a new platform compound.

[0003] At present, there are two methods for producing levulinic acid: catalytic hydrolysis of furfuryl alcohol and direct hydrolysis of biomass. Among them, the direct biomass hydrolysis method directly u...