Method for preparing butyl acetate by using molecular sieve immobilized catalyst

Abstract

The invention belongs to the field of chemical synthesis processes, and particularly relates to a method for preparing n-butyl acetate from a molecular sieve immobilized catalyst. Butanol, acetic acid and water are added to an esterification reaction still according to the proportion of (2-5 L):1L:3L, the molecular sieve immobilized catalyst accounting for 5% to 30% of the total proportion of the volume of the reaction system is added, reacting is carried out for 15 min to 30 min at the temperature of 80 DEG C to 115 DEG C, then condensation is carried out, and n-butyl acetate is obtained through rectification and recovery. N-butyl acetate is prepared through the catalytic action of the molecular sieve immobilized catalyst, the acetic acid conversion rate reaches 98% or above, the yield of n-butyl acetate is 99.5% or above, and the obtained esterification product is high in purity; the molecular sieve immobilized catalyst can be reused 6-8 times, so that the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of chemical synthesis technology, and in particular relates to a method for preparing butyl acetate by using a molecular sieve immobilized catalyst. The immobilized catalyst uses molecular sieve as a carrier and heteropolyacid as a catalytic active layer. Background technique [0002] Butyl acetate is an excellent organic solvent, and it has good solubility properties for ethyl cellulose, cellulose acetate butyrate, polystyrene, methacrylic resin, chlorinated rubber and various natural gums. [0003] In the traditional process, butyl acetate is obtained by esterification of acetic acid and n-butanol in the presence of sulfuric acid. Butanol, acetic acid and sulfuric acid are put into the distillation pot in proportion, and esterified at 120 degrees Celsius. After reflux dehydration, the esterification is controlled. The acid value at the time of melting is below 0.5, and the obtained crude ester is neutralized and put...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is to overcome the strong corrosiveness brought by the existing catalyst, serious environmental pollution, tedious preparation process, non-targeted product use, and the current production method of butyl acetate product to obtain low product conversion rate and low product reaction. Incomplete, the purity of the obtained butyl acetate product is not high, and a simple and easy-to-implement method for preparing butyl acetate using a molecular sieve immobilized catalyst is provided. The immobilized catalyst uses molecular sieve as a carrier and heteropolyacid as a catalytic active layer.