Dual catalytic system for promoting ammonium lactate esterification and uses, preparation method of maganetic solid acid catalyst in the same

Abstract

The invention relates binary catalysis system and its application in ammonlum lactate esterification reaction, and the method for preparation of magnetism solid acid catalyst in the said catalysis system. It solves the problem of magnetism solid acid catalyst not suiting ammonlum lactate esterification. In the invention the binary catalysis system comprises the magnetism solid acid catalyst and tin dichloride, the proportion by weight of which is 20: 1-1: 20. The method for making magnetism solid acid catalyst comprises the following steps: 1. adding ammonia into ferric persulfate solution; 2. solid-liquid separation, drying and powdering the solid; 3.adding the powder into the nickel sulfate solution; 4. evaporating to dryness and roasting; 5. cooling. The said catalysis system is used in ammonlum lactate esterification reaction, comprising the following proportion: a. the mass ratio of ammonium lactate and the C1-C4 alcohol being 10í†1-1í†10; b. the weight ratio of catalysis system and ammonium lactate being 0.005-5úÑ, and the magnetism solid acid catalyst and tin dichloride being 20í†1-1í†20; c. the esterification reaction reacting in atmosphere pressure, at 115-140íµ, for 3.5-11h. The invention has good selectivity, adapted for ammonlum lactate esterification reaction.

Description

technical field [0001] The invention relates to a binary catalytic system. The present invention also relates to the application of the above catalyst system in the esterification reaction of ammonium lactate. The invention also relates to a preparation method of the magnetic solid acid catalyst in the above catalyst system. Background technique [0002] Invention patents CN1453067A and CN1290574A respectively disclose a method for preparing a magnetic solid acid catalyst, but these methods all need to prepare a magnetic substance as a catalyst nucleus first, and the preparation steps of the catalyst are cumbersome, and the prepared catalyst is relatively acidic, which is harmful to the esterification of ammonium lactate. The selectivity of the reaction is poor. Contents of the invention [0003] The purpose of the present invention is to solve the problem that in the lactic acid esterification reaction in the past, the catalyst needs to prepare a magnetic substance as t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that in the lactic acid esterification reaction in the past, the catalyst needs to prepare a magnetic substance as the catalyst nucleus, the preparation steps of the catalyst are loaded down with trivial details, and the prepared catalyst is relatively acidic, which is not suitable for the esterification reaction of ammonium lactate. Provided is a binary catalytic system for promoting the esterification of ammonium lactate and its application and the preparation method of the magnetic solid acid catalyst in the system