Method and device for preparing rosin ester by coupling catalytic esterification and separation

Abstract

The invention relates to a method for preparing rosin ester by coupling catalytic esterification and separation, which comprises the following operation steps: (1) mixing an alcohol compound, a rosin and a solvent, and dissolving; (2) putting the dissolved substance in the step (1) into an esterification reactor, and introducing 0.01-10.0-MPa CO2 to perform esterification reaction at 150-300 DEG C; (3) recovering the gas phase in the esterification reaction process, sending the gas phase into a gas-liquid separator through an expander, and returning the separated CO2 and newly supplemented CO2 into the esterification reactor through a turbine compressor; and (4) after reacting in the esterification reactor for 1.0-8.0 hours, relieving the pressure, and taking the obtained product out of the esterification reactor. The invention aims to provide a preparation method which has the advantages of lower cost and high rosin ester quality.

Description

technical field [0001] The invention belongs to the technical field of rosin deep processing, and relates to a method and equipment for preparing rosin ester through catalytic esterification-separation coupling. Background technique [0002] Rosin ester is the most important species in rosin deep processing, accounting for more than 60% of rosin deep processing products. Because rosin resin acid has a three-ring phenanthrene skeleton structure, the steric hindrance of the carboxyl group is large, resulting in high activation energy of the esterification reaction, and the viscosity of the rosin reaction system is high, resulting in difficulty in interphase transfer between reactants. The esterification reaction of rosin resin acid can only be carried out under the conditions of acidic metal oxide catalyst and high temperature. However, under high temperature conditions, the rosin resin acid is prone to decarboxylation side reactions, resulting in a reduction in the esterific...

AI Technical Summary

Problems solved by technology

[0003] In the current technology, in the technology of preparing rosin esters after deep processing of rosin with catalysts, most of the catalysts use metal catalysts to esterify rosin to obtain rosin esters, but the use of metal catalysts for catalysis will cause metal ions to pollute rosin esters. If rosin ester contaminated by metal ions is used for food production, it will have adverse effects on the human body after use

Moreover, the preparation of rosin esters in the present technology is due to the use of metal catalysts, and sometimes even noble metal catalysts are used for catalytic reaction production, resulting in problems such as higher production costs, making the profit not high in the process of producing rosin esters

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