Method for preparing biomass polyester

Abstract

The invention discloses a method for preparing biomass polyester, which comprises the following steps of: preparing slurry from terephthalic acid and biomass mixed with polyatomic alcohol according to a molar ratio of 1:1.05 to 1:1.5; then adding the prepared slurry into an esterification reaction kettle to perform the esterification reaction; and finally, performing the condensation polymerization to obtain the biomass polyester, wherein the biomass mixed with the polyatomic alcohol comprises the following components in percentage by weight: 90 to 99.2 percent of ethylene glycol, 0.4 to 5 percent of 1,2-propylene glycol, 0.2 to 2 percent of 1,2-butanediol, 0.1 to 2 percent of pentylene glycol and 0.1 to 1 weight percent of sorbierite. According to the invention, the biomass mixed with the polyatomic alcohol used as a raw material is prepared by a biological fermenting and extracting process and replaces petroleum base ethylene glycol prepared by a conventional method, so that the petroleum using amount and the amount of carbon dioxide discharged outward in the smelting process can be reduced and the phenomenon of shortage of petroleum in China can also be relieved. According to the invention, the design method is reasonable, the energy consumption is reduced, the industrial production is easy to implement and the production cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of biomass polyester, in particular to a preparation method of polyol terephthalate whose raw material is derived from biomass. Background technique [0002] With the development of the global economy, the demand for oil is increasing day by day, while oil resources are dwindling day by day, the contradiction between oil supply and demand is becoming more and more serious, and the war for oil is intensifying. The whole world is working hard to use the inexhaustible biological resources on the earth. Research, exploration, utilization of renewable biomass resources, development of biomass chemical industry, substitution of petrochemical products, and obtaining energy, resources and materials from biomass are the only way to solve the resource and energy crisis and an important way for sustainable development. Therefore, the development of raw materials that can reduce or replace petroleum is a very important...

AI Technical Summary

Problems solved by technology

[0005] In the Chinese patent CN101525424A "Preparation method of polyethylene terephthalate", the content of ethylene glycol in the raw material ethylene glycol is 95% to 99.9%, and the purity requirement of the glycol is relatively high, so the purification is increased difficulty, increased cost

This patent is a preparation method of copolyester fiber, and there is no description of the polymerization process. Secondly, there are defects such as poor flexibility of polyester macromolecular segments, high melting point of polyester, and weak hydrophilicity of polyester.