Method for preparing lignin polyether polyols

Abstract

The invention relates to a method for preparing lignin polyether polyols. The method comprises the following steps: (1) adding the following raw materials into a reactor in parts by weight: 30-120 parts of alkali lignin, 20-150 parts of water, 0.5-10 parts of cellulase, 0.5-3 parts of sodium hydroxide, 0.1-50 parts of furfuryl alcohol and 1-15 parts of furfural; raising the temperature of the reactor to be 30-65 DEG C, stirring for 2-6 hours, and preparing enzymatic hydrolysis modified alkali lignin; (2) adding the enzymatic hydrolysis modified alkali lignin prepared in the step (1), liquid-state polyhydric alcohols, a bimetallic catalyst, diethylene glycol and glycerol into the reactor in parts by weight, stirring and raising the temperature to be 80-120 DEG C, introducing a small amount of nitrogen into the bottom of the reactor for carrying out bubbling reaction, vacuumizing, adding 0.01-12 parts of epoxypropane into the reactor, reacting in a closed mode for 1-6 hours under normal pressure, and preparing the lignin polyether polyols. The method for preparing the lignin polyether polyols is simple in steps, byproducts can be reasonably and deeply processed by utilizing corn, and the prepared lignin polyether polyols are stable in physical properties, can serve as novel foam materials and are difficult to deform.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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AI Technical Summary

Problems solved by technology

[0002] At present, alcohols such as ethylene glycol, propylene glycol, and butanol are mainly prepared from corn, and the by-products produced during the preparation process cannot be rationally utilized, such as the corn sugar residue and corn alcohol residue produced, whether it is Liq