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A kind of preparation method of submicron lignin

A lignin and sub-micron technology, applied in the field of high-quality biomass treatment, can solve the problems of not being well utilized, and achieve the effects of saving energy, improving mechanical properties, and good dispersion

Active Publication Date: 2021-05-07
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of lignin on the earth is second only to cellulose, which can produce 150 billion tons per year. It is a rich renewable carbon resource and non-toxic, but it has not been well utilized so far.

Method used

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  • A kind of preparation method of submicron lignin
  • A kind of preparation method of submicron lignin
  • A kind of preparation method of submicron lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 2L lignin suspension produced by the paper industry, firstly carry out pretreatment, the suspension contains more fine fibers, its size is small, structural form, chemical properties are not uniform, use 300 mesh polypropylene filter cloth to intercept its fine fibers, Obtain lignin black liquor. Ultrasonic treatment of the black liquor for 10 minutes, the ultrasonic power is 28KHz, and then the black liquor is transferred to a glass reactor, mixed and dispersed by double-layer stirring, the lower stirring is a three-blade propulsion stirring paddle, and the upper layer is a stainless steel peripheral tooth shape Dispersion disk, the diameter of the lower stirring paddle and the upper dispersion disk are equivalent, and account for about 0.6-0.7 of the inner diameter of the glass reactor. , the mass fraction of oxalic acid in aqueous oxalic acid solution is 5%). When the pH of the lignin black liquor drops to 8.0, add glycerol with 0.2% of the total mass of lignin...

Embodiment 2

[0036]Take 3L of lignin suspension produced in the paper industry, and use 400-mesh polypropylene filter cloth to intercept its fine fibers to obtain lignin black liquor. Ultrasonic treatment of the black liquor for 10 minutes, ultrasonic power 40KHz, and then the filtered black liquor into a 5L glass reactor, mixed and dispersed with a double-layer stirring paddle, the bottom stirring is a four-blade propulsion stirring paddle, and the upper layer is stainless steel The double-sided tooth dispersing disc, the rotating speed is adjusted to 1000rpm, and it is carried out at room temperature without temperature control, and then the acetic acid aqueous solution is pumped drop by drop (wherein the mass fraction of oxalic acid in the oxalic acid aqueous solution is 25%), when the lignin black After the pH of the liquid drops to 9.0, add polyethylene glycol containing 1% of the total mass of lignin contained in the system as a dispersant, stir for 10 minutes, then quickly add 25% ac...

Embodiment 3

[0039] Take 3L of the lignin suspension produced in the paper industry, and use a 500-mesh polypropylene filter cloth to intercept its fine fibers to obtain lignin black liquor. Ultrasonic treatment of the black liquor for 10 minutes, ultrasonic power 35KHz, and then the filtered black liquor into a 5L glass reactor, mixed and dispersed with a double-layer stirring paddle, the lower layer is a three-blade propulsion type stirring paddle, and the upper layer is stainless steel The single-sided tooth dispersing disc, the rotating speed is adjusted to 1000rpm, and it is carried out at room temperature without temperature control, and then the oxalic acid aqueous solution is pumped drop by drop (wherein the mass fraction of oxalic acid in the oxalic acid aqueous solution is 30%), when the wood After the pH of the plain black liquor drops to 8.5, add glycerol accounting for 0.5% of the total mass of lignin in the system as a dispersant, stir for 10 minutes, then quickly add oxalic a...

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Abstract

The invention discloses a preparation method of submicron lignin, comprising the following steps: (1) filtering lignin suspension to obtain lignin black liquor; (2) adding organic acid and lignin black liquor to the lignin black liquor dispersant to obtain a solid-liquid mixed system; (3) subjecting the solid-liquid mixed system to solid-liquid separation, washing, drying and pulverizing the obtained solid to obtain submicron lignin. The submicron lignin particles prepared by the invention are evenly dispersed and light in color, and have obvious effects in improving the mechanical properties, thermal stability and barrier properties of wood-plastic composite materials.

Description

technical field [0001] The invention belongs to the field of high-quality biomass treatment, and in particular relates to a method for preparing submicron lignin. Background technique [0002] Lignin is an amorphous polymer formed by connecting phenylpropane units through ester bonds and carbon-carbon bonds. There is a methoxy group on the benzene ring, with a C content of about 60% to 66%, and a low hydrogen content. . The structural units are connected by ether bonds or carbon-carbon bonds, and the former is the main connection method. At present, it is believed that there are three basic structures: guaiac wood-based structure, lilac-based structure and p-hydroxyphenyl structure. The amount of lignin on the earth is second only to cellulose, which can produce 150 billion tons per year. It is a rich and non-toxic renewable carbon resource, but it has not been well utilized so far. [0003] The development of submicron lignin provides a new way for the high value-added u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 杨朋朋李晓洁唐成伦李明朱时祥李子涵应汉杰欧阳平凯
Owner NANJING TECH UNIV