Method for preparing lignin in use of corncob residues as raw materials

A technology of lignin and xylose residue, which is applied in the chemical industry, can solve the problems of structural damage of lignin products, low added value of xylose residue, and low utilization rate of raw materials, so as to save steam consumption, improve competitiveness, and stabilize product quality Effect

Inactive Publication Date: 2015-06-10
FUTASTE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for preparing lignin from xylose residues, which is used to solve the problems of low raw material utilization, high energy consumption, high water consumption, Serious environmental pollution, serious structural damage to lignin products, poor product quality and low added value of xylose residues, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Alkali soluble

[0030] Take 100g of xylose residue on a dry basis, add 500g of sodium hydroxide solution with a mass percentage concentration of 3% according to the ratio of its dry matter mass of 1:5, mix evenly, and heat and stir at a temperature of 60°C for 4 hours to make the xylose residue The lignin in the solution fully reacts with the alkali to form alkali lignin and dissolves in the solution.

[0031] 2. Plate and frame filter

[0032] The lignin solution was separated from the cellulose by using a plate and frame filter, and the controlled plate and frame filter press pressure was 0.5 MPa to obtain 450 g of lignin alkaline solution with a dry matter concentration of 5% and an alkalinity of 0.85%.

[0033] 3. Microfiltration and impurity removal

[0034] A 0.2um microfiltration membrane is used to remove suspended impurities in the lignin solution to obtain a clear lignin solution.

[0035] 4. Concentration by nanofiltration

[0036] The alkali-resistan...

Embodiment 2

[0040] 1. Alkali soluble

[0041] Take 100g of xylose residue on a dry basis, add 1000g of sodium hydroxide solution with a mass percentage concentration of 1.5% according to the ratio of its dry matter mass of 1:10, mix evenly, and insulate and stir at a temperature of 100°C for 2 hours to make the xylose residue The lignin in the solution fully reacts with the alkali to form alkali lignin and dissolves in the solution.

[0042] 2. Plate and frame filter

[0043] The lignin solution was separated from the cellulose by using a plate and frame filter, and the controlled plate and frame filter press pressure was 0.5 MPa to obtain 950 g of lignin alkaline solution with a dry matter concentration of 2.5% and an alkalinity of 0.15%.

[0044] 3. Microfiltration to remove impurities

[0045] A 0.2um microfiltration membrane is used to remove suspended impurities in the lignin solution to obtain a clear lignin solution.

[0046] 4. Concentration by nanofiltration

[0047]The alkal...

Embodiment 3

[0051] 1. Alkali soluble

[0052] Take 100g of xylose residue on a dry basis, add 800g of sodium hydroxide solution with a mass percentage concentration of 2.5% according to the ratio of its dry matter mass of 1:8, mix evenly, and insulate and stir at a temperature of 80°C for 3 hours to make the xylose residue The lignin in the solution fully reacts with the alkali to form alkali lignin and dissolves in the solution.

[0053] 2. Plate and frame filter

[0054] A plate and frame filter was used to separate the lignin liquid from the cellulose, and the controlled plate and frame filter press pressure was 0.5 MPa to obtain 750 g of lignin alkaline solution with a dry matter concentration of 3.5% and an alkalinity of 0.35%.

[0055] 3. Microfiltration and impurity removal

[0056] A 0.2um microfiltration membrane is used to remove suspended impurities in the lignin solution to obtain a clear lignin solution.

[0057] 4. Concentration by nanofiltration

[0058] The alkali-resi...

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Abstract

The invention provides a method for preparing lignin in use of corncob residues as raw materials; corncob residues of leftovers in xylose production are adopted as the raw materials and subjected to the processes such as alkaline liquid soaking reaction, nanofiltration and concentration, spray drying or acidification filtration to prepare alkaline lignin products or acidic lignin products; the production process is simple and the product quality is stable. The preparation method solves the problems such as low utilization rate of xylose resources, single products and high production cost existing in the xylose industry and satisfies the requirements of changing the economic growth mode advocated in China, reducing production cost and protecting the environment.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing lignin by using xylose residue as a raw material. Background technique [0002] Lignin is a thermoplastic natural polymer material with a very rich source. It is widely found in woody plants, herbaceous plants, and vascular plants. It is amorphous and contains oxyphenylpropanol or its derivatives in its molecular structure. It is the second most abundant organic substance after cellulose in the world. The original color of lignin is white and nearly colorless. The color of lignin circulating in the market is light yellow to dark brown, powdery, with a specific gravity of 1.35-1.50, a high refractive index (1.61), and special ultraviolet absorption. spectrum. Lignin is widely used in building materials industry, petroleum industry, light industry, and agriculture. It is also an important part of human dietary fiber. It can change the activity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
Inventor 王成福杜瑞锋孙鲁王运刚李林罗希韬张瑞瑞
Owner FUTASTE PHARM CO LTD
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