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New technology for preparing medicinal microcrystalline cellulose by using enzyme to catalyze hydrogen peroxide to whiten lignocellulosic type biomass

A technology of lignocellulose and microcrystalline cellulose, which is applied in fermentation and other directions, can solve the problems of high concentration of hydrogen peroxide, potential safety hazards, and high cost of raw materials, and achieve the effects of reducing concentration, increasing content, and speeding up the rate

Active Publication Date: 2017-08-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is weak to the loss of lignocellulose structure, but the concentration of hydrogen peroxide is too high, the cost of raw materials is high, and the phenomenon of spraying is prone to occur, which has potential safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Raw material pretreatment: Weigh a certain amount of rice straw, and directly follow the publication number of Yao Risheng, Deng Shengsong, etc.: CN104343030 A. The name of the invention is steps (1) and (2) in a continuous atmospheric pressure pretreatment process for lignocellulosic biomass. ), (3) method to obtain SO 3 Slightly hot popped straw, take it out after the end, and keep a sample for future use.

[0030] Acidolysis: Take 30g of the total cellulose obtained after the above straw pretreatment, place it in 300mL, 2M dilute hydrochloric acid solution, stir for 2.5h at 90°C, wash with deionized water and filter until the filtrate is neutral.

[0031] One-time bleaching: add the total cellulose obtained after acid hydrolysis to 300mL, 2gNaClO 2 In the deionized water solution with pH=2, stir for 6h at 75℃, during which 4gNaClO is added to the solution every 1h 2 , A total of 3 times. After the reaction, wash with deionized water and filter until the filtrate is neutral...

Embodiment 2

[0035] Raw material pretreatment: the same as the treatment method in Example 1;

[0036] Acidolysis: Take 30g of total cellulose obtained after the above straw pretreatment, place it in 450mL, 1M dilute sulfuric acid solution, stir at 80°C for 3h, wash with deionized water and filter until the filtrate is neutral.

[0037] One-time bleaching: add the total cellulose obtained after acid hydrolysis to 300mL, 4g NaClO 2 In the deionized water solution with pH=2.5, stir for 8h at 85℃, during which 2gNaClO is added to the solution every 1.5h 2 , A total of 4 times. After the reaction, wash with deionized water and filter until the filtrate is neutral.

[0038] Enzyme-catalyzed hydrogen peroxide bleaching: add the total cellulose obtained after bleaching to 150mL, 4% H 2 O 2 Adjust the pH of the diluted hydrogen peroxide solution to 9.0 with a small amount of concentrated NaOH solution in the deionized aqueous solution, and add 1.2% Serratia marcescens extracellular enzyme crude enzyme sol...

Embodiment 3

[0041] Straw pretreatment: the same as the treatment method in Example 1;

[0042] Acidolysis: Take 30g of total cellulose obtained after the above straw pretreatment, place it in 600mL, 1.8M dilute hydrochloric acid solution, stir for 2h at 95°C, wash with deionized water and filter until the filtrate is neutral.

[0043] One-time bleaching: add the total cellulose obtained after acid hydrolysis to 300mL, 2gNaClO 2 In a deionized water solution with pH=1.5, stir for 8h at 90℃, during which 3g NaClO is added to the solution every 2h 2 Solid, 3 times in total. After the reaction, wash with deionized water and filter until the filtrate is neutral.

[0044] Enzyme-catalyzed hydrogen peroxide bleaching: add the total cellulose obtained after bleaching to 90mL, 7%H 2 O 2 Adjust the pH of the diluted hydrogen peroxide solution to 11.0 with a small amount of concentrated NaOH solution in the deionized aqueous solution, and add 0.8% Serratia marcescens extracellular enzyme crude enzyme soluti...

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Abstract

The invention discloses a new technology for preparing medicinal microcrystalline cellulose by using an enzyme to catalyze hydrogen peroxide to whiten lignocellulosic type biomass. According to the new technology, crop biomass is used as raw material, a series of processing steps, such as preprocessing, acidolysis, sodium chlorite bleaching, viscid serratia exoenzyme catalyzing the hydrogen peroxide bleaching, ethanol lavation, filtering, drying and smashing, are conducted, a series of conditions, such as acid-base use amount, solid-liquid ratio, reaction time and temperature, are adjusted reasonably, and the medicinal microcrystalline cellulose product is prepared. According to the prepared product, the content of the medicinal microcrystalline cellulose is equal to or larger than 9.78%, the whiteness is larger than or equal to 80%, the pH value is 5.0-7.5, the chloride content is smaller than or equal to 0.03%, and the drying loss is smaller than or equal to 5%.

Description

Technical field [0001] The invention relates to the field of lignocellulosic biomass processing. Specifically, it relates to a new process for preparing medicinal microcrystalline cellulose by enzyme-catalyzed hydrogen peroxide bleaching lignocellulosic biomass. Background technique [0002] Microcrystalline cellulose (MCC) is a product with extreme degree of polymerization obtained by dilute acid hydrolysis of natural plant cellulose and various post-treatments. It is ultra-fine powder, short rod or porous with strong fluidity. The characteristics of particles are mainly manifested in the aspects of crystallinity, crystal grain size, water absorption, specific surface area, degree of polymerization and reaction performance. Due to the multifaceted functions and excellent performance of MCC, the demand at home and abroad is increasing day by day, and new uses are being continuously developed. Such as emulsifiers, high temperature stabilizers, foam stabilizers, thickeners, suspe...

Claims

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Application Information

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IPC IPC(8): C12P19/04C08H7/00
CPCC08H6/00C12P19/04C12P2201/00
Inventor 邓胜松潘春雨董志江姚日生
Owner HEFEI UNIV OF TECH
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