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Method for preparing xylo-oligosaccharides, dissolving pulp and bio-fuel from biological straw

A technology of biological straw and xylo-oligosaccharide, which is applied to pulping with inorganic alkali, preparation of liquid hydrocarbon mixture, and cellulose treatment with microorganisms/enzymes, etc., can solve the problem of making crop straws more fully and efficiently utilized. , did not give problems such as the use of hydrolyzate and black liquor

Active Publication Date: 2016-10-12
临颍路得生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN 102268833 B discloses the use of steam-exploded and water-washed crop stalks to prepare dissolving pulp, but it does not provide further utilization methods for hydrolyzed liquid and black liquor, and at the same time, neither the pre-treatment nor the preparation process of the crop stalks Can form a more adequate and efficient utilization of crop straw

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Cut the corn stalks into 3-5cm sections, remove impurities, and mix with CeCl 3 , acidic ionized water are mixed in proportion, and precooked in a continuous cooking reactor (TS0040 type continuous cooking reactor of Tianjin Zhongqing Machinery Co., Ltd.), wherein the CeCl 3 The dosage is 2wt% of the dry mass of corn stalks, the mass ratio of the dry basis of corn stalks to acidic ionized water is 1:6, and during precooking, oxygen is introduced into the reactor for precooking operation, so The amount of oxygen introduced is 2wt% of the dry mass of corn stalks, the precooking temperature is about 165°C, the pressure is about 1.7MPa, and the time is 10min;

[0047] Lower the temperature of the precooked slurry to 50-60°C, adjust the pH to 4.0 with acidic ionized water, and add xylanase with 350 standard enzyme activities based on the dry weight of corn stalk for 4 hours;

[0048] The pulp after enzymatic hydrolysis is subjected to five-stage press countercurrent washing...

Embodiment 2

[0052] Cut the wheat straw into 3-5cm sections, remove impurities, and mix with La(NO 3 ) 3 , acidic ionized water are mixed in proportion, and precooked in a continuous cooking reactor, wherein, the La(NO 3 ) 3 The dosage is 3wt% of the mass of wheat straw dry basis, the mass ratio of said wheat straw dry basis to acidic ionized water is 1:5, and during precooking, oxygen is passed into the reactor for precooking operation, and said oxygen The amount of feed is 2.5wt% of the dry weight of wheat straw, the precooking temperature is about 170°C, the pressure is about 1.6MPa, and the time is 10min;

[0053] Cool the precooked slurry to 50-60°C, adjust the pH to 5.0 with acidic ionized water, add xylanase with 450 standard enzyme activities based on the dry basis of wheat straw, and perform enzymatic hydrolysis for 3.5 hours;

[0054] The pulp after enzymolysis is subjected to five-stage press countercurrent washing with a press machine. The washing conditions are: solid-to-li...

Embodiment 3

[0057] Cut the straw into 3-5cm sections, remove impurities, and mix with Y 2 (SO 4 ) 3 , Acidic ionized water is mixed in proportion, and precooked in a continuous cooking reactor, wherein, the Y 2 (SO 4 ) 3The dosage is 1wt% of the dry basis mass of rice straw, the consumption of said acidic ionized water is 8 times of the dry basis quality of rice straw, and when precooking, in the reactor that carries out precooking operation, pass into oxygen, the amount of said oxygen The feeding amount is 4wt% of the dry weight of rice straw, the precooking temperature is about 160°C, the pressure is about 1.9MPa, and the time is 6min;

[0058] Cool the precooked slurry to 50-60°C, adjust the pH to 4.0 with acidic ionized water, add xylanase with 550 standard enzyme activities based on the dry basis of rice straw, and perform enzymatic hydrolysis for 3 hours;

[0059] The pulp after enzymolysis is subjected to five-stage press countercurrent washing with a press machine. The washin...

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Abstract

The invention discloses a method for preparing xylooligosaccharide, dissolving pulp and biological fuel oil from biological straws. The method comprises carrying out pre-stewing and enzymatic hydrolysis on biological straws, carrying out multistage squeezing counter current washing on the enzymatic hydrolysis product to obtain enzymatic hydrolysis slag and an enzymatic hydrolysis washing liquid, carrying out clarification and further purification on the enzymatic hydrolysis washing liquid, carrying out condensation and drying to obtain xylooligosaccharide, pulping the enzymatic hydrolysis slag, separating black liquor, carrying out washing and screening on the separated pulp, carrying out delignification, pretreatment and bleaching to obtain dissolving pulp, carrying out gasification on the black liquor, and carrying out purification and Fischer-Tropsch synthesis to obtain biological fuel oil. The method realizes full and high efficiency utilization of a straw resource, reduces a production cost, realizes industrial application, is free of exhaust gas, waste residue and waste liquid discharge and is an eco-friendly production technology.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of biomass, and in particular relates to a method for preparing xylooligosaccharides, dissolving pulp and biofuel from biological straws. Background technique [0002] With the increasingly serious situation of energy shortage, environmental pollution and climate change, the comprehensive utilization industry of biological straw has become another new leading industry leading the development of technological innovation and advanced productivity in the contemporary world. [0003] Biological straw is one of the most commonly used non-wood fiber raw materials in the dissolving pulp industry. They grow rapidly and have a huge output. They are different from wood raw materials in terms of chemical composition and structure, such as the combination of cellulose and hemicellulose, The combination of cellulose and lignin is relatively loose, easy to cook, and the cooked biological straw is easy t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C9/147D21C9/02C12P19/14C10G2/00
CPCC10G2/30C12P19/14D21C3/026D21C5/00D21C5/005D21C9/02D21C9/147
Inventor 李秀芳张冰青陈家效王斌陈浩张祎晶
Owner 临颍路得生物科技有限公司
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