Method for hydrolyzing lignocellulose

A lignocellulose-to-mass ratio technology, applied in the new field of lignocellulose hydrolysis, can solve the problems of complex lignocellulose pretreatment, high price of hydrolytic enzymes, and affecting saccharification rate, etc., and achieve single catalytic hydrolysis products and high hydrolysis efficiency , a well-tolerated effect

Inactive Publication Date: 2010-02-03
XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Biological enzymatic hydrolysis includes lignocellulose pretreatment and enzymatic hydrolysis. Due to its complex lignocellulose pretreatment, high energy consumption, and high price of hydrolytic enzymes, it is not easy to recycle, poor tolerance, long hydrolysis cycle, and microbial decomposition. Lignin can also produce cellulose and hemicellulase, which affects the saccharification rate

Method used

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  • Method for hydrolyzing lignocellulose
  • Method for hydrolyzing lignocellulose
  • Method for hydrolyzing lignocellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Using willow as the lignocellulose raw material, crush it to a powder of 10 μm, mix the willow powder and water uniformly at a mass ratio of 1:10, preheat the homogenate to 100°C with ultrasonic radiation, ultrasonic radiation power 1000W, duty cycle 1, ultrasonic The frequency is 40KHz, the temperature of the preheated homogenate is raised to 150°C, the pressure is 10MPa, Fe 3 o 4 / SO 4 2- The superacid is used as a catalyst, the amount of the catalyst is 1.0% of the weight of the lignocellulose, the stirring speed is 500 rpm, the reaction time is 60 minutes, and the hydrolyzed solution becomes light yellow.

Embodiment 2

[0031] Using pine as the lignocellulose raw material, crush it to 200 μm powder, pine powder and water are uniformly mixed at a mass ratio of 1:15, the homogenate is preheated to 120°C with ultrasonic waves, the ultrasonic radiation power is 2000W, the duty ratio is 0.8, and the ultrasonic frequency 40KHz, raise the temperature of the preheated homogenate to 180°C, pressure 20MPa, CAT600 cationic resin as catalyst, catalyst dosage is 1.2% of lignocellulose weight, stirring speed 1000rpm, reaction time 75min, the hydrolyzate becomes brownish black.

Embodiment 3

[0033] Using poplar as the lignocellulose raw material, crush it to 500 μm powder, mix the poplar powder and water uniformly at a mass ratio of 1:25, and preheat the homogenate to 100°C with ultrasonic radiation power of 1500W, duty ratio of 0.6, Ultrasonic frequency 20KHz, heat the preheated homogenate to 180°C, pressure 20MPa, H 3 PW 12 o 40 / HZSM-5 heteropolyacid is used as a catalyst, the amount of the catalyst is 0.8% of the weight of lignocellulose, the stirring speed is 800rpm, the reaction time is 90min, and the hydrolyzate becomes black.

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Abstract

The invention discloses a method for hydrolyzing lignocellulose. Lignocellulose is pulverized into particles, and the particles are mixed with water to form even seriflux; the seriflux is preheated to60-150 DEG C by using ultrasonic waves or microwaves; the preheated even seriflux is quickly heated to 120-300 DEG C, solid acid is added and used as a catalyst, and stirring and catalytic reaction are simultaneously carried out for 15-300 minutes. The use of the ultrasonic waves or microwaves radiation in synergism with solid alkali for catalyzing and hydrolyzing the lignocellulose can greatly reduce the reaction time as well as energy consumption. The solid acid catalyst can be repeatedly used, is easily separated, and has the advantages of high mechanical strength, high durability, certainselectivity, relative singularity of catalytic hydrolyzate, high hydrolyzing efficiency and good market application prospect.

Description

technical field [0001] The invention belongs to the technical field of lignocellulose hydrolysis, and in particular relates to a new method for hydrolyzing lignocellulose. Background technique [0002] Bio-energy mainly includes bio-ethanol, bio-diesel, biogas and hydrogen, among which the research and production of bio-ethanol attract the most attention. Brazil uses sugarcane as raw material, and its annual output of fuel ethanol is more than 11 million tons. The United States uses corn as raw material to produce about 5.5 million tons of fuel ethanol every year. At present, the annual output of fuel ethanol in my country is more than 3 million tons, ranking third in the world after Brazil and the United States. However, the production of fuel ethanol uses sugar or grain as raw materials, and its output is limited by grain resources, making it difficult to meet energy demand for a long time. Lignocellulose is an important source of raw materials for the production of fue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/02
Inventor 邓欣方真张帆
Owner XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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