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Method for hydrolyzing straw by continuous reaction of ultra-low acid

A chemical reaction, ultra-low acid technology, applied in the field of using ultra-low acid continuous reaction to hydrolyze straw, can solve the problems of catalyst consumption inhibition, short reducing sugar residence time, low production efficiency, etc., and achieve short residence time and conversion rate. High and productive effect

Inactive Publication Date: 2012-08-22
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of efficient ultra-low-acid ultra / subcritical continuous reaction hydrolysis method for straw, which has the advantages of short residence time of reducing sugar, high production efficiency, small product inhibition and high conversion rate, and can overcome The problems of high pollution, high catalyst consumption, strong inhibitory effect of biotechnology products and low production efficiency of traditional technology

Method used

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  • Method for hydrolyzing straw by continuous reaction of ultra-low acid
  • Method for hydrolyzing straw by continuous reaction of ultra-low acid
  • Method for hydrolyzing straw by continuous reaction of ultra-low acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] like figure 1 As shown, the high-pressure reactor includes a kettle body 1 , a stirring paddle 2 , a thermocouple 3 , a magnetically coupled stirrer 4 , a pressure explosion-proof valve 5 , a pressure gauge 6 and an air release valve 7 .

[0024] 2-200 mesh bagasse raw material 30g, the solid-liquid weight ratio in the reaction kettle is 1:9, distilled water is the reaction medium. The reaction starts at 240°C and the water sample is fed, and at the same time, the water outlet is opened to collect the hydrolyzate, 10ml each time. The process of continuous reaction is as follows figure 2 shown. Table 1 shows the effects of different reaction temperatures in the autoclave on the production of reducing sugar and furfural from bagasse.

[0025] Table 1

[0026]

[0027] The yield of reducing sugar in the autoclave was significantly increased, and the yield of furfural was also reduced.

Embodiment 2

[0029] 100-200 mesh bagasse raw material 30g, the solid-liquid weight ratio in the reactor is 1:6, the H of pH=5 2 SO 4 as the reaction medium. The reaction starts at 240°C and the water sample is fed, and at the same time, the water outlet is opened to collect the hydrolyzate, 10ml each time. Table 2 shows the effects of different reaction temperatures in the autoclave on the production of reducing sugar and furfural from bagasse.

[0030] H at pH=5 2 SO 4 The yield of reducing sugar in the high-pressure reactor used as the reaction medium is significantly improved, and the production of reducing sugar and the elimination of furfural are helpful under weak acid conditions, because the weak acid increases the ionization degree of the solution in the super / subcritical reaction, making the straw The cellulose, hemicellulose and lignin are completely separated, and the decomposition of each component of the straw is catalyzed.

[0031] Table 2

[0032]

Embodiment 3

[0034] 2-200 mesh rice straw raw material 30g, the solid-liquid weight ratio in the reactor is 1:12, pH=3 H 2 SO 4 as the reaction medium. The reaction starts at 233°C and the water sample is fed, and at the same time, the water outlet is opened to collect the hydrolyzate, 10ml each time. The effects of different reaction temperatures in the autoclave on the production of reducing sugar and furfural from rice straw are shown in Table 3.

[0035] table 3

[0036]

[0037] The impact of different reaction modes on the yield of reducing sugar is shown in Table 4. In summary, the present invention has the advantages of short residence time of reducing sugar in the reactor, high production efficiency, small product inhibition, and high conversion rate, and can overcome the high pollution, high catalyst consumption, and strong inhibition of biotechnology products in traditional technologies. The problem of low production efficiency.

[0038] Table 4

[0039]

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Abstract

The invention relates to a method for hydrolyzing straw by continuous reaction of ultra-low acid. The method comprises the following steps of: grinding the straw to be 2-200 meshes; adding the straw and dilute acid with the pH of 3-7 into a high pressure reactor in a weight ratio of 1: (6-12), and stirring; sealing the high pressure reactor, opening condensate water and heating the high pressure reactor; when the high pressure reactor is heated up to 180-250 DEG C, opening a sampling pump, wherein the flow rate of the sampling pump is 0.5-3 times of the volume of the reactor per hour; adjusting the position of an air compression valve; in the reaction process, maintaining the pressure to be 22.1-40.0MPa and the temperature to be 240-415 DEG C; opening the air outlet of the reactor and a pressure control valve connected with the air outlet; and collecting a liquid flowing out of the pressure control valve. The method can be used for separating reducing sugar generated in the reactor in time and separating poisonous substance, thus improving the yield of the reducing sugar and being beneficial to improvement of the yield of alcohol produced by fermentation.

Description

technical field [0001] The invention relates to a method for hydrolyzing straw, in particular to a method for hydrolyzing straw by using ultra-low acid continuous reaction. Background technique [0002] In recent years, the research on biomass new energy using crop straw as raw material has become a new research hotspot, among which the ethanolization technology of straw has attracted much attention, and the development of fuel ethanol has been listed as a national policy in my country. Ethanol is mainly produced by the fermentation of starch raw materials. However, due to the rapid growth of population, the method of exchanging grain for ethanol is bound to be unsustainable. Now some countries have banned the use of grain to produce ethanol. Therefore, it is imperative to develop cellulosic ethanol, which not only saves straw resources and reduces environmental pollution, but also produces considerable value from cellulosic ethanol. [0003] The process of preparing ethano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K1/02C13K5/00C13K7/00C13K11/00C13K13/00
Inventor 檀雅琴申哲民夏前勇温钰娟
Owner SHANGHAI JIAO TONG UNIV
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