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Method for dilute acid pretreatment of plant straws by microwave-cyclic compression percolation

A plant straw and pretreatment technology, applied in the direction of biofuel, sugar production, food science, etc., to achieve the effect of reducing further degradation, fast heating speed, and uniform heating speed

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, research on microwave pretreatment is still in the laboratory stage

Method used

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  • Method for dilute acid pretreatment of plant straws by microwave-cyclic compression percolation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Crush the corn stalks into 10-20mm particles. Take 200g of straw particles and measure 400mL of prepared 0.5% (w / w) dilute sulfuric acid solution, which contains 0.1mol / L Fe 2 (SO 4 ) 3 , Slowly pour dilute sulfuric acid into a plastic bucket with corn stalks, stir repeatedly until the solid and liquid are evenly mixed, then seal it and let it soak at room temperature for 24 hours.

[0036] (2) Add the soaked corn stalks into the reactor, and feed 0.2% (w / w) dilute sulfuric acid at a rate of 80mL / min, which contains 0.08mol / L Fe 2 (SO 4 ) 3 , start the elastic compressor and the microwave generator at the same time, the microwave power is 1000w / (kg dry straw), the mode of action is to act on the microwave for 3min every 2min, the reaction temperature is controlled at 180°C, and the reaction pressure is 12atm.

[0037] (3) After the liquid in the reactor is separated from the solid, pump fresh acid into the reactor to submerge the solid. The concentration of the...

Embodiment 2

[0041] (1) Crush the corn stalks into 10-20mm particles. Take 200g of straw granules, measure 400mL of prepared 0.5% (w / w) dilute sulfuric acid, which contains 0.1mol / L Fe 2 (SO 4 ) 3 , Slowly pour dilute sulfuric acid into a plastic bucket with corn stalks, stir repeatedly until the solid and liquid are evenly mixed, then seal and soak at room temperature for 24 hours.

[0042] (2) Add the soaked corn stalks into the reactor, and feed 0.2% (w / w) dilute sulfuric acid at a rate of 120mL / min, which contains 0.08mol / L Fe 2 (SO 4 ) 3 , start the elastic compressor and the microwave generator at the same time, the microwave power is 2000 watts / (kg dry straw), the mode of action is to act on the microwave for 3 minutes every 2 minutes, the reaction temperature is controlled at 180 ° C, and the reaction pressure is 12 atm.

[0043] (3) After the liquid in the reactor is separated from the solid, pump fresh acid into the reactor to submerge the solid. The concentration of the fre...

Embodiment 3

[0047] (1) Take 200g of corn stalks with a particle size of 10-20mm, and measure 400mL of prepared 0.5% (w / w) dilute sulfuric acid, which contains 0.1mol / L Fe 2 (SO 4 ) 3 , Slowly pour dilute sulfuric acid into a plastic bucket with corn stalks, stir repeatedly until the solid and liquid are evenly mixed, then seal and soak at room temperature for 24 hours.

[0048] (2) Add the soaked corn stalks into the reactor, and feed 0.2% (w / w) dilute sulfuric acid solution at a rate of 160mL / min, which contains 0.08mol / L Fe 2 (SO 4 ) 3 , start the elastic compressor and the microwave generator at the same time, the microwave power is 3000 watts / (kg dry straw), the action mode is to act on the microwave for 3 minutes every 2 minutes, the reaction temperature is controlled at 180°C, and the reaction pressure is 12atm.

[0049] (3) After the liquid in the reactor is separated from the solid, pump fresh acid into the reactor to submerge the solid. The concentration of the fresh acid is ...

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Abstract

The invention discloses a method for dilute acid pretreatment of plant straws by microwave-cyclic compression percolation. The method comprises: first conducting standing infiltration on straw particles with a dilute acid solution, then loading the straw particles into a cylindrical reactor, performing fed-batch of the dilute acid solution to the reactor, and at the same time, applying the action of microwave and compressing the straw particles, and discharging the liquid in the reactor; after solid-liquid separation, re-injecting the acid solution and dispersing the straw particles uniformly; carrying out fed-batch of the filtrate obtained from the separation to the reactor, and at the same time, applying the action of microwave and compressing the straw particles, and discharging the liquid in the reactor; and repeating the operations till the end of the reaction. By infiltrating the straw particles in the acid solution in advance and adopting a filtrate cyclic compression mode, the method provided in the invention reduces the concentration and dosage of the acid solution, increases the reaction product concentration, and enhances the reaction speed simultaneously.

Description

technical field [0001] The invention belongs to the field of biochemical industry, and particularly relates to a method for pretreating plant stalks by microwave-circulation compression percolation dilute acid, which is mainly used for pretreatment of various plant stalks such as corn stalks, wheat stalks and sweet sorghum stalks. Background technique [0002] Untreated straw is difficult to be hydrolyzed by microorganisms and enzymes, mainly because of the complex structure of lignocellulose that constitutes the cell wall of straw. Lignocellulose mainly includes cellulose, hemicellulose and lignin. The cellulose molecules are arranged regularly and aggregated into bundles. The fibril framework is filled with hemicellulose and lignin, and there are hydrogen bonds and chemical bonds between them. etc., making its structure very tight. Therefore, the key to efficient utilization of straw components is to separate cellulose from hemicellulose and lignin through pretreatment of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K1/02C13K13/00
CPCY02E50/10
Inventor 唐开宇黎元生张全
Owner CHINA PETROLEUM & CHEM CORP
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