Method and device for hydrolysis pulping in transcritical CO2 reaction system

A reaction system and transcritical technology, applied in the field of papermaking and pulping, can solve problems such as waste of plant resources and environmental pollution, and achieve the effects of improving thermal power efficiency, reducing effective energy loss, and improving utilization rate

Active Publication Date: 2017-03-29
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most paper mills in China use alkaline pulping, and the black liquor discharged is the wastewater with the highest concentration of pollutants and the deepest color in the pulping process, which contains a large amount of degradation products such as lignin and hemicellulose, pigments, Pentose sugars, residual alkali and other leached substances, about 10 tons of black liquor are discharged for every ton of pulp produced, which not only causes waste of plant resources but also causes serious environmental pollution problems, which is the most difficult problem and research hotspot in the paper industry

Method used

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  • Method and device for hydrolysis pulping in transcritical CO2 reaction system
  • Method and device for hydrolysis pulping in transcritical CO2 reaction system
  • Method and device for hydrolysis pulping in transcritical CO2 reaction system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as Figure 1 to Figure 4 As shown, the device for hydrolysis pulping in the transcritical CO2 reaction system includes: a preprocessor 1, a reactor 2, an expander 3, a turbocompressor 4, a gas-liquid separator 5, and a blower 6.

[0039] The discharge port of the preprocessor 1 is connected with the feed port of the reactor 2, and the preprocessor 1 is used for heating and pretreating the raw materials required for production. The reactor 2 is cylindrical. The upper part of the reactor is provided with a feed inlet 21 and a gas outlet 22, and the bottom is provided with a feed outlet 23. The reactor 2 includes a heating pipe 24, which is a heating coil, which is located inside the reactor. a gas distributor 25, which includes an air inlet 251 and a plurality of nozzles 252 for exhaust; the expander 3 is connected to the gas outlet of the reactor 2. The turbocompressor 4 is connected to the expander 3 , and the turbocompressor 4 is driven to work by the expander 3 ...

Embodiment 2

[0048] The reaction device that uses is identical with embodiment 1, a kind of transcritical CO The method for hydrolysis pulping of reaction system comprises the following steps:

[0049] (1) Prepare the raw materials, mix water and bagasse in a mass ratio of 200:1, and then preheat;

[0050] (2) Hydrolysis reaction, put the mixture prepared in step (1) into the reactor, heat up to 300°C, and fill the reactor with CO 2 , the temperature in the reactor is 300°C, and the pressure is 15MPa;

[0051] (3) Take out the mixed gas after reaction in the reactor, the mixed gas contains CO 2 , water vapor, furfural and acetic acid, the flow rate of the mixed gas taken out from the reactor is 0~10000m 3 / h, when the gas flow rate is 0, no gas flows out. Pass the gas through the expander, expand and reduce the pressure to 0~1.0MPa, cool down to 20℃~30℃, enter the gas-liquid separator for separation, the temperature of the gas-liquid separator is 10~20℃, and the pressure is 0.0~ 1.0MPa...

Embodiment 3

[0054] The reaction device that uses is identical with embodiment 1, a kind of transcritical CO The method for hydrolysis pulping of reaction system comprises the following steps:

[0055] (1) Prepare the raw materials, mix water and bagasse in a mass ratio of 70:1, and then preheat;

[0056] (2) Hydrolysis reaction, put the mixture prepared in step (1) into the reactor, heat up to 500°C, and fill the reactor with CO 2 , the temperature in the reactor is 500°C, and the pressure is 30MPa;

[0057] (3) Take out the mixed gas after reaction in the reactor, the mixed gas contains CO 2 , water vapor, furfural and acetic acid, the flow rate of the mixed gas taken out from the reactor is 0~10000m 3 / h, when the gas flow rate is 0, no gas flows out. Pass the gas through the expander, expand and reduce the pressure to 0~1.0MPa, cool down to 20℃~30℃, enter the gas-liquid separator for separation, the temperature of the gas-liquid separator is 10~20℃, and the pressure is 0.0~ 1.0MPa,...

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Abstract

The invention discloses a method for hydrolyzing pulping. The method comprises the following steps: (1) preparing raw materials, namely, mixing water and wood chips or grass chips in mass ratio of 2:1-200:1, and then preheating; (2) caryring out hydrolyzing reaction, namely, feeding a mixture obtained in step (1) into a reactor, charging CO2 into the reactor, wherein the temperature in the reactor is 80 to 500 DEG C and the pressure is 3 to 50MPa; enabling the charged CO2 to enter a supercritical state or a subcritical state under the conditions that the temperature in the reactor is 80 to 500 DEG C and the reaction pressure is 0.5 to 50.0MPa; (3) discharging the mixed reacted gas from the reactor; and (4) reacting for 1 to 6 hours, discharging pressure-reduced materials from the reactor, and reacting to obtain pulp and reducing sugar. According to the method, supercritical / subcritical CO2 is dissolved in water to be used as protonic acid to replace caustic soda or sulphate or sulfite to pulp by the chemical method, so that the emission amount of heavy-polluted wastewater can be reduced; in addition, the pulping method is free of black liquor or waste gas emission, so that the pulping method is an environmentally-friendly pulping method.

Description

technical field [0001] The invention relates to the field of papermaking and pulping, in particular to a method and device for hydrolyzing pulping in a transcritical CO2 reaction system. Background technique [0002] Paper and cardboard are mainly made of pulp, and the pulping methods can be divided into: chemical method and mechanical method, as well as chemical mechanical method and semi-chemical method in between. Among the world's pulp production, chemical pulp accounts for 72.4%, mechanical pulp accounts for 16.6%, and the rest accounts for about 11.0%. Chemical pulping is divided into alkali method and acid method, and the alkali method includes lime method and caustic soda method. The main purpose of chemical pulping is to remove as much intercellular lignin as possible from the plant fiber raw materials that binds the fibers together to make pulp. The pulping process mainly includes cooking, washing and bleaching processes. The cooking process is high-temperature c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/04D21C3/20D21C7/00
CPCD21C3/04D21C3/20D21C7/00
Inventor 陈小鹏梁杰珍王琳琳韦小杰王华生
Owner GUANGXI UNIV
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