Method and device for hydrolyzing pulping

A hydrolysis reaction and reactor technology, which is applied in the field of papermaking and pulping, can solve problems such as environmental pollution and waste of plant resources, and achieve the effects of improving thermal power efficiency, improving utilization rate, and reducing thermal power conversion process
CN104674585AActive Publication Date: 2015-06-03GUANGXI UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGXI UNIV
Publication Date
2015-06-03

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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.
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Description

technical field

[0001] The invention relates to the field of paper pulping, in particular to a hydrolysis pulping method and a device thereof. 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 cooking of plant raw materials in the presenc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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