Instantaneous vaporization and expansion of grass slices - osmotic pulping method

Abstract

The invention discloses a method for instantaneous vaporization and expansion inside grass slices-infiltration pulping. Soak the grass slices with an organic solvent for 5 to 120 minutes, then add boiling water at 100°C or water vapor whose temperature is higher than the boiling point of the organic solvent according to the mass ratio of the grass slices to water 1:1 to 1:20, and then under the condition of supercritical CO2 Under cooking pulping. The method of the invention causes the cell membrane to expand and rupture through the instant vaporization of the organic solvent between the fiber cells of the grass slice, so that the rate of removing intercellular lignin by cooking the grass slice is accelerated by 1-5 times, and the consumption of the organic solvent is reduced by 2-10 times.

Description

technical field [0001] The invention relates to a papermaking pulping process, in particular to a method for instantaneous vaporization expansion-infiltration pulping inside a grass slice. Background technique [0002] The total output of paper and paperboard in the world is about 400 million tons per year, and China's paper and paperboard production ranks first in the world. Paper and cardboard are mainly made of pulping, and the pulping process can be divided into: chemical method and mechanical method, as well as chemical mechanical method and semi-chemical method in between. At present, most paper mills in China use the chemical alkaline pulping method. Although the technology of the traditional pulping method is very mature, about 10 tons of black liquor is discharged for every ton of pulp produced, which not only causes waste of plant resources but also easily causes serious damage. environmental pollution problems. Therefore, the transformation and innovation of pap...

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Problems solved by technology

[0006] In the above-mentioned prior art, although it has a better pulping rate, the raw material sodium hydroxide used has a greater impact on the environment, and the waste water after pulping is still treated in a traditional way or requires a large amount of time. Energy and funds are used to deal with it. On the one hand, it will increase the cost of wastewater treatment for enterprises, and on the other hand, it will easily pollute the environment if it is not handled well.

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