Pulping process by using grasses as raw material

Abstract

The invention relates to a pulping process by using grasses as a raw material, and belongs to the field of paper making. The pulping process comprises twice cooking steps, wherein the cooking liquid used in primary cooking is prepared from the following components in percentage by mass: 5-8 percent of sodium hydroxide, 0.5-1.0 percent of sodium sulfite, 1-2.5 percent of sodium sulfide, 0.3-0.5 percent of anthraquinone, 0.02-0.1 percent of sodium dodecyl sulfate and the balance of water; and the cooking liquid used in secondary cooking is a mixed enzyme liquid consisting of an enzyme liquid I and an enzyme liquid II in a mass ratio of (1-3):1. The process has small dosage of alkali and enzyme to reduce waste emission, and is environment-friendly since the mixed enzyme cooking liquid can beused repeatedly; and furthermore, the process has short cooking time and good cooking effect.

Description

technical field

[0001] The invention relates to a pulping process using gramineous plants as raw materials, belonging to the field of papermaking. Background technique

[0002] Paper production is divided into two basic processes: pulping and papermaking. The methods used in the pulping process include mechanical methods, chemical methods or a combination of both methods to dissociate plant fiber raw materials into natural pulp or bleached pulp. Among them, chemical pulping is a more commonly used method. Its principle is to use chemical liquid to cook the tablet, and the chemical agent reacts with the lignin in the tablet at high temperature to form water-soluble substances, so that the fibers are separated and dispersed into slurry. Pulping is further divided into alkaline pulping and acid pulping. Chemical pulping can roughly retain the natural length of the fiber, remove most of the lignin, and produce high-strength, soft high-grade paper, but its disadvantages are als...

Images