Novel pulping process for obtaining high performance fiber at high yield from plants

Abstract

The invention relates to a cleaning process for extracting high quality fiber with high efficiency, high yield and low energy consumption from plant raw materials by a combination method of chemistry and machinery in a sectional type. The process comprises the following steps: a raw material is fully immersed in a NaOH solution or a KOH solution or limewater with low concentration (black liquor is used for supplementing into the corresponding alkaline for repeated and circular use) under the normal temperature or certain temperature, wherein the concrete immersion temperature and immersion time can be determined according to the types and the water content of the raw materials so that the alkaline liquor is fully, uniformly and properly absorbed and diffused into plants; steaming under normal pressure or steaming with pressure or no liquid steaming with pressure is used; the steamed material can be selected according to the paper quality requirement by using a blowout slurrying mode or a mode of pulp refining after blowing to form slurry or by using thread rolling and pulp refining to relief material once or multitime to prepare slurry. The novel process combines the advantages of chemical treatment and mechanical pulping, so that the uniform mass transfer and uniform heat transfer can be ensured and the damage to cellulose and hemicellulose by excessive alkali can be reduced, the yield of fiber is raised to about 75% from about 45% of the prior art, so that the novel pulping process is capable of avoiding the usage of auxiliary agents like sulfured and anthraquinone, conveniently extracting and using the cellulose and lignin in black liquor, and overcoming the influence on environment during the process of pulping and post-treating lignin.

Description

technical field [0001] The invention relates to a new segmental pulping process for extracting high-quality fibers from plant raw materials with high efficiency, high yield and low energy consumption. Through ingenious innovation and integration of chemical and mechanical pulping processes, a production technology for obtaining high-performance natural color pulp with high yield has been invented. The fiber yield of bamboo pulp raw materials can be increased from about 45% of the existing process to about 75%. The physical properties of pulp can be better than the standard of A-grade kraft paper, and can replace wood pulp. The performance of other non-wood pulps has also been significantly improved, which solves the problem of traditional chemical pulp with good performance but low pulp yield, and mechanical pulp with high yield. Paradox of poor performance. The new process eliminates additives such as sulfide and anthraquinone, and avoids the generation of sulfide and H 2 T...

AI Technical Summary

Problems solved by technology

The use of a large amount of alkali not only increases the cost of papermaking, but also makes it difficult to recycle a large amount of papermaking black liquor

[0004] Mechanical pulp is mainly made into pulp through mechanical grinding, which contains high lignin, and has the advantages of simple production process, low cost, high yield, low pollution, good paper printing performance, good smoothness, and high opacity. Paper cannot be stored for a long time, especially mechanical pulp mainly relies on physical methods to process wood materials, which consumes a lot of energy. One ton of pulp requires more than 1,000 kilowatt-hours of electricity. During the grinding process, the fibers are severely broken, the composition is complex, and the effect of fiber separation is poor. , resulting in poorer properties of the pulp

[0005] Aiming at the deficiencies of the existing chemical and mechanical pulping processes, the inventors have found through experiments that the main reasons for the large loss of raw materials, low fiber extraction rate, poor quality, and large performance fluctuations in the existing fiber extraction process are excessive alkali, lye Uneven distribution and a large amount of damage to active ingredients such as fiber and lignin caused by long-term high-temperature cooking

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