Cleaner production of paper by straw and lignin modification process

Abstract

The invention discloses the agricultural and subsidiary products straw stalk resources clean production paper and the modified lignin new craft. The craft the black liquor took the precious resources, in steams and its concentrates two stages separately to join the modifier, steams the medicinal preparation, the molecular weight and the performance regulation medicinal preparation, fully uses in the straw stalk the textile fiber, the lignin equicomponent, always will pollute the traditional straw pulp juice the load approximately 90% elimination in the technological process. The craft suits the size middle and small scale straw pulp paper mill use, becomes paper pulp which delivers rate high, the viscosity is low, Yi Xiyi floats, more importantly the by-product lignin after the modification, has performance and so on good disperser caking conformity, widely uses in the cement sur- medicinal preparation, the water coal tar chemical additive, the agricultural chemicals dispersing agent and so on.

Description

technical field [0001] The invention relates to a pulping and papermaking technology and a new method of environmental protection, in particular to a new technology of straw resource utilization of agricultural and sideline products, clean production of paper and modified lignin. Background technique [0002] my country's forest resources are scarce, the integration of forestry and paper is progressing slowly, and there is a serious shortage of papermaking raw materials. And my country is a big agricultural country, and agricultural by-product straw is abundant, especially after banning burning, how to utilize straw papermaking and not pollute the environment is worth studying. Traditional straw pulp papermaking only uses straw fibers, and the rest are discharged as waste, which not only wastes resources but also seriously pollutes the environment. Lignin is the second most abundant natural polymer compound in nature, its content in plants is second only to cellulose, and i...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many methods for the treatment of papermaking wastewater pollution, but most of them are "end treatment"

There are many disadvantages in terminal treatment: such as large investment in infrastructure, high operating costs, and secondary pollution. low output

Contradicts with the enterprise's main pursuit of economic benefits, this contradiction is the reason why it has been difficult to effectively combine environmental protection and production

The recovery method of straw pulp alkali requires a large investment. Due to the difficulty of evaporation and combustion in the process, the production cost is high and the stable operation is difficult, and there is secondary pollution of white mud. In addition, lignin is burned, which is a waste of resources.

There are many patents for the resource production of different products from straw pulp and papermaking black liquor, such as CN1032378C, CN1249373A, CN1075574C, CN1208027A, CN1275430A, CN1341568A, CN1379152A and other patents. The goal of pursuing economic benefits makes it difficult to promote the application

Many literatures have reported black liquor modification methods, but the process is complex and requires additional investment in equipment, which consumes manpower and energy. It is an end-of-pipe treatment method that pollutes first and then treats it, which is not easy for enterprises to accept.

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