Pulping agent and its application production method

Abstract

The invention relates to an energy-saving and emission-reducing pulping agent and a method for applying the same to production. The pulping agent used in a pulping method consists of sodium carbonate, NaOH, a cooking aid, chlorine dioxide and a silicate stabilizer. The pulping method for applying the pulping agent to a production flow comprises the following steps of: 1, preparing materials with a dry-wet process, washing raw materials and pressing cotton; 2, undergoing a cooking reaction, spraying or grinding into a thick liquid; 3, separating pulp and recycling a black liquor; 4, recovering an alkali; and 5, bleaching and washing the pulp. Due to the adoption of the pulping method, energy saving and emission reduction are realized for the papermaking industry by controlling pollution from a source, and the technical problem of pulping of agricultural straw and grass fibers is solved; the pulping agent is nontoxic, harmless and non-corrosive, and can be cooked at the normal temperature and under the normal pressure; the generating capacity of the black liquor per ton is reduced by 80 percent compared with that of the black liquor per ton by using the conventional pulping method; crude pulp is easy to clean and bleach, bleaching water can be recycled, and the water consumption and drainage per ton of pulp are reduced by 70 percent compared with those of the conventional pulp; the steam consumption is reduced by one third; foul odor generated by total reduced sulfur is eliminated; the investment can be saved by one third compared with that made by a similar-sized pulping plant; and industrial production can be realized.

Description

Technical field [0001] The invention belongs to the field of pulping and papermaking industry, and relates to a pulping agent and an application production method thereof. Background technique [0002] Although my country’s paper industry has developed rapidly in recent years, there are also more prominent problems that have become a bottleneck restricting my country’s papermaking work to become bigger and stronger: First, the lack of forest resources has led to an increasingly tight supply of my country’s pulp, imported wood pulp and imported waste. Paper has increased substantially, thus supporting and affecting the current pattern and development of my country's paper industry. But at the same time, my country is a big agricultural country, and produces a large amount of annual agricultural straw fiber raw materials such as bagasse, corn stalk, cotton stalk, mulberry stalk, etc., in addition to a large amount of wheat straw, reed and other grass fibers and wood processing resid...

AI Technical Summary

Problems solved by technology

[0002] Although my country's paper industry has developed rapidly in recent years, there are still relatively prominent problems that have become bottlenecks restricting the expansion and strengthening of my country's paper industry: First, the lack of forest resources has led to an increasingly tight supply of pulp in my country, and imports of wood pulp and waste The substantial increase of paper has supported and influenced the existing pattern and development of my country's paper industry

But at the same time, my country is a large agricultural country, which produces a large amount of annual agricultural straw fiber raw materials such as bagasse, corn stalks, cotton stalks, mulberry stalks, etc., in addition to a large amount of grass fibers such as wheat straw and reeds, and wood processing residues, etc. Resources can be used as raw materials for pulping and papermaking. Due to the difficulty in solving pulping technology and environmental protection problems, this kind of resources is wasted.

Traditional pulping methods include caustic soda method, sulfate method, ammonia method, etc., mainly using strong acid, strong alkali and organic additives. Due to the large amount and low concentration of the black liquor produced, it needs to be evaporated and concentrated to burn and causticize to recover alkali. The investment is large and the operation and management are difficult. Small-scale pulping enterprises, especially those that use grass fiber as raw material, cannot afford it. At the same time, the traditional pulping method cannot effectively solve the technical problems of thick agricultural straw and difficult pulping.

In addition, because pulp washing wastewater produces a large amount of dilute black liquor, which contains organic additives, and bleaching wastewater contains acids, alkalis, organic chlorides, etc., the middle wastewater treatment load is relatively large, and the biochemical properties are poor. Anaerobic and aerobic biochemical It is difficult to meet the emission standards stably, and the treatment cost is high, which is unbearable for enterprises

All these have restricted the development of my country's pulp production

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