ZYX catalyst for preimpregnation catalysis of plant fiber pulping and process utilizing the same

Abstract

The invention relates to the field of pulping and papermaking, and particularly relates to a ZYX catalyst for preimpregnation catalysis of plant fiber pulping and a process utilizing the same. The catalyst is environmentally friendly and efficient and includes anhydrous sodium sulfate, sodium hydroxide, sodium dodecyl sulfonate, cellulase, a fiber softening degrading agent, a preservative, and thelike. The pulping process utilizing the catalyst avoids heating, soaking and water emission, and allows a raw material to be naturally catalyzed, heated and softened; produced fiber pulp is uniform in fiber length, high in strength and good in toughness; waste liquid is low in emission and low in pH value, and can be recovered, thus avoiding passivation of secondary application effect, protectingthe environment, and achieving a low cost and a high efficiency. The process is a model for clean pulping.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to a ZYX prepreg catalyst for catalyzing the pulping of plant fibers and an application process. Background technique [0002] The most important link in the papermaking process is the pulping process. The traditional pulping process has always followed the steps of drug soaking, high-temperature cooking, beating, pulp washing, screening, and squeezing. With the increasingly stringent environmental protection requirements, the disadvantages of the traditional pulping process are becoming more and more obvious. There are four main traditional pulping processes: blasting pulping, cooking pulping, cold soaking pulping, and spray pulping. Explosive pulping uses a medium pressure of about 1.6 MPa, pressurized to a special blasting tank for about 13 minutes and sprays it instantly, so as to explode the raw materials in the tank into pulp. The pulp is fast, but the disadvantage is ...

AI Technical Summary

Problems solved by technology

Explosive pulping uses a medium pressure of about 1.6 MPa, pressurized to a special blasting tank for about 13 minutes and sprays it instantly, so as to explode the raw materials in the tank into pulp. The pulp is fast, but the disadvantage is that high temperature and high pressure are required, and the heat is not easy to control. If the spraying time is short, it will not burst into pulp, and it is easy to block the discharge pipe. If the spraying time is long, the raw materials are easily gelatinized and carbonized. , and the pulping can only be made of low-grade paper products, so the scope of promotion is small and the value is not great; cooking pulping adopts normal pressure and high temperature facilities such as cooking spirals, cooking tanks, cooking warehouses, etc., and the raw materials soaked in the liquid medicine are placed into it, put steam at about 0.5MPa into it and cook for 2-3 hours to achieve the purpose of pulping. High COD (Chemical Oxygen Demand, chemical oxygen demand) black liquor, sewage is difficult to treat, not to mention effective reuse; cold soaking pulping uses an underground soaking tank, injects a sufficient amount of liquid medicine, and pours raw materials into the tank Soak for about 48 hours, then take it out to refine the pulp, and squeeze it dry to make a pulp. The advantage is that no heating equipment is needed. The biggest disadvantage is that the medicine is wasted and it is difficult to reuse, because if the medicine is reused too many times, the medicine will be broken. The passivation effect leads to the decline of the drug effect of the liquid medicine, the difficulty of sewage treatment, high PH value, and high COD value; the spray method uses an above-ground pool to pile the raw materials into the pool, and then uses a special pump to spray the raw materials back and forth. In this way, the raw materials are softened, and then they are refined one by one and squeezed dry to shape. Compared with the cold soaking method, this method saves chemicals to the greatest extent. Although the amount of medication is reduced, it is prone to uneven soaking of raw materials, resulting in uneven raw and ripe pulp, which is serious. Affect pulp quality

[0003] The name of the Chinese patent is: clean pulping catalyst and its application process, and the announcement number is: 1216203C. The method of soaking raw materials results in a very high residual alkali content after pulping, which intensifies the pressure of subsequent pulp washing and increases the water consumption

At the same time, raw materials are soaked in high-temperature liquid medicine for a long time instead of pre-soaked, most of the unnecessary harmful components in the raw materials are dissolved, resulting in a high content of harmful components in the finished product and waste liquid, and the quality of the slurry, especially the strength of the finished product, decreases. Long, the finished pulp is prone to mildew, green and smelly, emits an unpleasant sour smell, and the extruded sewage is black and sticky, which seriously affects the normal use of the pulp in the paper mill and increases the water treatment load of the paper mill

Images