Electrocatalysis oxidation pulping method for purified cotton and production system equipment

Abstract

An electrocatalysis oxidation pulping method for purified cotton and production system equipment belong to the technical field of purified cotton production. The method adopts the technology that bales of cotton linter are opened by an opener and then are made into a linter quilt through a combined cotton feeding device, the linter quilt enters into an impregnating machine through double clamp belts, an on-site hydroxyl free radical active oxygen and oxygen preparing method is adopted to continuously supply a pulping agent, the linter quilt and a pulping assistant are fully impregnated and then enter into an electrocatalysis oxidized still, pulp enters into a retention reactor that is filled with steam with a certain pressure, produced half stuff enters into a replacement and washing section and an extrusion and drying stage, and purified cotton cellulose products are obtained after the drying operation. Through the adoption of the method and the production system equipment, the effects of no black liquor, resource economy and energy consumption reduction can be achieved in the pulping process; and the pulping yield is high while clean and continuous pulping can be realized.

Description

technical field [0001] The invention relates to the technical field of refined cotton production, in particular to a refined cotton electrocatalytic oxidation pulping method and production system equipment. Background technique [0002] Refined cotton is a kind of cellulose material produced by high-temperature alkaline pulping with cotton linters as the main raw material, and has the function of thickening and shaping. It is the main material for the manufacture of ether cellulose (such as CMC, HEC, HPMC, MC, etc.), nitrocellulose (nitrocellulose) and cellulose acetate, and is widely used in food, medicine, daily chemicals, plastics, electronics, papermaking , metallurgy, aerospace and many other fields, known as "special industrial monosodium glutamate". [0003] Refined cotton production has a history of several decades in our country. Domestic refined cotton production mainly uses cotton linters as raw materials, using alkaline cooking, sodium hypochlorite bleaching (so...

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Problems solved by technology

[0003] Refined cotton production has a history of several decades in our country. Domestic refined cotton production mainly uses cotton linters as raw materials, using alkaline cooking, sodium hypochlorite bleaching (some also use chlorine dioxide or chlorine gas pipeline chlorination), pressing and flooding. However, the traditional alkaline pulping process of domestic alkaline cooking and sodium hypochlorite bleaching has the following main problems: first, the pollution is very serious, and high-temperature alkaline cooking will produce a large amount of pulping black liquor. The concentration of liquid organic matter is high, and CODcr is as high as 20,000mg / L; the second is that the pulping yield is low, the color is uneven, and the post-treatment processes such as bleaching with sodium hypochlorite, dechlorination, and acid treatment consume a lot of water, and the water consumption per ton of product reaches 150 to 200 tons. , and produce a large amount of sewage; the third is that the traditional pulping process is an intermittent production process, the equipment is backward, the cooking time is as long as 6-7 hours, and the production efficiency is low

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