A RDH cooking pulping process and system

Through the liquid phase multi-stage replacement cooking process using SO2 and ethanol, the problems of high cost and environmental pressure of traditional pulping processes are solved, and low-cost and efficient cellulose extraction and organic fertilizer production are achieved.

CN117513041BActive Publication Date: 2025-08-08SHIHEZI GUOLIYUAN ENVIRONMENTAL PROTECTION PULPING CO LTD
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Patent Information

Application Number
CN202311468259.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-07
Publication Date
2025-08-08
Estimated Expiration
2043-11-07

AI Technical Summary

Technical Problem

Traditional pulping processes have high costs and high environmental pressures, especially neutral and acidic sulfite pulping, which is difficult to bear in terms of environmental pressure and cost, resulting in difficulty in large-scale production.

Method used

The liquid phase multi-stage replacement and cooking process using SO2 as the cooking medicine and ethanol as the organic solvent medium includes black liquid replacement and dilute alkali treatment in multiple steps. Combined with special cooking, warm black liquid and dilute alkali unit equipment, it realizes efficient utilization and environmentally friendly recycling of drugs.

Benefits of technology

It significantly reduces the pulping cost, improves the cellulose extraction efficiency, generates high-quality organic fertilizer, reduces environmental protection pressure, and realizes the production of high-purity cellulose.

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Abstract

The present invention relates to an RDH cooking pulping process and a system thereof. An RDH cooking pulping process comprises the following steps: (1) adding SO2 chemicals and black liquor 1 to fiber raw materials, keeping the raw materials at 100-110°C for 25-35 minutes, and then using black liquor 2 to replace the black liquor 1 after the insulation; (2) keeping the raw materials at 140-150°C for 90-130 minutes, and then using black liquor 3 to replace the black liquor 2 after the insulation; the black liquor 3 is the black liquor 1 after the insulation replaced by the black liquor 2; (3) using dilute alkali solution to replace the warm black liquor 3, keeping the raw materials at 105-115°C until the pulp kappa number reaches 17-20; (4) using dilute black liquor to replace the dilute alkali solution after the insulation to obtain a coarse pulp. The RDH cooking pulping process and the system thereof of the present invention use SO2 as the cooking chemical and ethanol as the organic solvent medium, which significantly reduces environmental pressure while reducing costs and improving extraction efficiency.
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