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Alkaline method for zero-residual alkaline boiling pulp making method

A technology for pulping and residual alkali, applied in the field of papermaking and pulping, can solve the problems of high operating costs and large investment in alkali recovery technology, and achieve the effects of saving production costs, high cooking efficiency and high calorific value.

Inactive Publication Date: 2008-05-28
晏永祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of huge investment and high operating costs in the existing alkali recovery technology, and to provide a new technology of alkaline cooking and pulping, so that there is no residual alkali in the pulping black liquor, which is convenient for black liquor treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] To 1000g of broken and dust-removed reeds, add 300ml of alkali solution with a temperature of 80°C and a concentration of 5%. After fully stirring, keep warm and pre-soak for 2 hours, then remove the free alkali solution, add catalyst A, stir evenly, and then add Cook in a cooking pot. The cooking pressure is 1.3-1.5Mpa, the cooking time is 10-30min, the slurry concentration is 20-25%, the pH value of the slurry is 6.5-7.5, the pH value of the black liquor is 6.5-7.5, and the mass dosage of catalyst A is 2%. : Sodium sulfite 1.6%, magnesium hydroxide and sodium silicate 0.2% each. Afterwards, the refining and papermaking process is the same as the conventional process. The beating degree of pulping is 38 degrees. It is mixed with domestic waste paper pulp to make high-strength corrugated base paper. The proportion of reed pulp is 20% (mass ratio). Meet the standard of GB13023-91A grade corrugated base paper.

Embodiment 2

[0031] In 1000g of broken and dust-removed cotton stalks, add 300ml of alkali solution with a temperature of 80°C and a concentration of 4%. After fully stirring, keep warm and pre-soak for 4 hours, then remove free alkali, add catalyst A, stir evenly, and then Add to cooking pot to cook. The cooking pressure is 1.2-1.4Mpa, the cooking time is 30-60min, the slurry concentration is 20-25%, the pH value of the slurry is 6.5-7.5, the pH value of the black liquor is 6.5-7.5, and the mass dosage of catalyst A is 4%. Anthraquinone 0.1%, sodium sulfite 3.5%, potassium hydroxide 0.3% and urea 0.1%. The pulping and papermaking part is the same as the conventional process, the beating degree of pulping is 35 degrees, and the high-strength corrugated base paper is blended with domestic waste paper pulp, and the proportion of cotton straw pulp is 30%, and the quality indicators of the finished paper all reach GB13023-91A level Standard for corrugated base paper.

Embodiment 3

[0033] Add 300ml of alkali solution with a temperature of 80°C and a concentration of 6% to 1000g of broken and dedusted bamboo chips, stir well, keep warm and pre-soak for 5 hours, then remove free alkali, add catalysts A and B, and stir evenly , and then added to the cooking pot for cooking. The cooking pressure is 1.0-1.3Mpa, the cooking time is 60-90min, the slurry concentration is 20-25%, the pH value of the slurry is 6.5-7.5, the pH value of the black liquor is 6.5-7.5, and the mass dosage of catalyst A is 3%. : 0.15% of anthraquinone, 2.7% of sodium sulfite and 0.15% of magnesium hydroxide, the mass consumption of catalyst B is 2.5%, wherein: 2% of hydrogen peroxide, 0.5% of sulfamic acid. The refining and papermaking process is the same as the conventional process. The beating degree of pulping is 42 degrees. After beating, 80g kraft paper is produced. The quality indicators of the finished paper all meet the requirements of QB / T3516-1999 standard A-grade paper.

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Abstract

The invention relates to an alkali boiling pulping process with zero alkali remains and discloses a new technique for the alkali boiling pulping process with zero alkali remains, which charges catalyzer A or both catalyzer A and B in the pulping process to leave no alkali remains in the black liquid in the pulping process and the obtained paper pulp can meet the paper-making requirement, wherein the catalyzer A is one or several kinds of magnesium hydrate, potassium hydrate, sodium silicate, sodium sulfite, ammonium sulfite and carbonyldiamide, the catalyzer B is one or several kinds of hydrogen peroxide, sodium hypochlorite, calcium hypochlorite and amidosulfonic acid. The process releases the paper making factory from large investment on a huge alkali recycling program and the black liquid facilitates the process of the organic fertilizer with good quality which can be widely applied.

Description

technical field [0001] The invention belongs to the technical field of papermaking and pulping, and in particular relates to a new pulping technology for making pulping black liquor free of residual alkali. Background technique [0002] After alkaline pulping, a large amount of fiber and non-fibrous raw materials and most of the alkaline substances are dissolved in the cooking liquor to become black liquor, which is the largest source of pollution in the paper industry. At present, large-scale papermaking enterprises at home and abroad mostly use traditional alkali recovery technology to treat black liquor. This technology is more effective in reducing environmental pollution caused by the paper industry. However, the one-time investment of traditional alkali recovery technology is huge, and it generally takes The investment is tens of millions of yuan, and the daily operating costs are quite high. Therefore, many small and medium-sized pulp and paper mills in my country cann...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C1/10D21C7/00D21H17/64D21H17/66D21H17/07D21H17/14D21H17/05
Inventor 晏永祥
Owner 晏永祥
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