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Bagasse alkaline pulping method by pre-extracting hemicellulose and product thereof

A technology of hemicellulose and alkali pulping, which is applied in the directions of pulping with inorganic alkalis, fiber raw material treatment, chemical instruments and methods, etc., to achieve the effects of saving resources, huge social benefits, and considerable economic benefits

Inactive Publication Date: 2009-10-28
上海士林纤维材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no complete technical plan for the comprehensive utilization of bagasse that fully considers the extraction of xylan and fiber pulping

Method used

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  • Bagasse alkaline pulping method by pre-extracting hemicellulose and product thereof
  • Bagasse alkaline pulping method by pre-extracting hemicellulose and product thereof
  • Bagasse alkaline pulping method by pre-extracting hemicellulose and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) bagasse is prepared, and bagasse is depitted and washed;

[0051] (2) Pre-extraction: carried out in steamed balls, the extraction solvent is sodium hydroxide solution, the amount of alkali used is 3%, the solid-to-liquid ratio is 1:3, and the pre-extraction temperature is 140 ° C. The time is 45 minutes, the incubation time is 80 minutes, and the pH value at the end of the reaction is 6.5;

[0052] (3) Liquid-solid separation and washing, collecting the filtrate to obtain an extract: the extraction rate of bagasse organic matter is 8.1%;

[0053] (4) Residue alkaline cooking and pulping: to the initial depitting and dry bagasse, in terms of NaOH, the amount of alkali used is 12%, the solid-to-liquid ratio is 1:3, the cooking temperature is 164 ° C, and the heating time is 50 minutes. The heat preservation time is 30 minutes, and the bagasse coarse pulp is obtained, the yield of the coarse pulp is 51-53%, and the hardness is KMnO 4 The value is 10-12, and the resi...

Embodiment 2

[0055] (1) bagasse is prepared, and bagasse is depitted and washed;

[0056] (2) Pre-extraction: carried out in steamed balls, the extraction solvent is sodium hydroxide solution, the amount of alkali used is 3%, the solid-to-liquid ratio is 1:3, and the pre-extraction temperature is 160 ° C. The time is 50 minutes, the incubation time is 20 minutes, and the pH value at the end of the reaction is 5.9;

[0057] (3) Liquid-solid separation and washing, collecting the filtrate to obtain an extract: the extraction rate of bagasse organic matter is 10.3%;

[0058] (4) Residue alkaline cooking and pulping: to the initial depitting and dry bagasse, in terms of NaOH, the amount of alkali used is 12%, the solid-to-liquid ratio is 1:3, the cooking temperature is 164 ° C, and the heating time is 50 minutes. The holding time is 20 minutes, and the bagasse coarse pulp is obtained, the yield of the coarse pulp is 51-53%, and the hardness is KMnO 4 The value is 10-12, and the residual alka...

Embodiment 3

[0060] (1) bagasse is prepared, and bagasse is depitted and washed;

[0061] (2) Pre-extraction: carried out in a hydrolyzer, the extraction solvent is sodium hydroxide solution, and the amount of alkali used is 3%, the solid-liquid ratio is 1:5, and the pre-extraction temperature is 160° C. The time is 50 minutes, the incubation time is 20 minutes, and the pH value at the end of the reaction is 5.9;

[0062] (3) Liquid-solid separation and washing, collecting the filtrate to obtain an extract: the bagasse organic matter extraction rate is 10.7%;

[0063] (4) Residue alkaline cooking and pulping: for the initial depitting and dry bagasse, in terms of NaOH, the amount of alkali used is 12%, the degree of sulfidation is 15-20%, the solid-liquid ratio is 1:3, and the cooking temperature is 159 ℃, the heating time is 90 minutes, and the holding time is 15 minutes, the bagasse coarse pulp is obtained, the yield of the coarse pulp is 51-53%, and the hardness is KMnO 4 The value is...

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Abstract

The invention relates to a bagasse alkaline pulping method by pre-extracting hemicellulose and a product thereof; the method includes the following steps of: preparing bagasse: depithing and washing the bagasse; pre-extraction, in which the extracted solvent is sodium hydroxide solution and the technical condition comprises an alkaline content of 1-8percent, a solid-to-liquid ratio of 1:2.5-8.0, extraction temperature of 80-180 DEG C, heating-up time of 10-120 minutes, holding time of 0-120 minutes, a pH value of 4.5-6.9 at a reaction end point, and the pressure of saturated steam pressure at corresponding temperature; liquid solid separation and washing: collecting filtrate to produce extract; and preparing the pulp by residue alkaline process. In the invention, bagasse extract capable of extracting xyio-oligosacchandes, and the like and bagasse rough pulp for preparing whitened chemical pulp can be obtained; with a pre-extraction procedure added before stewing, the unscreened yield and hardness of bagasse are equivalent to that of pure pulping without pre-extraction by controlling the pre-extraction and stewing technical condition; bagasse biological refining on a pulping basis is realized; and the cost for pulping and pre-extracting hemicellulose is reduced, thereby saving resources.

Description

technical field [0001] The invention relates to the fields of chemical engineering and pulping technology, in particular to a bagasse alkaline pulping method for pre-extracting hemicellulose and a product thereof. Background technique [0002] Bagasse is a by-product of the sugarcane sugar industry and an excellent fiber raw material for pulping and papermaking. In the known technology of bagasse soda pulping, the bagasse is cooked by caustic soda or sulfate to dissolve the lignin and separate the fibers into pulp. Bleached chemical pulp is produced by washing, screening and bleaching. [0003] During the cooking process, the hemicellulose pentosan in the bagasse is partially dissolved and enters the black liquor, where it is burned and converted into heat energy during the alkali recovery process. In fact, the calorific value of carbohydrates such as pentosan is only half that of lignin, and the utilization value of thermal conversion is not high. [0004] In recent years...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C1/04D21B1/04D21C1/00D21C7/00D21H11/12D21H11/02C08B37/14C07H3/02C07H3/06C07H7/033C07H1/00C07G1/00C07C53/08C07C31/08C07C31/18
Inventor 吴学东陈惠敏王永东
Owner 上海士林纤维材料有限公司
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