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Method for treating pulping black liquor through alkali cooking method taking gramineous plants as materials

A technology for gramineous plants and pulping black liquor, which is applied in the regeneration of lye, can solve problems such as unreasonable processing technology, and achieve the effects of low cost, low price and reduction of carbon dioxide emissions.

Inactive Publication Date: 2014-11-19
广西星岛科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of processing method of the black liquor of alkali cooking method pulping with gramineous plants as raw material, to solve the above-mentioned drawbacks caused by the unreasonable treatment process of existing papermaking black liquor with gramineous plants as raw materials, the The process is simple, easy to operate, fully utilizes waste resources, and can maximize the use of lignin in black liquor for high value-added development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The pulp black liquor treatment method of pulping with bagasse as raw material by alkaline cooking method:

[0038]In this example, the research and development team of Guangxi Xingdao Science and Technology Development Co., Ltd. carried out the following treatment process on the black liquor of alkaline cooking pulping with bagasse as raw material in the paper mill of Guangxi Guitang (Group) Co., Ltd.:

[0039] After testing, the content of CODcr in pulp black liquor made from bagasse as raw material and sodium hydroxide as alkaline cooking agent is 350000mg / L; the content of BOD5 is about 135000mg / L, the content of lignin is 13.4%, and the content of inorganic substances is 22.1%. Polysaccharides are 17.1% and the pH is 13.

[0040] Add 15% concentrated sulfuric acid to the pulping black liquor without adding any coagulant, adjust the pH of the black liquor to 2-3, and after standing for 56 hours, filter to obtain a precipitate, and the filtrate enters the treatment t...

Embodiment 2

[0044] The high-purity lignin product of the present invention obtained in Example 1 with a purity of 82% was used as a raw material to conduct research on lignin phenolic resin.

[0045] First, 1000g of high-purity lignin of the present invention, 1500g of water, and 500g of phenol are added in a 10-liter flask with a condenser and agitator, and then 37% formaldehyde is Amount is added wherein, then, 20% sodium hydroxide is slowly added wherein by the amount that is 0.48 with respect to the molar ratio of phenol sodium hydroxide. After all the sodium hydroxide was added, the temperature was raised, and the reaction was carried out at 70° C. for 5 hours to obtain a lignin phenolic resin with a concentration of 38%.

[0046] The obtained lignin phenolic resin is used as an adhesive to manufacture particleboard.

[0047] The raw material of the particle board is obtained by crushing construction wood waste, and the moisture content is 4%. The lignin phenolic resin with a solid ...

Embodiment 3

[0050] Using the low-molecular-weight lignin product with a purity of 12% obtained in Example 1, an evaluation test of a binder for turning the powder into granules was carried out, using coal powder and bitter earth lime powder.

[0051] Coal powder is the water that has added 5% by weight and 60% by weight of the lignin product of the present invention, and bitter earth lime powder is the water that has added 5% by weight and 40% by weight of the lignin product of the present invention, using a bread-type granulator A granulation test was carried out, and both powders formed granules with a diameter of 3-8mm, so the effect of the lignin product of the present invention as a binder has been confirmed.

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Abstract

The invention discloses a method for treating pulping black liquor through an alkali cooking method taking gramineous plants as materials. The black liquor discharged in the pulping process through the alkali cooking method taking the gramineous plants as the materials is turned into a useful lignin product. The treating process mainly comprises the steps as follows: recovering easily deposited macromolecular lignin as a high-purity lignin product by adding an acid into the black liquor, and recovering low-molecular-weight lignin not easily deposited under the acidizing condition, like a monomer or a biopolymer, as well as other components as a low-molecular-weight lignin product. The invention adopts the low-cost high-efficiency treatment method to treat the pulping black liquor, meanwhile, the obtained high-purity lignin product and the lignin product are respectively applied to synthetic resins and adhesives, the waste resources are fully utilized, the environment is protected, and the social and economic benefits are increased.

Description

technical field [0001] The invention relates to a treatment method for papermaking black liquor, in particular to a treatment method for pulping black liquor by alkali cooking method using gramineous plants as raw materials. Background technique [0002] Alkaline cooking pulp production using gramineous plants as raw materials is widely used in China and Southeast Asia. In the cooking process, the black liquor discharged after separation from pulp has become a serious environmental pollution problem. As a treatment method for pulp black liquor, when wood pulping, the black liquor is generally concentrated and burned as fuel, and then the cooking medicine is extracted from the burned ash for secondary use, but the pulping with gramineous plants as raw materials At the same time, due to the high content of silicon dioxide in the black liquor, it will adhere to combustion equipment, so it is hardly used. [0003] Recently, some factories have used gramineous plants as raw mate...

Claims

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Application Information

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IPC IPC(8): D21C11/04C08H7/00
Inventor 河野剛
Owner 广西星岛科技发展有限公司
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