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Waste alkali solution recycling method

A technology for waste lye and aqueous solution, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problem of inability to recover and recycle waste lye, and achieve energy saving. The effect of emission reduction, environmental protection and added value increase

Inactive Publication Date: 2015-10-28
HENAN UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
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Problems solved by technology

However, the membrane separation method is actually a process of concentrating hemicellulose in an aqueous alkali solution, which cannot completely recover and recycle the spent alkali liquor, and at least 30-50% of the spent alkali liquor must be treated by traditional methods

Method used

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  • Waste alkali solution recycling method

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Embodiment 1

[0021] 1. Pass the waste viscose fiber lye (containing about 4% hemicellulose and 20% sodium hydroxide) into the precipitation reactor, add hemicellulose precipitant, mix well, and let it stand for a period of time. After the solution is obviously stratified, the supernatant liquid is passed into the intermediate tank, and the supernatant liquid is removed to obtain a hemicellulose slurry.

[0022] 2. Put the hemicellulose slurry into the solid-liquid separator to separate the hemicellulose, wash and dry the solid hemicellulose, weigh and calculate the hemicellulose removal rate, the results are shown in Table 1. The filtrate and washing liquid are aqueous solutions containing precipitant and sodium hydroxide, which are passed into the intermediate tank and combined with the supernatant.

[0023] 3. Pass the aqueous solution containing precipitating agent and sodium hydroxide into the rectification tower, and realize the separation of lye and precipitating agent in the rectificati...

Embodiment 2

[0028] The above hemicellulose precipitation agent is an aqueous solution of methanol and polyferric sulfate in a ratio of 1000:1 parts by weight.

[0029] The steps are the same as in Example 1. The results are shown in Table 2.

[0030] Table 2 Results of removing hemicellulose by methanol precipitation

[0031] Waste lye: precipitation agent Hemicellulose removal rate / % Recovery rate of precipitation agent / % Recovery rate of lye / % 1:13599.8100 1:1.54599.6100 1:26099.5100 1:2.5 7599.5100 1:38599.5100 1:48599.5100 1:57599.6100

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Abstract

The invention belongs to the field of resource recycling and relates to a waste alkali solution recycling method, in particular to a method for cyclic utilization of waste alkali solutions in the viscose production process of chemical fiber factories. According to the waste alkali solution recycling method, hemicellulose is separated from the waste alkali solutions through a reaction unit, a solid-liquid separation unit and a rectification unit. Therefore, the waste alkali solutions can be completely recycled and cyclically utilized, meanwhile, the by-product hemicellulose can be obtained, the hemicellulose can be used as a raw material for producing furfural or xylose, and the additional value of waste liquor treatment is increased. Energy conservation and emission reduction are facilitated, environmental pollution is reduced, a large amount of caustic soda can be saved, and environmental protection is well facilitated.

Description

technical field [0001] The invention belongs to resource reuse, in particular to a method for recycling waste lye in the viscose fiber production process of a chemical fiber factory. Background technique [0002] Viscose fiber is one of the main chemical fiber varieties, and its output accounts for about one-third of the total global fiber output. It is estimated that my country's viscose fiber production capacity is about 3 million tons, and the annual output of viscose fiber accounts for about 60% of the world's total output. With the development of the global economy and the growth of population, the consumption of viscose fiber will continue to grow. The production process of viscose fiber includes 4 stages of viscose preparation, spinning, post-processing and post-processing. In the process of viscose preparation, a large amount of caustic soda is consumed and a large amount of waste lye is produced. The main components are water, NaOH And hemicellulose, in which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D1/28
Inventor 王天贵卫冉胡元森卫红伟潘茜
Owner HENAN UNIVERSITY OF TECHNOLOGY
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