Method for recycling sodium hydroxide from pigment containing alkali waste liquid

A technology of sodium hydroxide and waste lye, applied in the direction of alkali metal oxides/hydroxides, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of large energy consumption and complicated process, and achieve simple process and low cost Significant effect on governance costs, economic and social benefits

Inactive Publication Date: 2006-02-22
JIANGSU JIUWU HITECH
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Problems solved by technology

In the above-mentioned various methods, some waste lye is different from the composition of the pigment-containing waste lye concerned by the present invention, a

Method used

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  • Method for recycling sodium hydroxide from pigment containing alkali waste liquid
  • Method for recycling sodium hydroxide from pigment containing alkali waste liquid

Examples

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Example Embodiment

[0016] Example 1 Recovery of waste lye after alkaline washing of glutamic acid decolorizing column

[0017] After the glutamic acid is adsorbed and decolorized by powdered activated carbon, it is decolorized by a granular activated carbon adsorption column. The adsorption column is washed and regenerated with 5% sodium hydroxide solution, and the sodium hydroxide waste liquid is collected.

[0018] Collect 200Kg of waste lye containing pigment at a temperature of 50°C, which contains 4.5% of NaOH, 0.5% of pigment, and a small amount of activated carbon particles and other impurities. The membrane pore size is 200nm and the membrane area is 1m 2 The ceramic tubular membrane and the membrane pore size is 0.6nm and the area is 8m 2 The nanofiltration roll membrane is combined into a secondary membrane separation device. The process is shown in the attached drawing. Such as figure 2 As shown, the waste lye containing pigment and the large-pore ceramic membrane continuously circulate t...

Example Embodiment

[0020] Example 2 Recovery of waste lye after alkaline washing of cephalosporin C adsorption column

[0021] After the cephalosporin C fermentation broth is filtered through a ceramic membrane to remove mycelium and macromolecular impurities, it is refined through a pre-adsorption column, a macroporous adsorption column, and an ion exchange adsorption column. Each adsorption column is eluted with 2% to 5% sodium hydroxide solution during regeneration.

[0022] Take 213Kg of mixed eluent, temperature 40℃, NaOH content 4%, pigment content 0.5%. The membrane has a pore size of 0.6nm and an area of ​​8m 2 The nanofiltration roll membrane separation device is filtered for 2h to obtain 198Kg of sodium hydroxide solution from which pigment and suspended impurities are removed, and about 15Kg of residual pigment concentrate.

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Abstract

The invention relates to a method to recycle sodium-hydroxide from waste lye contained pigment. Wherein, collecting the said lye into storage tank that connects with membrane separation device by pipes and forms circulatory system; compressing by pump to force the lye circulated flow between the tank and membrane; the out flow filtrate is NaOH solution; with the out flow of filtrate, the pigment in original solution is enriching till the end of separation; the separation device uses ceramics, stainless steel membrane or organic membrane with bore diameter 0.3nm-800nm. This method needs no other auxiliary agent.

Description

technical field [0001] The invention relates to a method for recovering sodium hydroxide in waste lye containing pigments by membrane separation technology. Background technique [0002] In some production fields that contain adsorbent depigmentation process, sodium hydroxide lye is used for the regeneration of adsorbent, resulting in a large amount of spent lye containing pigment. For example, in the field of domestic biological fermentation, adsorbents are used for product refining, and the amount of various waste lye containing pigments produced for the regeneration of adsorbents reaches tens of millions of tons; in the production of monosodium glutamate using glutamic acid as raw material, ion Exchange resin and activated carbon adsorbent are refined and decolorized. For every ton of monosodium glutamate produced, only the regeneration of granular activated carbon adsorbent needs to consume about 0.6 tons of lye with a concentration of 5%. The domestic industry produces ...

Claims

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Application Information

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IPC IPC(8): C02F1/44C01D1/28
Inventor 徐南平杨刚邢卫红
Owner JIANGSU JIUWU HITECH
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