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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  • Description
  • Claims
  • Application Information

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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, and some methods adopt the method of adding additives and heating, evaporating and concentrating the waste lye, the process is complicated and energy-consuming Big

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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Embodiment 1

[0016] Example 1 Recovery of spent caustic liquor after alkaline washing of glutamic acid decolorization column

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

[0018] Collect 200Kg of pigment-containing waste lye at a temperature of 50° C., which contains 4.5% NaOH, 0.5% pigment, and a small amount of activated carbon particles and other impurity components. The membrane pore size is 200nm and the membrane area is 1m 2 The ceramic tubular membrane with a membrane pore size of 0.6nm and an area of ​​8m 2 The nanofiltration coiled membrane is combined into a two-stage membrane separation device, and the process is shown in the attached figure. Such as figure 2 As shown, the pigment-containing waste lye and the large-pore ceramic membran...

Embodiment 2

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

[0021] Cephalosporin C fermentation broth is filtered through ceramic membranes to remove mycelia and macromolecular impurities, and then refined through pre-adsorption columns, macroporous adsorption columns, and ion-exchange adsorption columns. When each adsorption column is regenerated, 2% to 5% sodium hydroxide solution is used for elution.

[0022] Take 213Kg of mixed eluent, the temperature is 40°C, the NaOH content is 4%, and the pigment content is 0.5%. The membrane with a pore size of 0.6nm and an area of ​​8m 2 A nanofiltration roll-type membrane separation device, filtered for 2 hours, obtained 198Kg of sodium hydroxide solution from which the pigment and suspended impurities were removed, and about 15Kg of the 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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