Process for concentrating soy isoflavone in soy protein waste water by foam separation method

A technology for concentrating soybean protein and soybean isoflavones, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The problem of high equipment cost, to achieve the effect of operation pollution, simple operation and simple equipment

Active Publication Date: 2012-12-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to invent a process for concentrating soybean isoflavones in soybean protein wastewater by foam separation. This process has a good pretreatment effect on soybean protein wastewater, that is, it can not only effectively remove Part of soybean protein in protein wastewater can effectively concentrate soybean isoflavones. This invention overcomes the defects of other technologies such as high equipment cost, complicated operation process, inability to effectively concentrate soybean isoflavones and easy environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first step is the collection and detection of wastewater generated from the production of soybean protein

[0025] Collect the wastewater produced by the production of soybean protein, and use three-wavelength ultraviolet spectrophotometry to detect (the following examples are the same) that the concentration of soybean isoflavones in the wastewater is 0.20g / L, and the pH is 4.5;

[0026] The second step, the pH adjustment of the wastewater produced by the production of soybean protein

[0027] Use sodium hydroxide aqueous solution (1mol / L) to adjust the pH of the wastewater produced in the production of soybean protein described in the first step to 5.5-5.8 as the initial wastewater, and use it as the first-stage foam separation in the following three-stage foam separation process Feed;

[0028] The third step, three-stage foam separation process

[0029] The first-stage foam separation process: the temperature of the foam separation tower is set at 50-55°C, the ...

Embodiment 2

[0035] The first step is the collection and detection of wastewater generated from the production of soybean protein

[0036] Collect the wastewater produced by the production of soybean protein, the concentration of soybean isoflavones in the wastewater is 0.30g / L, and the pH is 4.5;

[0037] The second step, the pH adjustment of the wastewater produced by the production of soybean protein

[0038] Use sodium hydroxide aqueous solution (1mol / L) to adjust the pH of the wastewater produced in the production of soybean protein described in the first step to 5.9-6.2 as the initial wastewater, and use it as the first-stage foam separation in the following three-stage foam separation process Feed;

[0039] The third step, three-stage foam separation process

[0040] The first-stage foam separation process: the temperature of the foam separation tower is set at 56-60°C, the superficial gas velocity is 0.7-0.8mm / s, the height of the foam layer is 0.68-0.73m, and the foam flowing ou...

Embodiment 3

[0045] The first step is the collection and detection of wastewater generated from the production of soybean protein

[0046] Collect the wastewater produced by the production of soybean protein, the concentration of soybean isoflavones in the wastewater is 0.40g / L, and the pH is 4.5;

[0047] The second step, the pH adjustment of the wastewater produced by the production of soybean protein

[0048] Use sodium hydroxide aqueous solution (1mol / L) to adjust the pH of the wastewater produced in the production of soybean protein described in the first step to 6.3-6.5 as the initial wastewater, which is used as the first stage of foam separation in the following three-stage foam separation process Feed;

[0049] The third step, three-stage foam separation process

[0050] The first-stage foam separation process: the temperature of the foam separation tower is set at 61-65°C, the superficial gas velocity is 0.9-1.0mm / s, the height of the foam layer is 0.75-0.80m, and the foam flow...

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Abstract

The invention relates to a process for concentrating soy isoflavone in soy protein waste water by a foam separation method. The process comprises the following steps of: (1) collecting and detecting waste water generated by producing soy protein; (2) regulating the pH of the waste water generated by producing the soy protein; and (3) carrying out three-stage foam separation. According to the process, the concentration ratio (the concentration ratio of the soy isoflavone is 5.8-11.0) of the soy isoflavone not only can be greatly improved, but also the recovery rate (the recovery rate of the soy isoflavone is 80-90 percent) can be increased.

Description

technical field [0001] The technical proposal of the present invention belongs to the field of waste water treatment, specifically a process for concentrating soybean isoflavones in soybean protein waste water by means of a foam separation method. Background technique [0002] Soybean isoflavones are a class of non-sterol substances with health-promoting effects, which can be used as natural antioxidants and additives with health-care functions, and have high medicinal value. The industry mainly adopts organic solvent extraction method to obtain soybean isoflavones from soybean or soybean meal, but soybean isoflavones dissolved in soybean protein wastewater have not been paid enough attention. In the process of producing soybean protein by alkali-soluble acid precipitation in China, a large amount of soybean isoflavones will be dissolved in the wastewater produced by soybean protein production. Direct discharge will not only cause serious pollution to the environment, but al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D311/36C07D311/40C02F9/08
Inventor 吴兆亮刘伟李瑞
Owner HEBEI UNIV OF TECH
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