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Membrane cleaning method in membrane-method sugar manufacturing technology

A technology of membrane cleaning and membrane method, applied in the field of membrane separation, can solve the problems of increasing sucrose cost, membrane flux attenuation, membrane fouling, etc., and achieve the goal of reducing alkali consumption and sodium hypochlorite consumption, maintaining stable operation, and restoring membrane flux Effect

Active Publication Date: 2019-04-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the composition of sugarcane mixed juice is complex, containing a large amount of denatured protein, pectin, paraffin, pigment, bacteria, dextran, cellulose, hemicellulose and lignin and other impurities, which will cause serious membrane pollution to membrane filtration systems at all levels , resulting in attenuation of membrane flux, and the fouling mechanisms of membranes at all levels are different, so it is difficult to use a unified cleaning method for pollutant removal
Moreover, cleaning will produce a large amount of membrane cleaning waste liquid, direct discharge will not only have a negative impact on the sewage treatment system, but also waste a large amount of chemical agents, increasing the cost of sucrose production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a method for membrane cleaning in the membrane sugar production process, said method comprising the steps of:

[0049] (a) Use deionized water to clean the clarified membrane at 35°C for 30 minutes, then use a sodium hydroxide solution with a pH of 11 to wash the clarified membrane at 35°C for 30 minutes, and then use sodium hydroxide and sodium hypochlorite with a pH of 11 and a sodium hypochlorite concentration of 200ppm Wash the clarified membrane with the mixed solution at 35°C for 30 minutes, and finally wash the clarified membrane with deionized water at 35°C for 30 minutes;

[0050] (b) Use deionized water to wash the decolorized membrane at 35°C for 30min, then use a dextranase solution with a concentration of 50ppm to wash the decolorized membrane at 35°C for 30min, and finally use a sodium hydroxide solution with a pH of 11 to wash the decolorized membrane at 35°C 30min;

[0051] (c) Wash the concentrated membrane with deionized water...

Embodiment 2

[0055] This embodiment provides a method for membrane cleaning in the membrane sugar production process, said method comprising the steps of:

[0056] (a) Use deionized water to clean the clarified membrane at 35°C for 30 minutes, then use a sodium hydroxide solution with a pH of 11 to wash the clarified membrane at 35°C for 30 minutes, and then use sodium hydroxide and sodium hypochlorite with a pH of 11 and a sodium hypochlorite concentration of 200ppm Clean the clarified membrane with the mixed solution at 35°C for 30 minutes, and finally use deionized water to wash the clarified membrane at 35°C for 20 minutes; the resulting clarified membrane cleaning waste liquid is treated with an ultrafiltration membrane with a molecular weight cut-off of 2000Da under the conditions of 9 bar and 35°C Obtain the ultrafiltration membrane permeate liquid, add sodium hydroxide and sodium hypochlorite in the ultrafiltration membrane permeate liquid to make the pH of the ultrafiltration membr...

Embodiment 3

[0063] This embodiment provides a method for membrane cleaning in the membrane sugar production process, said method comprising the steps of:

[0064] (a) Use deionized water to wash the clarified membrane at 32°C for 35min, then use a sodium hydroxide solution with a pH of 11.5 to wash the clarified membrane at 32°C for 35min, and then use sodium hydroxide and sodium hypochlorite with a pH of 11.5 and a sodium hypochlorite concentration of 150ppm The mixed solution was used to clean the clarified membrane at 32°C for 35 minutes, and finally, use deionized water to clean the clarified membrane at 32°C for 20 minutes; the resulting clarified membrane cleaning waste was treated with an ultrafiltration membrane with a molecular weight cut-off of 1500Da at 8 bar and 32°C Obtain the ultrafiltration membrane permeate liquid, add sodium hydroxide and sodium hypochlorite in the ultrafiltration membrane permeate liquid to make the pH of the ultrafiltration membrane permeate liquid be 11...

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Abstract

The invention belongs to the technical field of membrane separation, and relates to a membrane cleaning method in a membrane-method sugar manufacturing technology. The membrane cleaning method comprises the following steps: step (1) sequentially using deionized water, a sodium hydroxide solution, a mixed solution of sodium hydroxide and sodium hypochlorite and the deionized water to clean a clarification membrane; step (2) sequentially using the deionized water, a glucanase solution and the sodium hydroxide solution to clean a decolorizing membrane; and step (3) sequentially using the deionized water, the sodium hydroxide solution and the deionized water to clean a concentration membrane. The step (1) and the step (3) are not ordered. The membrane cleaning method in the membrane-method sugar manufacturing technology is customized for different pollution mechanisms of the clarification membrane, the decolorizing membrane and the concentration membrane, can effectively remove the membrane pollution, restores the membrane flux of each level, maintains the stable operation of a membrane-method cane sugar manufacturing system, and can reduce water consumption, discharge of wastewater and consumption of chemical reagents by recycling membrane cleaning waste liquid at all levels.

Description

technical field [0001] The invention belongs to the technical field of membrane separation and relates to a membrane sugar production process, in particular to a membrane cleaning method in the membrane sugar production process. Background technique [0002] At present, the sugarcane mixed juice cleaning section in the sugarcane sugar production process mainly adopts the sulfite method or carbonic acid method, which needs to add a large amount of chemical substances to remove non-sugar impurities in the sugarcane mixed juice, but the sulfite method and carbonic acid method have complex processes and decolorization. Low yield, unstable quality of finished sugar, and sulfur in products affect food safety and other issues. [0003] CN 103725802 A discloses a process for refining sucrose. The specific steps include sucrose juice extraction, pretreatment, membrane microfiltration, preconcentration, ion exchange decolorization, desalination, MVR (mechanical vapor recompression tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02C13B20/16
CPCB01D65/02B01D2321/164B01D2321/166B01D2321/168C13B20/165
Inventor 罗建泉万印华刘威杭晓风
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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