A method for cleaning membrane organic solvent pollutants
A technology of organic solvents and pollutants, applied in the field of membrane cleaning, can solve the problems of reducing the service life of nanofiltration membranes, membrane damage, membrane pollution, etc., and achieve the effect of short cleaning time and good cleaning effect
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Embodiment 1
[0023] After the mixture of rice bran oil and acetone is separated by the membrane, the nanofiltration membrane is cleaned:
[0024] (1) Cleaning of solute pollutant rice bran oil: first clean with the same organic solvent acetone as the organic solvent used in the application of membrane production, the cleaning process is: first empty the mixture of rice bran oil and acetone in the nanofiltration membrane device , add the same organic solvent acetone as the organic solvent used in the application of film production, at 0.3kg / cm 2 Under the pulse frequency of / min, the membrane pressure of the nanofiltration membrane device rises from low pressure to high pressure. 2 The pulse frequency of / min drops from the high pressure state to the low pressure state, and maintains in the low pressure state for 2 minutes, and takes this as a cycle, and circulates for 20 minutes; the low pressure state is 2kg / cm 2 , the high pressure state is 18kg / cm 2 ;
[0025] (2) Cleaning of organic...
Embodiment 2
[0031] After the mixture of soybean oil and n-hexane is separated by membrane, the nanofiltration membrane is cleaned:
[0032] (1) Cleaning of solute pollutant soybean oil: first clean with the same organic solvent n-hexane as the organic solvent used in the production of the applied membrane, the cleaning process is: first empty the soybean oil and normal hexane in the nanofiltration membrane device The mixture, adding the same organic solvent n-hexane as the organic solvent used in film production, at 0.2kg / cm 2 Under the pulse frequency of / min, the membrane pressure of the nanofiltration membrane device rises from low pressure to high pressure. 2The pulse frequency of / min drops from the high pressure state to the low pressure state, and maintains in the low pressure state for 2 minutes, and takes this as a cycle, and circulates for 20 minutes; the low pressure state is 2kg / cm 2 , the high pressure state is 18kg / cm 2 ;
[0033] (2) Cleaning of organic solvent pollutant...
Embodiment 3
[0039] After the mixture of tuna oil and n-heptane is separated by membrane, the nanofiltration membrane is cleaned:
[0040] (1) Cleaning of solute pollutant tuna oil: first clean with the same organic solvent n-heptane as the organic solvent used in the production of the applied membrane, and the cleaning process is: first empty the tuna oil and n-heptane in the nanofiltration membrane device Mixture of alkanes, add the same organic solvent as the organic solvent used in the production of the film, at 0.3kg / cm 2 Under the pulse frequency of / min, the membrane pressure of the nanofiltration membrane device rises from low pressure to high pressure. 2 The pulse frequency of / min drops from the high pressure state to the low pressure state, and maintains in the low pressure state for 2 minutes, and takes this as a cycle, and circulates for 20 minutes; the low pressure state is 2kg / cm 2 , the high pressure state is 16kg / cm 2 ;
[0041] (2) Cleaning of organic solvent pollutant...
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