System and method for concentrating organic solvent

Abstract

The invention discloses a system and method for concentrating an organic solvent. The system comprises a forward osmosis assembly and a concentration osmosis assembly; the forward osmosis assembly comprises a forward osmosis membrane with an organic solvent resistance function, a raw material side input end, a raw material side output end, an osmosis side output end and an osmosis side input end,wherein the raw material side input end and the raw material side output end are arranged on the raw material side of the forward osmosis membrane, and the osmosis side output end and the osmosis sideinput end are arranged on the osmosis side of the forward osmosis membrane; an organic solvent to be concentrated is input into the raw material side input end; a concentrated organic solvent is output from the raw material side output end; an output diluted extracting solution is input into the concentration osmosis assembly through the osmosis side output end; and the concentrated extracting solution is input into the osmosis input end through the concentration osmosis assembly; the organic solvent is concentrated through the forward osmosis membrane; the moisture of the organic solvent isextracted through the extracting solution, and meanwhile the extracting solution is concentrated to be recycled. Raw materials only need to be pumped into the forward osmosis membrane for separation,so that the concentration of the organic solvent is realized, and cleaning is easy. With the system and the method adopted, energy consumption is extremely low, and use safety is improved.

Description

technical field [0001] The invention relates to the technical field of organic solvent concentration, in particular to a system and method for concentrating organic solvents. Background technique [0002] There are three methods for organic solvent concentration: high-temperature thermal evaporation, high-pressure nanofiltration or high-pressure reverse osmosis. At present, the high-temperature thermal evaporation is commonly used, and the evaporation temperature of different components is used to achieve concentration and purification. The energy consumption of the above-mentioned method High, the system is complex, the equipment investment is high, and there are certain safety hazards in the high-temperature process. The equipment investment cost is expensive and the energy consumption is high. [0003] Forward osmosis (FO) is different from traditional membrane technologies driven by external pressure (such as reverse osmosis RO and nanofiltration NF). The forward osmosi...

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Problems solved by technology

[0002] There are three methods for organic solvent concentration: high-temperature thermal evaporation, high-pressure nanofiltration or high-pressure reverse osmosis. At present, the high-temperature thermal evaporation is commonly used, and the evaporation temperature of different components is used to achieve concentration and purification. The energy consumption of the above-mentioned method High, complex system, high equipment investment, and there are certain safety hazards in the high-temperature process. Equipment investment costs are expensive and energy consumption is high

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