Pleietrepie counter current falling film evaporator of organic solvent recycle

Abstract

The invention provides a multiple effective reflux falling film evaporation system used for recycling organic solvent. The invention is mainly used for recycling the solvent in water solution of the organic solvent during the concentration production process of plant extractions in food industry and biopharmaceutical industry. The invention adopts falling film evaporators with high heat transmission coefficient and small terminal temperature difference to form the multiple effective evaporation system. Each evaporator is provided with a solution circulating pump which increases down-flow quantity in a heat transfer tube and avoids dry wall of a heat transfer surface and enhances heat transferring, thus having great evaporation ability and high efficiency. The condensate of each evaporator enters into a corresponding condensate tank respectively and is discharged by the pump and recycled. A gas-phase communicating pipe is arranged between the condensate tank and a gas-liquid separator, which guarantees the discharge of noncondensable gas under vacuum operation condition, thus being beneficial for improving condensing and heat transferring efficiency. The invention is a new technique, new technology and new device used in concentration process of the extractions of the organic solvent and used for recycling solvent, which has high recycling rate, little energy consumption and convenient operation and can use a vacuum low temperature evaporation concentration production device in continuous and intermittent production operation.

Description

technical field [0001] The invention relates to a new process, a new technology and a new device for recovering organic solvents by using a multi-effect countercurrent falling film evaporation system in the field of chemical engineering. It is mainly used for solvent recovery in the process of evaporation and concentration of plant extracts in organic solvent aqueous solutions, and at the same time to obtain concentrated solutions or crystallized products. Background technique [0002] Active ingredients are extracted from plant resources, with various varieties and different properties. These active ingredient extracts are often raw materials for functional foods, cosmetics and biopharmaceuticals. [0003] For plant extraction, solvent water or organic solvents such as ethanol, ether, acetone, petroleum ether, etc. should be selected as the extractant according to the nature of the active ingredients in the plant. According to the nature of the extract and the selectivity...

AI Technical Summary

Problems solved by technology

[0008] 3. If this kind of evaporator is not made into multi-effect, single-effect evaporator consumes a lot of energy and consumes a lot of cooling water

[0010] 5. The use of this external circulation multi-effect downstream evaporator cannot be used for evaporation and concentration of aqueous organic solvent extracts

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