Liquid rotary type continuous extraction process and device

Abstract

The invention discloses a liquid rotary type continuous extraction process comprising the following steps: a. adding and mixing materials: powder materials are continuously added into a mixing tank to be fully stirred and mixed with extract liquor separated from a cyclone; b. rotary liquid extraction: the mixed materials pass through a static mixer and enter multiple groups of cyclone extractors for extraction; the extraction time can be controlled between 10min and 30min; the solvent ratio (weight ratio of the materials to a solvent) is 1:2-5; the solvent is hexane, ethanol or acetone; c. solvent evaporation: extracted mixed liquor passes through a combined evaporator formed by a falling film parallel tube evaporator and a stripping tower to obtain an extract; d. solvent recovery: the evaporated solvent is cooled and recovered in a condenser; e. material desolvation, drying and recovery: the extracted materials are first filtered by a leaf filter, then dried twice by a steam pneumatic drier and a steam jacketed type helical drier respectively and further desorbed to recover the solvent therein. The process solves the difficult problem of blockage of powder materials generally in the extractors.

Description

technical field [0001] The invention belongs to the technical field of extraction and recovery technology, and mainly relates to a cyclonic continuous extraction process and device, which is suitable for the extraction and recovery of powdery materials. Background technique [0002] The extraction of powdery materials has always been a difficult problem. Most solid-liquid extractions use filter or immersion extractors, which are often impossible to achieve due to the difficulty of penetrating the solvent of the powdery materials. Because the particle size of the powdery materials is too small, such as the particle size of decolorized clay reaches 200 mesh / inch. Such fine materials, once sprayed by solvent, will be washed under the screen, causing serious blockage accidents and making the extraction operation unable to continue. For this reason, so far, the extraction of powdery materials is limited to granulation and then carried out. Granulation first is also an extractio...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a cyclone continuous extraction process and device for the problems existing in the above-mentioned prior art, which solves the difficult problem of extraction clogging of powdery materials in general extractors.

Images