Continuous extraction device and technique

Abstract

The invention provides a continuous extraction device and technique. The continuous extraction device comprises an extraction tank with a closed main body, wherein a plurality of oblique scraper devices are mounted in the extraction tank, an extraction material inlet and a solvent inlet are formed in different positions on the upper part of the extraction tank, and an extract liquor outlet and an extraction material outlet are respectively formed in the two ends of the extraction tank. The invention further provides the associated extraction technique. A plurality of oblique scraper stirring conveyers are arranged in the continuous extraction device and can regulate the stirring strength and the conveyance speed according to the characteristics of extraction materials so as to control the extraction time without limit to the shapes and the grain sizes of the extraction materials; the permeation is not influenced by the stacking of the materials, and the extraction materials and a solvent reversely flow and are continuous extracted without dead angles in full contact, so that the extraction is completely highly efficient.

Description

technical field [0001] The invention relates to an extraction device, in particular to a continuous extraction device used in the field of vegetable oil and medicine and chemical industry. Background technique [0002] In the process of extracting large-scale plant oils and active ingredients in pharmaceutical and chemical industries, large-scale continuous extraction devices must be used. At present, large-scale continuous extraction devices consist of circular flat-rotating extractors, ring-type extractors, and box-type towline extractors. Although the extractors all have the function of continuous extraction, the extracted materials are placed on the screen with holes. Under the drag of the chain, the extracted materials slide forward along the screen, and the leaching solvent is sprayed backward, forming a continuous countercurrent extraction mode. Their common feature is that during the extraction process, the solvent is sprayed from the top of the extraction material b...

AI Technical Summary

Problems solved by technology

The common disadvantage of these known continuous extraction methods is that the fine powder formed due to the small particle size of the extracted material is easy to block the sieve, the permeability on the sieve surface is limited, and the concentration and contact surface of the upper and lower layers in contact with the solvent There is a big difference, that is, the extraction effect is good when the concentration of solvent in the upper layer of the cross-section of the material is low, while the lower layer has poor permeability, and the extraction rate is low if the solvent concentration is high. A concentration gradient is formed between the upper and lower layers of the material, and the extraction of the lower layer is insufficient completely, thus, seriously affecting the overall extraction

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