Low-cost, efficient and continuous tea saponin extraction process

Abstract

The invention discloses a low-cost, efficient and continuous tea saponin extraction process. The low-cost, efficient and continuous tea saponin extraction process comprises steps as follows: (1) pretreated oil-tea meal is dried; (2) the tea meal with water content adjusted enters an extractor for continuous extraction; (3) extracted wet meal enters a DTDC (desoloventizer, toaster, dryer and cooler) type dryer with multiple material layers and is dried, after the moisture content of dried meal is adjusted, the meal is metered and packaged, and feed grade tea meal is obtained; (4) a tea saponin mixed solution discharged out of the extractor enters a cyclone device for separation; (5) a separated tea saponin concentrated solution is fed into a drying section for drying, and a tea saponin crude product is obtained. With the adoption of the process, the extraction efficiency of tea saponin is effectively improved, and the processing cost is effectively reduced; the tea saponin can be taken as a raw material for feed; the purity of the extracted saponin crude product is improved; large-scale extraction of the tea saponin is easier to realize, the processing benefits of by-products are effectively improved, and the technical bottleneck problem in the aspect of development of byproducts of tea oil is solved.

Description

technical field [0001] The invention relates to the technical field of tea saponin extraction, in particular to a low-cost and high-efficiency continuous extraction process of tea saponin. Background technique [0002] The existing extraction process of tea saponin has two methods: tank batch batch extraction and rotary extractor continuous extraction, among which there are few factories using horizontal rotary extractor for continuous extraction. The tank group extraction method adopts more than 2 extraction tanks and performs single tank operation. After extracting tea saponin, the tea dregs from which tea saponin is extracted in the tank are dried and the solvent is recovered; Unit operation, so the production capacity and efficiency are very low. Due to the poor airtightness of the process, the tea meal for extracting tea saponin contains a large amount of solvent that cannot be recovered, resulting in high solvent consumption and high production costs. The method of co...

AI Technical Summary

Problems solved by technology

The tank group extraction method adopts more than 2 extraction tanks and performs single tank operation. After extracting tea saponin, the tea dregs from which tea saponin is extracted in the tank are dried and the solvent is recovered; Unit operation, so the production capacity and efficiency are very low. Due to the poor airtightness of the process, the tea meal for extracting tea saponin contains a large amount of solvent that cannot be recovered, resulting in high solvent consumption and high production costs.

The method of continuous extraction with a horizontal rotary extractor adopts the method of drying the tea dregs and then entering the horizontal rotary extractor for continuous extraction, and the tea dregs extracted from tea saponin enter the dryer and are dried at a low material level. The tea saponin solution is heated, evaporated and concentrated, and then dried to obtain the crude product of tea saponin; since the tea meal used as the extraction material has not been pretreated, the problem of large powder degree in the extraction process cannot be solved, so the solvent permeability is poor during the extraction process. The material level of the extractor is low, which reduces the extraction effect and extraction efficiency; the wet meal after extraction is not treated with steam during drying, and the drying process is unreasonable, resulting in high solvent residue in the meal and high solvent consumption. One of the main reasons; in the drying process of tea saponin, because the dried gas containing solvent cannot be recovered, the solvent consumption is too large; due to the low extraction efficiency, large-scale application is relatively difficult

Images