Subcritical extraction method using liquid ammonia as solvent

A subcritical, extraction technology, applied in solvent extraction, separation methods, chemical instruments and methods, etc., can solve problems such as unreported

Inactive Publication Date: 2010-12-15

HENAN YALINJIE BIOLOGICAL TECH

4 Cites 34 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the reported subcritical extraction solvents are all non-polar or weakly polar, and are mainly used to extract fat-soluble components in substances, such as extracting o...

Abstract

The invention relates to an extraction process of a subcritical solvent, in particular to a process method for extracting water soluble ingredients in some substances by using the liquid ammonia as a subcritical extraction solvent at a certain temperature and under a certain pressure. The extraction process comprises the following steps of: placing a water soluble ingredient-containing material to be extracted in a closed extraction container; and injecting the liquid ammonia into the closed extraction container for extraction. The method of the invention can be used for extracting various water soluble ingredients such as plant polysaccharide, plant polyphenol, alkaloid, plant total glycosides and pigments, the whole extraction and solvent removal process can be carried out at normal temperature or at a low temperature, and the extracted material is not required to be heated, so that the thermo-sensitive ingredients can be separated on the premise of keeping quality. The method also can be used for extracting biological medical ingredients of traditional Chinese medicinal materials or the juice of fresh plants.

Application Domain

Solvent extraction

Technology Topic

SolventAmount of substance +11

Examples

Experimental program(7)

Example Embodiment

[0015] Example 1: Extraction of plant polyphenols: Take 4000 kg of tea leaves and send them to an extractor with a pressure vessel structure. After closing the feed channel, the pressure in the device is reduced to -0.08Mpa after air is drawn, and liquid ammonia extraction solvent is injected Perform three counter-current extractions, the extraction time is 30-120 minutes, the extraction temperature is 20°C-40°C, and the extraction pressure is 0.8 Mpa-1.5Mpa; the extracted liquid enters the evaporation system to vaporize the solvent and separate the extract, that is A plant polyphenol product with tea polyphenols as the main component is obtained; after the extraction is completed, the liquid solvent in the extractor is exhausted, and the outlet valve of the extractor is opened to vaporize the liquid ammonia solvent adsorbed in the material and separate the material, and then exit the extractor . In the process of material desolvation, heat should be added to the material to maintain the rapid evaporation of liquid ammonia solvent. After the desolventization is completed, the extracted tea residue can be discharged from the extractor, and the extractor can enter the next production cycle. The solvent gas evaporated from the material and the extract is compressed and liquefied by the ammonia compressor, and the liquid solvent flows back to the solvent circulation tank for recycling.

[0016] This embodiment is also suitable for the extraction of products rich in plant polyphenols such as grape seeds and blueberries.

Example Embodiment

[0017] Example 2: Extraction of plant pigments: Take 4000 kg of gardenia fruits and send them to an extractor with a pressure vessel structure. After closing the feed channel, the pressure in the device is reduced to -0.08Mpa after air is drawn. Inject liquid ammonia extraction solvent for four counter-current extractions, the extraction time is 60-150 minutes, the extraction temperature is 20°C-40°C, and the extraction pressure is 0.8 Mpa-1.5Mpa. The extract obtained from the extraction enters the evaporation system to vaporize the solvent and separate the extract to obtain a plant extract product with the water-soluble pigment gardenia yellow as the main component. After the extraction is completed, the solvent in the material is removed according to the conditions in Example 1, the gardenia residue is taken out from the extractor, and the solvent is recovered for recycling.

Example Embodiment

[0018] Example 3: Extraction of plant alkaloids: Take 4000 kg of tobacco leaves and send them to an extractor with a pressure vessel structure. After closing the feed channel, the pressure in the device is reduced to -0.08Mpa after air is drawn. Inject liquid ammonia extraction solvent for two countercurrent extractions. The extraction time is 30 to 120 minutes, the extraction temperature is 20°C to 40°C, and the extraction pressure is 0.8 Mpa to 1.5Mpa. The extract obtained from the extraction enters the evaporation system to vaporize the solvent and separate the extract to obtain a plant alkaloid product with nicotine as the main component. After the extraction is completed, the solvent in the material is removed according to the conditions in Example 1, the tobacco leaves are taken out from the extractor, and the solvent is recovered for recycling.

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.