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Subcritical extraction method using liquid ammonia as solvent

A subcritical and extraction technology, applied in solvent extraction, separation methods, chemical instruments and methods, etc., can solve problems that have not been reported

Inactive Publication Date: 2012-07-11
HENAN YALINJIE BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 oil in soybeans, lutein in marigold flowers, and lutein in roses. Essential oils, etc., have not yet been reported on subcritical extraction solvents for water-soluble components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Extraction of plant polyphenols: Take 4000 kg of tea leaves and put them into an extractor with a pressure vessel structure. After closing the feeding channel, pump out the air and reduce the pressure inside the device to -0.08Mpa, inject liquid ammonia extraction solvent Three countercurrent extractions are carried out, 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 extract enters the evaporation system to vaporize the solvent and separate the extract, that is To obtain plant polyphenol products with tea polyphenols as the main component; 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 from the material, and then discharge the extractor . During the desolvation process of the material, heat should be added ...

Embodiment 2

[0017] Example 2: Extraction of plant pigments: Take 4000 kg of gardenia fruit and send it into an extractor with a pressure vessel structure. After closing the feeding channel, pump out the air to reduce the internal pressure to -0.08Mpa. Pour in liquid ammonia extraction solvent for four countercurrent 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 extracted liquid enters the evaporation system to vaporize the solvent and separate the extract to obtain the plant extract product with the water-soluble pigment gardenia yellow as the main component. After the extraction was completed, the solvent in the material was removed according to the conditions in Example 1, the gardenia residue was taken out from the extractor, and the solvent was recovered for recycling.

Embodiment 3

[0018] Example 3: Extraction of plant alkaloids: Take 4000 kg of tobacco leaves and send them into an extractor with a pressure vessel structure. After closing the feeding channel, the air is pumped out to reduce the pressure inside the device to -0.08Mpa. Pour in liquid ammonia extraction solvent for two countercurrent 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 extract 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.

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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.

Description

technical field [0001] The invention relates to an extraction process of a subcritical solvent, specifically a process for extracting water-soluble components contained in some substances by using liquid ammonia as a subcritical extraction solvent at a certain temperature and pressure. Background technique [0002] At present, there are many kinds of subcritical extraction solvents that have been used or are undergoing experimental research, such as butane, propane, isobutane, tetrafluoroethane (R134a), dimethyl ether, sulfur hexafluoride, dichlorodi Fluoromethane (Freon R12), chlorodifluoromethane (Freon R22) and other substances that are gases at normal temperature and pressure, and are easily liquefied when pressurized or cooled. There have been a number of patented inventions in this area. The earliest Chinese patent "Liquefied Petroleum Gas Leaching Oil Technology" (Patent No.: 90108660.6) was authorized in 1992. Dozens of complete sets of production equipment designed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/00
Inventor 祁鲲
Owner HENAN YALINJIE BIOLOGICAL TECH
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