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Process method for preparing high-purity tannin from walnut green husk

A technology of walnut green peel and process method, which is applied in the field of medicine and chemical industry, can solve the problems of low extraction efficiency, high extraction temperature, easy destruction of effective components, etc., and achieves the effects of improving extraction rate, low extraction temperature and avoiding adverse effects.

Active Publication Date: 2014-04-16
许秀香
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problems such as low extraction efficiency, high extraction temperature, and easy destruction of active ingredients in the traditional extraction and separation method of plant tannic acid, so as to provide a tannin-derived tannin with the advantages of high extraction efficiency, low extraction temperature, stability and reliability, etc. Process for preparing high-purity tannic acid from walnut green husk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Get 100 kilograms of green walnut peel (27.65% tannic acid content), crush it into 10 meshes, add 1000 kilograms of water, and enter into the tubular ultrasonic countercurrent extraction equipment together, the ultrasonic frequency is 25 Hz, and the extraction time is 80 minutes. The residue after extraction is discharged from the slag outlet, and the extract is poured into the storage tank from the discharge pipe, and is coarsely filtered with a 100-mesh stainless steel mesh to obtain a filtrate with an extraction rate of 94.5%. The filtrate is using a plate and frame filter (2m 3 ) filtration, the filtrate is introduced into the ultrafiltration system, the selected ultrafiltration membrane has a molecular weight cut-off of 50,000, and the pressure difference between the inlet and the outlet is adjusted to 0.3MPa. The first ultrafiltration permeate is poured into the second ultrafiltration membrane for separation. The molecular weight cut off was 3000, and separation a...

Embodiment 2

[0030] Get 100 kilograms of green walnut skin (27.65% tannic acid content), crush it into 20 meshes, add 1000 kilograms of water, and enter into the tubular ultrasonic countercurrent extraction equipment together, the ultrasonic frequency is 30 Hz, and the extraction time is 80 minutes. The residue after extraction is discharged from the slag outlet, and the extract is poured into the storage tank from the discharge pipe, and is coarsely filtered with 80 mesh stainless steel mesh to obtain the filtrate, with an extraction rate of 94.7%. The filtrate is using a plate and frame filter (2m 3 ) filtration, the filtrate is introduced into the ultrafiltration system, the selected ultrafiltration membrane has a molecular weight cut-off of 50,000, and the pressure difference between the inlet and the outlet is adjusted to 0.3MPa. The first ultrafiltration permeate is poured into the second ultrafiltration membrane for separation. The molecular weight cut off was 3000, and separation a...

Embodiment 3

[0032] Get 100 kilograms of green walnut skin (27.65% tannic acid content), crush it into 10 meshes, add 1000 kilograms of water, and enter into the tubular ultrasonic countercurrent extraction equipment together, the ultrasonic frequency is 25 Hz, and the extraction time is 60 minutes. The residue after extraction is discharged from the slag outlet, and the extract is poured into the storage tank from the discharge pipe, and is coarsely filtered with a 100-mesh stainless steel mesh to obtain a filtrate with an extraction rate of 94.5%. The filtrate is using a plate and frame filter (2m 3 ) filtration, the filtrate is introduced into the ultrafiltration system, the selected ultrafiltration membrane has a molecular weight cut-off of 50,000, and the pressure difference between the inlet and the outlet is adjusted to 0.3MPa. The first ultrafiltration permeate is poured into the second ultrafiltration membrane for separation. The molecular weight cut off was 3000, and separation a...

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Abstract

The invention provides a process method for preparing high-purity tannin from walnut green husk and relates to the technical field of pharmaceutical chemical engineering, and the method is designed for solving the technical problems that the extraction efficiency is low, the extraction temperature is high, effective components are easy to destroy and the like in the traditional separation and extraction method of plant tannin. The process method for preparing high-purity tannin from the walnut green husk comprises the following process flows: smashing the walnut green husk and then breaking walls with ultrasonic wave for extraction; carrying out solid-liquid separation, and then carrying out grading separation and purification by virtue of a molecular ultrafiltration membrane; and concentrating through a nanofiltration membrane, carrying out extrinsic cycle concentration at reduced pressure, and drying through microwave, so as to respectively obtain products of two specifications and applications, namely, industry-grade tannin (85%) and medicine-grade tannin (95%).

Description

technical field [0001] The invention relates to the technical field of medicine and chemical industry, in particular to a process for preparing high-purity tannic acid from green walnut peel. Background technique [0002] There are various methods for extracting and separating plant tannins. The classic extraction methods include warm water decoction, supercritical CO 2 Extraction method, organic solvent extraction method, etc. [0003] The extraction efficiency of the water extraction method is generally not high, and overheating will destroy the active ingredients, and it is also difficult to filter the ingredients rich in polysaccharides. [0004] The supercritical fluid extraction and separation process is carried out by using the relationship between the dissolving capacity and density of the supercritical fluid, that is, using the influence of pressure and temperature on the dissolving capacity of the supercritical fluid. When the gas is in a supercritical state, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H13/08C07H1/08
Inventor 许秀香
Owner 许秀香