Method for extracting natural dye from pomegranate peel and leaft

A technology of pomegranate peel and natural dyes, applied in the field of natural dyes, can solve the problems of complex tannin pigment composition and cannot be directly used as dyes, etc., and achieve the effect of fast dyeing effect

Inactive Publication Date: 2007-02-14
青岛海联植物科技研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the current extraction of tannin pigment components is complex and cannot be directly used as dyes and replace harmful chemical components in plant dyes, a method for extracting natural reactive dyes from pomegranate peel and pomegranate leaves is invented.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 5 kilograms of pomegranate peel (dry) and 2 kilograms of pomegranate leaves (dry) and put them in a large bottle for extraction (do not use metal containers). Add 35L of 80% ethanol aqueous solution to the pomegranate peel, and add 20L of 70% of the pomegranate leaves. The ethanol aqueous solution was heated for two hours and allowed to stand overnight. Generally 3-4 times of extraction are required until the color becomes lighter. The above extract is filtered and concentrated under reduced pressure. During the concentration of pomegranate leaves, precipitation occurs. Take the precipitate and vacuum dry to obtain a coffee-colored powder; add the concentrate of the pomegranate peel to pure alcohol to obtain a yellow precipitate, which is separated and dried to obtain soil Yellow powder, the mother liquor is concentrated under reduced pressure. Pour the concentrate of the pomegranate peel into a column equipped with a treated macroporous resin adsorption resin for colu...

Embodiment 2

[0032] Take 5 kg of pomegranate peel (dry) and 2 kg of pomegranate leaves (dry) and put them in a large bottle for extraction (do not use a metal container). Add 35L of 50% ethanol aqueous solution to the pomegranate peel, and add 20L of 50% water to the pomegranate leaves. The ethanol aqueous solution was heated for two hours and allowed to stand overnight. Generally 3-4 times of extraction are required until the color becomes lighter. The above extract is filtered and concentrated under reduced pressure. During the concentration of pomegranate leaves, precipitation occurs. Take the precipitate and vacuum dry to obtain a coffee-colored powder; add the concentrate of the pomegranate peel to pure alcohol to obtain a yellow precipitate, which is separated and dried to obtain soil Yellow powder, the mother liquor is concentrated under reduced pressure. Pour the concentrate of the pomegranate peel into a column equipped with a treated macroporous resin adsorption resin for column adso...

Embodiment 3

[0039] Take 5 kg of pomegranate peel (dry) and 2 kg of pomegranate leaves (dry) and put them in a large bottle for extraction (do not use a metal container). Add 35L of 30% ethanol aqueous solution to the pomegranate peel, and add 20L of 30% water to the pomegranate leaves. The ethanol aqueous solution was heated for two hours and allowed to stand overnight. Generally 3-4 times of extraction are required until the color becomes lighter. After filtering the above extract and concentrating under reduced pressure, precipitation occurs during the concentration of pomegranate leaves. Take the precipitate and vacuum dry to obtain a coffee-colored powder; add the concentrate of pomegranate peel to pure alcohol to obtain yellow precipitate, which is separated and dried Yellow powder, the mother liquor is concentrated under reduced pressure. Pour the concentrate of the pomegranate peel into a column equipped with a treated macroporous resin adsorption resin for column adsorption, so that t...

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PUM

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Abstract

The method of extracting natural dye from pomegranate pericarp and leaf is to extract natural active dye from pomegranate pericarp and leaf containing condensated tannin in 21-29 % possessing dyeing activity in the molecular weight range of 350-2000. By means of improved extracting process, gold yellow dye, earthy yellow dye, chocolate brown dye, coffee dye, yellow dye, black dye and plant mordant of purity over 90 % are prepared. The obtained dyes may be used as permanent pure botanic dyes. The obtained dyes are used in dyeing hair, wool, fabric, etc.

Description

Technical field [0001] The invention relates to the field of natural dyes, in particular to a technology for the extraction and dyeing performance of natural plant dyes. Background technique [0002] Tannins in the vegetable dye products currently used on the market account for the main raw material components. This dye component uses direct water or organic solvent extraction methods to obtain the total tannin components. The components are complex and the molecular weight range is too large. Or too small, poor dyeing effect and weak dyeing. In order to overcome these shortcomings, the vegetable tannin dye products used are added with phenylenediamine and toxic heavy metal carcinogenic compounds. These substances are very harmful to the human body. Summary of the invention [0003] In order to solve the problem that the extraction of tannin pigment components is complicated and cannot be directly used as dyes and replace harmful chemical components in plant dyes, the present in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
Inventor 阿依别克.马力克
Owner 青岛海联植物科技研究所
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