Purification method for plant indigo

A purification method, the technology of indigo, which is applied in the field of plant indigo purification, can solve the problems of complex dyeing process, poor solubility, difficulty in large-scale production, etc., and achieve the effect of low purification cost, simple operation and reduced dosage

Inactive Publication Date: 2010-09-08
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of these impurities limits the use effect of plant indigo, and also leads to low dye strength of plant indigo, complicated dyeing process, low dyeing efficiency, and difficulty in large-scale production
[0004] Plant indigo has poor solubility in common organic solvents, and most organic solvents also have problems such as high toxicity and serious environmental pollution, which makes the purification of plant indigo difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Put 1000g of plant indigo dry powder (5% strength) into 2000g N, N dimethylformamide solvent, stir at 20°C for 1 hour, and filter;

[0012] Add 2000g N, N dimethylformamide to the filter residue, stir at 30°C for 1 hour, filter, and repeat this operation once;

[0013] The filtrates obtained by the three times of filtration were combined, and the solvent was recovered by rotary evaporation at 150° C. to obtain a concentrated solution. After vacuum drying, the obtained indigo powder was washed with ethanol and water, and dried to obtain 49.8 g of indigo finished product.

[0014] After testing, the strength of this indigo finished product is 85%.

Embodiment 2

[0016] Put 3000g of water-containing indigo paste (0.5%) into 3000g of cyclohexane, stir at 50°C for 2 hours, and filter;

[0017] Add the filter residue to 3000g cyclohexane, stir at 50°C for 2 hours, filter, and repeat this operation once;

[0018] The filtrates obtained by the three times of filtration were combined, and the solvent was recovered by rotary evaporation to obtain a concentrated solution. After vacuum drying, the obtained indigo powder was washed with ethanol and water, and dried to obtain 14.5 g of indigo finished product.

[0019] After testing, the strength of this indigo finished product is 90%.

Embodiment 3

[0021] Put 1000g of plant indigo dry powder (5% strength) into 4000g N, N dimethylformamide solvent, stir at 100°C for 20min, and filter;

[0022] Add 2000g N, N dimethylformamide to the filter residue, stir at 100°C for 20min, filter, and repeat this operation once;

[0023] Combine the filtrates obtained from the three times of filtration, rotate and evaporate at 150°C and recover the solvent to obtain a concentrated solution, after vacuum drying, wash the obtained indigo powder with ethanol and water, and dry to obtain the finished indigo product.

[0024] After testing, the strength of this indigo finished product is 87%.

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PUM

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Abstract

The invention discloses a purification method for plant indigo. The method is that crude plant indigo is put in organic solvent, the organic solvent is heated to 20-100 DEG C, agitation is conducted to dissolve the indigo, solution and insoluble impurities are separated, the solution is dried to obtain powder, the obtain powder is cleaned and dried to obtain indigo finished product, and the used organic solvent comprises N, N dimethylformamide and cyclohexane. The invention has the advantages that the operation of the method is simple, the strength of the plant indigo can be obviously improved, the used amount of the indigo during dyeing is effectively reduced and the dyeing efficiency of the indigo is improved; the toxicity of the used solvent is low and the environment is protected; and the solvent is recyclable and the purification cost is low.

Description

technical field [0001] The invention relates to a method for purifying plant indigo. Background technique [0002] Plant indigo is extracted from plants and is a natural product with better safety than chemically synthesized ones. Therefore, the application of plant indigo has not disappeared with the emergence of chemically synthesized indigo. [0003] Plant indigo is generally obtained by traditional fermentation, lime treatment, and precipitation separation. The plant indigo produced by the traditional method is mixed with a large number of impurities, including calcium carbonate, grass dregs and the like. The existence of these impurities limits the use effect of plant indigo, and also causes the dye strength of plant indigo to be low, the dyeing process is complicated, the dyeing efficiency is low, and it is difficult to produce on a large scale. [0004] Plant indigo has poor solubility in common organic solvents, and most organic solvents also have problems such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00C09B67/10
Inventor 刘祥霞狄剑锋贾永堂杜文琴关劲良
Owner WUYI UNIV
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