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Method for refining lac red coloring matter

A technology of shellac red pigment and refining method, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve problems such as shortening process, environmental pollution, etc., and achieve obvious refining effect, improve safety, and eliminate pollution. Effect

Inactive Publication Date: 2008-07-09
THE RES INST OF RESOURCES INSECTS RIRI OF THE CHINESE ACADEMY OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a refining method for lac red pigment in view of the problems existing in the prior art. -Food additive lac red pigment [GB / T 4571-1996], which shortens the refining process of lac red pigment, improves the yield and purity of lac red pigment, reduces production energy consumption, and comprehensively utilizes resources , fundamentally solve the environmental pollution problem of shellac industrial production

Method used

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  • Method for refining lac red coloring matter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. The raw rubber is crushed into particles with a particle size of 4-6 mm, and impurities such as resin, sand and soil are removed through a circular pendulum sieve;

[0045] 2. Add the crushed raw gum particles into a gum washing tank containing industrial tap water with a pH value between 7 and 8, and control the gum-to-liquid ratio (that is, the weight ratio of the crushed raw gum to the weight of the aqueous solution) at 1:5, Soak for 4 hours to collect the gel washing liquid; repeat three times and combine the gel washing liquid;

[0046] 3. Put the gel washing liquid into the clarification tank to settle, separate the sand and the fine shellac, the settlement time is 12 hours;

[0047] 4. The clarified washing liquid is filtered in two stages, the filter screen of the first filter is 200 mesh stainless steel wire mesh, and the filter of the second filter is 400 mesh stainless steel wire mesh;

[0048] 5. Use citric acid (solid) to adjust the acid value of the filtrate...

Embodiment 2

[0055] 1. Crush the raw rubber into particles with a particle size of 1 to 4 mm, and remove impurities such as resin and sand through a vibrating screen;

[0056] 2. Put the crushed raw rubber particles into a washing tank containing industrial tap water with a pH value of between 7 and 8, control the ratio of glue to liquid to 1:8, soak for 12 hours to collect the washing liquid; repeat three times and combine the washing liquid;

[0057] 3. Put the gel washing liquid into the clarification tank to settle, and separate the sand and fine shellac. The clarification time is 24 hours;

[0058] 4. Two-stage filtration of the clarified washing liquid, the first-stage filter is a 200-mesh stainless steel wire mesh, and the second-stage filter is a 400-mesh stainless steel wire mesh;

[0059] 5. Use phytic acid solution with a weight concentration of 3% to adjust the acid value of the filtrate, and control the pH of the filtrate to be 3.5-4.0;

[0060] 6. Feed the phytic acid-adjusted fi...

Embodiment 3

[0064] 1. Crush the raw rubber into particles with a particle size of 7-10 mm, and remove resin, sand and other impurities through a circular pendulum screen;

[0065] 2. Put the crushed raw rubber particles into a washing tank containing industrial tap water with a pH value of 7 to 8, control the ratio of glue to liquid to 1:3, soak for 2 hours to collect the washing liquid; repeat three times and combine the washing liquid;

[0066] 3. Put the gel washing liquid into the clarification tank to settle, separate the sand and the fine shellac, and the clarification time is 2 hours;

[0067] 4. The clarified washing liquid is filtered in two stages, the filter screen of the first filter is 200 mesh stainless steel wire mesh, and the filter of the second filter is 400 mesh stainless steel wire mesh;

[0068] 5. Adjust the acid value of the filtrate with an acetic acid solution with a weight concentration of 5%, and control the pH of the filtrate to 3.5-4.0;

[0069] 6. The filtrate ad...

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Abstract

The invention relates to a process for extracting from virgin rubber purple twig and refining lac dye, which comprises immersing the virgin rubber with water, extracting rubber washing liquid, and filtering the rubber washing liquid through microfiltration and hyperfiltration. The process of the invention has simple technique and convenient operation, the appearance color and physicochemical index of the refined lac dye achieve the standard which is regulated by 'national standards of P.R.C- food additives namely lac dye(GB / T4571-1996)', wherein the contents of heavy metal such as plumbum, arsenic and the like greatly lower than the contents which are regulated by the national standard. The invention improves the security for eating of the lac dye, shortens the refining technique of the lac dye, improves the yield rate and pureness of the lac dye, lowers energy consumption of producton, utilizes a film refining method to refine the lac dye, avoids adding a large amount of acid and alkalic, and keeps the original chemical structure of the lac dye, and then the environmental pollution problem of the industrial production of lac is solved fundamentally.

Description

Technical field [0001] The invention relates to a method for preparing natural source pigments from natural raw materials, in particular to a method for preparing lac red pigment. Background technique [0002] Lac red pigment is one of the most widely used natural pigments. It is an extract derived from animals. The use of lac red pigment is earlier than the use of lac resin. Lac red pigment is traditionally used in food, medicine, cosmetics, printing and dyeing and textile industries. Its color itself is red or peach, but it is mixed through mordant dyeing. Other shades are available. [0003] In recent years, with the development of medical toxicology and biological experiments, people have realized that some synthetic food colorings are toxic to the human body, and some have carcinogenic effects. Therefore, natural colorings have regained general attention and application. . Lac red pigment is water-soluble and non-toxic, and has been widely used as a safer additive. Moreover,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00B01D61/14
Inventor 张弘郑华陈军陈智勇陈晓鸣石雷唐莉瑛
Owner THE RES INST OF RESOURCES INSECTS RIRI OF THE CHINESE ACADEMY OF FORESTRY
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