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Method for extracting laccaic acid

An extraction method and a technology of shellac acid, applied in the field of pigments, can solve problems such as environmental pollution, shorten the extraction process of shellac acid, etc., and achieve the effect of obvious refining effect.

Active Publication Date: 2013-04-03
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

[0019] The object of the present invention is to provide a kind of extracting method of lac acid in view of the problems existing in the prior art. National Standard - Food Additive Lac Red Pigment [GB4571-1996]" shortens the extraction process of lac acid, improves the yield and purity of lac acid, reduces production energy consumption, and comprehensively utilizes resources. Fundamentally solved the environmental pollution problem of shellac industrial production

Method used

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  • Method for extracting laccaic acid
  • Method for extracting laccaic acid
  • Method for extracting laccaic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0072] 1. Preparation of Lac-Na 2 CO 3 the solution

[0073] 1A. Pulverizing the latin gum into granules with a particle size of 4-6 mm, removing impurities such as branches and sand through a circular pendulum sieve, and obtaining the pulverized lacella gum granules;

[0074] 1B, adding 100g of shellac gum pulverized particles to a volume of 500mL Na 2 CO 3 In the solution, heat and keep the temperature at 60°C, stir and dissolve, then filter to further remove impurities such as branches and sand, and purify the shellac; then put the filtered filtrate at 10°C for 24 hours, and cool the shellac resin solution , to make shellac wax crystallization; then filter to remove shellac wax, fatty substances and other insolubles, collect the filtrate, and obtain shellac-Na 2 CO 3 solution (500mL), wherein, Na 2 CO 3 The molar concentration of the solution is 0.19mol / L, the weight of the shellac gum and Na 2 CO 3 The volume ratio of the solution is 1:5, that is, every 1g of shel...

Embodiment 2

[0149] 1. Preparation of Lac-Na 2 CO 3 the solution

[0150] 1A. Pulverizing the latin gum into granules with a particle size of 1 to 4 mm, removing impurities such as branches and sand through a vibrating sieve to obtain pulverized lacella gum granules;

[0151] 1B, adding 100g of shellac gum pulverized particles to a volume of 1400mL Na 2 CO 3 In the solution, heat and keep the temperature at 40°C, stir and dissolve, then filter to further remove impurities such as branches and sand, and purify shellac; then put the filtered filtrate at 5°C for 24 hours, and cool the shellac resin solution , to make shellac wax crystallization; then filter to remove shellac wax, fatty substances and other insolubles, collect the filtrate, and obtain shellac-Na 2 CO 3 solution (1400mL), wherein, Na 2 CO 3 The molar concentration of the solution is 0.10mol / L, the weight of the shellac gum and Na 2 CO3 The volume ratio of the solution is 1:14, that is, every 1g of lac is dissolved in 14...

Embodiment 3

[0167] 1. Preparation of Lac-Na 2 CO 3 the solution

[0168] 1A. Pulverizing the latin gum into granules with a particle size of 7-10 mm, and removing impurities such as branches and sand through a circular pendulum sieve to obtain pulverized lacella gum granules;

[0169] 1B. Add 100g of shellac gum pulverized particles into 300mL of Na 2 CO 3 In the solution, heat and keep the temperature at 90°C, stir and dissolve, then filter to further remove impurities such as branches and sand, and purify the shellac; then put the filtered filtrate at 2°C for 24 hours, and cool the shellac resin solution , to make shellac wax crystallization; then filter to remove shellac wax, fatty substances and other insolubles, collect the filtrate, and obtain shellac-Na 2 CO 3 solution (300mL), wherein, Na 2 CO 3 The molar concentration of the solution is 0.25mol / L, the weight of the shellac gum and Na 2 CO 3 The volume ratio of the solution is 1:3, that is, every 1g shellac is dissolved i...

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Abstract

The invention discloses a method for extracting laccaic acid. The method comprises the steps of carrying out salt-out treatment, sedimentation treatment and acid treatment on sticklac aqueous alkali sequentially. The method disclosed by the invention is simple in process and convenient to operate; appearance, color, and physical and chemical indicators of the lac red pigment can reach the standard stated by 'the state standard of the People's Republic of China-food additive lac red pigment [GB4571-1996]'; the yield of the laccaic acid and the purity of the lac red pigment are improved; the production period is reduced; the resources are comprehensively utilized, and the problem of environmental pollution in industrial production of lac is fundamentally solved.

Description

technical field [0001] The invention relates to a method for preparing natural-sourced pigment from natural raw materials, in particular to a method for preparing lac color acid. Background technique [0002] Lac acid (lacaic acid) is a polyhydroxy anthraquinone compound secreted by lac insects. Its trade name is lac dye, and it mainly includes A, B, C, E and D, etc. Five structures, the structures of which are shown in formula (1) and formula (2), [0003] [0004] Lacaic acid A, B, C and E: R-C 22 h 11 o 11 ,in: [0005] A:R=CH 2 CH 2 NHCOCH 3 [0006] B:R=CH 2 CH 2 Oh [0007] C:R=CH 2 CHNH 2 COOH [0008] E:R=CH 2 CH 2 NH 2 [0009] (1) [0010] [0011] Lacaic acid D:C 16 h 10 o 7 [0012] (2) [0013] Lac acid itself is red or pink powder, and when dissolved in water, the hue varies from pink to purple. Lac color acid is widely used in printing and dyeing, food, medicine, cosmetics and other industries due to its excellent coloring abi...

Claims

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Application Information

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IPC IPC(8): C09B1/06
Inventor 张弘房桂干李坤陈晓鸣郑华冯颖张敏
Owner THE RES INST OF RESOURCES INSECTS RIRI OF THE CHINESE ACADEMY OF FORESTRY
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