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Method for recovering lac and extracting lac wax

A kind of shellac wax and shellac technology, applied in the field of shellac wax, can solve problems such as wasting shellac resources, environmental pollution, etc., and achieve the effects of solving secondary pollution and improving economic benefits

Inactive Publication Date: 2009-03-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the rainy season comes, the lac wax and lac pigment in the waste flow into the soil and farmland with the rain, which not only pollutes the environment, but also wastes the precious lac resources in the slag

Method used

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  • Method for recovering lac and extracting lac wax
  • Method for recovering lac and extracting lac wax
  • Method for recovering lac and extracting lac wax

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]Example 1: 18000mL of sodium carbonate solution with a concentration of 0.2% (wt%) was heated to a temperature of 85°C, and 2000g (moisture content 41.5wt%) of purple shellac slag was added for dissolution. After the addition, the mixture was stirred at a constant temperature and reacted for 30min. After the stirring is stopped, at a temperature of 85°C, filter with a stainless steel screen with a pore size of 0.074mm, separate branches, insect corpses and insoluble shellac shells, and obtain a sodium carbonate solution containing shellac and shellac wax that removes mechanical impurities; filter After the solution obtained is placed in a cold water bath and cooled to a temperature of 35°C, add 150 mL of sodium hypochlorite solution with an available chlorine content wt% of 4% under stirring and bleach until the color index is lower than 1.0, then stop, and the bleaching time is 10 hours; after standing still and naturally cooling , take out the floating matter solidified...

Embodiment 2

[0023] Example 2: 12000mL of sodium carbonate solution with a concentration of 0.5% (wt%) was heated to a temperature of 90°C, and 2000g (moisture content 41.5wt%) of purple shellac slag was added for dissolution. After the addition, the mixture was stirred at a constant temperature and reacted for 60min. After stopping the stirring, at a temperature of 90°C, filter through a stainless steel screen with a pore size of 0.074 mm, separate branches, insect corpses and insoluble shellac shells, and obtain a sodium carbonate solution containing shellac and shellac wax that removes mechanical impurities; filter After the solution obtained is placed in a cold water bath and cooled to a temperature of 40°C, under stirring, 140 mL of sodium hypochlorite solution with an available chlorine content of 3% by weight is added to bleach until the color index is lower than 1.0 and then stop. The bleaching time is 21 hours; after standing still and naturally cooling , take out the floating matt...

Embodiment 3

[0026] Example 3: Warm up 18000mL of water to 90°C, add 2000g of purple-red shellac slag (moisture 41.5wt%) to dissolve, and react for 180min under constant temperature stirring after the addition. After stopping the stirring, at a temperature of 90°C, filter through a stainless steel screen with a pore size of 0.074 mm, separate branches, insect corpses and insoluble shellac shells, and obtain a sodium carbonate solution containing shellac and shellac wax that removes mechanical impurities; filter After the solution obtained is placed in a cold water bath and cooled to a temperature of 28°C, under stirring, add 1480mL of sodium hypochlorite solution with an available chlorine content of 4% by weight to bleach until the color index is lower than 1.0 and then stop. The bleaching time is 18h; after standing still and naturally cooling , take out the floating thing solidified on the surface to obtain shellac wax crude product, shellac wax crude product weight 325.9g; Remaining sol...

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Abstract

The invention relates to a method for recovering a lac and extracting a lac-wax, which comprises: water or a dilute sodium carbonate solution is utilized for dissolving red dregs containing the lac and the lac-wax which are generated during the production process of a bleached lac, the dissolving temperature is between 70 DEG C and 100 DEG C and heat filtration is carried out so as to obtain a sodium carbonate solution containing the lac and the lac-wax removed from lots of mechanical substances; the solution is cooled and a dilute sodium hypochlorite solution is added for bleaching; the bleached solution stands to separate into layers and a lac-wax crude product is obtained by taking out the surface coagulum; the solution is filtered with diatomite or active floridin, the filtrate is added with dilute sulphuric acid so as to separate out a white floc and a bleached lac-wax is obtained after washing, solid-liquid separation and drying; the lac-wax crude product is covered with a piece of filter paper or filter cloth and put into a soxhlet extractor, an organic solvent is added to carry out refluxing extraction so as to obtain a mixture of organic substances and the lac-wax; the mixture of the organic substances and the lac-wax is carried out with normal pressure or reduced pressure volatilization and distillation and after the organic solvent is recovered, the rest is cooled and a refined lac-wax product is obtained.

Description

1. Technical field [0001] The invention relates to a method for recovering shellac from purple-red waste residue produced in the shellac bleaching process, preparing bleached shellac and extracting shellac wax in the residue. Specifically, the present invention relates to a method for recovering lac from lac waste residue to prepare bleached lac that can meet the requirements of the food and pharmaceutical industries and to extract shellac wax that can meet the requirements of the food, cosmetic and pharmaceutical industries. 2. Background technology [0002] Lac, also known as shellac, is a lac insect parasitic on some leguminous or moraceous plants, such as Dalbergia, Yangqing (Simao Dalbergia), matchlock tree, three-leaf bean, big-leaved banyan, bull ribs and other trees that suck tree. A red substance secreted after juice. Shellac is a natural resin and the only animal resin. Due to its stable chemical performance, non-toxic, non-irritating, good electrical insulation ...

Claims

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Application Information

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IPC IPC(8): C09F1/00C11B11/00
CPCY02W30/74
Inventor 廖亚龙
Owner KUNMING UNIV OF SCI & TECH
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