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
CN101392147AInactive Publication Date: 2009-03-25KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Publication Date
2009-03-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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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