New method of extracting gutta-percha in leaf, peel and seed shell waste residues of eucommia

Abstract

The invention discloses a new method of extracting gutta-percha in leaf, peel and seed shell waste residues of eucommia. The method comprises the steps of drying the leaf, peel and seed shell waste residues through fluidized bed drying unit so as to be beneficial for pelletizing and digesting an organic solvent, pelletizing to form a raw material for extracting the gutta-percha through a pelletizing unit, beneficially digesting subcritical fluid and increasing the feeding capacity by particle raw materials, and extracting color-free, toxic-free, tasteless and combustion-explosion-free R134a subcritical fluid by subcritical supersonic extraction equipment. Therefore, the digestion capacity can be greatly improved by the subcritical supersonic extraction, the defects that the petroleum ether is inflammable, explosive and greatly dangerous when the petroleum ether is extracted in a conventional method can be prevented by selecting the R134 subcritical fluid, an extraction solution can naturally recover a (condensed) solvent to obtain an thick gutta-percha paste through the temperature and pressure control, a fine thick paste can be obtained by carrying out crystallization, purification, drying and integrated tank processing to the thick gutta-percha paste, i.e. the purification process of crystallization, de-coloration and re-crystallization can be completed in the integrated pot.

Description

technical field [0001] The invention relates to the field of raw material extraction and preparation, in particular to a new method for extracting eucommia gum from waste residues of eucommia leaves, bark and seed shells. Background technique [0002] Eucommia ( Eucommia ulmoides Oliv. ) is a plant of the genus Eucommia in the family Eucommia. Eucommia gum is rich in Eucommia bark, leaves and fruits. There are more than 700,000 hectares of Eucommia trees planted in my country, which is a new renewable resource of natural rubber. Eucommia gum is extracted from Eucommia ulmoides and other plants, and its main component is trans-1,4-polyisoprene (TPI for short). TPI itself has many unique characteristics. It is hard plastic at room temperature and has a fixed shape. It is rubbery above 60°C and can produce various deformations. It is an excellent shape memory functional material; when the crosslinking degree reaches a certain When it reaches a certain degree, it becomes a c...

AI Technical Summary

Problems solved by technology

At present, the extraction methods of eucommia gum production include alkaline extraction method, solvent method and enzymatic hydrolysis method, etc. Most of these methods directly use eucommia fruit, bark and eucommia leaves. The shortcomings of low production rate and serious environmental pollution, especially the high production cost, high risk, and serious environmental pollution have prevented the effective promotion and application of Eucommia gum in my country.