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Process for the preparation of polyisoprene

一种聚异戊二烯、乙二醇二甲醚的技术，应用在分离方法、化学仪器和方法、溶剂萃取等方向，能够解决致癌性、环境负荷大、降低聚异戊二烯成分回收率等问题，达到控制影响、提高生产效率的效果

Active Publication Date: 2020-04-21
HITACHI ZOSEN CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this method requires a large amount of various organic solvents and heat energy, it cannot avoid high costs and a large environmental load.
In addition, toluene is carcinogenic, which will also cause safety problems for on-site operators
In addition, pigments such as chlorophyll from plant tissues were extracted by toluene at the same time. Therefore, several additional processes were required to remove the pigment components. On the whole, the recovery rate of polyisoprene components was likely to be greatly reduced.

Method used

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  • Process for the preparation of polyisoprene
  • Process for the preparation of polyisoprene

Examples

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preparation example Construction

[0053] figure 1 is a fabrication drawing illustrating an example of the method of the present invention.

[0054] First, in the present invention, a pretreatment solvent ( figure 1 The pretreatment procedure 12) in. The crushed body is crushed by a crushing means known to those skilled in the art (such as a pulverizer, a paddy peeling machine) to a predetermined particle diameter. The crushed body can also be obtained by chemical treatment (such as alkali treatment) or preservation by using microorganisms. By using the crushing means to crush the plant body containing polyisoprene, the tissue structure inside the plant is destroyed, and the polyisoprene component that is usually sealed in the milk duct cells can be improved in the subsequent process ((A ) process) the probability of exposure to organic solvents. In addition, pigment components such as chlorophyll and fat-soluble components in the pretreatment process can be more easily removed by destroying the plant tissu...

Embodiment 1

[0079] For Eucommia ulmoides, a temperate tree that produces trans-polyisoprene, samara harvested in the fall of 2014 were thoroughly dried. Afterwards, the seeds are separated from the peel in a paddy peeling machine (in addition, it is known that the peel of Eucommia contains about 10% to about 25% by weight of trans polyisoprene on a dry weight basis). The pericarp obtained by this operation is broken into particles with a maximum diameter of about 2 mm. This crushed product was used as a sample in the following steps.

[0080] Put 10 g of the obtained sample into a round-bottomed flask, add 250 ml of ethylene glycol dimethyl ether as a solvent at room temperature, and stir for 6 hours at room temperature with a stirrer at a speed of 120 rpm to 180 rpm.

[0081] Next, the solvent was taken out by the nitrogen pressure of the cannula, and 120 ml of ethylene glycol dimethyl ether was added to the residue, and the contents were stirred for several seconds with a stirrer, and ...

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Abstract

The present invention is a method for preparing polyisoprene, which includes the following steps: (A) mixing plant tissue containing polyisoprene and an organic solvent at a temperature of 60°C to 80°C to prepare polyisoprene solution; and (B) reducing the temperature of the polyisoprene solution to 0°C to 30°C, and precipitating the polyisoprene from the polyisoprene solution. The organic solvent is ethylene glycol dimethyl ether.

Description

technical field [0001] The present invention relates to a method for preparing polyisoprene, and in particular, relates to a method for efficiently preparing polyisoprene from predetermined plant tissues. Background technique [0002] Polyisoprene is a high molecular compound (polymer of isoprene) produced in higher land plants. Polyisoprene can be divided into cis-polyisoprene and trans-polyisoprene according to its three-dimensional structure. [0003] Here, examples of plants that produce long-chain cis-polyisoprene include rubber trees (Hevea brasiliensis) of Euphorbiaceae that produce natural rubber, Russian dandelion (Taraxacum koksaghyz) of Compositae, guayule ( Parthenium argentatum), Periploca sepium of Apocynaceae, etc. In contrast, as plants that produce long-chain trans-polyisoprene, there are only a few species, such as Eucommiaulmoides in the Eucommia family, Mimusops balata in the Sapotaceae family, and Guta Hard gum (Palaquium gutta) and the like (Non-Pate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C2/02
CPCC08C2/02B01D11/0415B01D11/0492C08C4/00C08F136/08B01D11/028B01D11/0288
Inventor 柚木功铃木伸昭武野真也中泽庆久马场健史
Owner HITACHI ZOSEN CORP