Unlock instant, AI-driven research and patent intelligence for your innovation.

A preparation method for improving terminal olefin selectivity

A technology of terminal olefins and selectivity, which is applied in the preparation of olefins and the field of preparation of improving the selectivity of terminal olefins, which can solve the problems of increased product complexity, increased separation difficulty, and reduced raw material utilization efficiency, so as to reduce difficulty and improve utilization rate effect

Active Publication Date: 2019-09-03
WANHUA CHEM GRP CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only reduces the utilization efficiency of raw materials, increases the complexity of the product, but also increases the difficulty of separation.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A preparation method for improving terminal olefin selectivity
  • A preparation method for improving terminal olefin selectivity
  • A preparation method for improving terminal olefin selectivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of methyl erucate

[0054] Add 300ml of methanol and 33.86g (100.0mmol) of erucic acid (cis-docos-13-enoic acid) into the reaction tube, then add 0.5g of p-toluenesulfonic acid, reflux at 50°C for 3h, pass through 26.45 g (85.3 mmol) of methyl erucate were obtained by rectification separation, with a yield of 85.3% and a purity of 98.3 wt%.

Embodiment 2

[0056] Preparation of Ethyl Neuranate

[0057] Add 320ml of ethanol and 36.62g (100.0mmol) of nervonic acid (cis-15-tetradecenoic acid) into the reaction tube, then add 0.6g of p-toluenesulfonic acid, and react at reflux at 60°C for 3h. Ethyl nervate 32.88g (83.2mmol) was separated by distillation, with a yield of 83.2% and a purity of 98.6wt%.

Embodiment 3

[0059] Preparation of ethyl eicosenoate

[0060] Add 350ml of ethanol and 31.05g (100.0mmol) eicosenoic acid (cis-13-eicosenoic acid) into the reaction tube, then add 0.5g of concentrated sulfuric acid, reflux at 60°C for 2h, after the reaction is completed, pass through the Distillation and separation obtained 28.96 g (87.6 mmol) of ethyl eicosenoate, with a yield of 87.6% and a purity of 98.2 wt%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a preparation method for improving the selectivity of terminal olefins. The characteristic of this method is that microwave reactor is used as raw material, and internal olefins are used as raw materials to undergo cross-metathesis reaction with α-olefins under the action of catalysts. By adjusting microwave output power and microwave radiation reaction time, the distribution of products can be changed and the selection of products can be improved. sex. Compared with the traditional method, the present invention can not only improve the selectivity of products, reduce the difficulty of separation, but also realize the selective preparation of specific products; in addition, the method can also reduce the catalyst consumption and cost, and has wide industrial application value.

Description

technical field [0001] The invention relates to a method for preparing olefins, in particular to a method for improving the selectivity of terminal olefins, and belongs to the field of organic synthesis. Background technique [0002] Olefin metathesis refers to a type of reaction in which carbon-carbon unsaturated bonds are cut and recombined under the action of metal catalysts. According to different types of reactions, it can be divided into cross-metathesis (CM), ring-closing metathesis (RCM), and ring-opening metathesis. Polymerization metathesis (ROMP), etc. Metathesis reactions have great application potential in polymer materials, chemistry, chemical industry, food, medicine and biotechnology industries. Industrially, heterogeneous tungsten and / or rhenium oxides are used as catalysts to convert ethylene and 2-butene into propylene by metathesis. [0003] Fatty acid esters (FAME) undergo cross-metathesis reactions with α-olefins, which can be used to prepare long-cha...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/333C07C69/533C07C2/88C07C11/02
Inventor 杜旺明陈海波张彦雨边新建鞠昌迅赵文娟黎源
Owner WANHUA CHEM GRP CO LTD