Temperature-control solvent-free high-selectivity alpha-methyl styrene dimer

A methyl styrene, high-selectivity technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as high prices and affecting product production costs

Active Publication Date: 2008-06-04
无锡市佳盛高新改性材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of ionic liquid [Hmim]BF used in the actual production process 4 , the price is more expensive, which directly affects the production cost of the product

Method used

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  • Temperature-control solvent-free high-selectivity alpha-methyl styrene dimer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Add 17g of N-methylimidazolium tetrafluoroborate and 24g of α-methylstyrene into the reaction flask, stir, heat, control the temperature at 60°C, and react for 24 hours. The reaction solution is allowed to stand still and settle by gravity. The organic layer of the upper floor is separated by liquid separation to obtain the linear dimerization product 2,4-diphenyl-4-methyl-1-pentene, the catalyst in the lower floor is recycled, the conversion rate is 94.7%, and the selectivity of the product is 95%. %.

Embodiment 2

[0011] Example 2: Add 17g of N-methylimidazolium tetrafluoroborate and 24g of α-methylstyrene into the reaction flask, stir, heat, control the temperature to 170°C, and react for 30 hours. The reaction solution is allowed to stand and settle by gravity. The organic layer of the upper layer is separated by liquid separation to obtain the cyclic dimerization product 1,1,3-trimethyl-3-phenylindane, the catalyst in the lower layer is recycled, the conversion rate is 100%, and the selectivity of the product is 100% %.

[0012] The method of the invention is especially suitable for the dimerization of alpha-methylstyrene with high selectivity, and has the advantages of high conversion rate, high selectivity, simple process, recyclable catalyst, environmental friendliness and the like.

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Abstract

The invention discloses a temperature control solventless highly selective alpha-dicymethylstyrene, which is characterized by the following: using tetrafluoride boracic acid N-methyl glyoxaline salt for accelerant; adopting alpha-methylstyrene for raw material; mixing up with accelerant and raw material; reacting at 60deg.c; stewing; carrying on gravitional settling; separating liquor; getting linearity dimer 2, 4-biphenyl-4-methyl-1-amylene by alpha-methylstyrene; using the accelerant(conversion rate: 94.7%; selectivity ratio: 95.0%); reacting at 17deg.c; stewing; carrying on gravitional settling; separating liqor; getting ring dimer 1,1,3-trimethyl-3-phenyl dihydroindene by alpha-methylstyrene; proceeding catalyst circulation(conversion rate: 100%; selectivity ratio: 100%).

Description

technical field [0001] The present invention relates to a temperature-controlled solvent-free high-selectivity α-methylstyrene dimerization method, to be precise, relates to a temperature-controlled solvent-free high-selectivity α-methyl styrene catalyzed by tetrafluoroborate N-methylimidazolium salt. The method for the dimerization of methyl styrene belongs to the technical field of organic chemical reaction methods. Background technique [0002] The linear dimer of α-methylstyrene, 2,4-diphenyl-4-methyl-1-pentene, can be used as molecular weight regulator or chain transfer agent in acrylic coatings, adhesives, ABS, styrene , vinyl chloride, chloroprene and styrene-butadiene rubber, etc., at the same time, the saturated compound after hydrogenation of 2,4-diphenyl-4-methyl-1-pentene can be used as an air cleaner and deodorant , soap, detergent, shampoo and other items, as well as excellent additives for a variety of spices and essential oils. The cyclic dimer 1,1,3-trimet...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C07C2/42C07C2/26C07C13/465C07C15/12
Inventor杨帆裴宝健邹刚汤杰
Owner无锡市佳盛高新改性材料有限公司