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Method for synthesis of diisopropenyl by propylene dimerization

A technology for the dimerization of dimethylbutene and propylene, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of expensive co-catalysts for catalyst synthesis raw materials, complex catalyst preparation, and harsh reaction conditions. Achieve the effect of eliminating solvent separation and recovery, simple composition and good stability

Inactive Publication Date: 2004-07-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

These synthetic methods are characterized by high selectivity (~85%) to 2,3-dimethylbutene, but their activity is generally low (up to 70000h -1 ), in addition, in these synthesis methods, there are also disadvantages such as the reaction conditions are too harsh, the preparation of the catalyst is complicated, and the raw materials for catalyst synthesis and the co-catalyst used are relatively expensive.

Method used

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  • Method for synthesis of diisopropenyl by propylene dimerization
  • Method for synthesis of diisopropenyl by propylene dimerization

Examples

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Embodiment 1

[0028] Example 1: In a 250mL autoclave, under a propylene atmosphere, add 0.008mmol of complex C and 0.24mmol of PCy prepared in advance in a Schlenk bottle 3 Ligand (P / Ni molar ratio is 30) and 18mL chlorobenzene solution, after constant temperature to 20°C, add 1.6mmol 10%Et 3 al 2 Cl 3 Toluene solution (Al / Ni molar ratio is 200), stirred for 10min, then adjusted the gauge pressure of propylene to 0.4MPa, and kept the pressure steady for 60min; the material was extruded, hydrolyzed, and the composition and content of the product were analyzed by GC. The results are shown in Table 1.

Embodiment 2

[0029] Embodiment 2: 0.032mmol PCy 3 Ligand (P / Ni molar ratio is 4), other experimental methods and conditions are the same as in Example 1. The results are shown in Table 1.

Embodiment 3

[0030] Example 3: Et 3 al 2 Cl 3 The toluene solution is the cocatalyst, and the Al / Ni mol ratio is 100, and other experimental methods and conditions are the same as in Example 1. The results are shown in Table 1.

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Abstract

A process for preapring 2,3-dimethyl butylene from propylene by dipolymerization features that under the action of catalyst system composed of bis (beta-ketone imine) nickel cobalt match, organoaluminium compound and organophosphine, the organic solution of propylene or liquid propylene takes part in dipolymerizing reaction at 50-100 deg.C for 0.1-6 hr. Its advantages are high reaction activity and selectivity.

Description

technical field [0001] The invention relates to a method for dimerizing propylene into 2,3-dimethylbutene. Background technique [0002] 2,3-Dimethylbutene (2,3DMB) is an important fine chemical raw material and intermediate. At present, 2,3-dimethylbutene is mainly used to produce the pesticide fenpropathrin. At the same time, 2,3-dimethylbutene is also a raw material for the production of certain spices such as musk and other pesticides. In addition, due to its highly branched structure, the hydrogenated product of 2,3-dimethylbutene is also used as an additive to gasoline to increase its octane number. [0003] The synthesis methods of 2,3-dimethylbutene include chemical method and propylene dimerization method. Chemical synthesis of 2,3-dimethylbutene is an earlier research process, mainly including acetone dimerization method, β-bromoether synthesis method, alcohol dehydration method, photolysis method and aldehyde condensation method, Grignard reagent method, these ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/28C07C11/107
CPCY02P20/52
Inventor 吴思忠陆世维
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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