Supported catalyst for synthesizing 2, 3-dimethyl butene through propylene dimerization and preparation method of supported catalyst

A supported catalyst, dimethyl butene technology, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve high selectivity, high activity, and stability good sex effect

Inactive Publication Date: 2014-09-03
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] There are many ways to support homogeneous catalysts, but there are few reports on the supported catalysts of bis(salicylaldimine) nickel complexes for propylene dimerization

Method used

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  • Supported catalyst for synthesizing 2, 3-dimethyl butene through propylene dimerization and preparation method of supported catalyst
  • Supported catalyst for synthesizing 2, 3-dimethyl butene through propylene dimerization and preparation method of supported catalyst
  • Supported catalyst for synthesizing 2, 3-dimethyl butene through propylene dimerization and preparation method of supported catalyst

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Experimental program
Comparison scheme
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Embodiment 1

[0032] Embodiment 1: Preparation of supported catalyst

[0033] The characteristic structure of two (salicylaldimine) nickel complexes used in the present embodiment 1 is as follows:

[0034]

[0035] In the above structural formula, R 1 is phenyl or substituted phenyl, C 1 ~C 6 Alkyl or substituted alkyl, R 2 for C 1 -C 6 Alkyl or substituted alkyl.

[0036] Two (salicylaldimine) nickel complexes in the above structure can be expressed in various forms, when R 1 When it is phenyl or substituted phenyl, the characteristic structure is as follows:

[0037]

[0038] In the above structure, R 3 , R 4 , R 5 , R 6 for hydrogen, C 1 -C 6 Alkyl or substituted alkyl.

[0039] A series of bis(salicylaldimine)nickel complexes can be obtained by differently substituted ligands. Nickel complexes with different steric hindrances have different steric effects and electronic effects, resulting in different dimerization effects. The various complexes are as follows:

[00...

Embodiment 2

[0049] Example 2: The dimerization reaction of propylene is carried out in a 250mL autoclave, under the atmosphere of propylene, 72.3mg of supported catalyst A (Ni content is 0.01mmol) is added, and 10% Et 3 Al 2 Cl 3 Toluene solution (Al / Ni molar ratio is controlled to be 200), tricyclohexylphosphine (Al / Ni molar ratio is controlled to be 30), and 30mL toluene, the temperature is 25°C, stirred for 5min, and the gauge pressure of propylene is adjusted to 0.4MPa, Maintain for 60 minutes; extrude the material, hydrolyze, and analyze the composition and content of the product by GC. The results are shown in Table 2. In this embodiment 2, tricyclohexylphosphine can also be replaced by triethylphosphine, tri-n-butylphosphine or triphenylphosphine.

Embodiment 3

[0050] Embodiment 3: adopt Ni content to be 0.01mmol supported catalyst B, other experimental methods and conditions are with embodiment 2, and the results are as shown in table 2.

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Abstract

The invention discloses a supported catalyst for synthesizing 2, 3-dimethyl butene through propylene dimerization and a preparation method of the supported catalyst and belongs to the technical field of catalysts. The catalyst is prepared from a bivalent nickel complex (salicylaldiminato), an organic aluminum compound, and an inert inorganic compound carrier. The supported catalyst is easy to prepare and good in stability; the condition of propylene dimerization is moderate and the dimerization reaction can be realized at a room temperature and a relatively low propylene pressure; the catalyst has high activity and relatively high selectivity to the propylene dimerization; by adding organic phosphine, dipolymer mainly containing 2, 3-dimethyl butene is obtained; the supported catalyst and liquid phase product are easy to separate.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a supported catalyst for dimerizing propylene into 2,3-dimethylbutene and a preparation method thereof. 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. It is also a raw material for the production of certain spices such as musk and some other pesticides. In addition, due to its highly branched structure, the hydrogenated product of 2,3-dimethylbutene is also used as an additive in 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, phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J31/22C07C11/107C07C2/32C07C2/22
CPCY02P20/52
Inventor 朱银邦牛俊峰毛建卫刘士旺刘铁兵刘宝鉴肖功年
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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