Supported catalyst for preparing hexa-olefin by dimerization of propylene and preparation method of supported catalyst

A technology of supported catalysts and six-carbon olefins, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., and can solve the problem of nickel complex loading methods, which have rarely been reported. And other problems, to achieve high selectivity, high activity, good stability

Inactive Publication Date: 2014-08-27
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are many loading methods for homogeneous catalysts, but there are few reports on the loading methods of (β-ketimine) nickel complexes

Method used

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  • Supported catalyst for preparing hexa-olefin by dimerization of propylene and preparation method of supported catalyst
  • Supported catalyst for preparing hexa-olefin by dimerization of propylene and preparation method of supported catalyst
  • Supported catalyst for preparing hexa-olefin by dimerization of propylene and preparation method of supported catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Preparation of supported catalyst

[0031] The characteristic structure of the (β-ketimine) nickel complex used in the present embodiment 1 is as follows:

[0032]

[0033] In the above structural formula, R is phenyl or substituted phenyl, C 1 ~C 6 Alkyl or substituted alkyl.

[0034] By different substituted amines, a series of (β-ketimine) nickel complexes can be obtained, the steric effect and electronic effect of the complexes can be adjusted, and different dimerization effects can be obtained. When R is t-Bu, the obtained nickel complexes For E, when R is a substituted arylamine, the obtained complex is as follows:

[0035] .

[0036]

[0037] 1) Put the silica gel in a muffle furnace, bake it at 700°C for 6 hours, and seal it after cooling. At this time, the hydroxyl content on the surface of silica gel is 1.12mmol / gSiO 2 the following;

[0038] 2) Under anhydrous and oxygen-free conditions, weigh 3 g of the above-mentioned heat-tre...

Embodiment 2

[0044] Example 2: The propylene dimerization reaction is carried out in a 250mL autoclave, under a propylene atmosphere, 75.3mg of supported catalyst A (its 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), 30mL toluene, temperature is 25°C, stirred for 5min, the gauge pressure of propylene is adjusted to 0.4MPa, and maintained for 60min; the material is extruded, hydrolyzed, and the composition and composition of the product are analyzed by GC. content. The results are shown in Table 2.

Embodiment 3

[0045] Example 3: Ni content is 0.01mmol supported catalyst B, other experimental methods and conditions are the same as Example 2, and the results are shown in Table 2.

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Abstract

The invention discloses a supported catalyst for preparing hexa-olefin by dimerization of propylene and a preparation method of the supported catalyst, and belongs to the technical field of catalysts. The catalyst is prepared from a (beta-ketimine) nickel complex, an organic-aluminum compound, and an inert inorganic compound carrier. The supported catalyst for preparing the hexa-olefin by the dimerization of the propylene is easy to prepare and high in stability; the propylene dimerization conditions are mild; the dimerization can be realized at room temperature and low propylene pressure; the supported catalyst has high activity and high selectivity on the dimerization of the propylene, and is easily separated from a liquid phase product; according to the propylene dimerization performed by utilizing the supported catalyst disclosed by the invention, the catalytic activity can reach 30,000 to 80,000 mol C3<=>/molNi*h; the selectivity of the hexa-olefin obtained by the dimerization is 70 to 90 percent; the content of MP (methyl pentene) in dimerization products is 75 percent.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a supported catalyst for preparing hexacarbon olefins by dimerization of propylene and a preparation method thereof. Background technique [0002] Various six-carbon olefin products obtained by dimerization of propylene are important chemical raw materials and intermediates. Methylpentene is used to synthesize flotation ore air bubbles, and ɑ-hexene is used as a comonomer to prepare modified polyethylene. 2 , 3-dimethylbutene is an important intermediate in the production of certain pesticides and spices. [0003] Several propylene dimerization systems that have been reported are mainly homogeneous systems, such as the nickel naphthenate system of Sumitomo Corporation of Japan, with relatively mild conditions and good selectivity (2,3-dimethylbutene selectivity up to 80%), the activity is 20000-60000h -1 . Another reported 2,4-dithiopentanedione nickel complex sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J31/26C07C2/32C07C11/107C07C11/113
CPCY02P20/52
Inventor 朱银邦牛俊峰毛建卫刘铁兵刘士旺蒋成君李惠
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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