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Catalyst composition, preparation method thereof and application of catalyst composition in reaction for synthesizing 1-butene through ethylene selective dimerization

The technology of a composition and a catalyst, which is applied in catalytic reactions, catalysts, hydrocarbons, etc., can solve the problems of low butene-1 selectivity, expensive catalysts, etc., and achieves a simple preparation method, which is conducive to industrial popularization and application, and reduces The effect of compositing costs

Active Publication Date: 2020-07-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst used in this method is expensive, and in the generated product, the selectivity of butene-1 is low, only 70%, containing a large amount of butene-2

Method used

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  • Catalyst composition, preparation method thereof and application of catalyst composition in reaction for synthesizing 1-butene through ethylene selective dimerization
  • Catalyst composition, preparation method thereof and application of catalyst composition in reaction for synthesizing 1-butene through ethylene selective dimerization
  • Catalyst composition, preparation method thereof and application of catalyst composition in reaction for synthesizing 1-butene through ethylene selective dimerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The dimerization reaction was carried out in a jacketed stainless steel reaction kettle with an effective volume of 300 mL, equipped with a mechanically driven stirring paddle, and adjusted temperature by water circulation. Under ethylene atmosphere and ambient temperature, 50 mL of n-heptane and 5 mL of n-heptane solution of titanium tetrabutoxide compound with a concentration of 0.085 mol / L, 7 mL of AlEt with a concentration of 0.238 mol / L 3 Heptane solution (1 mL of AlEt with a density of 0.84 g / mL 3 Dissolved in 30mL of n-heptane solution) and a mixture of 1.03g 2,6-diphenylpyridine (4.44mmol) and 0.51g 2-methoxythiophene (4.44mmol) were added to the reaction kettle at a temperature of 55°C 1. The reaction of ethylene dimerization into 1-butene is carried out under the condition of 10MPa pressure. After reacting for 30 minutes, stop feeding ethylene, and take a sample to analyze the gas by gas chromatography. The liquid phase in the reactor was then weighed, and t...

Embodiment 2

[0045] Same as Example 1, except that 3.3 mL of 0.085 mol / L n-heptane solution of titanium tetrabutoxide compound was added, so that the Al / Ti molar ratio was 6. The specific reaction conditions and the obtained results are shown in Table 1.

Embodiment 3

[0047] Same as Example 1, except that 3.3 mL of 0.085 mol / L n-heptane solution of titanium tetrabutoxide compound was added to make the Al / Ti molar ratio 6, while controlling the reaction time to 60 min. The specific reaction conditions and the obtained results are shown in Table 1.

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Abstract

The present invention relates to a catalyst composition comprising a titanium compound, an aluminum compound and a Lewis base-type additive; wherein the Lewis base-type additive comprises an amine compound and a sulfur compound. The invention also relates to a preparation method of the catalyst composition. The preparation method comprises the step of mixing the titanium compound, the aluminum compound, the amine compound and the sulfur compound to form the catalyst composition. In addition, the invention also relates to an application of the catalyst composition in a reaction for synthesizing1-butene through ethylene dimerization. According to the present invention, with the method, the high 1-butene selectivity and the polyethylene content tending to zero in the product can be obtained,the catalyst activity and the C4 content in the product are high, the reaction is rapid, the operation is stable, and the repeatability is good.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis, in particular to a catalyst composition, its preparation method and its application in the reaction of ethylene selective dimerization into 1-butene. Background technique [0002] The currently reported catalytic systems for the selective dimerization of ethylene to 1-butene include those based on vanadium, iron or cobalt, tungsten, tantalum, nickel, and titanium. Among these systems, titanium-based catalytic systems are the best. Patent US2943125 by K. Ziegler et al. discloses a method for dimerizing ethylene to 1-butene using a catalyst obtained by mixing trialkylaluminum with zirconium tetraalkoxide. During this reaction, a certain amount of high molecular weight polymer (ie polyethylene) is also formed; this has a rather detrimental effect on the performance of the process. Patent CN1031364A discloses a method for preparing butene-1, including dimerization of ethylene in the prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/14C07C2/36C07C11/08
CPCB01J31/0212B01J31/0229B01J31/0215B01J31/0244B01J31/143C07C2/36B01J2231/20C07C2531/14B01J35/19C07C11/08Y02P20/52
Inventor 王怀杰张海英郑明芳刘珺项迎春
Owner CHINA PETROLEUM & CHEM CORP
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