Method for synthesizing short-chain olefin by ethylene oligomerization

A technology of ethylene oligomerization and oligomerization, which is applied in the field of olefin oligomerization, can solve the problems of difficult separation of catalyst and product, difficult synthesis of catalyst, poor stability, etc., and achieve the effects of improved catalytic activity, good thermal stability, and high activity
CN101200404AInactive Publication Date: 2008-06-18SUN YAT SEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUN YAT SEN UNIV
Publication Date
2008-06-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for a short chain olefin hydrocarbon through an ethylene oligomeric. The invention is characterized in that: the dual salicylaldehyde imine nickel catalyst is loaded in imidazole Al-ionic ionic liquid; under the assistant catalysis of AlEt2Cl, the ethylene oligosaccharide can be catalyzed in two phase in a mild reaction condition. Comparing with a homogeneous system, the activity of the catalyst system in the ionic liquid can be improved greatly; all generative products are ethylene oligomeric, and the production can be separated through a simple settlement. The ionic liquid of the catalyst can be recycled by being dissolved. The reaction condition has no great impact to the distribution of the oligomeric production. The test result of gas chromatography mass spectrum that the ethylene oligomeric production mainly is a short chain olefin hydrocarbon with the carbon atom of less than 10. Compared with the tradition of salicylaldehyde imine nickel catalyst 1 and 2, the catalyst 3 and 4 after the ion function has a higher activity and a better thermal stability. The test for atomic emission spectroscopy of the plasma shows that the recovery rate of catalyst 1 and 2 can be more than 98 percent, while that of the catalyst 3 and 4 after the ion function can reach 99.9 percent.
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Description

technical field

[0001] The invention relates to the field of olefin oligomerization, in particular to a method for preparing short-chain olefins by using a catalyst to catalyze ethylene oligomerization. Background technique

[0002] Ethylene oligomerization is an important petrochemical industry. Short-chain olefins synthesized through ethylene oligomerization are an important class of chemical raw materials. According to different chain lengths, they are widely used in detergents, plasticizers, lubricating oils, surfactants, etc. There are a wide range of uses. Alternatively, linear alpha-olefins (LAO) can be used as comonomers (such as 1-butene, 1-hexene, and 1-octene) to be copolymerized with ethylene to produce various commercial brands of branched polyethylene (LLDPE) or elastomeric body material.

[0003] At present, the ethylene oligomerization catalysts in the industry are mainly the alkylaluminum catalysts of BP Amoco, the nickel catalysts of Shell's SHOP process,...

Claims

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