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Method for oligomerization of ethylene

A technology of polyethylene and ethylene, which is applied in the direction of chemical instruments and methods, hydrocarbons, organic compounds/hydrides/coordination complex catalysts, etc., and can solve problems such as production loss and shutdown

Inactive Publication Date: 2015-05-27
SAUDI BASIC IND CORP SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] 2. Unfortunately, it is not possible to completely avoid the formation of polymers or high molecular weight oligomers in the low polyethylene process because this is an inherent side reaction channel
This leads to downtime and thus loss of production

Method used

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  • Method for oligomerization of ethylene
  • Method for oligomerization of ethylene
  • Method for oligomerization of ethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0072] Dry argon for 300 ml pressure reactor equipped with liquid level probe, thermowell, gas entrainment stirrer, cooling coils, control unit for temperature, pressure and stirrer speed (all connected to data acquisition system) Inertization. Ethylene consumption was monitored by means of a computerized data acquisition system by maintaining an isobaric supply of ethylene on a balance through aluminum compressed gas cylinders.

[0073] Before running the experiments, the reactor was heated to 100° C. under reduced pressure for several hours to eliminate traces of water, oxygen and oxidized impurities. Before the reaction, the reactor was cooled to a reaction temperature of 50°C.

[0074] For catalyst preparation, an appropriate amount of PNPNH-ligand (14.7 mg(Ph) 2 P-N( i Pr)-P(Ph)-N( i Pr)-H, Ph = phenyl, iPr = isopropyl), chromium precursor (Cr(acac) 3 , 10.5mg) and modifier dodecyltrimethylammonium chloride (CH 3 (CH 2 ) 11 N(CH 3 ) 3 Cl, 63.5 mg) was weighed an...

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Abstract

The present invention relates to a method for oligomerization of ethylene, comprising the steps: a) feeding ethylene, solvent and a catalyst composition comprising catalyst and cocatalyst into a reactor, b) oligomerizing ethylene in the reactor, c) discharging a reactor effluent comprising linear alpha-olefins including I-butene, solvent, unconsumed ethylene dissolved in the reactor effluent, and catalyst composition from the reactor, d) separating ethylene and 1-butene collectively from the remaining reactor effluent, and e) recycling at least a part of the ethylene and the 1-butene separated in step d) into the reactor.

Description

technical field [0001] The present invention relates to a process for low polyethylene. Background technique [0002] Methods of oligomerizing polyethylene using various catalyst compositions are well known in the art. In general, a broad product distribution and even polymeric material from C4 to higher olefins is obtained if a completely non-specific catalyst is used. Higher linear alpha-olefins and polymeric materials may cause clogging and fouling of oligomerization reactors and piping connected thereto. More recently, catalyst compositions have been developed for oligopolyethylene that are specific for e.g. trimerization or tetramerization, resulting in a narrower product distribution, but still producing higher linear alpha-olefins and polymerizing Material. [0003] WO 2009 / 006979 A2 describes methods and corresponding catalyst systems based on chromium complexes with heteroatom ligands for the dimerization, trimerization and / or tetramerization of ethylene, typical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/36B01J31/16B01J31/18C07C1/08C07C2/08C08F4/02C08F10/02
CPCB01J31/143B01J31/187B01J31/1885B01J2231/20B01J2531/62C07C2/36C07C2531/14C07C2531/24C07C11/08C07C11/107C08F210/16C08F4/22C08F4/69C08F2500/02C07C2/22C07C11/04C08F4/02C07C2/08
Inventor 阿尼纳·韦尔沃尔夫冈·米勒海因茨·伯尔特安德烈亚斯·迈斯温克尔马尔科·哈尔夫安东·韦勒恩霍菲尔卡尔-海因茨·霍夫曼汉斯-约尔格·桑德尔阿博杜尔耶里尔·伊利亚斯沙希德·胡拉姆沙希德·阿扎姆阿卜杜拉·艾尔-卡坦尼
Owner SAUDI BASIC IND CORP SA
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