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Catalyst composition and application thereof to tetramerization of ethylene

A technology of ethylene tetramerization and composition, which is applied in the field of ethylene tetramerization catalyst composition, can solve the problems of poor repeatability of reaction initiation, high production cost, and harsh process requirements in the reaction process, and achieve rapid reaction initiation, increased selectivity, The effect of high reactivity

Active Publication Date: 2017-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum alkoxide (including methylalumoxane, modified methylalumoxane, etc.) as a cocatalyst has the problems of high cost and excessive dosage. When it is applied to ethylene tetramerization on a large scale, it will inevitably lead to production costs. high
Moreover, in the prior art, it is generally believed that water is very unfavorable to the ethylene tetramerization reaction process, so it is necessary to strictly control the reaction in an anhydrous and oxygen-free environment during the production process
This makes all currently known ethylene tetramerization or oligomerization reactions very demanding on the process, resulting in very poor reaction initiation and repeatability of the reaction process

Method used

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  • Catalyst composition and application thereof to tetramerization of ethylene
  • Catalyst composition and application thereof to tetramerization of ethylene
  • Catalyst composition and application thereof to tetramerization of ethylene

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A 300mL stainless steel polymerization kettle is used. Heat the autoclave to 80°C, evacuate and replace with nitrogen several times, then fill with ethylene once, and drop to the set temperature. At 40°C, 1 μmol of bisphosphine ligands (wherein R 1 is methyl, R 2 is ethyl, R 3 , R 4 , R 5 and R 6 Both are phenyl), 1 μmol chromium trichloride, cocatalyst triethylaluminum, tert-butyl hydroperoxide and organic solvent methylcyclohexane, the total volume of the mixed solution is 100mL, based on the weight of the organic solvent , the weight content of tert-butyl hydroperoxide is 25ppm, and the molar ratio of aluminum to chromium is 300. Control the reaction pressure to 4.0MPa, feed ethylene to carry out ethylene tetramerization reaction. After reacting for 0.5 hour, the temperature of the system was cooled to room temperature, the gas phase product was collected in a gas metering tank, and the liquid phase product was collected in an Erlenmeyer flask, and gas chromat...

Embodiment 2

[0034] With embodiment 1, difference is that the weight content of tert-butyl hydroperoxide is 150ppm. See Table 1 for the data.

Embodiment 3

[0036] With embodiment 1, difference is that the weight content of tert-butyl hydroperoxide is 250ppm. See Table 1 for the data.

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Abstract

The invention discloses a catalyst composition for tetramerization of ethylene. The catalyst composition comprises a bisphosphine ligand shown as a formula I, a transition metal compound, an aluminum-containing cocatalyst and t-butyl hydroperoxide, wherein in the formula I, R1 and R2 are each independently selected from alkyl, cycloalkyl or aryl; each of R3, R4, R5 and R6 is independently selected from aryl or cycloalkyl. The invention further discloses a method for tetramerizing the ethylene by using the composition. The catalyst composition can improve the tetramerization activity of the ethylene and the selectivity of 1-octene.

Description

technical field [0001] The invention relates to the field of ethylene oligomerization, in particular to a catalyst composition for ethylene tetramerization. The invention also relates to the application of the catalyst composition in ethylene tetramerization. Background technique [0002] As an important organic raw material and chemical intermediate, 1-octene is mainly used to produce high-quality polyethylene (PE). The linear low-density polyethylene (LLDPE) produced by the copolymerization of 1-octene and ethylene can significantly improve the properties of PE, especially the mechanical properties, optical properties, tear strength and impact strength of polyethylene. , very suitable for packaging films and agricultural covering films such as greenhouses and sheds. At the same time, 1-octene is also used as an intermediate for plasticizers, fatty acids, alcohols for detergents, and lubricating oil additives. [0003] The traditional 1-octene production method is the eth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/24C07C2/36C07C11/02
CPCB01J31/2409B01J2231/20B01J2531/62C07C2/36C07C2531/24C07C11/02
Inventor 吴红飞韩春卉郑明芳王霄青刘珺祁彦平栗同林
Owner CHINA PETROLEUM & CHEM CORP