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Catalyst composition

A compound and composition technology, applied in the field of preparation of 1-butene, can solve the problems such as the inability to guarantee the continuous and stable operation of the device, the long initial induction period of high polymers, and the influence of the reaction rate, so as to shorten the induction period and improve the space for improvement. The effect of limited position and high product purity

Pending Publication Date: 2022-05-20
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The generation of polymer is a common problem in the ethylene oligomerization process, which can lead to blockage of the pipeline in severe cases, and cannot guarantee the continuous and stable operation of the device
[0005] In addition, in the traditional process of ethylene dimerization into 1-butene, due to the need for complexation between the multi-component catalysts used to form active intermediates, this process affects the reaction rate at the initial stage of the reaction, and the complexation process leads to reaction The initial induction period is too long
The Alpha-Butol process described above has low catalytic activity, about 1 kg of product per gram of titanium, and also has the disadvantages of too long initial induction period and high polymer formation

Method used

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Effect test

Embodiment 1

[0048] This embodiment prepares 1-butene by dimerization of ethylene, comprises the following process:

[0049] Heat the autoclave to a certain temperature, and then vacuumize it. After ensuring that the autoclave used is completely dry, adjust the temperature to 10°C (turn on the external cooling control), seal the autoclave, and use N 2 After replacing the gas in the kettle several times, use ethylene gas to pump out several times. Inject n-heptane solvent, tetrakis (2-ethyl-1,3-hexanediol) titanium (chemical formula: Ti[OCH 2 CH(CH 2 CH 3 )CH(CH 2 CH 2 CH 3 )O] 2 ), diethylaluminum chloride, wherein the molar ratio of diethylaluminum chloride to tetrakis(2-ethyl-1,3-hexanediol)titanium is 1:1, and ethylene is introduced. Under the predetermined reaction temperature of 10°C and reaction pressure of 1.0MPa, react continuously for a period of time. After the reaction, use a wet gas flow meter and a gas collection bag to quantitatively collect the gas phase products, use...

Embodiment 2

[0051] This embodiment prepares 1-butene by dimerization of ethylene, comprises the following process:

[0052] Heat the autoclave to a certain temperature, and then vacuumize it. After ensuring that the autoclave used is completely dry, adjust the temperature to 50°C, seal the autoclave, and use N 2 After replacing the gas in the kettle several times, use ethylene gas to pump it several times, inject n-hexane solvent, tetrakis (2-ethyl-1,3-hexanediol) titanium, triisobutyl aluminum into the kettle, and three The molar ratio of isobutylaluminum to tetrakis(2-ethyl-1,3-hexanediol)titanium is 2:1, and ethylene is introduced. Under the predetermined reaction temperature of 50°C and reaction pressure of 2.0MPa, the reaction was continued for a period of time. After the reaction, the gas phase product was collected quantitatively with a wet gas flow meter and a gas collection bag, and the liquid phase product was collected with a flask. The bags collect the solid-phase products, a...

Embodiment 3

[0054] This embodiment prepares 1-butene by dimerization of ethylene, comprises the following process:

[0055] Heat the autoclave to a certain temperature, and then vacuumize it. After ensuring that the autoclave used is completely dry, adjust the temperature to 55°C, seal the autoclave, and use N 2 After replacing the gas in the kettle several times, use ethylene gas to pump it several times, inject cyclohexane solvent, tetrakis (2-ethyl-1,3-hexanediol) titanium, triethylaluminum into the kettle, and three The molar ratio of ethylaluminum to tetrakis(2-ethyl-1,3-hexanediol)titanium is 4:1, and ethylene is introduced. Under the predetermined reaction temperature of 55°C and reaction pressure of 3.0MPa, react continuously for a period of time. After the reaction, use a wet gas flow meter and a gas collection bag to quantitatively collect the gas phase products, use a flask to collect the liquid phase products, and use a sealed The bags collect the solid-phase products, and th...

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Abstract

The invention discloses a catalyst composition. The catalyst composition comprises an organic titanium compound and an organic aluminum compound, the general formula of the organic titanium compound is Ti [OCHR1CHR2CHR3O] 2; wherein R1, R2 and R3 are independently selected from a hydrogen atom, a C1-20 straight chain or branched chain alkyl group and a non-substituted or substituted aryl group. According to the catalyst composition, in the process of preparing 1-butene through ethylene dimerization, the complexing process can be canceled, the induction period is greatly shortened, the activity and selectivity are improved, and the generation amount of a polymer is reduced.

Description

technical field [0001] The invention relates to the field of preparation of 1-butene, in particular to a catalyst composition for preparing 1-butene by ethylene dimerization. Background technique [0002] 1-butene is the main comonomer of production-type low-density polyethylene (LLDPE) and high-density polyethylene (HDPE). Strong binding force, significantly improve the mechanical properties of polyethylene products such as tensile strength, impact strength, tear resistance and so on. In the industrial process, it is generally necessary to add 1 to 10% comonomer to produce copolymerized polyethylene. [0003] The main methods for industrial production of polymer grade 1-butene are: cracking mixed C4 separation process and ethylene dimerization process. Representative technologies include UOP (cracking C4 separation process) and IFP (ethylene dimerization process). The cracking C4 separation process mainly uses the mixed C4 fraction in the ethylene cracking gas as the raw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/32C07C11/08B01J31/22B01J31/14
CPCC07C2/32B01J31/2213B01J31/143C07C2531/22B01J2231/20C07C11/08
Inventor 曹媛媛王斯晗褚洪岭王力搏徐显明霍宏亮蒋岩王亚丽刘通牟玉强
Owner PETROCHINA CO LTD