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Method for producing polyethylene by intermittent liquid phase method and polyethylene

A technology of polyethylene and liquid phase method, applied in the field of polyethylene, can solve the problems of complex polymerization process and increase production cost, and achieve the effects of improving economic benefit, reducing production cost and reducing cost.

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, equipment such as a condensate separation tank, a condenser, and a circulating fan must be installed on the polymerization kettle, which makes the polymerization process complicated and increases the production cost.

Method used

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  • Method for producing polyethylene by intermittent liquid phase method and polyethylene
  • Method for producing polyethylene by intermittent liquid phase method and polyethylene

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Experimental program
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Effect test

Embodiment approach

[0034]According to a preferred embodiment of the present invention, the polymerization kettle is provided with a jacket for heating up and removing heat from the polymerization kettle so as to control the polymerization temperature within a predetermined temperature range. Typically, heating the polymerization kettle is achieved by passing hot water into the jacket of the polymerization kettle; removing heat from the polymerization kettle is realized by passing cold water into the jacket of the polymerization kettle. Specifically, during the heating process, a hot water pump is used to send hot water to the jacket of the polymerization kettle to heat up, and the temperature of the kettle is raised from normal temperature to the polymerization temperature, and the polymerization temperature is 50-90°C, preferably 60-80°C; When the temperature rises to the predetermined polymerization temperature, ethylene gas is introduced into the polymerization kettle to start the polymerizati...

Embodiment 1

[0055] Add hydrogen to the polymerization kettle to increase the pressure of the kettle to 0.4 MPa, and fill 26.8 mg of BCE catalyst and 10.0 ml of triethylaluminum solution into the polymerization kettle with 2.0 liters of propane at room temperature. Heat up the temperature of the polymerization kettle through the hot water in the jacket of the polymerization kettle. When the temperature of the polymerization kettle reaches 70°C, the gauge pressure of the polymerization kettle rises to 3.2MPa. Add ethylene to make the pressure of the polymerization kettle rise to 3.5MPa, and start the polymerization reaction; Adjust the flow of cooling water according to the temperature of the polymerization tank to maintain the polymerization temperature. After the polymerization reaction was carried out for 150 minutes, the valve connecting the polymerization kettle and the recovery system was opened, the pressure of the polymerization kettle was released, the unreacted ethylene and propane...

Embodiment 2

[0057] Add hydrogen to the polymerization kettle to increase the pressure of the kettle to 0.6 MPa, and fill 25.7 mg of BCE catalyst and 10.0 ml of triethylaluminum solution into the polymerization kettle with 2.0 liters of propane at room temperature. The jacketed hot water of the polymerization kettle is used to raise the temperature of the reaction kettle. When the temperature of the polymerization kettle reaches 65°C, the gauge pressure of the polymerization kettle rises to 3.0MPa, and ethylene is added to make the pressure of the polymerization kettle rise to 3.3MPa, and the polymerization reaction begins; Adjust the flow of cooling water according to the temperature of the polymerization tank to maintain the polymerization temperature. After the polymerization reaction was carried out for 150 minutes, the valve connecting the polymerization kettle and the recovery system was opened, the pressure of the polymerization kettle was released, the unreacted ethylene and propane...

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Abstract

The invention belongs to the field of olefin, and relates to a method for producing polyethylene by adopting an intermittent liquid phase method and polyethylene. The method comprises the following steps: 1) adding propane and a catalyst into a polymerization kettle; 2) heating the polymerization kettle to a preset polymerization temperature, introducing ethylene gas into the polymerization kettle, and carrying out polymerization reaction; 3) after the polymerization reaction is finished, reducing the pressure of the polymerization kettle to vaporize the unreacted ethylene and propane in the polymerization kettle, condensing the obtained gas phase into a liquid phase material through a recovery condenser, and feeding the liquid phase material into a recovery tank; and 4) after the recovery is finished, spraying the material in the kettle into a flash tank by utilizing the residual pressure in the polymerization kettle to obtain flash gas and polyethylene powder, and discharging the polyethylene powder after discharging the flash gas to obtain the polyethylene. According to the method disclosed by the invention, a polymerization section and a slurry post-treatment section are simplified, and the problem of excessive transition materials in continuous polyethylene production is avoided.

Description

technical field [0001] The invention belongs to the field of olefins, and in particular relates to a method for producing polyethylene by a batch liquid phase method and the polyethylene produced by the method. Background technique [0002] Polyethylene (PE) resin is the variety with the largest output among general-purpose synthetic resins. It has the characteristics of cheap price and good performance, and is widely used in industry, agriculture and other fields. Polyethylene production has always been the coexistence of multiple technologies. The current solution process includes Nova's medium-pressure process, Dow Chemical's low-pressure cooling process and DSM's low-pressure adiabatic process. Slurry process includes Phillips, Solvay's ring tube process and Hurst, Nissan Chemical, Mitsui Chemicals' stirred tank process. The gas phase process mainly includes Unipol process of Univation Company, Innovene process of BP Company and Spherilene process of Basell Company. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F2/06C08F2/01C08F6/10
CPCC08F110/02C08F6/001C08F2500/12C08F2500/07C08F2/06C08F2/01C08L23/06
Inventor 杨芝超杜亚锋张雅茹康鹏仝钦宇郭鹏
Owner CHINA PETROLEUM & CHEM CORP
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