Strengthening system and process for preparing polyethylene based on solution method

A polyethylene and solution method technology, applied in the field of strengthening systems, can solve the problems of ethylene cannot be uniformly dissolved and the system conversion rate is low, and achieve the effects of improving the efficiency of material use, ensuring the reaction rate and improving the polymerization efficiency.

Inactive Publication Date: 2021-03-16
NANJING YANCHANG REACTION TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the present invention provides an enhanced system and process for preparing polyethylene based on a solution method to overcome the problem in the prior art that ethylene cannot be uniformly dissolved in a solvent resulting in a low conversion rate of the system

Method used

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  • Strengthening system and process for preparing polyethylene based on solution method

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Effect test

Embodiment 1

[0080] Polyethylene is produced using the system and process described above, wherein:

[0081] The reaction temperature in the reactor is 153° C., the reaction pressure is 2.4 MPa, the solvent is cyclohexane, and the catalyst is Ziegler-Natta catalyst.

[0082] After the system is running, the statistics of the products show that the single-pass conversion rate of ethylene is 96.8%, and the total utilization rate is 98.5%.

Embodiment 2

[0084] Polyethylene is produced using the system and process described above, wherein:

[0085] The reaction temperature in the reactor is 158° C., the reaction pressure is 2.9 MPa, the solvent is cyclohexane, and the catalyst is non-single-site catalyst (SSC).

[0086] After the system is running, the statistics of the products show that the single-pass conversion rate of ethylene is 98.2%, and the total utilization rate is 98.9%.

Embodiment 3

[0088] Polyethylene is produced using the system and process described above, wherein:

[0089] The reaction temperature in the reactor is 162° C., the reaction pressure is 3.2 MPa, the solvent is cyclohexane, and the catalyst is Z-N catalyst.

[0090] After the system is running, the statistics of the products show that the single-pass conversion rate of ethylene is 98.8%, and the total utilization rate is 99.4%.

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Abstract

The invention relates to a strengthening system and process for preparing polyethylene based on a solution method. The strengthening system comprises an ethylene storage tank, a reactor, a micro-interface generator, a killer, a solvent removal tank, a rectifying tower, a flash tank, a separation tank, a first drying tower and a second drying tower. According to the invention, ethylene is crushed to form micron-sized bubbles, and the micron-sized bubbles are mixed with a solvent to form a gas-liquid emulsion, so that the phase interface area of a gas phase and a liquid phase is increased, the thickness of a liquid film is reduced, the mass transfer resistance is reduced, and the mass transfer effect is enhanced within a lower preset operation condition range; and meanwhile, all the micron-sized bubbles can be fully mixed with the solvent to form the gas-liquid emulsion, and ethylene and an initiator in the system can be in full contact with the solvent by fully mixing gas and liquid phases, so that the polymerization efficiency of the system is further improved.

Description

technical field [0001] The invention relates to the technical field of polymer preparation, in particular to an intensified system and process for preparing polyethylene based on a solution method. Background technique [0002] The polyethylene process is divided into low-pressure method and high-pressure method. The low-pressure method is used to produce LLDPE and HDPE. There are three production processes, including slurry method, gas phase method and solution method. The polymer in the slurry process is suspended and insoluble in the alkane diluent; in the gas phase process, the polymer is in the state of solid particles in the stirred bed or fluidized bed; in the solution process, the polymer is dissolved in the solvent . [0003] At present, the polymerization of ethylene is mainly carried out in China by the gas phase method. The gas phase method has low investment and operating costs and less environmental pollution, but the reaction is difficult to control, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F2/06C08F2/01
CPCC08F110/02C08F2/01C08F2/06B01J10/00C08F2/04C08F6/00C08F10/02C08F210/02C08F210/16
Inventor 张志炳李磊周政张锋孟为民王宝荣杨高东罗华勋杨国强田洪舟曹宇
Owner NANJING YANCHANG REACTION TECH RES INST CO LTD
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