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Recovery method of hexane in the production process of high density polyethylene

A high-density polyethylene, production process technology, applied in the direction of organic chemistry, fractional condensation purification/separation, etc., can solve the problems of hexane material loss, hexane pollution of the environment, etc., to reduce the amount of N2, solve environmental pollution, good technology effect of effect

Active Publication Date: 2015-09-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that there is a loss of hexane materials in the prior art, and the discharged hexane pollutes the environment, and a new method for recovering hexane in the production process of high-density polyethylene is provided

Method used

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  • Recovery method of hexane in the production process of high density polyethylene
  • Recovery method of hexane in the production process of high density polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] use figure 2 In the shown process, the operating temperature of the hexane exhaust gas of the hexane condenser is reduced from 35°C to -8°C; the operating pressure is 0.01 MPaG. The operating temperature of the catalyst preparation tank is 35°C; the operating pressure is 0.01 MPaG. The operating temperature of the compressor suction tank is -8°C; the operating pressure is 0.001MPaG; the operating temperature of the gas compressor is -8°C rising to 90°C; the operating pressure is increased from 0.001MPaG to 0.40MPaG. The present invention utilizes the existing compressor suction tank and gas compressor equipment to directly send the hexane exhaust gas to the hexane condenser for condensation, the liquid phase of the condensed part is returned to the catalyst preparation tank for reuse, and the hexane of the uncondensed part is discharged The process flow that the suction tank of the air feed compressor is pressurized and then enters the drying gas system, which reduces...

Embodiment 2

[0021] Same as [Example 1], using figure 2 In the process, only the operating conditions were changed, and the operating temperature of the hexane exhaust gas of the hexane condenser was reduced from 38°C to -6°C; the operating pressure was 0.012MPaG. The operating temperature of the catalyst preparation tank is 38° C.; the operating pressure is 0.012 MPaG. The operating temperature of the compressor suction tank is -6°C; the operating pressure is 0.002MPaG; the operating temperature of the gas compressor is -6°C rising to 90°C; the operating pressure is increased from 0.002MPaG to 0.40MPaG. The present invention utilizes the existing compressor suction tank and gas compressor equipment to directly send the hexane exhaust gas to the hexane condenser for condensation, the liquid phase of the condensed part is returned to the catalyst preparation tank for reuse, and the uncondensed hexane exhaust gas The technological process of sending the compressor suction tank to pressuriz...

Embodiment 3

[0023] Same as [Example 1], using figure 2 In the process, only the operating conditions were changed, and the operating temperature of the hexane exhaust gas of the hexane condenser was reduced from 45°C to -5°C; the operating pressure was 0.015MPaG. The operating temperature of the catalyst preparation tank is 45°C; the operating pressure is 0.015MPaG. The operating temperature of the compressor suction tank is -5°C; the operating pressure is 0.003MPaG; the operating temperature of the gas compressor is -5°C rising to 90°C; the operating pressure is increased from 0.003MPaG to 0.40MPaG. The present invention utilizes the existing compressor suction tank and gas compressor equipment to directly send the hexane exhaust gas to the hexane condenser for condensation, the liquid phase of the condensed part is returned to the catalyst preparation tank for reuse, and the hexane of the uncondensed part is discharged The process flow that the suction tank of the air feed compressor ...

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Abstract

The invention relates to a method for recovering hexane from the production of high-density polyethylene, and mainly aiming to solve the problems on the loss of the hexane and the pollution of the discharged hexane to environment in the prior art. The method comprises the following steps: (a) feeding hexane flow 5 into a catalyst preparation tank 1, and mixing the hexane flow 5 with a catalyst, wherein a prepared catalyst 9 is obtained at the bottom of the catalyst preparation tank 1, and a hexane exhaust 6 is obtained on the top of the catalyst preparation tank 1; (b) feeding the hexane exhaust 6 into a suction tank 3 of a compressor to obtain a hexane exhaust 10 with pressure being stabilized; and (c) feeding the hexane exhaust 10 into a gas compressor 4, increasing the pressure to obtain a high-pressure hexane exhaust 11, and feeding the high-pressure hexane exhaust 11 into a subsequent drying gas system. Due to adoption of the technical scheme, the problems are well solved. The method disclosed by the invention can be applied to the industrial production on the recovery of the hexane from the production of the high-density polyethylene.

Description

technical field [0001] The invention relates to a method for recovering hexane in the production process of high-density polyethylene. Background technique [0002] High-density polyethylene (HDPE) is a highly crystalline, non-polar thermoplastic resin with a wide range of uses. Document CN200910090649.6 discloses a preparation method of ultrafine polyethylene powder, and document CN 200910156643.4 discloses a double series reactor process for preparing polyethylene. When producing high-density polyethylene in the prior art, in its catalyst preparation and feeding system, the technical scheme adopted for hexane discharge includes: hexane discharge tank, discharge tank condenser, hexane sealing tank and other equipment, and the technological process is: The hexane exhaust gas is sent to the hexane discharge tank, which is condensed with the discharge tank condenser, and a small amount of uncondensed hexane exhaust gas is sent to the hexane sealed tank, and this part of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/02C08F10/02C07C9/15C07C7/09
Inventor 徐德勤张斌沙裕吕世军何琨崔春霞高毕亚匡顺强
Owner CHINA PETROLEUM & CHEM CORP
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