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Process flow for carrying out high-pressure and low-pressure adsorption treatments on polyolefin tail gas

A technology of high-pressure polyolefin and process flow, applied in the direction of dispersed particle separation, chemical instruments and methods, separation methods, etc., can solve the problems of low hydrocarbon concentration in hydrocarbon-rich gas, no low-pressure tail gas recovery treatment, recovery benefit discount, etc., to achieve pollution The effect of material reduction

Inactive Publication Date: 2012-03-28
BEIJING SINO HYPRO PETROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process method mainly recovers the high-pressure tail gas after membrane separation, and does not recycle the low-pressure tail gas produced by the polyethylene plant, nor does it include the recovery and treatment of polypropylene tail gas
In addition, the hydrocarbon-rich gas recovered by pressure swing adsorption has relatively low hydrocarbon concentration and can only be used as fuel gas, which greatly reduces the recovery benefit

Method used

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  • Process flow for carrying out high-pressure and low-pressure adsorption treatments on polyolefin tail gas
  • Process flow for carrying out high-pressure and low-pressure adsorption treatments on polyolefin tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] Low-pressure tail gas flow rate of 1500Nm from a polyolefin plant 3 / h, temperature 35°C, pressure 0.11MPa (absolute), high-pressure tail gas flow rate 1000Nm 3 / h, temperature 35°C, pressure 1.1MPa (absolute), the raw material contains 776kg / h of non-methane hydrocarbons, and the tail gas composition is shown in Table-1:

[0043] Table-1 Composition of Raw Gas in Examples

[0044]

[0045] The polyolefin tail gas recovery device for processing the above-mentioned high and low pressure polyolefin tail gas has 4 adsorption beds filled with activated carbon, numbered A, B, C, and D respectively. Table-2 is the work schedule of the adsorption beds:

[0046] Table-2 Example adsorption bed work schedule

[0047]

[0048] The following takes A adsorption bed as an example to explain the entire pressure swing adsorption process.

[0049] Assuming that the adsorption bed A in the pressure swing adsorption device is in the first stage of low-pressure adsorption (LA) at ...

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Abstract

The invention provides a pressure swing adsorption process flow of high-pressure and low-pressure adsorptions, which is used for processing high-pressure polyolefin tail gas and low-pressure polyolefin tail gas generated in the production process of polyolefin and polypropylene to obtain high-concentration hydrocarbon-enriched gas and purified nitrogen gas. The process flow comprises at least four adsorption beds; each adsorption bed is sequentially used for the steps of low-pressure adsorption, high-pressure adsorption, concurrent discharge 1, concentration, vacuumization, vacuum washing, pressurization and the like; the low pressure polyolefin tail gas does not need to be treated by special compression and pressurization so that the cost for investing and operating a device is saved; meanwhile, the operation reliability of a tail gas recycling device is improved.

Description

technical field [0001] The invention relates to a process for treating vented tail gas produced in the production process of polyolefins, especially a process for separating high and low pressure tail gases produced in the production process of polyolefins such as polypropylene and polyethylene, recovering hydrocarbon components and purifying nitrogen process. Background technique [0002] In the production process of polyolefins such as polyethylene and polypropylene, olefin monomers such as ethylene and propylene undergo polymerization reactions to produce solid polyolefin powder. Products of different purposes and polyolefin plants with different production processes will also produce various tail gases during the production process, such as the exhaust gas from the polymerization tank, the exhaust gas from the degassing chamber, the exhaust gas from the dryer, the sealing gas, equipment and Valve leaks gas, etc. Some polyolefin production plants have both polyethylene ...

Claims

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Application Information

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IPC IPC(8): B01D53/02
Inventor 张国瑞
Owner BEIJING SINO HYPRO PETROCHEM TECH
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