Polypropylene tail gas recovery device and recovery method

A tail gas recovery and polypropylene technology, applied in the field of polyolefin, can solve the problems of large equipment area, complicated operation, waste of resources, etc., and achieve the effect of small area, low operation energy consumption, and less equipment investment.

Inactive Publication Date: 2015-10-28
DALIAN EUROFILM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to use a vacuum pump to analyze the adsorption tower, and at least two compressors are required to pressurize the recovered hydrocarbon gas and nitrogen respectively. There are many moving equipment and complicated operation. The vacuum analysis process will easily cause air to infiltrate into the recovery system, which is safe. Hidden danger, when the exhaust gas contains a certain concentration of hydrogen, the adsorption process cannot achieve the separation of nitrogen and hydrogen, resulting in nitrogen that cannot be recycled and can only be discharged to the torch, resulting in waste of resources and environmental pollution. At the same time, the equipment occupies a large area

Method used

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  • Polypropylene tail gas recovery device and recovery method
  • Polypropylene tail gas recovery device and recovery method
  • Polypropylene tail gas recovery device and recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] exist figure 1 In the schematic diagram of the process flow for recovering propylene and nitrogen from polypropylene tail gas shown, the pressure of polypropylene tail gas is 0.05MPa, the temperature is 50°C, and the gas volume is 1000Nm 3 / hr, composed as follows:

[0042] components

H 2

Propylene

propane

Vinyl

Hexane

h 2 o

N 2

Content%V / V

1.28

8.10

0.10

6.50

0.25

0.27

83.50

[0043] The tail gas first enters the compression unit 100, and the tail gas compressor 110 raises the pressure of the gas to 1.6MPa, and then enters the circulating water cooler 120 to cool the compressed gas to 40°C. The cooled gas enters the normal-temperature gas-liquid separator 130 for gas-liquid separation, and the condensate delivery device obtained at the bottom; the normal-temperature airflow obtained at the top enters the drying unit 200 . In the drying unit, the gas passes through the adsorption tower, t...

Embodiment 2

[0054] exist figure 1 In the schematic diagram of the process flow for recovering propylene and nitrogen from the polypropylene tail gas shown, the pressure of the polypropylene tail gas is 0.02MPa, the temperature is 51°C, and the gas volume is 900Nm 3 / hr, composed as follows:

[0055] components

H 2

Propylene

propane

Vinyl

Hexane

h 2 o

N 2

Content%V / V

0.60

27.67

5.55

1.40

0.00

0.99

63.79

[0056] The tail gas first enters the compression unit 100, and the tail gas compressor 110 raises the pressure of the gas to 1.7MPa, and then enters the circulating water cooler 120 to cool the compressed gas to 40°C. The cooled gas enters the normal-temperature gas-liquid separator 130 for gas-liquid separation, and the condensate obtained at the bottom passes through the delivery device; the normal-temperature airflow obtained at the top enters the drying unit 200 . In the drying unit, the gas passes thro...

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PUM

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Abstract

The invention discloses a polypropylene tail gas recovery device. The polypropylene tail gas recovery device comprises a compression unit, a drying unit, a membrane separation unit and a cryogenic separation unit, wherein the compression unit, the drying unit, the membrane separation unit and the cryogenic separation unit are connected in sequence. The compression unit comprises at least one compressor, a heat exchanger and a gas and liquid separator, wherein the compressors, the heat exchanger and the gas and liquid separator are connected in sequence. The drying unit comprises at least two adsorption towers which are connected in sequence, and drying agents are placed in the adsorption towers. The membrane separation unit comprises a membrane separator. The cryogenic separation unit comprises at least one high-efficiency multi-channel heat exchanger, at least one low-temperature gas and liquid separator, at least one gas expansion device and at least one liquid expansion device. According to a polypropylene tail gas recovery method adopting expansion refrigeration, propylene in polypropylene tail gas is liquefied to be recovered, and meanwhile nitrogen is purified to meet the requirement for nitrogen recycling; in combination with a membrane separation technology, hydrogen in the polypropylene tail gas is removed; the recovery rate of the propylene in the polypropylene tail gas reaches above 98%.

Description

technical field [0001] The invention relates to the field of polyolefins, in particular to a recovery device and recovery method for propylene and nitrogen in tail gas discharged during the production process of polypropylene. Background technique [0002] In the production process of polypropylene, during the refining of propylene monomer, polymerization reaction and degassing process of polypropylene resin, tail gas containing a large amount of propylene monomer will be discharged. For example, the small stream of light components coming out of the top of the degassing tower during the propylene refining process, and the reaction purge gas used to control the content of inert gases during the polymerization reaction, the mixed gas of nitrogen + steam is sent from the bottom of the degassing chamber to Removal of hydrocarbons and deactivation of residual catalysts resulting in debinning tail gas, etc. These gases are collectively referred to as polypropylene tail gas, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/06
Inventor 马艳勋杜国栋栗广勇李恕广
Owner DALIAN EUROFILM IND
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