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System and method for preparing polymer-grade ethylene and polymer-grade propylene by separating cracked gas

A polymer grade propylene and cracking gas technology, applied in chemical instruments and methods, absorption purification/separation, hydrocarbon purification/separation, etc., can solve the problems of equipment investment increase, equipment investment increase, refrigerant energy consumption, etc., to reduce Effects of energy consumption, equipment investment saving, and process simplification

Pending Publication Date: 2022-07-01
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In this conventional cryogenic separation method, C3 and lighter components, C2 and lighter components need to be compressed to enter the deethanizer and demethanizer for separation, which consumes a lot of energy and requires additional Two compressors or adding a special compression section to the product gas compressor will lead to an increase in equipment investment; at the same time, ethylene-propylene binary refrigeration is required, and the energy consumption of the refrigerant is high, which also leads to an increase in equipment investment

Method used

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  • System and method for preparing polymer-grade ethylene and polymer-grade propylene by separating cracked gas
  • System and method for preparing polymer-grade ethylene and polymer-grade propylene by separating cracked gas
  • System and method for preparing polymer-grade ethylene and polymer-grade propylene by separating cracked gas

Examples

Experimental program
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Effect test

Embodiment 1

[0072] using as figure 1 Shown is the process flow of the system and method for separating and producing polymer-grade ethylene and polymer-grade propylene from cracked gas.

[0073] like figure 1 As shown, the system for separating and producing polymer-grade ethylene and polymer-grade propylene from cracked gas includes: depropanizer 2, dehexane tower 4, debutanizer 5, deethanizer 6, demethanizer 7, ethylene tower 9 , propylene tower 8, absorption tower 10, desorption tower 13;

[0074] The cracked gas feed line is connected with the depropanizer 2, the cracked gas feed line is provided with a first compressor 1, and the first compressor 1 is connected with the depropanizer 2;

[0075] After the top of the depropanizer 2, a deethanizer 6, a demethanizer 7, an absorption tower 10, and a desorber 13 are sequentially set, and a dehexane tower 4 and a butanizer 5 are sequentially set after the tower reactor; the dehexane tower 4 The top of the tower is connected with the debu...

Embodiment 2

[0087] using as figure 2 Shown is the process flow of the system and method for separating and producing polymer-grade ethylene and polymer-grade propylene from cracked gas.

[0088] like figure 2 As shown, the system for separating and producing polymer-grade ethylene and polymer-grade propylene from cracked gas includes: depropanizer 2, dehexane tower 4, debutanizer 5, deethanizer 6, demethanizer 7, ethylene tower 9 , propylene tower 8, absorption tower 10, desorption tower 13;

[0089] The cracked gas feed line is connected with the depropanizer 2, the cracked gas feed line is provided with a first compressor 1, and the first compressor 1 is connected with the depropanizer 2;

[0090] After the top of the depropanizer 2, a deethanizer 6, a demethanizer 7, an absorption tower 10, and a desorber 13 are sequentially set, and a dehexane tower 4 and a butanizer 5 are sequentially set after the tower reactor; the dehexane tower 4 The top of the tower is connected with the de...

Embodiment 3

[0100] using as image 3 Shown is the process flow of the system and method for separating and producing polymer-grade ethylene and polymer-grade propylene from cracked gas.

[0101] like image 3 As shown, the system for separating and producing polymer-grade ethylene and polymer-grade propylene from cracked gas includes: depropanizer 2, dehexane tower 4, debutanizer 5, deethanizer 6, demethanizer 7, ethylene tower 9 , propylene tower 8, absorption tower 10, desorption tower 13, and stabilization tower 14;

[0102] The cracked gas feed line is connected with the depropanizer 2, the cracked gas feed line is provided with a first compressor 1, and the first compressor 1 is connected with the depropanizer 2;

[0103] After the top of the depropanizer 2, a deethanizer 6, a demethanizer 7, an absorption tower 10, a desorption tower 13 and a stabilization tower 14 are sequentially arranged, and a dehexane tower 4 and a butanizer 5 are sequentially arranged after the tower reactor...

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Abstract

The invention belongs to the field of oil absorption separation methods for catalytic cracking gas, and relates to a system and a method for preparing polymer-grade ethylene and polymer-grade propylene by cracking gas separation. The system comprises a depropanizing tower, a hexane removal tower, a debutanizing tower, a deethanizing tower, a demethanizing tower, an ethylene tower, a propylene tower, an absorption tower, a desorption tower and an optional stabilizing tower, a pyrolysis gas feeding pipeline is connected with the depropanizing tower, and a first compressor is arranged on the pyrolysis gas feeding pipeline; a deethanization tower, a demethanization tower, an absorption tower, a desorption tower and an optional stabilization tower are sequentially arranged behind the top of the depropanization tower, and a hexane removal tower and a debutanization tower are sequentially arranged behind a tower kettle; and a second compressor is arranged on a pipeline connected between the depropanizing tower and the deethanizing tower or a pipeline connected between the deethanizing tower and the demethanizing tower. The invention provides a system and a method for effectively separating catalytic cracking gas by adopting a shallow cold oil absorption method, which are energy-saving and can save equipment investment.

Description

technical field [0001] The invention belongs to the field of oil absorption and separation methods for catalytic cracking gas, and more particularly relates to a system and method for separating and producing polymer-grade ethylene and polymer-grade propylene by using shallow cooling oil absorption method instead of traditional cryogenic separation method. Background technique [0002] Catalytic cracked gas mainly contains hydrogen, methane, carbon 2, carbon 3, carbon 4 and carbon 5 and heavier components, which are generally separated by traditional cryogenic rectification separation method of pressurization and condensation of low temperature refrigerant. The commonly used process flow is as follows: first, the catalytic cracking product gas is compressed to 1.0MPa-2.0MPa with the first compressor, and then the gas phase and the condensate between the compressor sections are sent to the depropanizer, and the C3 and lighter components are It is separated from C4 and heavier...

Claims

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Application Information

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IPC IPC(8): C07C7/04C07C7/11C07C7/00C07C11/04C07C11/06
CPCC07C7/04C07C7/11C07C7/00C07C11/04C07C11/06
Inventor 时海涛王鑫泉
Owner SINOPEC ENG