Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ethylene-containing pyrolysis gas non-cryogenic separation method and system thereof

A cryogenic separation and gas cracking technology, applied in the field of petrochemical industry, can solve the problem of low cryogenic separation, achieve the effects of reducing energy consumption and equipment requirements, high material recovery rate, and simple process

Active Publication Date: 2018-03-23
BEIJING PETROCHEM ENG
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the energy consumption of this process is lower than that of cryogenic separation, it still requires two refrigeration systems of propylene refrigeration and ethylene refrigeration, and a large amount of absorbent is required to be recycled.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ethylene-containing pyrolysis gas non-cryogenic separation method and system thereof
  • Ethylene-containing pyrolysis gas non-cryogenic separation method and system thereof
  • Ethylene-containing pyrolysis gas non-cryogenic separation method and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Provide a kind of ethylene-containing cracked gas non-cryogenic separation system in embodiment, this separation system comprises:

[0048] The purification gas pipeline (S100) of the reactor discharge gas, the first cooler (E101) is arranged on the purification gas pipeline of the reactor discharge gas, and the first cooler (E101) is used to purify the reactor discharge gas Air cooling to -40°C to 10°C;

[0049] The absorbent pipeline (S107), the absorbent pipeline (S107) is provided with a second cooler (E102) for cooling the absorbent;

[0050] Absorption tower (T101), the inlet of the gas phase material arranged in the middle and lower part of the side wall of the absorption tower is connected with the purified gas pipeline (S100) of the reactor discharge gas, and the inlet of the liquid phase material arranged in the middle and upper part of the side wall of the absorption tower is connected with the absorbent pipeline (S107) is connected, the gas phase material o...

Embodiment 2

[0059] This embodiment provides a non-cryogenic separation method for ethylene-containing cracked gas, which uses the device in Example 1, and its flow chart is shown in figure 1 , the specific process is as follows:

[0060] (1) Pretreatment is carried out to the reactor output gas (the output gas of the cracking furnace of a certain cracking olefin process), and the pretreatment includes chilling, compression, removal of acid gases, alkynes, dienes and drying; and then The purified reactor output gas is introduced into the separation system through the pipeline S100, and the cooler E101 on the pipeline S100 cools the gas to -25°C and then introduces it into the absorption tower T101;

[0061] (2) The top gas of the absorption tower T101 (light components of C2 and below) and the top gas of the desorption tower T102 are exchanged by the cooler E103 and then sent out of the boundary area to obtain the product ethylene-rich gas. The ethylene yield in S102 is 99.9% % or more; t...

Embodiment 3

[0070] This embodiment provides a non-cryogenic separation method for ethylene-containing cracked gas, which uses the device in Example 1, and its flow chart is shown in figure 2 , the specific process is as follows:

[0071] (1) Pretreatment is carried out to the reactor output gas (the output gas of the cracking furnace of a certain cracking olefin process), and the pretreatment includes chilling, compression, removal of acid gases, alkynes, dienes and drying; and then The purified reactor output gas is introduced into the separation system through the pipeline S100, and the cooler E101 on the pipeline S100 cools the gas to -25°C and then introduces it into the absorption tower T101;

[0072] (2) The top gas of the absorption tower T101 (light components of C2 and below) and the top gas of the desorption tower T102 are exchanged by the cooler E103 and then sent out of the boundary area to obtain the product ethylene-rich gas. The ethylene yield in S102 is 99.9% % or more; ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an ethylene-containing pyrolysis gas non-cryogenic separation method and a system thereof. The separation method includes the steps of cooling pretreated ethylene pyrolysis gasto be -40 DEG C to 10 DEGC, and absorbing the gas by an absorption tower; in the absorption tower, subjecting the ethylene pyrolysis gas and a liquid-phase absorbent to countercurrent contact to absorb C3, C4, C5... heavy components of the gas; performing absorption extraction to obtain tower top light-component gas and tower bottom pregnant solution; introducing the tower top light-component gasout of the limit; introducing the tower bottom pregnant solution into a desorber to perform heated desorbing so as to recover C2,C1...light components carried by the gas; in the desorber, returning the tower top gas obtained by means of desorbing into the absorption tower to realize circulating absorption, and introducing the tower bottom solution obtained by means of desorbing out of the limit orinto the subsequent separation procedure. According to the technical scheme, compared with the prior art, the method and the system thereof have the advantages of short processing procedure, low energy consumption, high recovery rate of material, low investment and operation cost and the like.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a non-cryogenic separation method and system for ethylene-containing cracked gas. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry. Polyethylene is produced by ethylene polymerization, ethylbenzene is produced by alkylation with benzene, and ethylene oxide / ethylene glycol is produced by addition reaction with water, oxygen, halogen, etc. etc., to obtain a series of extremely valuable derivatives. The ethylene industry is the core of the petrochemical industry. The proportion of ethylene products in petrochemical products is about 70%, and it occupies an important position in the national economy. The main purpose of ethylene is to produce polyethylene for 50-60%, ethylene oxide for 10-15%, ethylbenzene for 10-15%, and the rest for other chemicals. The ethylene purity requirement for ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07C11/04C07C11/06C07C9/08C07C7/11C07C7/04
CPCC07C7/04C07C7/11C07C11/04C07C11/06C07C9/08Y02P20/50Y02P30/20Y02P30/40
Inventor 陈意心刘汉英付美臻王泽尧
Owner BEIJING PETROCHEM ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com