Method for reclaiming ethylene in catalytic dry gas

A dry gas and ethylene technology, applied in chemical instruments and methods, liquefaction, organic chemistry, etc., can solve the problems of high energy consumption, large investment and large equipment scale, and achieve the effect of low energy consumption, less investment and less equipment

Active Publication Date: 2010-01-27
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problems of high energy consumption, large equipment scale and large investment in the exist

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
  • Method for reclaiming ethylene in catalytic dry gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment further explains the method of the present invention by taking the recovery of ethylene from a refinery catalytic dry gas as an example, and the composition of the catalytic dry gas is listed in Table 1.

[0033] Table 1 Composition of catalytic dry gas in a refinery

[0034]

[0035] (1) Catalytic dry gas cooling: The catalytic dry gas with a flow rate of 13504 kg / h passes through the purification system 8 and the dryer 9 to remove carbon dioxide, oxygen, NOx and water, and then enters the cold box 7 . After the catalytic dry gas is cryogenically cooled to -105°C, it enters the heavy hydrocarbon separation tank 10 . The gaseous phase with a mass flow rate of 7495kg / h at the top of the tank enters the cold box 7 again to continue deep cooling, and the liquid phase at the bottom of the tank with a mass flow rate of 5003kg / h is directly sent to the methane tower 11. The temperature of the gas phase after being cryogenically cooled again is -142°...

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 discloses a method for reclaiming ethylene in catalytic dry gas, belongs to an ethylene separation method, and provides the method for separating the ethylene from the catalytic dry gas by using mixed gas as refrigerant in order to solve the problems that the prior process for reclaiming the ethylene from the dry gas of a refinery has high energy consumption, large equipment scale, high investment and the like. The method adopts an expander and an ice chest to reclaim cold energy through three-stage compression and refrigeration, and then obtains material flow rich in the ethylene from a tower bottom by removing methane and hydrogen in a methane removing tower so as to greatly improve the reclamation rate of the ethylene and reduce the energy consumption. The method of the invention has the advantages of less equipment, simple flow, simple refrigeration cycle and less investment.

Description

technical field [0001] The invention relates to a method for separating ethylene, more specifically, the invention relates to a method for recovering ethylene in catalytic dry gas. Background technique [0002] Refinery dry gas refers to the gas products produced by catalytic cracking, thermal cracking, delayed coking and other devices in refineries after absorption and separation 3 The remaining gas components after the above heavy components. In addition to containing inert gases such as nitrogen and carbon monoxide and acid gases such as carbon dioxide and hydrogen sulfide, it is also rich in heavy hydrocarbons such as hydrogen, methane, ethylene, ethane and a small amount of propylene, and is an important source of basic chemical raw materials. Rational use of refinery dry gas is an important way to improve refinery processing depth and economic benefits. Refinery dry gas usually contains 10-20% ethylene and 10-25% ethane, as well as useful components such as propylene...

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): C07C11/04C07C7/00C07C7/09
CPCF25J3/0219F25J3/0233F25J3/0238F25J3/0252F25J2200/70F25J2205/04F25J2210/12F25J2215/62F25J2270/04F25J2270/18F25J2270/66
Inventor 程建民过良李东风廖丽华刘智信王婧李晓锋李琰
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap