Process and installation for recovery and purification of ethylene produced by pyrolysis of hydrocarbons, and gases obtained by this process

Inactive Publication Date: 2008-03-04
TECHNIP SA
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]According to one of the aspects of the process according to the invention, the hydrogen content of the first head gas current from the de-ethanizer may be increased by the addition of hydrogen from the head of a fluid separator, this fluid coming from the cooling in a heat-exchange zone of the residual gaseous fluid resulting from re

Problems solved by technology

Because of its relative volatility with respect to ethylene and ethane, it cannot be separated by distillation.
The ethylene can then be transformed

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
  • Process and installation for recovery and purification of ethylene produced by pyrolysis of hydrocarbons, and gases obtained by this process
  • Process and installation for recovery and purification of ethylene produced by pyrolysis of hydrocarbons, and gases obtained by this process
  • Process and installation for recovery and purification of ethylene produced by pyrolysis of hydrocarbons, and gases obtained by this process

Examples

Experimental program
Comparison scheme
Effect test

Example

[0039]For FIG. 1, the number 1 designates the feed line of the sufficiently dry pyrolysis gas (for example, 10 ppm water) at a pressure that is selected based on the required hydrogen pressure (for example, 15 to 50 bar, preferably between 28 and 38 bar).

[0040]The typical composition of a gas obtained by ethane cracking is shown in the table below (in mol %):

[0041]CutCutCO / H2CH4C2H2C2H4C2H6C3C4C5+CO2TOTAL36.95.40.334.221.00.60.61.00.6100.00

[0042]This gas is cooled in the multiple-flow beat exchanger 2 and in exchanger 3, respectively, by heat exchange with the cold gases produced by vaporization of the condensates mentioned below and by vaporization of propylene circulating in the traditional cooling loop in a closed circuit.

[0043]The partly condensed gas is supplied to separator 4 at a temperature preferably between −30 and −40° C.

[0044]The gas 5 collected at the head of the separator 4 is further cooled, in the multiple-flow heat exchanger 6, by the cold gases produced by vaporiza...

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

A process for the high-yield recovery of ethylene and heavier hydrocarbons from the gas produced by pyrolysis of hydrocarbons in which the liquid products resulting from the fractionated condensation of a cracking gas for the recovery of almost all the ethylene, are supplied to a distillation column, called a de-ethanizer, at different intermediate levels. At the top of the de-ethanizer the vapor of the column distillate is treated directly in an acetylene hydrogenation reactor, the effluent containing virtually no acetylene being separated by a distillation column called a de-methanizer, into an ethylene- and ethane-enriched tail product, while the head product is recycled by compression or treated for subsequent recovery of ethylene.

Description

FIELD OF THE INVENTION[0001]This invention concerns in general and in a first of its aspects, the chemical industry and, in particular, a method for high-yield recovery and purification of ethylene as well as other products originating from a gas produced by pyrolysis of hydrocarbons. This invention also concerns an installation and equipment for exploiting this method on an industrial scale.BACKGROUND[0002]A large number of papers and patents addressing the production, recovery, and purification of olefins show their industrial importance and the problems encountered in the exploitation of the various processes.[0003]Recently, the production capacity of ethylene units has attained and even exceeded the level of 1 million tons per year for a single line; which requires a new approach in the design of the process, equipment, and the controllability of the unit.[0004]In systems of recovery and purification, particularly for ethylene, the elimination of acetylene is a key element in pu...

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): F25J3/00C10G70/04F25J3/02
CPCC10G70/043F25J3/0219F25J3/0238F25J3/0242F25J3/0252F25J2200/04F25J2205/04F25J2205/30F25J2205/60F25J2205/82F25J2210/12F25J2215/62F25J2245/02F25J2270/04F25J2270/60F25J2270/90Y02P30/40
Inventor KAISER, VICTORLAUGIER, JEAN-PAULSIMON, YVON
Owner TECHNIP SA
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