Process for producing propylene and hexene from C4 olefin streams

A technology of logistics and hexene, applied in chemical instruments and methods, organic chemical methods, hydrocarbon cracking to produce hydrocarbons, etc., can solve problems such as increasing the cost of towers

Inactive Publication Date: 2005-07-13
ABB LUMMUS GLOBAL INC
View PDF8 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Feed mixtures of low concentration also require high recycle through the isomerization section, which increases column cost and requires more energy

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 for producing propylene and hexene from C4 olefin streams
  • Process for producing propylene and hexene from C4 olefin streams
  • Process for producing propylene and hexene from C4 olefin streams

Examples

Experimental program
Comparison scheme
Effect test

example 125

[0076] Example 125 is a feed with a high content of 2-butene in the feed. When there is no pentene recycling, the reaction conversion rate is 35%, and propylene and pentene are produced almost equimolarly by the following reactions:

[0077]

example 148

[0078] Example 148 uses 2-pentene to replace part of 2-butene to simulate component recycling. It can be found that the total pentene produced is reduced by 34% (44 to 29), propylene is increased by 3%, and hexene is increased by 3 times. Obviously, the butene conversion rate has also increased from 35 to 48%, resulting in greater yields of propylene and hexene.

example 119

[0079] Example 119 represents the C of a substantially pure 1-butene feed 4Feed. Under the same operating conditions, the conversion rate is about 45%. However, the selectivity of 7% for propylene and 8% for pentene is low, indicating that the concentration of 1-butene in the feed is high and the lack of any specific isomerization catalyst mixed with the metathesis catalyst. In Example 150, 2-pentene was used instead of some 1-butene. The amount of 2-pentene was slightly less than the 2-pentene produced in the Example 119 reaction. The conversion rate is still basically the same. The pentene cycle has two functions. The increased selectivity of propylene and hexene indicates that 2-pentene reacts with 1-butene. Second, the presence of 2-pentene in the feed inhibits the equilibrium reaction of 1-butene and 2-butene (formed by the self-isomerization of 1-butene on the metathesis catalyst). Therefore, generally, pentene is not formed as the final reaction product. Optionally, it will...

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

Processes the C3 to C6 hydrogen fraction from crackers for self-metathesis conversion of olefins to propylene and hexenes. The mixed n-butene feed is subjected to self-metathesis in the presence of a metathesis catalyst in the absence of ethylene in the feed mixture to the metathesis reactor. Some 2-butene feed fractions can be isomerized to 1-butene and the 1-butene formed and the 1-butene in the feed react rapidly with 2-butene to form propylene and 2-pentene alkene. The feed to the reactor consists of recycled 2-pentene and unreacted butenes formed in the reactor with additional propylene and hexene being formed. In one embodiment, some or all of the 3-hexene formed in the reaction is isomerized to 1-hexene. In another embodiment, a portion of the 3-hexene produced in the main metathesis reaction is reacted with ethylene to produce 1-butene without super-rectification. In another embodiment, the 3-hexene product is hydrogenated and recycled back to the cracking heater.

Description

Background of the invention [0001] The present invention relates to the treatment of C produced by cracking methods such as steam or liquid catalytic cracking 3 To C 6 Hydrocarbon fraction, mainly through self-metathesis to decompose C 4 And C 5 The olefin is converted to propylene. [0002] In a general olefin plant, the first demethanizer is used to remove methane and hydrogen, and then a deethanizer is used to remove ethane, ethylene and C. 2 Alkynes. The bottom material of the deethanizer is made of C 3 To C 6 It is composed of a mixture of carbon number compounds. Fractional distillation is usually used to separate these mixtures into different carbon numbers. [0003] Mainly acrylic C 3 The distillate is removed as a product and finally used to produce polypropylene or for chemical synthesis such as propylene oxide, cumene or acrylonitrile. Fractional distillation or hydrogenation must be used to remove propyne and propadiene (MAPD) ​​impurities. Hydrogenation is preferred b...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07B61/00C07C4/04C07C5/25C07C6/04C07C11/06C07C11/08C07C11/107
CPCC07C5/2512C07C6/04C07C11/107C07C2521/04C07C2521/06C07C2521/08C07C2521/10C07C2523/02C07C2523/16C07C2523/24C07C2523/30C07C2523/32C07C2529/06
Inventor R·J·加特赛德M·I·格林Q·J·琼斯
Owner ABB LUMMUS GLOBAL INC
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