Method for preparing propylene from refinery mixed C4

A technology of mixing C4 and propylene, which is applied in the direction of hydrocarbon cracking to hydrocarbon, sustainable manufacturing/processing, only multi-stage series refining and cracking process treatment, etc. Low efficiency and other problems, to achieve the effect of reducing ineffective materials, good technical effects, investment and operating costs

Inactive Publication Date: 2011-05-25
王伟跃
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to produce propylene from the by-product of the refinery preferably the mixed C4 after etherification, and the technical problem to be solved is that in the prior art, the added value of the chemical utilization of the mixed C4 in the refinery is low, and the utilization efficiency of most components is low 、Using the problems of high energy consumption to provide a new method of producing propylene by mixing C4 in refineries

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 preparing propylene from refinery mixed C4
  • Method for preparing propylene from refinery mixed C4
  • Method for preparing propylene from refinery mixed C4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] according to figure 1 As shown, the mixed carbon four composition (weight %) after etherification in the refinery is: isobutane: 40%, n-butane: 15%, butene-1: 17%, butene-2: 28%. The hydroisomerization catalyst used in catalytic distillation is metallic nickel supported on alumina. The catalytic cracking reactor adopts a fixed bed, and the catalyst loaded is a ZSM-5 molecular sieve catalyst. The reaction temperature is preferably 510° C., and the reaction pressure is preferably 0.18 MPa. Unreacted C recycled to catalytic cracking reactor 4 The proportion is 95% (volume), recycled to the C of the catalytic cracking reactor 2 - The proportion of fractions is 95% (volume), and the experiment proves that the propylene product obtained by adopting the device of the present invention to process 100,000 tons of mixed carbon four scale annually is 20,000 tons / year.

Embodiment 2

[0040] according to figure 1 As shown, the mixed carbon four composition (weight %) after etherification in the refinery is: isobutane: 40%, n-butane: 15%, butene-1: 17%, butene-2: 28%. The hydroisomerization catalyst used in the catalytic distillation is aluminum oxide supported metal palladium and zinc. The catalytic cracking reactor adopts a fluidized bed, and the catalyst loaded is a SAPO-34 molecular sieve catalyst. The reaction temperature is preferably 460° C., and the reaction pressure is preferably 0.25 MPa. Unreacted C recycled to catalytic cracking reactor 4 The proportion is 80% (volume), recycled to the C of the catalytic cracking reactor 2 - The proportion of the fraction is 80% (volume), and the experiment proves that the propylene product obtained by adopting the device of the present invention to process 100,000 tons of mixed carbon four scale is 18,000 tons / year.

Embodiment 3

[0042] according to figure 1 As shown, the mixed carbon four composition (weight %) after etherification in the refinery is: isobutane: 40%, n-butane: 15%, butene-1: 17%, butene-2: 28%. The hydroisomerization catalyst used in catalytic distillation is metallic nickel supported on alumina. The catalytic cracking reactor adopts a fixed bed, and the catalyst loaded is a ZSM-5 molecular sieve catalyst. The reaction temperature is preferably 460° C., and the reaction pressure is preferably 0.1 MPa. Unreacted C recycled to catalytic cracking reactor 4 The proportion is 66% (volume), recycled to the C of the catalytic cracking reactor 2 - The proportion of fractions is 85% (volume), and the experiment proves that the propylene product obtained by adopting the device of the present invention to process 100,000 tons of mixed carbon four scale is 17,000 tons / year.

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 preparing propylene from refinery mixed C4, which mainly solves the problems of low added value of the refinery mixed C4, low utilization efficiency of most of components, high energy consumption and the like existing in the prior art. According to the technical scheme, the method is realized by the following steps of: (1) allowing the refinery mixed C4 to pass through a catalytic distillation tower to isomerize butylene-1 into butylene-2, performing tower top separation to obtain light C4, and performing tower kettle separation to obtain heavy C4; (2) feeding the heavy C4 into a catalytic cracking reactor, wherein most of the butylene-2 is converted; (3) compressing a catalytic cracking reaction product and allowing the product to pass through a rectification unit to obtain a main polymer grade propylene product, a cracked gasoline byproduct, unreacted C4 and a C2<-> fraction; and (4) circulating most of the unreacted C4 and the C2<-> fraction to the catalytic cracking reactor. The method can be applied to the industrial field for producing the propylene.

Description

technical field [0001] The invention relates to a method for producing propylene by mixing C4 in a refinery. Background technique [0002] Mixed carbon four is one of the main by-products of refineries. The mixed C4 in the refinery mainly comes from the catalytic cracking unit (FCC), and the total amount of mixed C4 produced by other devices such as visbreaking, thermal cracking and coking is small. The total amount and composition of by-product mixed carbon four in catalytic cracking units vary according to the cracking depth and catalyst. Normally, the amount of mixed carbon four produced by catalytic cracking unit is about 9%-12% (weight) of the fresh feed of the unit, and its composition is characterized by high butane (especially isobutane) content and butadiene content. Very little, butene is about 50% (weight), and the typical composition (weight) is: isobutane: 34%, n-butane: 10%, isobutene: 15%, butene-1: 13%, butene -2: 28%. Most of the refineries utilize ether...

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): C07C11/06C07C4/06C07C9/12C10G55/06
CPCY02P20/10
Inventor 王伟跃
Owner 王伟跃
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