A kind of method for preparing propylene by catalytic cracking of n-butene

A catalytic cracking and n-butene technology, which is applied in chemical instruments and methods, hydrocarbon cracking to produce hydrocarbons, molecular sieve catalysts, etc., can solve the problems of low single-pass yield of the target product propylene and the need to further improve the propylene yield, and achieve high propylene The effect of one-way yield, increased holding capacity, and enhanced stability

Active Publication Date: 2019-06-11
CHINA PETROLEUM & CHEM CORP +1
View PDF18 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The ZSM-5 molecular sieve catalyst adopted in the prior art scheme still has the deficiency that the single-pass yield of the target product propylene is low. Through the catalyst modification method described in the above-mentioned documents, the single-pass yield of propylene can be appropriately improved, but the propylene yield is still low. room for further improvement

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
  • A kind of method for preparing propylene by catalytic cracking of n-butene
  • A kind of method for preparing propylene by catalytic cracking of n-butene
  • A kind of method for preparing propylene by catalytic cracking of n-butene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The specific preparation process of modified ZSM-5 molecular sieve F1 is as follows: (1) 8.5 g of zirconyl nitrate and 0.8 g of chloroiridic acid were dissolved in 22 ml of deionized water, and the obtained saline solution was added to 650 ml of n-hexane solvent, Stirring was continued for 1 hour to form a suspension A1. Add 114.5 g of Si / Al molar ratio 76, pore volume 0.19 cm to suspension A1 3 / g hydrogen ZSM-5 molecular sieve, stirred at room temperature (25°C) for 2 hours to obtain slurry B1. (2) Place the slurry B1 in a rotary evaporator, evaporate the n-hexane solvent to dryness, and obtain dry glue C1, dry at room temperature (25°C) for 24 hours, dry at 120°C for 12 hours, and then bake at 650°C for 5 hours, ZSM-5 molecular sieve D1 containing zirconium and iridium was obtained. (3) Transfer D1 into 500 ml of 0.1 mol / L ammonium sulfate solution and soak for 5 hours. After the required soaking time is reached, filter out the ammonium sulfate solution and rinse t...

Embodiment 2

[0037] The specific preparation process of modified ZSM-5 molecular sieve F2 is as follows: (1) 9.5 g of zirconyl nitrate and 0.5 g of chloroiridic acid were dissolved in 26 ml of deionized water, and the resulting saline solution was added to 520 ml of cyclohexane solvent , stirring continuously for 1 hour to form suspension A2. Add 113.0 g of Si / Al molar ratio 54, pore volume 0.23 cm to suspension A2 3 / g hydrogen ZSM-5 molecular sieve, stirred at room temperature (25°C) for 2 hours to obtain slurry B2. (2) Place the slurry B2 in a rotary evaporator and evaporate the cyclohexane solvent to obtain dry glue C2, dry it at room temperature (25°C) for 24 hours, dry it at 120°C for 12 hours, and then bake it at 600°C After 10 hours, ZSM-5 molecular sieve D2 containing zirconium and iridium was obtained. (3) Transfer D2 into 500 ml of 0.5 mol / L ammonium sulfate solution and soak for 1 hour. After the required soaking time is reached, filter out the ammonium sulfate solution and r...

Embodiment 3

[0039] The specific preparation process of modified ZSM-5 molecular sieve F3 is as follows: (1) 11.2 g of zirconyl nitrate and 1.1 g of chloroiridic acid were dissolved in 23.7 ml of deionized water, and the resulting saline solution was added to 950 ml of cyclohexane solvent , stirring continuously for 1 hour to form suspension A3. Add 114.5 g of Si / Al molar ratio 93, pore volume 0.21 cm to suspension A3 3 / g hydrogen ZSM-5 molecular sieve, stirred at room temperature (25°C) for 2 hours to obtain slurry B3. (2) Place the slurry B3 in a rotary evaporator and evaporate the cyclohexane solvent to obtain dry glue C3, dry at room temperature (25°C) for 24 hours, dry at 120°C for 12 hours, and then bake at 630°C After 10 hours, ZSM-5 molecular sieve D3 containing zirconium and iridium was obtained. (3) Transfer D3 into 500 ml of 0.3 mol / L sulfuric acid solution and soak for 3 hours. After the required soaking time is reached, filter out the sulfuric acid solution and rinse the mo...

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

PropertyMeasurementUnit
boiling pointaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method of preparing propylene by catalytic cracking of n-butene. Under a catalytic cracking condition, a n-butene-containing raw material successively passes through an FER molecular sieve catalyst bed layer and a modified ZSM-5 molecular sieve catalyst bed layer, wherein the filling mass ratio of an FER molecular sieve catalyst and a modified ZSM-5 molecular sieve catalyst is (1:1) to (3:1); the catalytic cracking conditions are as follows: the reaction temperature is 450-550 DEG C, preferably 450-500 DEG C, the total pressure of the reaction is 0-0.5MPa, and the weight space velocity is 1-10 / h; and the modified ZSM-5 molecular sieve comprises the following components in percentages by weight: 4.5-6.0% of zirconium dioxide, 0.2-0.5% of iridium dioxide, 0.15-0.45% of SO4<2-> and the balance of ZSM-5 molecular sieve. The method in an industrial process of producing propylene from an n-butene-containing mixed C4 raw material has the advantages of low reaction temperature and high single-pass yield of propylene.

Description

technical field [0001] The invention relates to a method for preparing propylene from n-butene. Background technique [0002] In 2011, the total output of propylene in my country was 14.68 million tons. In 2011, the apparent consumption of propylene in my country was 16.43 million tons, and the self-sufficiency rate was only 89.3%. It is estimated that the apparent consumption of propylene in my country will reach 22 million tons in 2015. [0003] With the lightening of ethylene cracking raw materials and the impact of ethane cracking routes and methanol-to-olefins projects, in recent years, the output of ethylene cracking by-product propylene, which is the main source of propylene, will decrease year by year. On the other hand, the rapid development of the methanol-to-olefins project, and its by-product C4 has provided more n-butene resources for the market. Therefore, using cheap and abundant n-butene as raw material, converting n-butene into propylene through catalytic ...

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 Patents(China)
IPC IPC(8): C07C4/06C07C11/06B01J29/44
CPCY02P20/52
Inventor 周峰马会霞乔凯
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