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Method for preparing propylene from n-butene

A technology for n-butene and propylene, which is applied in chemical instruments and methods, hydrocarbon cracking to produce hydrocarbons, molecular sieve catalysts, etc., can solve the problems that the yield of propylene needs to be further improved, the single-pass yield of the target product propylene is low, etc. high yield of propylene per pass, and the effect of enhanced stability

Active Publication Date: 2017-05-17
CHINA PETROLEUM & CHEM CORP +1
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  • 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

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  • Method for preparing propylene from n-butene
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  • Method for preparing propylene from n-butene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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

[0039] 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

[0041] 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...

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Abstract

The invention discloses a method for preparing propylene from n-butene. A raw material containing the n-butene is in contact with a cracking catalyst under a catalytic cracking reaction condition, wherein the reaction temperature is 450-550 DEG C, preferably 450-500 DEG C, the reaction total pressure (absolute pressure) is 0-0.5MPa, preferably 0-0.15MPa, the weight space velocity is 1-10h<-1>, preferably 2-4h<-1>; according to the cracking catalyst, the content of FER molecular sieve and modified ZSM-5 molecular sieve is no less than 50%, and the mass ratio of the FER molecular sieve to the modified ZSM-5 molecular sieve is (1 to 1) to (3 to 1); the modified ZSM-5 molecular sieve comprises the following components in percentage by weight: 4.5-6.0% of zirconium dioxide, 0.2-0.5% of iridium oxide, 0.15-0.45% of SO4<2->, and the remaining of ZSM-5 molecular sieve, and molar ratio of silicon to aluminum of the FER molecular sieve is 50-100. The method has the advantages of low reaction temperature and high single-pass propylene yield for use in the industrial process of producing the propylene from the raw material containing n-butene mixed C4.

Description

technical field [0001] The invention relates to a method for preparing propylene by using n-butene as raw material. 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 propylen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C4/06B01J29/80
CPCY02P20/52
Inventor 周峰马会霞乔凯
Owner CHINA PETROLEUM & CHEM CORP
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