Method of preparing propylene by catalytic cracking of n-butene

A catalytic cracking and n-butene technology, which is applied in chemical instruments and methods, catalysts, hydrocarbon cracking and hydrocarbon production, etc., can solve the problems of propylene yield to be further improved, and the target product propylene single-pass yield is low, so as to improve the holding capacity amount, high propylene per pass yield, and 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 modif

Method used

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  • Method of preparing propylene by catalytic cracking of n-butene
  • Method of preparing propylene by catalytic cracking of n-butene
  • Method of preparing propylene by catalytic cracking of n-butene

Examples

Experimental program
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Example Embodiment

[0032] Example 1

[0033] The specific preparation process of the modified ZSM-5 molecular sieve F1 is as follows: (1) Dissolve 8.5 g of zirconyl nitrate and 0.8 g of chloroiridic acid in 22 ml of deionized water, and add the resulting brine solution 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 to the suspension A1 with a molar ratio of 76 and a pore volume of 0.19 cm 3 / g hydrogen type ZSM-5 molecular sieve, stirred at room temperature (25°C) for 2 hours to obtain slurry B1. (2) Transfer the slurry B1 to the rotary evaporator, evaporate the n-hexane solvent to obtain dry glue C1, dry it at room temperature (25℃) for 24 hours, dry at 120℃ for 12 hours, and then roast at 650℃5 Within hours, ZSM-5 molecular sieve D1 containing zirconium and iridium was obtained. (3) Move D1 into 500 ml of 0.1 mol / L ammonium sulfate solution, soak for 5 hours, after the required soaking time is reached, filter out the ammonium sulfa...

Example Embodiment

[0036] Example 2

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

Example Embodiment

[0038] Example 3

[0039] The specific preparation process of the modified ZSM-5 molecular sieve F3 is as follows: (1) Dissolve 11.2 g of zirconyl nitrate and 1.1 g of chloroiridic acid in 23.7 ml of deionized water, and add the resulting brine solution to 950 ml of cyclohexane solvent , Continuous stirring for 1 hour to form a suspension A3. Add 114.5 g of Si / Al to the suspension A3 with a molar ratio of 93 and a pore volume of 0.21 cm 3 / g hydrogen type ZSM-5 molecular sieve, stirred at room temperature (25°C) for 2 hours to obtain slurry B3. (2) Transfer slurry B3 to a rotary evaporator, evaporate the cyclohexane solvent to obtain dry glue C3, dry it at room temperature (25°C) for 24 hours, dry at 120°C for 12 hours, and then roast at 630°C After 10 hours, ZSM-5 molecular sieve D3 containing zirconium and iridium was obtained. (3) Move 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 ...

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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

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Application Information

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IPC IPC(8): C07C4/06C07C11/06B01J29/44
CPCY02P20/52C07C4/06B01J29/44B01J2229/26B01J2229/37C07C2529/44C07C2529/65C07C11/06
Inventor 周峰马会霞乔凯
Owner CHINA PETROLEUM & CHEM CORP
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