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Method for producing propene using silicoaluminophosphate molecular sieve catalytic cracking

A technology for catalytic cracking and silicoaluminophosphate, applied in the fields of catalysis and chemical engineering, can solve problems such as low temperature, and achieve the effects of improved product selectivity, high cracking activity and simple process

Active Publication Date: 2006-04-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature of disproportionation to produce butene is low and the selectivity is high, but the raw material needs to be pretreated, and a large amount of ethylene is required to reduce by-products

Method used

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  • Method for producing propene using silicoaluminophosphate molecular sieve catalytic cracking

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The used SAPO-34 molecular sieve, the synthetic raw material is Al 2 o 3 :P 2 o 5 : SiO 2 :TEA=1:0.76:0.81:2.4, product Al 2 o 3 / SiO 2 The molar ratio is close to 1. Molecular sieves are calcined at 600°C for 4 hours, then bonded with silica sol, and the weight content of SAPO-34 is 90%. After crushing, take 60-120 meshes for use. Take by weighing the catalyzer that 20mg above-mentioned method obtains, be placed in the microreactor of quartz tube fixed bed and under N 2 After medium activation, the catalytic cracking dry gas with an ethylene weight content of 23% enters in a pulsed manner with a carrier gas with a flow rate of 10ml / min, and the equivalent weight space velocity is about 36h -1 (Based on ethylene), the reaction temperature is 350°C, the pressure is 0.3MPa, the tail gas is detected by gas chromatography, alumina packed column, and hydrogen flame detector. The conversion of ethylene is about 15%, and the selectivity of propylene is 36%. The produc...

Embodiment 2

[0026] The molar ratio of synthetic raw materials for SAPO-34 molecular sieve is Al 2 o 3 :P 2 o 5 : SiO 2 :LaO:TEA=1:1:0.16:0.015:2.4. Prepare the catalyst with 5% weight content of SAPO-34 as in Example 1. Take by weighing the catalyzer that 300mg above-mentioned method obtains, place in quartz tube fixed-bed micro-reactor and under N 2 After activation in the medium, with the raw material of embodiment 1 with the about 0.12h of reduced weight space velocity -1 (Based on ethylene) is fed continuously, the reaction temperature is 450°C, the pressure is 0.11MPa, the tail gas is detected by gas chromatography, alumina packed column, and hydrogen flame detector. The conversion of ethylene is about 79%, and the selectivity of propylene is 42%. The product distribution is shown in Table 1.

[0027] Conversion rates

Embodiment 3

[0029] SAPO-34 molecular sieve, its synthesis raw material molar ratio is Al 2 o 3 :P 2 o 5 : SiO 2 :TEA=1:1:0.6:2.4, catalyst particles were prepared according to Example 1, and the weight content of SAPO-34 was 90%. Take by weighing 20mg prepared catalyst, place in quartz tube fixed-bed microreactor, under the N of 15ml / min 2 The temperature was raised to 500°C for 1 hr and then lowered to 450°C. Switch the N2 flow to a mixture of C4 components, the flow rate is 40ml / min, and the equivalent weight space velocity is close to 300h -1 , the pressure is normal pressure, and the intercepted tail gas is analyzed with embodiment 1.

[0030] The raw material is a C4 mixture, 2-butene accounts for 96%, of which cis-butene is 54%, trans-butene is 42%, and the rest is butane.

[0031]

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Abstract

The present invention relates to propylene producing catalytically cracking process, and is especially propylene producing process with catalytically cracking aluminum silicophosphate. In fixed bed or fluidized bed reactor and at the conditions of temperature 350-550 deg.c, pressure 0.1-0.3 MPa and space velocity 0.1-300 / hr, dry gas, C4 component and other material are cracked in catalyst containing aluminum silicophosphate molecular sieve SAPO-34. The output hydrocarbon mixture is separated to obtain destination product propylene before the other components are returned to the reactor for circular use. The process of the present invention has low reaction temperature, pressure near normal pressure, simple technological process and high propylene selectivity. The present invention can utilizes dry gas and C4 component effectively.

Description

technical field [0001] The invention relates to a method for preparing low-carbon olefins, in particular to a method for preparing propylene by using silicoaluminophosphate molecular sieve as a catalyst, and belongs to the technical field of catalysis and chemical engineering. Background technique [0002] The demand for propylene in the world shows a strong growth trend. In 2002, the global propylene production was 57Mt. By 2010, the demand is expected to reach 88Mt. Since the current production of propylene is mainly obtained from cracking in tube furnaces, the demand for propylene is growing faster than that of ethylene, resulting in insufficient supply of propylene. Seeking to use catalytic cracking and catalytic cracking to produce more propylene is an important direction of petroleum processing at present. At present, the main method of catalytic cracking and catalytic cracking to increase the production of propylene is to use the shape-selective molecular sieve whose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06B01J29/85C07C4/06
CPCY02P20/52
Inventor 魏飞周华群王垚高雷汪展文王德峥
Owner TSINGHUA UNIV
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