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Method for producing ethylene and propylene by catalytic cracking

A catalytic cracking and ethylene technology, applied in chemical instruments and methods, bulk chemical production, molecular sieve catalysts, etc., can solve problems such as less research on olefin optimization and utilization, easy deactivation of catalysts, poor thermal stability of catalysts, etc. efficiency and selectivity, reduction of side reactions, and good catalytic activity

Active Publication Date: 2010-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN1704389A discloses a new method for the production of propylene from olefin cracking, the method is to use the ZSM-5 molecular sieve containing rare earth metals or their oxides as catalyst active components, and use it for C 4 ~C 8 In the production of propylene by olefin cracking, the problems of poor thermal stability and easy deactivation of the catalyst are better solved
[0008] Numerous patents focused on the catalytic C 4 ~C 6 Catalyst and method thereof for olefin cracking to generate propylene, for C 6 ~C 12 There are few studies on the optimal utilization of olefins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) The ZSM-23 molecular sieve raw powder with a particle size of 10-100nm was roasted at 550°C to remove the template agent, and then mixed with 1mol / L NH 4 NO 3 The solution was ion-exchanged twice at 100° C. for 4 hours each time, dried after the exchange, and calcined at 550° C. for 4 hours to obtain hydrogen-type molecular sieves.

[0044] 2) the hydrogen ZSM-23 molecular sieve in a specific concentration of (NH) 2 HPO 4 Immersed in the solution, then dried, and roasted at 500° C. for 3 hours to obtain a P-modified molecular sieve; based on the total weight of the molecular sieve, the content of P is 2.0% by weight;

[0045] 3) Mix the phosphorus-modified molecular sieve obtained in step 2, silica sol and appropriate amount of water according to the weight ratio of molecular sieve dry basis: silica sol = 25:75, grind it evenly, extrude it, dry and roast to obtain catalyst A1 .

Embodiment 2

[0047] 1) The ZSM-5 molecular sieve raw powder with a particle size of 10-100nm was roasted at 600°C to remove the template agent, and then mixed with 1.5mol / L NH 4 NO 3 The solution was ion-exchanged twice at 100° C. for 4 hours each time, dried after the exchange, and calcined at 600° C. for 4 hours to obtain hydrogen-type molecular sieves.

[0048] 2) The hydrogen ZSM-5 molecular sieve was mixed with a specific concentration of AgNO 3 Immersed in the solution, then dried, and roasted at 550° C. for 2 hours to obtain an Ag-modified molecular sieve; based on the total weight of the molecular sieve, the content of Ag is 2.2% by weight;

[0049] 3) Mix the silver-modified molecular sieve obtained in step 2, pseudo-boehmite and water in a weight ratio of molecular sieve:pseudo-boehmite=40:60 on a dry basis, grind it evenly, extrude it, dry and roast Catalyst A2 is obtained.

Embodiment 3

[0051] 1) The ZSM-5 molecular sieve raw powder with a particle size of 10-100nm was roasted at 550°C to remove the template agent, and then mixed with 2mol / L NH 4 NO 3 The solution was ion-exchanged twice at 100° C. for 4 hours each time, dried after the exchange, and calcined at 650° C. for 4 hours to obtain hydrogen-type molecular sieves.

[0052] 2) The hydrogen-type ZSM-5 molecular sieves are sequentially added at a specific concentration (NH) 2 HPO 4 solution, Cu(NO 3 ) 2 Immersed in the solution, dried, and then roasted at 450°C for 4 hours to obtain a (Cu+P) modified molecular sieve; based on the total weight of the molecular sieve, the contents of Cu and P are 5.0% by weight and 2.4% by weight, respectively;

[0053] 3) Mix the double-element modified molecular sieve obtained in step 2, kaolin and appropriate amount of water according to the weight ratio of molecular sieve: kaolin = 30:70 on a dry basis, grind it evenly, extrude it, dry and roast it to obtain catal...

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Abstract

The invention provides a method for producing ethylene and propylene by catalytic cracking. The method comprises the steps: introducing an alkene raw material into a fixed bed reactor to contact the alkene raw material with a catalyst to perform a catalytic cracking reaction under the conditions of a temperature of between 500 and 680 DEG C, a pressure of between 0 and 0.5MPa, a weight space velocity of between 10 and 50h<-1> and a water-oil weight ratio of between 0 and 1.0; and separating resulting the hydrocarbon mixture obtained after the reaction to obtain the ethylene and the propylene, wherein based on the total weight of the catalyst, the catalyst contains 20 to 40 percent by weight of modified molecular sieve and 60 to 80 percent by weight of heat resisting inorganic oxide, the average grain size of the modified molecular sieve is between 10 and 100nm and the modified element is one of phosphorus and metals in the IB group or the modified elements are a mixture of elements selected from phosphorus and metals in the IB group; and based on the total weight of the molecular sieve, the content of the modified element is between 1 to 10 percent. The method provided by the invention has higher alkene conversion rate and once-through yield of the ethylene and the propylene.

Description

technical field [0001] The present invention relates to a kind of method of olefin catalytic cracking to produce ethylene and propylene, more specifically, is to combine C 6 ~C 12 Process for the catalytic cracking of olefins to produce ethylene and propylene. Background technique [0002] With the continuous development of the ethylene industry and the oil refining industry, the deep processing of oil refining makes petrochemical enterprises produce a large amount of C by-products. 4 ~C 12 Fraction, which is rich in a large number of olefins. At present, these by-product olefins are mainly used as raw materials for downstream production processes through hydrotreating (such as hydrogenation of coker naphtha as raw materials for steam cracking), but this leads to increased production energy consumption. Therefore, the by-product C 4 ~C 12 The effective utilization and conversion of olefins into low-carbon olefins with high added value can not only meet the growing mark...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06B01J29/40
CPCY02P20/52
Inventor 侯焕娣李锐崔德春张书红王子军李萍
Owner CHINA PETROLEUM & CHEM CORP
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