Cracking assistant for improving low-carbon olefin concentration

A technology of low-carbon olefins and catalytic cracking aids, which is applied in the fields of hydrocarbon cracking to produce hydrocarbons, cracking, catalytic cracking, etc., can solve the problem of low concentration of low-carbon olefins, etc. The effect of reducing coke yield

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the concentration of low-carbon olef...

Method used

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  • Cracking assistant for improving low-carbon olefin concentration
  • Cracking assistant for improving low-carbon olefin concentration
  • Cracking assistant for improving low-carbon olefin concentration

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preparation example Construction

[0030] The preparation method of the phosphorus-containing and transition metal-containing molecular sieve provided by the present invention is characterized in that the raw powder of the β molecular sieve is placed in a temperature range from 200°C to 800°C through at least two non-overlapping temperature ranges from low to high After treatment to remove the templating agent, dealumination is followed by phosphorus and metal modification steps. Preferred steps include:

[0031] (1) The sodium-type β molecular sieve is exchanged with ammonium to make the Na on the molecular sieve 2 The O content is less than 0.2% by weight;

[0032] (2) After drying the molecular sieve obtained in step (1), treat it at a temperature range of 200-400°C for at least 0.5 hours, and then heat it up to a temperature range of 500-800°C within at most 2 hours and treat it for at least 0.5 hours to remove the template agent;

[0033] (3) Treating the product obtained in step (2) with a dealuminatio...

Embodiment 1

[0053] Beta zeolite (Naβ, produced by Qilu Catalyst Factory, SiO 2 / Al 2 o 3 =25, sodium oxide content 4.5% by weight, the same below) with NH 4 Cl solution exchange wash to Na 2 The O content is lower than 0.2% by weight, and the filter cake is obtained by filtration; dried, and the obtained sample is roasted at 350°C for 2 hours, and then heated to 550°C for 4 hours to remove the template agent; take 100g (dry basis) of the above-mentioned molecular sieve and add water Prepare a molecular sieve slurry with a solid content of 10% by weight, add 20g of oxalic acid during stirring, heat up to 80°C and stir for 1h, filter and wash until the filtrate is neutral; add water to the filter cake and beat to obtain a molecular sieve slurry with a solid content of 40% by weight, and mix 6.8gH 3 PO 4 (Concentration 85%) and 3.2gCu(NO 3 ) 2 ·3H 2 O was dissolved in 30 g of water, mixed with the molecular sieve slurry, impregnated and dried; the obtained sample was calcined at 550° ...

Embodiment 2

[0056] beta zeolite with NH 4 Cl solution exchange wash to Na 2 The O content is lower than 0.2% by weight, and the filter cake is obtained by filtration; dried, and the obtained sample is roasted at 150°C for 2 hours, then heated to 350°C for 2 hours for 30 minutes, and then heated to 500°C for 4 hours for 30 minutes. Template removal agent: Take 100g of the above-mentioned molecular sieve (dry basis) and add water to prepare a molecular sieve slurry with a solid content of 10% by weight, add 10g of fluosilicic acid during stirring, heat up to 60°C and stir for 1h, filter and wash until the filtrate is neutral; add water to the filter cake Beating to obtain a solid content of 40% by weight molecular sieve slurry, 11.8gH 3 PO 4 (concentration 85%) with 6.3gCuCl 2 Dissolved in 90g of water, mixed with filter cake, soaked and dried; the obtained sample was roasted at 550°C for 2 hours, namely the modified β molecular sieve provided by the present invention.

[0057] Elementa...

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Abstract

The invention discloses a cracking assistant for improving the low-carbon olefin concentration. The cracking assistant comprises 10 to 75wt% of a phosphorus and transition metal-containing beta molecular sieve, 0 to 60wt% of clay and 15 to 60wt% of an inorganic oxide binder; the phosphorus and transition metal-containing beta molecular sieve comprises 1-10wt% by P2O5 of phosphorus and 0.5-10 wt % by metallic oxide of a metal; and in the 27Al MAS NMR (Magic Angle Spinning Nuclear Magnetic Resonance) of the phosphorus and transition metal-containing beta molecular sieve, the ratio of resonance signal peak area at the chemical shift of 40+-3ppm to resonance signal peak area at the chemical shift of 54+-3ppm is greater than 1, and the percentage of the sun of the resonance signal peak area at the chemical shift of 0+-3ppm and the resonance signal peak area at the chemical shift of-12+-3ppm to the total peak area is less than 10%. The cracking assistant is used for catalytic cracking, and can improve ethylene concentration in a catalytic cracking dry gas, and improve propylene and isobutylene concentration in a liquefied gas.

Description

technical field [0001] The invention relates to a cracking aid for increasing the concentration of low-carbon olefins in catalytically cracked liquefied gas. More specifically, the invention relates to a cracking aid comprising phosphorus-containing and transition metal β molecular sieves. Background technique [0002] Low-carbon olefins Olefin is an important organic chemical raw material, and the world's demand for low-carbon olefins is increasing year by year. Fluid catalytic cracking is one of the important processes for producing low-carbon olefins. For most catalytic cracking units, adding additives is an effective technical way to increase the production of low-carbon olefins. However, the prior art has no obvious effect on increasing the concentration of isobutene in liquefied gas. From the perspective of isobutene formation and reaction chemistry in the FCC process, β molecular sieve (also known as β zeolite, beta molecular sieve) is an effective active component. ...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J29/78B01J29/70C10G11/05C07C4/06C07C11/02
Inventor 陈蓓艳邓景辉欧阳颖沈宁元朱玉霞罗一斌宋海涛王振波黄志青蒋文斌
Owner CHINA PETROLEUM & CHEM CORP
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