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Cracking assistant for improving low-carbon olefin concentration

A catalytic cracking additive and concentration technology, applied in the direction of cracking, catalytic cracking, molecular sieve catalysts, etc., can solve the problems of low propylene concentration and weakened heavy oil conversion capacity, achieve high selectivity, improve heavy oil conversion capacity, and improve gasoline octane The effect of alkanes

Active Publication Date: 2013-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] At present, for the vast majority of catalytic cracking units, under the premise of the same liquefied gas yield, increasing the propylene concentration in the liquefied gas is an important way to improve the economic benefits of the catalytic cracking unit, but the existing catalytic promoters are used to catalyze In the cracking process, the concentration of propylene in the liquefied gas is not high; when the additive is added in a large amount, it will weaken the conversion ability of heavy oil

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

[0039] In the preparation method of the catalytic cracking aid provided by the present invention, the phosphorus-aluminum inorganic binder containing the first clay, based on its dry weight, contains Al 2 o 3 15-40% by weight of aluminum components, with P 2 o 5 45-80% by weight of the phosphorus component and 1-40% by weight of the first clay on a dry basis, the P / Al weight ratio is 1.0-6.0, the pH is 1.0-3.5, and the solid content is 15-60% by weight , does not contain chlorine. The preparation method of the described first clay-containing phosphorus-aluminum inorganic binder comprises:

[0040] (1) beating and dispersing the alumina source, the first clay and water into a slurry with a solid content of 8 to 45% by weight; the alumina source is aluminum hydroxide and / or alumina that can be peptized by acid, and The dry basis of the first clay and Al 2 o 3 The weight ratio of the alumina source calculated is 1~40: 15~40;

[0041](2) under stirring, add concentrated pho...

Embodiment 1

[0068] 5kg NH 4 Cl was dissolved in 100kg of water, and 10kg (dry basis) of crystallization product ZSM-5 molecular sieve (produced by Sinopec Catalyst Qilu Branch Company, produced by amine method, SiO 2 / Al 2 o 3 =50), after exchanging at 90°C for 0.5h, filtered to obtain a filter cake; 0.56kg concentrated H 3 PO 4 (concentration 85% by weight) and 0.81kgFe(NO 3 ) 3 9H 2 O was dissolved in 9 kg of water, and the impregnating liquid was mixed with the filter cake for impregnation, dried, and roasted at 550 ° C for 2 hours to obtain the sample after the first impregnation; 0.34 kg H 3 PO 4 (concentration 85% by weight) was dissolved in 9 kg of water, the impregnating solution was mixed with the sample after the above first impregnation, impregnated, dried, and roasted at 550 ° C for 2 hours to obtain the modified MFI molecular sieve of the present invention, denoted as A 1 . Elemental analysis chemical composition (mass) is 0.08Na 2 O·3.0Al 2 o 3 5.4P 2 o 5 1.5Fe...

Embodiment 2

[0073] 5kg NH 4 Cl is dissolved in 100kg of water, and 10kg (dry basis) of the crystallization product ZSM-5 molecular sieve (produced by Sinopec Catalyst Qilu Branch of Sinopec, synthesized by amine method, SiO 2 / Al 2 o 3 =50), after exchanging at 90°C for 0.5h, filtered to obtain a filter cake; 0.61kg H 3 PO 4 (concentration 85% by weight) and 3kg Co(NO 3 ) 2 ·6H 2 O was dissolved in 9kg of water to obtain an impregnating solution, which was mixed with the filter cake for impregnation, dried, and roasted at 550°C for 2 hours to obtain a sample; 0.32kgH 3 PO 4 (concentration 85% by weight) was dissolved in 9 kg of water to obtain an impregnating liquid, which was mixed with the above-mentioned sample for impregnation, drying, and roasting at 550° C. for 2 hours to obtain the modified MFI molecular sieve of the present invention, denoted as A 2 . Elemental analysis chemical composition is 0.11Na 2 O·2.8Al 2 o 3 5.5P 2 o 5 8.6Co 2 o 3 ·83SiO2 2 , the phosphoru...

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Abstract

The invention discloses a cracking assistant for improving a low-carbon olefin concentration. The cracking assistant comprises a modified MFI molecular sieve, a first clay-containing phosphor-aluminum inorganic binder, other inorganic binders and a VIII metal additive, and / or second clay. The first clay-containing phosphor-aluminum inorganic binder comprises an aluminum component, a phosphor component and first clay. The modified MFI molecular sieve contains phosphor and one or more of transition metals of Fe, Co, Ni, Cu, Mn, Zn, Sn and Bi. There is not an absorption peak at the wavelength of 1633cm<-1> in a modified MFI molecular sieve infrared spectra obtained by trimethylpyridine as a probe molecule. The cracking assistant is used for catalytic cracking, can improve a catalytic cracking liquefied gas yield, can obviously improve a concentration of a low-carbon olefin in catalytic cracking liquefied gas, can especially improve a concentration of propylene in catalytic cracking liquefied gas, and can improve the selectivity of dry gas and coke.

Description

technical field [0001] The invention relates to a cracking auxiliary agent for increasing the concentration of low-carbon olefins in catalytic cracking liquefied gas, and more particularly relates to a cracking auxiliary agent for increasing the concentration of propylene in catalytic cracking liquefied gas. Background technique [0002] Propylene is an important organic chemical raw material. With the increasing demand for propylene derivatives such as polypropylene, the demand for propylene is increasing year by year all over the world. Fluid catalytic cracking is an important method for the production of propylene and other low-carbon olefins. In order to increase the yield of propylene, it is an effective technical approach to use catalysts or additives containing zeolite with MFI structure in the catalytic cracking process. [0003] USP3,758,403 disclosed earlier that the method of adding ZSM-5 zeolite in the catalytic cracking catalyst can improve the octane number of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J29/48B01J29/40C10G11/05
Inventor 陈蓓艳沈宁元朱玉霞罗一斌欧阳颖田辉平蒋文斌黄志青宋海涛
Owner CHINA PETROLEUM & CHEM CORP
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