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Cracking assistant for improving low-carbon olefin concentration

A technology of low-carbon olefins and additives, which is applied in the field of cracking additives to increase the concentration of propylene in catalytic cracking liquefied gas, and can solve the problems of high yield of propylene dry gas and coke, low propylene selectivity, and limited range of propylene concentration. , to achieve the effect of reducing dry gas and coke yield, increasing yield and increasing octane number

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic promoters disclosed in the prior art are used for catalytic cracking, and the range of increasing the concentration of propylene in liquefied gas is limited, and the selectivity of propylene is not high. Existing molecular sieves with MFI structure modified by phosphorus and transition metals are used for catalytic cracking production High yield of propylene dry gas and coke

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 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 H 3 PO 4 (concentration 85% by weight) and 0.81kgFe(NO 3 ) 3 9H 2 O was dissolved in 9kg of water, and the impregnating solution 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; 0.34kg of H 3 PO 4(concentration 85% by weight) is dissolved in 9kg water, this dipping liquid is mixed with the sample after above-mentioned dipping for the first time dipping, oven dry, 550 ℃ of roasting treatment 2 hours, obtain the phosphorus and transition metal modified MFI of the present invention Molecular sieve, denoted as A 1 . Elemental analysis chemical composition (mass) is 0.08Na 2 O·3.0Al 2 o 3...

Embodiment 2

[0043] 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 impregnation solution, which was mixed with the filter cake for impregnation, dried, and roasted at 550°C for 2 hours to obtain a sample; 0.32kg H 3 PO 4 (concentration 85% by weight) was dissolved in 9kg water to obtain impregnating liquid, this impregnating liquid and above-mentioned sample were mixed impregnated, oven-dried, 550 ℃ of roasting 2 hours, obtain the phosphorus and transition metal modified MFI molecular sieve of the present invention, write down for A 2 . Elemental analysis chemical composition is 0.11Na 2 O·2.8Al 2 o 3 5.5P 2 o 5 8.6Co ...

Embodiment 3

[0047] 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; 0.15kg H 3 PO 4 (concentration 85% by weight) and 0.38kgNi(NO 3 ) 2 ·6H 2 O was dissolved in 9kg of water, and the impregnating solution was mixed with the filter cake for impregnation, dried, and roasted at 550°C for 2 hours to obtain the first impregnated sample; 0.1kg of H 3 PO 4 (concentration 85% by weight) was dissolved in 9 kg of water, the impregnating solution was mixed with the above-mentioned impregnated sample for the first time, impregnated, dried, and roasted at 550 ° C for 2 hours to obtain the phosphorus and transition metal modified MFI molecular sieve of the present invention , denoted as A 3 . Elemental analysis chemical composition is 0.1Na 2 O·3.2Al 2 o 3 1.5...

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Abstract

The invention discloses a cracking assistant for improving a low-carbon olefin concentration. The cracking assistant comprises 10 to 75wt% of a phosphor and transition metal-modified MFI molecular sieve, 0 to 60wt% of clay, and 15 to 60wt% of an inorganic oxide binder. There is not an absorption peak at the wavelength of 1633cm<-1> in a phosphor and transition metal-modified MFI molecular sieve infrared spectra obtained by trimethylpyridine as a probe molecule. One or more transition metals adopted by the phosphor and transition metal-modified MFI molecular sieve are selected from Fe, Co, Ni, Cu, Mn, Zn, Sn and Bi. The cracking assistant is used for petroleum hydrocarbon catalytic cracking, can improve a catalytic cracking liquefied gas yield, can improve a catalytic gasoline octane value and can obviously improve a propylene concentration of liquefied gas.

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, and the world's demand for propylene is increasing year by year. Fluid catalytic cracking is one of the important processes for the production of low-carbon olefins. For most catalytic cracking units, the use of modified zeolite catalysts or additives containing phosphorus and transition metals with MFI structure is an effective technical way to increase the production of propylene . [0003] CN 1465527A discloses a zeolite with MFI structure containing phosphorus and transition metals. The anhydrous chemical expression of the zeolite is (0-0.3) Na 2 O·(0.5~5)Al 2 o 3 ·(1.3~10)P 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01J29/48B01J29/40C10G11/05
Inventor 陈蓓艳蒋文斌欧阳颖沈宁元朱玉霞罗一斌宋海涛田辉平黄志青
Owner CHINA PETROLEUM & CHEM CORP
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