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Cracking catalyst as well as preparation method and application thereof

A technology for cracking catalysts and fluorides, which is applied in the direction of catalysts, hydrocarbon cracking to hydrocarbons, molecular sieve catalysts, etc., and can solve the problems of low propylene yield and high reaction temperature

Pending Publication Date: 2022-03-18
新疆理工学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In summary, the latest naphtha catalytic cracking catalysts at home and abroad all use molecular sieve catalysts, single molecular sieves or combined molecular sieves, micro-mesoporous molecular sieves and surface-modified molecular sieve catalysts, and the problems of high reaction temperature and low propylene yield have not been solved. , it can be seen that to achieve lower energy consumption and greater yield of propylene in naphtha catalytic cracking, a new catalyst for naphtha catalytic cracking to produce propylene is needed

Method used

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  • Cracking catalyst as well as preparation method and application thereof
  • Cracking catalyst as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0022] The invention provides a method for preparing a cracking catalyst, the method comprising: (1) mixing a molecular sieve with a metal solution to perform a first contact, performing a first drying to the solid after the first contact, and first roasting to obtain a modified molecular sieve; 2) Mix the modified molecular sieve, the carrier, and the binder uniformly, form them, perform hydrothermal aging treatment under a reducing atmosphere after the second drying and the second calcination; the metal solution contains iron salts, magnesium salts, zinc salts, and copper Salt, optionally fluoride, optionally phosphide, solvent. Using the method of the present invention, in addition to the metals commonly known to researchers in the aluminosilicate zeolite lattice structure, iron elements are also contained, and synergistic modification of multi-metals and non-metals is carried out at the same time, increasing the acid center of the molecular sieve and improving the molecular...

Embodiment approach

[0024] In the present invention, the type of molecular sieve can be selected in a wide range. According to a preferred embodiment of the present invention, the molecular sieve is selected from one of Y-type molecular sieves, β molecular sieves, titanium-silicon molecular sieves and ZSM-5 molecular sieves. or more; ZSM-5 molecular sieve is preferred; more preferably, the silicon-aluminum molar ratio of ZSM-5 molecular sieve is 100-300, and the particle size is 50-100 nm. Using the aforementioned preferred molecular sieves can further improve the selectivity of the catalyst at a relatively low temperature.

[0025] According to a preferred embodiment of the present invention, the optional range of the conditions of the first contact is relatively wide. For the present invention, preferably, the method includes: dynamic contact at a temperature of 40-90° C. for 1-24 hours. By adopting the aforementioned preferred technical scheme, the selectivity of the catalyst at a relatively l...

Embodiment 1

[0052] 11gFeCl 3 , 6gMgCl 2 , 6gZnCl 2 with 6gCuCl 2 Dissolve in 1000g of deionized water, stir for 10min and then add 46g of NH 4 F with 45g NH 4 h 2 PO 4 , was completely dissolved in the aqueous solution by stirring to obtain a mixed solution of metal fluoride and phosphorus; under magnetic stirring, slowly add 100g of HZSM-5 molecular sieve (mole ratio of silicon to aluminum is 200, particle size is 50nm), heated to 55°C, stirred and refluxed for 12h After filtering, drying at 110°C for 6 hours, and calcining at 550°C for 6 hours, the modified ZSM-5 molecular sieve was obtained.

[0053] Weigh 100g of the obtained powder and mix it with 20% kaolin on a dry weight basis of the catalyst and 20% aluminum sol on a dry weight basis of the catalyst. Roasting 8h. Then put it into the aging device, replace the oxygen content with hydrogen to less than 0.3%, raise the temperature to 800°C at a speed of 8°C / min, stay at a total pressure of 1.0MPa for 6h and then feed water v...

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Abstract

The invention provides a cracking catalyst and a preparation method and application thereof, the method comprises the following steps: (1) mixing a molecular sieve with a metal solution for first contact, and performing first drying and first roasting on the solid after the first contact to obtain a modified molecular sieve; (2) uniformly mixing the modified molecular sieve, a carrier and a binder, molding, carrying out secondary drying and secondary roasting, and then carrying out hydrothermal aging treatment in a reducing atmosphere; the metal solution contains ferric salt, magnesium salt, zinc salt and copper salt. The catalyst disclosed by the invention meets the requirement of catalytic cracking of naphtha to propylene on the acid strength of an active center of the molecular sieve, so that the selectivity of cracking naphtha to propylene reaches a relatively high degree at a relatively low temperature, and the propylene selectivity reaches 60%; the one-way selectivity of the catalyst is far higher than that of an existing catalyst for preparing propylene from naphtha, and the one-way selectivity is only 30%.

Description

technical field [0001] The present invention relates to cracking catalyst and its preparation method and application. Background technique [0002] Propylene is an important organic chemical raw material next to ethylene. Its main sources are catalytic cracking units and ethylene cracking units in refineries. Steam cracking is a traditional technology for the production of ethylene and propylene. Although the technology has been continuously improved after decades of development, but The reaction temperature (800-900°C) is relatively high. Steam cracking technology has the disadvantages of high ethylene production cost, CO production process 2 Due to technical limitations such as large emissions and difficult adjustment of product structure, and the P / E output mass ratio is only 0.4-0.6, it is difficult to meet the market demand for propylene only by steam cracking units. Compared with naphtha steam cracking technology, naphtha catalytic cracking technology has a higher to...

Claims

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Application Information

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IPC IPC(8): B01J29/46C07C4/06C07C11/06
CPCB01J29/46C07C4/06B01J2229/18C07C2529/18C07C11/06Y02P20/52
Inventor 苗鹏杰陈自娇李烨李守柱马梦瑶马信
Owner 新疆理工学院