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Modified Y-type molecular sieve and preparation method thereof

A molecular sieve and modification technology, used in molecular sieve catalysts, chemical instruments and methods, petroleum industry, etc., can solve the problems of low catalyst cracking activity, poor thermal and hydrothermal stability, reduced zeolite selectivity, etc., and achieve high LCO conversion. Effects of efficiency, high hydrothermal stability, low coke selectivity

Active Publication Date: 2020-02-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth-containing high-silicon Y-type zeolite can be prepared by performing multiple rare-earth ion exchanges and multiple high-temperature roasting on NaY zeolite. The disadvantages of zeolite are: because too harsh hydrothermal treatment conditions will destroy the structure of zeolite, Y-type zeolite with high silicon-alumina ratio cannot be obtained; although the production of aluminum outside the framework is very important for improving the stability of zeolite and forming new acid centers Beneficial, but too much aluminum outside the framework reduces the selectivity of zeolite; in addition, many dealuminated holes in zeolite cannot be filled by silicon migrated from the framework in time, often resulting in lattice defects of zeolite, and the crystallization of zeolite remains Therefore, the thermal and hydrothermal stability of the rare earth-containing high-silicon Y-type zeolite prepared by the hydrothermal method is relatively poor, which is manifested in the low lattice collapse temperature, the crystallinity retention rate and the ratio of crystallinity after hydrothermal aging. low surface area retention
The cracking activity of the catalyst made of the zeolite as the active component is not high, and the conversion rate of heavy oil is low
[0019] However, the existing ultra-stable Y-type molecular sieves containing phosphorus and rare earths have low heavy oil cracking activity and poor coke selectivity.

Method used

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  • Modified Y-type molecular sieve and preparation method thereof
  • Modified Y-type molecular sieve and preparation method thereof
  • Modified Y-type molecular sieve and preparation method thereof

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preparation example Construction

[0075] The preparation method of the present disclosure can prepare a high-silicon Y-type molecular sieve containing phosphorus, rare earth and gallium with a certain secondary pore structure with high crystallinity, high thermal stability and high hydrothermal stability. The aluminum in the molecular sieve is evenly distributed and has no skeleton With less aluminum content, the modified Y-type molecular sieve is used for processing hydrogenated LCO and has high LCO conversion efficiency, low coke selectivity, and higher aromatics-rich gasoline yield.

[0076] In the preparation method of the modified Y-type molecular sieve provided by the present disclosure, in step (1), the NaY molecular sieve and the rare earth solution are subjected to an ion exchange reaction to obtain a Y-type molecular sieve with a conventional unit cell size containing rare earths with reduced sodium oxide content, and ion exchange The method of reaction can be known to those skilled in the art, for ex...

Embodiment approach

[0084] In one embodiment, the phosphorus modification treatment conditions are as follows: adding the Y-type molecular sieve powder sample with reduced unit cell constant to the exchange solution containing phosphorus compounds, and performing exchange reaction at 15-100°C for 10-100 minutes , filter, wash; Wherein, the weight ratio of the water in the exchange liquid and the molecular sieve is (2~5): 1, preferably (3~4): 1, phosphorus (in P 2 o 5 weight) to molecular sieve is (0.0005-0.10):1, preferably (0.001-0.05):1.

[0085] Further, in order to ensure the effect of gas phase ultrastable modification, the molecular sieve can be dried before step (3), to reduce the water content in the molecular sieve, so that the 4 The moisture content of the contacted molecular sieves does not exceed 1% by weight. For example, in the embodiment where the phosphorus modification treatment is carried out before the gas phase ultrastable modification step, the phosphorus-containing moderat...

specific Embodiment approach

[0105] In a third specific embodiment of the present disclosure, the method for preparing a modified Y-type molecular sieve comprises the following steps:

[0106] (1) Perform ion exchange reaction between NaY molecular sieve (also known as NaY zeolite) and rare earth solution, filter and wash to obtain ion-exchanged molecular sieve, the molecular sieve after ion exchange has reduced sodium oxide content, contains rare earth elements and has a conventional unit cell Size; the ion exchange is usually exchanged for 30 to 120 minutes under the conditions of stirring and a temperature of 15 to 95 ° C, preferably 65 to 95 ° C;

[0107] (2) The Y-type molecular sieve with the rare earth-containing conventional unit cell size with reduced sodium oxide content is roasted for 4.5-7 hours at a temperature of 350-480°C in an atmosphere containing 30-90% by volume of water vapor, and dried to obtain a water content A mildly hydrothermally ultrastable modified molecular sieve as low as 1% ...

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Abstract

The invention relates to a modified Y-type molecular sieve and a preparation method thereof. The modified Y-type molecular sieve comprises (calculated as the weight of the dry base) 4-11 wt% of rare earth elements (calculated as oxide), 0.05-10 wt% of phosphorus (calculated as P2O5), 0.1-0.7 wt% of sodium oxide, and 0.1-5 wt% of an active element oxide, the active element is gallium and / or boron,the total pore volume of the modified Y-type molecular sieve is 0.33-0.39 mL / g, the pore volume of the secondary pores with a pore size of 2-100 nm accounts for 15-30% of the total pore volume, the cell constant is 2.440-2.455 nm, the lattice collapse temperature is not lower than 1050 DEG C, the non-skeleton aluminum of the modified Y-type molecular sieve accounts for not more than 20% of the total aluminum content, and a ratio of the amount of the acid B to the amount of the acid L in the amount of the strong acid is not less than 3.5. According to the invention, the modified Y-type molecular sieve has characteristics of high crystallinity, high thermal stability and hydrothermal stability and secondary pore structure; and with the application of the modified Y-type molecular sieve in processing hydrogenation of LCO, the LCO conversion efficiency is high, the coke selectivity is low, and the yield of gasoline rich in aromatic hydrocarbon is high.

Description

technical field [0001] The disclosure relates to a modified Y-type molecular sieve and a preparation method thereof. Background technique [0002] Light aromatics such as benzene, toluene and xylene (BTX) are important basic organic chemical raw materials, widely used in the production of polyester, chemical fiber, etc., and demand has been strong in recent years. Light aromatics such as benzene, toluene and xylene (BTX) mainly come from catalytic reforming and steam cracking processes using naphtha as raw material. Due to the shortage of naphtha raw materials, there is a large market gap for light aromatics. [0003] Catalytic cracking light cycle oil (LCO) is an important by-product of catalytic cracking, which is rich in aromatic hydrocarbons, especially polycyclic aromatic hydrocarbons, and belongs to the low-quality diesel fraction. With the development and change of market demand and environmental protection requirements, LCO is greatly restricted as a diesel blendin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08C10G11/05
CPCB01J29/088C10G11/05B01J2029/062
Inventor 周灵萍袁帅许明德沙昊姜秋桥张蔚琳陈振宇田辉平
Owner CHINA PETROLEUM & CHEM CORP
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