Preparation method for hydrocracking catalyst

A hydrocracking and catalyst technology, applied in physical/chemical process catalysts, catalyst carriers, molecular sieve catalysts, etc., can solve problems such as poor thermal and hydrothermal stability, low activity, and low yield of medium oil

Active Publication Date: 2015-08-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1382632A discloses a super-stabilizing method of small-grain Y-type zeolite, which is obtained by contacting the dry gas of silicon tetrachloride with small-grain NaY zeolite and washing it. The stability is poor, and the method is to deal with molecular sieves by gas-phase dealumination and silicon supplementation, which makes the thermal and hydrothermal stability of the product worse and the activity low
In this method, the raw material needs to be treated with ammonium hexafluorosilicate for dealumination of silicon first, and then undergo hydrothermal treatment and other treatments, so as to reduce the collapse of the molecular sieve skeleton structure and improve the crystallization retention of the molecular sieve. After treatment with ammonium hexafluorosilicate for dealumination and silicon supplementation, due to the isomorphic substitution of silicon and aluminum, the molecu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment is to prepare raw material small grain NaY type molecular sieve

[0052] Preparation of NY-1

[0053] (1) Preparation of directing agent: Dissolve 8 g of sodium hydroxide solid in 80 g of water, add 2.5 g of sodium metaaluminate (Al 2 o 3 Content is 45wt%, Na 2 O content is 41wt%), then add 40g water glass (SiO 2 Content is 28wt%, Na 2 The O content is 8 wt%), mixed evenly and aged at 18°C ​​for 4 hours to prepare the directing agent.

[0054] (2) Preparation of amorphous silicon-aluminum precursor

[0055] Prepare solid sodium aluminate to a concentration of 0.3L for 100g A1 2 o 3 / L sodium aluminate working solution (a). Dilute the concentrated ammonia water with an appropriate amount of distilled water to obtain about 10wt% dilute ammonia water (b). SiO 2 28wt% sodium silicate solution, then diluted to 0.5L concentration is 140g SiO 2 / L sodium silicate working solution (c). Take a 5-liter steel reaction tank, add 0.5 liter of distilled w...

Embodiment 2

[0069] Firstly, ammonium exchange is carried out on the raw material small grain NaY molecular sieve NY-1. Formulated with NH 4 + and H + Concentrations of 1.0mol / L and 0.02mol / L solution (ammonium chloride and hydrochloric acid mixed solution) 10 liters. Weigh 1,000 grams of small-grain NaY molecular sieves, add them to the above mixed solution, stir at 300 rpm, and stir at a constant temperature of 90°C for 1 hour, then filter the molecular sieves, and leave a small sample for analysis of NaY 2 O content; repeat the above operation until Na in the molecular sieve 2 The content of O reached 1.5wt%, and the sample number after drying was NNY-1.

Embodiment 3

[0071] Firstly, ammonium exchange is carried out on the raw material small grain NaY molecular sieve NY-2. Formulated with NH 4 + and H + 10 liters of solutions (mixed solution of ammonium nitrate and nitric acid) with concentrations of 0.8.0mol / L and 0.01mol / L respectively. Weigh 1,000 grams of small-grain NaY molecular sieves, add them to the above mixed solution, stir at 300 rpm, and stir at a constant temperature of 95°C for 1 hour, then filter the molecular sieves, and leave a small sample for analysis of NaY 2 O content; repeat the above operation until Na in the molecular sieve 2 The O content reached 1.5wt%, and the sample number after drying was NNY-2.

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Abstract

The invention discloses a preparation method for a hydrocracking catalyst. The method comprises the following steps: subjecting a small-grain Y type molecular sieve, amorphous silicon-aluminum and a binder prepared from alumina to mechanical mixing and molding and then carrying out drying and roasting so as to prepare a catalyst carrier; and loading a hydrogenation active metal component on the catalyst carrier and then carrying out drying and roasting so as to prepare the catalyst. According to the method, a NaY type molecular sieve raw material with a high silica-alumina ratio, a high degree of crystallization and good stability is employed and successively undergoes ammonium exchange, primary hydro-thermal treatment, treatment with an alkali-containing solution, secondary hydro-thermal treatment and treatment with a mixed solution of acid and an ammonium salt; and the obtained small-grain Y type molecular sieve has a high SiO2/Al2O3 mol ratio and a high proportion of secondary pores, retains the stability of the molecular sieve and has a high specific surface area and a high degree of crystallization. The hydrocracking catalyst provided by the invention is applicable as a hydrocracking catalyst for high and medium oil and has good activity, medium oil selectivity and product properties.

Description

[0001] technical field [0002] The invention relates to a method for preparing a hydrocracking catalyst, more specifically, a method for preparing a hydrocracking catalyst containing small grain Y-type molecular sieves. Background technique [0003] With the increasing demand for middle distillates in the international oil market, more middle distillates need to be obtained from heavy oil, and the hydrocracking process is one of the important means of lightening heavy oil. Because the process has the characteristics of strong raw material adaptability, good product quality, flexible adjustment operation, high yield of middle distillate products, and flexible product structure, the status of hydrocracking process has become more and more important, especially for the current problems faced by our country. Due to the shortage of petroleum resources, increasingly stringent environmental protection requirements, and the structure of petroleum products that are no longer suitable...

Claims

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Application Information

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IPC IPC(8): B01J29/08B01J32/00C10G47/16
Inventor 孙晓艳樊宏飞王占宇
Owner CHINA PETROLEUM & CHEM CORP
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