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A kind of beta molecular sieve and preparation method thereof

A technology of β molecular sieve and specific surface, which is applied in the field of β molecular sieve and its preparation, can solve the problems of low oil selectivity and low catalyst activity, etc., and achieve suitable acidity and acid distribution, large specific surface area, and good cracking effect Effect

Active Publication Date: 2015-11-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the silicon-aluminum ratio of the molecular sieve used in the catalyst is too high, the activity of the catalyst is low, and the selectivity of medium oil is not very high.

Method used

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Effect test

preparation example Construction

[0020] The preparation method of β molecular sieve of the present invention specifically comprises the following steps:

[0021] (1) The crystallized β molecular sieve slurry is directly subjected to ammonium exchange, filtration, washing and drying

[0022] The above-mentioned crystallized β molecular sieve is generally synthesized by using organic ammonium (such as tetraethylammonium hydroxide) as a template and using a hydrothermal crystallization method. Its chemical SiO 2 / Al 2 o 3 (Molar ratio) is generally 20 to 30, Na 2 The content of O is 3.0 to 4.0 wt%. The crystallized β molecular sieve slurry is directly exchanged with ammonium salt, the concentration of ammonium salt in the slurry is 0.5-5.0mol / L, ammonium exchange is carried out several times, so that the Na in the molecular sieve after exchange 2 The weight content of O is less than 0.3%, and the general ammonium exchange is 1 to 5 times, which can meet the requirements. The β molecular sieve after ammoniu...

Embodiment 1

[0033] The modified β molecular sieve of the present invention is synthesized by using tetraethylammonium hydroxide as a template and adopting a hydrothermal crystallization method. Take industrial synthetic β molecular sieve raw powder slurry 10000mL, which contains about 2000g of solid phase β molecular sieve, its chemical silicon aluminum SiO 2 / Al 2 o 3 (Molar ratio) The ratio is 27.49, and the specific surface area is 101m 2 / g, the pore volume is 0.19cm 3 / g, the sodium oxide content is 3.67wt%. Add an appropriate amount of clean water and a certain amount of ammonium nitrate to the slurry, so that the liquid-solid ratio (weight) is 10:1, the concentration of ammonium nitrate is 2mol / L, stir, heat up to 95-100°C, and stir at a constant temperature 2 hours, then filter, the filter cake is subjected to ammonium exchange for the second time, the exchange conditions are the same as the first time, and finally wash the β molecular sieve until the pH value is neutral, put ...

Embodiment 2

[0035] Take 200g of B-1 as a raw material, and carry out hydrothermal treatment on B-1 at a water vapor pressure of 0.15MPa, a treatment temperature of 550°C, and a treatment time of 2 hours. The obtained molecular sieve is B-2, and its properties are shown in Table 1.

[0036] Take 200g of B-1 as a raw material, and carry out hydrothermal treatment on B-1 at a water vapor pressure of 0.15MPa, a treatment temperature of 650°C, and a treatment time of 2 hours. The obtained molecular sieve is B-3, and its properties are shown in Table 1.

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Abstract

The invention discloses a beta molecular sieve and a preparation method thereof. According to the method, after a crystallized beta molecular sieve slurry directly undergoes ammonium exchange and a template agent removal treatment, first a hydrothermal treatment is conducted, and then an aluminum salt solution treatment is carried out, so that part of non-framework aluminum can be removed uniformly under the condition of maintaining a high beta molecular sieve crystallinity. Thus, the obtained beta molecular sieve can has the characteristics of high silicon-aluminum ratio, large specific surface area, appropriate acidity and acid distribution, and reasonable pore structure, etc., and especially has a suitable cracking effect and a very good isomerization effect on long-chain alkane and the long side chain alkyl of aromatic hydrocarbon and cyclane. A hydrocracking catalyst prepared from the beta molecular sieve can substantially reduce the condensation point of diesel oil fraction while maintaining a high diesel oil yield, thus achieving the effect of increasing the yield of low condensation point diesel oil.

Description

technical field [0001] The invention relates to a beta molecular sieve and a preparation method thereof, in particular to a beta molecular sieve capable of high-yield, high-quality, clean transportation fuel and high-quality chemical raw material as an active component of a cracking catalyst and a preparation method thereof. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability of raw materials, great flexibility of product schemes, high selectivity of target products, good product quality, and high added value. It can directly convert various heavy and low-quality raw materials into clean fuel oil and high-quality chemical raw materials. It has become one of the most important heavy oil deep processing techniques in modern oil refining and petrochemical industries, and has been increasingly widely used in countries all over the world. As the quality of crude oil is deteriorating year by year, high-sulfur crude oil has increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02B01J29/70B01J29/78
Inventor 刘昶王凤来杜艳泽赵红关明华
Owner CHINA PETROLEUM & CHEM CORP
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