Modified molecular sieve capable of improving coking performance

A technology of coking performance and molecular sieve, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of the stability limitation of modified molecular sieves, the modulation performance not fully exerting the protection function of P on molecular sieves, etc. , to achieve the effect of good heavy oil cracking ability and coke selectivity, large, medium and large pore volume, and good stability

Active Publication Date: 2009-09-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the perspective of modification methods, P-treated molecular sieves mainly include two types. One is to modify the treated active components with P. This type of modification method mainly adjusts the performance and does not fully exert the effect of P on molecular sieves. protection function; the other is to directly introduce P into the modification process of molecular sieves. Most of these methods use rare earth modification or simultaneous modification of rare ea

Method used

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  • Modified molecular sieve capable of improving coking performance
  • Modified molecular sieve capable of improving coking performance
  • Modified molecular sieve capable of improving coking performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Get 100 grams (dry basis) NaY molecular sieve (92% of crystallinity, SiO 2 / Al 2 o 3 =4.94), pour into 1000g exchange solution (containing 0.63wt% (NH 4 ) 2 HPO 4 salt and 8.58 wt% NH 4 In the reactor of Cl), exchange at 90°C for 1h, and control the solution pH=3.0~3.5 during the exchange process, filter and wash after the exchange; after roasting at 650°C for 2h in the presence of 100% water vapor, pour the roasted product into Equipped with 1200g exchange solution (containing 0.38wt% RECl 3 and 7.8 wt% NH 4 Cl salt) in a reaction kettle, exchange at 90°C for 1h, and control the pH of the solution during the exchange process=6.0~6.5, filter after exchange, wash, and roast at 660°C for 2h in the presence of 70% water vapor to obtain the present invention Modified molecular sieve A1 that can improve coking performance, containing RE in weight percent 2 o 3 2.52%, P 1.13%, unit cell 2.440nm, crystallinity 49%.

Embodiment 2

[0060] Get 100 grams (dry basis) NaY molecular sieve (88% crystallinity, SiO 2 / Al 2 o 3 =4.78), pour into 900g exchange solution (containing 0.45wt% (NH 4 ) 2 HPO 4 salt and 10wt% (NH 4 ) 2 SO 4 ) in a reaction kettle at 90°C for 1 hour, and at the same time control the solution pH=4.0 to 4.5 during the exchange process, filter and wash after the exchange; after roasting at 650°C for 2 hours in the presence of 100% water vapor, pour the roasted product into the container 1000g exchange solution (containing 0.35wt% RECl 3and 1 wt% NH 4 Cl salt) in a reaction kettle, exchanged at 90°C for 1h, and controlled the solution pH=3.5 to 4.0 during the exchange process, filtered after the exchange, washed, and roasted at 700°C for 1h in the presence of 50% water vapor to obtain the present invention Modified molecular sieve A2 capable of improving coking performance, containing RE in weight percent 2 o 3 1.30%, P 0.58%, unit cell 2.438nm, crystallinity 45%.

Embodiment 3

[0062] Get 100 grams (dry basis) NaY molecular sieve (92% of crystallinity, SiO 2 / Al 2 o 3 =4.94), pour into 500g exchange solution (containing 1.58wt% H 3 PO 4 ) in a reaction kettle at 90°C for 2 hours, while controlling the pH of the solution to 4.0 to 4.5 during the exchange process, filtering and washing after the exchange; roasting at 600°C for 0.5h in the presence of 100% water vapor, pour the roasted product into Equipped with 400g exchange solution (containing 0.55wt% RECl 3 and 10.78wt% (NH 4 ) 2 SO 4 salt) in a reactor, exchanged at 90°C for 0.5h, and controlled the solution pH=6.0 to 6.5 during the exchange process, filtered after the exchange, washed, and roasted at 650°C for 1h in the presence of 100% water vapor to obtain the present invention Modified molecular sieve A3 capable of improving coking performance, containing RE in weight percent 2 o 3 1.44%, P 1.5%, unit cell 2.439nm, crystallinity 53%.

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Abstract

The invention relates to a modified molecular sieve capable of improving coking performance. The modified molecular sieve is prepared from a NaY type molecular sieve by the twice-crosslinking twice-roasting preparation method. According to the weight ratio, in the modified molecular sieve, the content of RE2O3 is 0.05 to 4 percent, the content of P is 0.05 to 5.0 percent; and the crystal cell of the modified molecular sieve is 2.430 to 2.440nm, and the crystallinity is between 35 and 55 percent. The modified molecular sieve has bigger hole volume of medium-and-large-sized holes and good stability; under the same condition of preparation process for catalyst, compared with the comparison molecular sieve, the modified molecular sieve has the advantages of reducing coke yield of the catalyst, simultaneously further improving the heavy oil cracking capability, further improving total liquid yield, and particularly facilitating the improvement of the yield of light oil.

Description

technical field [0001] The invention relates to a modified molecular sieve capable of improving coking performance, in particular to a modified molecular sieve used in a low-coking FCC catalyst. Background technique [0002] In the process of petroleum refining and petrochemical production, the deactivation of catalyst caused by carbon deposition is an important technical and economical problem. Any increase in coke production will lead to a decrease in unit processing capacity and conversion rate. The formation of coke is the result of many factors, mainly related to the properties of raw oil, catalyst activity, atomization effect, and reaction conditions. Among them, as far as the catalyst is concerned, since most of the catalytic reactions are mainly carried out on the active components of the catalyst, reducing the coke on the active components can reduce the reaction coke. [0003] In the FCC reaction process, there are mainly the following reactions on the active comp...

Claims

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Application Information

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IPC IPC(8): B01J29/08
Inventor 高雄厚王宝杰张忠东刘超伟张海涛石晓庆汪毅赵红娟赵晓争王莉
Owner PETROCHINA CO LTD
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