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Method for selective hydrocracking of light oil

A hydrocracking and selective technology, applied in chemical instruments and methods, hydrocarbon oil cracking, petroleum industry, etc., can solve the problem of high production cost, achieve high light oil selectivity, high chemical raw material selectivity, and diffusion-friendly technology. Effect

Active Publication Date: 2012-07-04
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This synthesis method has high production cost in industrial production

Method used

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  • Method for selective hydrocracking of light oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare the directing agent and mother liquor according to Comparative Example 1. After the mother liquor is prepared, add 4.0 g of solid β molecular sieve with a silicon-aluminum ratio of 25 to the mother liquor of Y molecular sieve, and stir vigorously to obtain a suspension containing β molecular sieve, then add the guiding agent dropwise into the mother liquor, and stir vigorously 20min. The above materials were placed in a 300mL polytetrafluoroethylene-lined crystallization kettle, aged at room temperature for 24h, and then crystallized at 100°C for 22h. After the crystallization is completed, filter and wash until the pH of the filtrate is less than 9, and dry to obtain the Na-type β / Y composite molecular sieve. Add β / Y composite molecular sieve to 1.0mol L -1 NH 4 NO 3 In the aqueous solution, the solid-to-liquid ratio was 1:10, and stirred in a constant temperature reactor at 95°C for 3h. After the exchange, filter and wash until neutral, fully dry, and roa...

Embodiment 2

[0025] Prepare the directing agent and mother liquor according to Comparative Example 1. Then the directing agent was added dropwise to the mother liquor and stirred vigorously for 20 minutes. Then add 4.0g of solid β molecular sieve with a silicon-aluminum ratio of 25 into the synthesis system of Y molecular sieve, and after vigorous stirring to obtain a suspension containing Y molecular sieve, put the above material in a 300mL crystallizer with a polytetrafluoroethylene liner. In the kettle, it was aged at room temperature for 24h, and then crystallized at 100°C for 22h. After the crystallization is completed, filter and wash to pH-1 NH 4 NO 3 In the aqueous solution, the solid-to-liquid ratio was 1:10, and stirred in a constant temperature reactor at 95°C for 3h. After the exchange, filter and wash until neutral, fully dry, and roast in a muffle furnace at 500°C for 3 hours to obtain H-type β / Y composite molecular sieves.

[0026] The rest of the steps were prepared acc...

Embodiment 3

[0028] The addition of the β molecular sieve among the embodiment 1 is increased to 7g, and the content of the β molecular sieve in the composite molecular sieve becomes 30% this moment, all the other steps are unchanged, and the gained catalyst is recorded as Cat-B-3.

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Abstract

The invention relates to a method for selective hydrocracking of light oil. A catalyst used in the method comprises an acidic carrier and metal oxides NiO and WO3, wherein the acidic carrier comprises two porous beta / Y composite molecular sieves and a mesoporous amorphous silicon / aluminum, and the metal oxides are loaded on the acidic carrier; the two porous beta / Y composite molecular sieves are used for ammonium exchange and organic acid pretreatment, and the two treatment methods are carried out in one process; ammonium salt used in the ammonium exchange is NH4NO3 or NH4HCO3, and the mass ratio of the beta / Y composite molecular sieves and the ammonium salt solution is (1-10):1; the solution of one or mixture of any of citric acid, tartaric acid, acetic acid, malic acid and oxalic acid is used for treatment of the beta / Y composite molecular sieves, and the concentration of the organic acid in the treatment system is 0.5-2.0 mol.L-1; the potential content of aromatic hydrocarbon in heavy naphtha in products obtained in cracking is high, and the exhaust oil has a lower BMCI (Bureau of Mines Correlation Index) value.

Description

Technical field: [0001] The invention relates to a method for selective hydrocracking of light oil and the application of a β / Y composite molecular sieve catalyst in selective hydrocracking of light oil. Background technique: [0002] Chinese patent CN1059846C discloses a light oil type hydrocracking catalyst, which is composed of: Y-type molecular sieve 50wt%-65wt%, small-pore alumina 10wt%-26wt%, tungsten oxide 18wt%-26wt%, nickel oxide 4wt% ~ 6wt%. The molecular sieve used in the carrier is a low-sodium high-silicon Y-type molecular sieve obtained after being treated with ammonium hexafluorosilicate aqueous solution, and the small-pore alumina is a pseudo-gillite crystal phase. The Y-type molecular sieve and small-pore alumina are mixed and molded, and the carrier is obtained through certain treatment in an ammonia-water vapor atmosphere, and then impregnated with nickel-tungsten metal and dried and roasted to prepare a finished catalyst. The catalyst has good activity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G47/20B01J29/80
Inventor 孙发民周亚松戴宝琴魏强张志华田然吕倩段爱军赵野王东青王甫村李海岩秦丽红马守涛杨忠华邴淑秋
Owner PETROCHINA CO LTD
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