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Hydroconversion method

A technology for hydroconversion and hydrocracking tail oil, which is applied in chemical instruments and methods, hydroprocessing technology, molecular sieve catalysts, etc. It can solve the problems of not using aviation kerosene yield, desorption of cracked products, large microscopic size, etc. problems, achieve the effect of strong selective ring-opening ability, reduce the yield of light hydrocarbons, and improve selectivity

Pending Publication Date: 2022-07-08
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Feed materials include vacuum wax oil and other fractions at 350°C to 550°C. The heavy oil fraction has a large molecular size. Since the Y-type molecular sieve is mainly composed of micropore structures, and the larger mesopore structure is less, it is difficult for heavy oil molecules to make full use of Y. The surface and acidic sites of the type molecular sieve, the cracked products cannot be desorbed from the smaller micropores in time, resulting in excessive cracking, reducing the liquid yield and increasing the yield of light naphtha. Therefore, catalysts are required to provide a large number of larger pore structures, such as mesoporous structures above 3 nanometers

Method used

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Embodiment 1

[0048] The raw material oil A is used. The properties of the raw material oil A are shown in Table 1. The raw material oil A has the characteristics of high naphthenic and aromatic hydrocarbon content, relatively high nitrogen content and low viscosity index, and is a difficult-to-process raw material oil. The hydroconversion method provided by the present invention is adopted, wherein the carrier of the moderated cracking catalyst comprises a small-grain mesoporous modified Y molecular sieve.

[0049] The specific preparation method of the moderated cracking agent catalyst is as follows:

[0050] (1) place unmodified Y molecular sieve 10g Y-1 in a vacuum heating container for pretreatment, the pressure in the container is 5.06KPa, and the heating temperature is 60°C;

[0051] (2) preparation contains the mixed alkali solution 500mL of 0.5mol / L 1-propylamine and 0.01mol / L ammonia, then joins in the vacuum heating vessel of step (1) and stirs, still must make the container in t...

Embodiment 2

[0057]The difference from Example 1 is: changing the composition and concentration of the mixed alkali solution, and mixing with an aqueous solution of 0.3 mol / L isopropylamine and 0.20 mol / L ammonia to obtain small-grain mesoporous modified Y molecular sieve MY-2. And moderate cracking catalyst MC-2. The properties of the small-grain mesoporous modified Y molecular sieve MY-2 and the moderated cracking catalyst MC-2 are shown in Tables 2 and 3.

Embodiment 2-1 and 2-2

[0072] For two different real refinery feedstock oils (see Table 1 for the properties of feedstock oils A and B), feedstock oil A has the characteristics of high naphthenic and aromatic content, relatively high nitrogen content and low viscosity index. The total aromatics content of A is about 2 times that of feedstock oil B, and both feedstock oils A and B are treated by the method of Example 1 of the present invention. Raw material oil A adopts process condition 1 (ie, Example 2-1), and raw material oil B adopts process condition 2 (ie, embodiment 2-2).

[0073] The hydrotreating pre-refining catalyst and the mild cracking catalyst adopted by the two are the same, and the mild cracking catalyst is the catalyst prepared by using the molecular sieve modified by the method of Example 1 as described in the present invention. The process conditions are the same for the loading of different gradation ratios except the gradation ratio. The specific process conditions are shown in T...

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Abstract

The invention relates to a hydro-conversion method which comprises the following steps: preheating raw oil, sequentially carrying out hydrogenation pre-refining, mild cracking reaction and high-low oil-gas separation to obtain cracked oil, and carrying out vacuum fractionation to obtain at least two sections of hydrocracking tail oil. A carrier of a mild cracking catalyst adopted in the mild cracking reaction comprises a small-grain mesoporous modified Y molecular sieve, the grain size of crystals in the modified Y molecular sieve is smaller than 500 nm, the micropore volume is not smaller than 0.20 ml / g, the molar ratio of silicon oxide to aluminum oxide of a framework of the modified Y molecular sieve is 20-60, the content of sodium oxide is smaller than 0.1 wt%, the unit cell parameter is 2.430-2.435 nm, the relative crystallinity is 60-100%, and the mesoporous index M is 1.7-5.0. By using the method, the high-quality hydrocracking tail oil can be produced to the maximum extent while the quality of the hydrocracking tail oil is ensured.

Description

technical field [0001] The invention belongs to the field of hydrocarbon processing, and in particular relates to a hydroconversion method. The hydrocracking tail oil produced by the hydroconversion method has suitable viscosity and high viscosity index and can be used as lubricating oil base oil. Background technique [0002] The content of lubricating base oil in the finished lubricating oil usually accounts for as high as 70% to 98%, and the remaining 2 to 30% are additives to improve performance. The quality of the base oil directly affects the quality of the finished lubricating oil. At present, the production structure of my country's lubricating oil has the problem that the output of low-grade lubricating oil is large, the output of medium and high-grade lubricating oil is small, and the market gap of high-grade lubricating oil is large. [0003] The traditional production process of lubricating base oil is solvent process, which is mainly used to produce Class I base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02B01J29/16B01J35/10
CPCC10G67/02B01J29/166C10G2400/10B01J35/60
Inventor 王晶晶余颖龙赵梓贺王延飞袁晓亮王嘉祎张雅琳王燕张占全谢彬
Owner PETROCHINA CO LTD