Oil-soluble self-vulcanizing molybdenum catalyst, and preparation method, use method and application of oil-soluble self-vulcanizing molybdenum catalyst

Abstract

The invention provides an oil-soluble self-vulcanizing molybdenum catalyst, and a preparation method, a use method and an application of the oil-soluble self-vulcanizing molybdenum catalyst. The preparation method comprises the following steps of (1) sequentially putting a molybdenum source, water, sodium sulfide, a solvent and inorganic acid in a container under the protection of nitrogen, uniformly mixing and stirring, cooling to 5-50 DEG C for reaction for 10-150min, (2) adding alkylamine and carbon disulfide, uniformly stirring, heating to 60-200 DEG C for reaction for 3-10h, and (3) after reaction, sufficiently cooling a product, performing suction filtration, sufficiently washing with methanol, and drying to obtain the oil-soluble self-vulcanizing molybdenum catalyst. The oil-soluble self-vulcanizing molybdenum catalyst can be vulcanized and decomposed to form a molybdenum disulfide active component in situ, is used for a slurry reactor hydrocracking technology for poor heavy oil with a high metal content, a high carbon residue content and a high sulfur content, can reduce the coke yield, and keeps long-period operation of a device.

Description

Technical field [0001] The invention relates to a catalyst for the lightening process of heavy oil in a petroleum processing technology, in particular to an oil-soluble self-sulfurized molybdenum catalyst suitable for inferior heavy oil, its preparation method, use method and application. Background technique [0002] The slurry-bed hydrocracking of heavy oil is a thermal cracking process for heavy oil under high temperature and high hydrogen pressure. A small amount of catalyst is fully in contact with the raw material residue and hydrogen in the reactor, showing a fully backmixed state. The main function of the catalyst is to inhibit the coke formation of the residue during the cracking process, so as to achieve high conversion rate and low coke generation hydrogenation process. With the increasing proportion of domestic and imported inferior heavy oils in my country, how to deal with these inferior heavy oils with high metals (nickel, vanadium, calcium, etc.), high residual c...

AI Technical Summary

Problems solved by technology

At present, catalysts used for heavy oil slurry bed hydrocracking mainly include water-soluble catalysts and oil-soluble catalysts. Due to the complex dispersion process of water-soluble catalysts, high energy consumption, and difficulty in industrial application, it is necessary to develop new types of highly active oils. Soluble catalysts are important for the further promotion of heavy oil slurry bed hydrocracking technology

[0004] However, according to relevant literature and patent reports, during the use of the existing heavy oil slurry bed hydrocracking oil-soluble molybdenum catalyst, it is necessary to add a suitable sulfurizing agent to convert the molybdenum in the catalyst into molybdenum disulfide active components. There are two defects in the process: (1) The mixing equipment of vulcanizing agent and catalyst is added during the vulcanization process, which increases energy consumption; (2) The vulcanizing agent needs to react with hydrogen to generate hydrogen sulfide, and then hydrogen sulfide vulcanizes the catalyst to generate metal sulfide , this process takes a long time, which will cause the particle size of the catalyst to become larger, and it cannot guarantee that all the metal elements in the catalyst will be converted into metal sulfides, which will reduce the catalytic activity, so that the coke yield in the hydrocatalytic cracking process will not be low.

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