Heavy distillate oil hydrotreating method

Abstract

The invention relates to a method for hydrotreating heavy oil, in particular to the method for hydrotreating heavy oil, which improves the quality of diesel oil. Heavy distillate oil and animal and vegetable oil are used as raw material oil; under the hydrotreatment condition, the raw material oil and hydrogen gas are mixed and pass through a hydrotreatment reaction region; hydrogen-rich gas which is obtained by separating oil generated by hydrotreatment is circulated and utilized; and liquid obtained by separation is distillated to prepare a diesel oil product and hydrogenated wax oil. Compared with the prior art, the method can effectively improve the material source of a wax oil hydrotreatment device, ensure the quality of the hydrogenated wax oil, substantially increase the quality ofthe hydrotreated diesel oil and improve the storage stability of the animal and vegetable oil as fuel oil.

Description

Technical field [0001] The invention relates to a hydrotreating method, in particular to a method for improving the quality of diesel oil obtained by a heavy distillate hydrotreating process. Background technique [0002] At present, the global trend of heavy crude oil quality and deterioration is accelerating, and the continuous development of the world economy and the increasingly stringent environmental regulations require the production of a large number of light clean fuels. These require the improvement and improvement of existing refining technologies while adding new ones. Of petroleum substitutes, and produce products that meet the requirements at the lowest cost. [0003] Among the processing methods for producing light products from heavy raw materials, fluid catalytic cracking (FCC) still occupies an important position. With the deterioration of crude oil quality and the requirements of environmental protection laws and regulations, the quality of light oil directly p...

AI Technical Summary

Problems solved by technology

The raw materials used in these patents are conventional raw materials, and this technology does not produce diesel products, or the cetane number of diesel products is less than 50, usually less than 48, and high-quality and qualified diesel products cannot be directly produced

[0006] Existing animal and vegetable oil processing technology, Chen Lingxia and others mentioned "Research and Development of Soybean Oil Hydrogenation Highly Active Catalyst" in "Henan Chemical Industry" 2002, No. 3, pp. 21-22, and Jin Wencai et al. On pages 66-67 of Issue 1 of 2019, technologies such as “Evaluation of Nickel Catalyst Activity for Fatty Acid Hydrogenation” are mentioned, all of which are shallow hydrogenation to produce stearic acid, which cannot be directly used as diesel oil

[0007] EP1741767 and EP1741768 disclose a method for producing diesel oil fractions from animal and vegetable oils, mainly through hydrogenation of animal and vegetable oils, and then through an isomerization catalyst bed to obtain low-condensation diesel components, but the process is complicated. After passing through the isomerization catalyst bed, a certain degree of cracking reaction occurs, and the yield of diesel oil decreases