Combined process of hydrotreatment-catalytic cracking for residuum

A residual oil hydrogenation and catalytic cracking technology, applied in hydrotreating process, petroleum industry, treatment of hydrocarbon oil, etc., can solve the problems of increasing the load of the residual oil hydrogenation unit, and insufficient utilization of the oil slurry residue.

Inactive Publication Date: 2013-08-21
PETROCHINA CO LTD
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Problems solved by technology

However, the residue from the oil slurry has not been fully utilized. At the same time, the saturated hydrocarbons in the refined oil will undergo corresponding cracking reactions after entering the residual oil unit, resulting in non-ideal components, and at the same time increase the load of the residual oil hydrogenation unit.

Method used

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  • Combined process of hydrotreatment-catalytic cracking for residuum
  • Combined process of hydrotreatment-catalytic cracking for residuum

Examples

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specific Embodiment approach

[0024] The residual oil hydrogenation unit used in the examples and comparative examples is a fixed-bed residual oil hydrogenation one-liter four-reactor pilot plant produced by Xytel Corporation of the United States. The device has four reactors in total, which are filled with protective agents, demetallizers, and desulfurization agents respectively. agent and denitrification agent, the properties of the catalyst are shown in Table 1. The gradation ratio is 5:40:30:25, and the catalyst is independently developed by the laboratory. The catalytic cracking test in the embodiment and the comparative example is carried out on the small-scale riser reactor pilot plant that the laboratory designs by itself, and the catalyst used is as shown in table 1.

[0025] Table 1 The present invention uses the main physicochemical property of residual oil hydrogenation catalyst

[0026]

Embodiment 1

[0028] Residue, fractionation tower middle distillate oil (mass composition: 100:9, see Table 2 for properties) and hydrogen are mixed and directly enter the residual oil hydrogenation pilot plant, and react according to the conditions in Table 3, and the reaction products are separated into gas, Hydrogenated naphtha, hydrogenated diesel oil, hydrogenated residual oil, product distribution and operation conditions are shown in Table 4; hydrogenated residual oil and extraction tower raffinate (mass composition is 98:9, properties see Table 2) enter the catalytic In the cracking unit, the products are separated into dry gas, liquefied gas, catalytic cracking gasoline, catalytic cracking diesel oil, catalytic cracking cycle oil and oil slurry. The reaction conditions are shown in Table 3, and the product distribution and operation status are shown in Table 5. The catalytic cracking cycle oil and oil slurry enter the extraction separation tower, the extraction solvent is a mixture ...

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Abstract

The invention relates to a combined process of hydrotreatment-catalytic cracking for residuum. According to the invention, the residuum and hydrogen are introduced into a residuum hydrogenation apparatus to be separated into dry gas, hydrogenated naphtha, hydrogenated diesel oil and hydrogenated residuum; the hydrogenated residuum is introduced into a catalytic cracking apparatus to react and be separated into the dry gas, liquefied gas, catalytic gasoline, heavy cycle oil and oil slurry; the heavy cycle oil and the oil slurry are introduced into a solvent extraction apparatus; a raffinate returns back to the catalytic cracking apparatus; an extract phase is introduced into a fractionating tower for separation, wherein a tower top is an extraction solvent, a lateral line is intermediate fractions and a tower bottom is heavy fractions; the extraction solvent returns back to the solvent extraction apparatus; the intermediate fractions are sent to the residuum hydrogenation apparatus; part of the intermediate fractions are sent to a lubricating oil apparatus; and the heavy fractions at the tower bottom is used as an asphalt improver to produce the asphalt. According to the method, aromatic hydrocarbon which is used as a raw material of the residuum hydrotreatment is increased in content and reduced in viscosity, contents of sulfur, nitrogen, metal and other impurities are reduced, and severity for operating the apparatus is reduced.

Description

technical field [0001] The method belongs to the combined process method of hydrotreating, more specifically, it is a process method combining residual oil hydrotreating and catalytic cracking. Background technique [0002] At present, the world's oil refining and processing industry is facing the severe challenge of increasingly heavy and inferior crude oil resources. In 2008, my country's crude oil processing volume was 342 million tons, of which heavy crude oil processing volume reached 137 million tons, accounting for more than 40% of the total. As we all know, the proportion of residual oil in crude oil is usually 45-75%, and its properties are significantly inferior to fractions such as gas oil with a lower boiling range. Therefore, the pressure for deep processing of crude oil to maximize the production of light products and chemical raw materials naturally falls on on the residual oil. [0003] Among the optional technical routes for deep processing of residual oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/04
Inventor 范建光赵愉生崔瑞利胡长禄赵元生谭青峰程涛周志远于双林刘元东张志国张春光那美琦
Owner PETROCHINA CO LTD
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