Heavy oil processing method and system

Abstract

The invention provides a heavy oil processing method and system. The method at least comprises the following steps: (1) heavy oil cracking and gasification: heavy oil is subjected to heavy oil cracking and gasification, and at least cracking gas, synthesis gas and cracking oil are obtained; (2) cracking oil hydrocracking: carrying out hydrocracking on the cracking oil obtained in the step (1) to obtain a product containing dry gas, low-fraction gas, light naphtha, heavy naphtha and diesel oil; (3) aromatic hydrocarbon combination: by taking the heavy naphtha obtained in the step (2) as a raw material, performing aromatic hydrocarbon combination to obtain a product containing hydrogen, benzene and p-xylene and byproducts containing liquefied petroleum gas, pentane, raffinate oil and heavy aromatic hydrocarbon; (4) methanol synthesis: taking part of pyrolysis gas and synthesis gas obtained in the step (1) as raw materials, and performing methanol synthesis to obtain a methanol product; and (5) ethanol synthesis: taking the residual pyrolysis gas and synthesis gas obtained in the step (1) as raw materials, and carrying out ethanol synthesis to obtain an ethanol product.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular, the invention relates to a heavy oil processing method and system. Background technique [0002] Typical technologies for heavy oil processing are divided into two types: decarburization and hydrogenation. The representative technologies of the first type of decarburization process are delayed coking and flexible coking. Due to the non-hydrogenation process, the coke generation rate of this type of technology is relatively high, and the coke utilization In particular, there are difficulties in high-sulfur petroleum coke. Flexible coking adopts the air gasification mode to produce low calorific value gas, which is mainly used for power generation, but the efficiency and benefit of coke utilization are not high; the representative technology of the second type of hydrogenation process is fixed bed residual oil processing Hydrogen, ebullating bed hydrocracking, suspended bed hydr...

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Problems solved by technology

[0002] Typical technologies for heavy oil processing are divided into two types: decarburization and hydrogenation. The representative technologies of the first type of decarburization process are delayed coking and flexible coking. Due to the non-hydrogenation process, the coke generation rate of this type of technology is relatively high, and the coke utilization In particular, there are difficulties in high-sulfur petroleum coke. Flexible coking adopts the air gasification mode to produce low calorific value gas, which is mainly used for power generation, but the efficiency and benefit of coke utilization are not high; the representative technology of the second type of hydrogenation process is fixed bed residual oil processing Hydrogen, ebullating bed hydrocracking, suspended bed hydrocracking, etc. These technologies significantly reduce the coke yield, but due to high operating pressure, investment and operating costs are high

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