Method and system for producing gasoline and propylene by integrating heavy oil catalytic cracking with oxygen-containing compound conversion

Abstract

The invention discloses a method and a system for producing gasoline and propylene by integrating heavy oil catalytic cracking with oxygen-containing compound conversion. The oil-gas separation part of the conventional heavy oil catalytic cracking device is integrated with a fixed bed reactor group for oxygen-containing compound catalytic conversion. The propylene and the gasoline are prepared from part of rich gas components in an oil-gas separator on the top of a catalytic cracking fractionating tower in an oil refinery and dry gas, light olefin components and organic oxygen-containing compounds from other crude oil secondary processing devices serving as raw materials under the action of a special catalyst, so that raw materials for catalytic cracking processing are expanded, the propylene yield of a catalytic cracking process is improved and the yield and quality of the gasoline can be improved. The invention provides a method and a device for increasing the yield of catalytic cracking gasoline and the propylene. The yield of catalytic cracking light olefin and the ratio of olefin products can be flexibly adjusted by only integrating the heavy oil catalytic cracking device with an oxygen-containing compound device; and the method and the system have the advantages of simple process, mature technology, small investment and easy implementation.

Description

technical field [0001] The present invention relates to a method and device for producing gasoline and propylene by catalytic cracking of heavy oil integrated with oxygen-containing compounds, more specifically, integrating oxygen-containing compounds in the product separation part of existing heavy oil catalytic cracking devices and other crude oil secondary processing devices The fixed-bed reactor group of catalytic conversion expands the raw materials of catalytic cracking, improves the yield of propylene and the quality and yield of gasoline, and flexibly adjusts the yield of catalytic cracking light olefins and the method and device of the ratio of olefin products. Background technique [0002] With the rapid development of my country's economy and the improvement of people's quality of life, the demand for plastic products such as high-grade clean gasoline and polyolefins has also increased rapidly. The main raw materials for these two types of products are refined gaso...

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Problems solved by technology

[0023] It can be seen from the prior art that methanol or other oxygen-containing compounds and petroleum hydrocarbons enter the catalytic cracking reactor at the same time, which is limited by the catalyst activity and selectivity, and the conversion rate of methanol and the selectivity of olefins are not high enough.

Due to the generally small processing volume and scattered production areas of my country's methanol production facilities, the new methanol-to-hydrocarbon process cannot form economies of scale

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