Method of dense raw material hydrotreatment-catalytic cracking for improving propylene productivity

Abstract

The invention discloses a heavy raw material hydrotreating-catalytic cracking method to increase propone productivity, which comprises the following steps: choosing light circling oil and or weight circling oil from catalytic cracking unit; adding into hydrogenation reaction zone with heavy cut oil; or adding into two hydrogenation reaction zone with different hydrogenation catalyst to react; getting effluent; cooling; separating; fractionating; getting heavy liquid phase fraction; moving catalytic cracking unit; separating the catalytic cracking reacting product; getting the final product. This invention can dispose cycloalkyl heavy raw material, which propone receiving ratio can increase by 5-7 percent dot.

Description

technical field The invention belongs to a hydrotreating process, a multi-step process of catalytic cracking steps in the absence of hydrogen, more specifically, a method for hydrotreating heavy raw materials-catalytic cracking to increase the yield of propylene . Background technique The traditional petrochemical industry is based on steam cracking to produce ethylene. In the next few decades, my country's national economy will continue to grow rapidly, and GDP will increase by more than 7% per year on average. The rapid growth of the national economy will promote the rapid development of my country's petrochemical industry. However, if the petrochemical industry is developed with traditional technology, it is predicted that by 2020 my country's demand for chemical light oil will reach 76-83 million tons. There is a huge gap. In addition, if the petrochemical industry takes the traditional route of steam cracking to ethylene, it will become uncompetitive due to the high c...

AI Technical Summary

Problems solved by technology

This method converts catalytic cracking oil slurry into light oil products, improves the yield of gasoline and diesel oil, and reduces the yield of heavy oil, but the yield of propylene is low in this method

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