Etherification catalytic rectification method and device for increasing gasoline octane number

Abstract

The invention relates to an etherification, catalysis and rectification method and device for increasing the gasoline octane number. The device comprises a catalysis and rectification tower of a nested and coupled structure, and the tower sequentially comprises a rectification section, a multi-stage unit catalysis and fractionation section, a middle fractionation section, a tube shell structure catalysis and fractionation section and a stripping section from top to bottom. By means of the structure of the tube shell structure catalysis and fractionation section, thermal coupling can be carried out on tube pass reaction heat dissipation and jacket fractionation heat absorbing, so that increasing of temperature of a catalyst bed layer is effectively prevented, the catalyst bed layer is prevented from being overheated, and energy consumption is reduced to the largest extent. By means of the structure of the multi-stage unit catalysis and fractionation section, a catalyst component is fixedly connected to the lower side of a tower plate and covers all gas channels of the tower plate, the product of ether flows down through a downcomer stage by stage and does not make contact with catalysts, stay time of the product of ether in the catalysts can be better shortened, secondary contact of the product of ether and the catalysts is avoided, and the problem that in the prior art, the reaction product of ether makes contact with the catalysts repeatedly when flowing down along with liquid and accordingly a reverse reaction is caused is solved.

Description

[0001] The invention relates to an etherification catalytic rectification method and device for increasing gasoline octane number, belonging to the oil product processing technology in the field of petrochemical industry. Background technique [0002] The main blending component of commercial gasoline in my country is FCC gasoline, accounting for more than 80% of the gasoline content. The composition of FCC gasoline in my country is characterized by high olefin content and poor stability. It is necessary to reduce olefins to meet the restrictions on gasoline olefin content. On the other hand, the light gasoline fraction is rich in C 5 and C 6 Tertiary olefins, using tertiary olefins to react with low-carbon alcohols to form ethers with high octane numbers, can simultaneously achieve the dual purposes of reducing olefins in gasoline and increasing gasoline octane numbers. [0003] The etherification reaction of tertiary olefins and alcohols is an effective way to increase the...

AI Technical Summary

Problems solved by technology

Aiming at the characteristics of the etherification reaction of active olefins and low-carbon alcohols in light gasoline, the prior art has the following deficiencies. One is that the large amount of heat released by the reaction cannot be effectively utilized when the process of combining the reactor with the catalytic distillation tower is adopted. At the same time, it is also easy to generate hot spots in the catalyst bed; the second is that the reaction section of the catalytic rectification tower with a traditional structure is difficult to avoid the reverse reaction caused by the continuous contact of the etherification reaction product with the lower catalyst when it flows downward through the catalyst bed

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