Horizontal efficient plug flow bubbling reactor

Abstract

The invention discloses a horizontal efficient plug flow bubbling reactor which is divided into a plurality of reaction units by an outlet partition plate and an inlet partition plate. Each reaction unit is provided with a liquid phase inlet guide plate and a liquid phase outlet guide plate and a gas distributor. The gas distributor comprises a main distributor horizontally arranged and a bow-shaped distributor distributed in a bow-shaped area of the reactor; each reaction unit is divided into a liquid phase guide area, a bubbling reaction area, a gas phase area and a liquid drop area. By designing and integrating the liquid phase inlet and outlet guide plates and the gas distributor, the liquid phase in the reactor is in a plug flow type, so that the decomposition and excessive oxidization of organic peroxides are reduced favorably, and the selectivity of a target product is improved.

Description

technical field [0001] The present invention relates to a high-efficiency horizontal bubbling reactor, in particular to a horizontal bubbling reactor for the production of organic hydroperoxides by contacting organic substances with a boiling point of 80-150°C at normal pressure with gaseous reactants, such as ring Hexane, ethylbenzene, cumene, etc. Background technique [0002] In gas-liquid contact reactors, common packed bed reactors, falling film reactors, plate reactors, bubble reactors, stirred reactors, spray reactors and high-speed turbulent reactors, among them, bubble reactors have Large liquid storage capacity, suitable for slow reaction and reaction with large heat release. This is especially suitable for the reaction of liquid-phase oxidation of organic matter into organic matter hydrogen peroxide, such as patent US4066706, ethylbenzene is oxidized to ethylbenzene hydroperoxide; patent US6956136, cumene is oxidized to cumene hydroperoxide; patent EP0673907 isob...

AI Technical Summary

Problems solved by technology

[0007] The uneven distribution of bubbles will also lead to another result. Due to the small amount of bubbles and low gas holdup near the inlet area, the density of this area is high, forming a density difference with the accessory material, which will push the bubbles in the bubbling area. Local circulation, resulting in a local stagnation area, the residence time of the oxidizing solution in the stagnation area will increase significantly, which causes an increase in the decomposition rate of organic hydrogen peroxide and reduces the selectivity of organic hydrogen peroxide; in addition, in the area near the outlet There are many bubbles, high gas holdup, and low density. The resistance of this area is smaller than that of the area with high density, and the liquid phase tends to flow out of this area, resulting in a higher flow rate in this area than other areas, which reduces the flow of liquid phase. The residence time in this area, and thus the residence time of the liquid phase flowing through the entire reactor is not the same, which affects the conversion rate and selectivity of the reaction

[0008] In addition, from the perspective of the circular section, the typical design is as reported in the patent CN200580028895 of the International Shell Research Co., Ltd., the gas phase distribution pipe is arranged at the bottom area of ​​the reactor, and the height of the liquid layer on each gas phase distribution pipe is different. The pressure is also different, which causes the gas distribution of the gas distributor to be uneven, forming a circular flow on the circular section, such as image 3

[0009] In order to reduce the problem of back-mixing, the patent CN106554298 of Wanhua Chemical Group Co., Ltd. uses a vertical bubble column reactor for the liquid-phase oxidation of ethylbenzene to produce ethylbenzene hydroperoxide. This type effectively improves the axial return of the liquid phase. Mixing, but radial back-mixing still has not proposed a solution. In addition, this type has caused the series operation of the gas phase. Based on the analysis of the 10-stage reaction section reported in the patent, the pressure drop of the gas phase in the reactor is higher than that of the horizontal parallel single-stage 10 times higher pressure drop in the air distribution version, which significantly increases the operating costs of industrial installations

Images