Catalytic distillation tower structure

Abstract

A catalytic distilling tower for catalytic reaction and distilling separation at the same time features that the catalyst with equivalent size of 6-100 mm and forming a bed over 40% porosity is randomly stacked on a distilling tray (optinally selected sieving tray), and the liquid-phase material passes through the catalyst bed layer horizontally while the gas-phase material passes through the catalyst bed layer axially.

Description

technical field [0001] The invention relates to a catalytic distillation tower structure capable of carrying out catalytic reaction and distillation separation at the same time, that is, a catalyst loading method in the distillation tower. Background technique [0002] The catalytic distillation technology enables the separation of the reaction and the product to be carried out in the same catalytic distillation tower, and the separation of the product and the reactant is realized while the reaction is in progress, and the balance of the reaction is broken, so that the reaction tends to be complete and the conversion rate of the reactant is improved; in addition, The heat generated by the reaction can vaporize part of the materials, so that the reaction temperature can be kept constant, and at the same time, energy consumption can be reduced, the process flow can be simplified, and investment can be reduced. The catalytic distillation tower is generally composed of three sec...

AI Technical Summary

Problems solved by technology

US4,471,154 is to pack catalyst in the catalyst bag that fluid can pass through but not make catalyst pass through by fabric and stainless steel mesh, then these bags are placed on the fractionating tray of reaction distillation section, because adopted The bed formed by the conventional catalyst has a relatively low porosity. When the vapor phase flowing upward on the tray passes through the catalyst bed, the catalyst is in a fluidized state to increase the porosity of the bed, although the vapor and liquid can be mixed with the catalyst at the same time Contact, but the horizontal flow of the liquid will inevitably push the catalyst in the fluidized state to one side of the packaging net, resulting in uneven distribution of the fluid in the bed. In addition, the catalyst is in a fluidized state for a long time, which will inevitably cause wear of the catalyst

[0008] It can be seen that the first structure is suitable for the process in which the volatility of the reaction medium is not very different, and the reaction mainly occurs in the liquid phase, but it is not suitable for the reaction process with a large difference in the volatility of the reaction medium (such as hydrogenation, selection, etc.) Hydrogenation), because the volatility of hydrogen is very different from that of general components, the hydrogen content in the stream entering the catalyst bed is very low, resulting in very low reaction efficiency

[0009] The second structure catalyst has a cumbersome filling process. The reaction medium has to diffuse into the bag to react with the catalyst, and the reaction product has to diffuse out.

[0010] The third structure can make the reaction medium with relatively large difference in volatility contact with the catalyst at the same time, but in order to make the amount of hydrogen in each bed relatively uniform, multiple flow meters should be used to control, and the remaining hydrogen in the lower bed will be reacted Can no longer contact with the catalyst in the upper bed to participate in the reaction, so a large amount of hydrogen is used

[0011] The main problem of the fourth structure is that it is difficult to ensure that the filler and the catalyst are evenly distributed in the radial direction, and the catalyst loading is also relatively complicated.

[0012] The main problem of the fifth structure is that the structure is complex, the catalyst must be packed in a certain structure, and then fixed on the distillation tray, the on-site operation is difficult, and the loading and unloading of the catalyst is troublesome.

However, the requirements for the molding method and molding quality of the catalyst are relatively high.

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