TDA dehydrating tower

Abstract

The invention disclose a TDA dehydrating tower, which comprises a tower body, a circumfluence supply pipe, a recycle gas phase inlet and a TDA feeding hole. An upper distributing groove communicated with the circumfluence supply pipe is formed at the top in the tower body, an upper packing layer is arranged below the upper distributing groove, a liquid catch plate is arranged at the lower part of the upper packing layer, a liquid receiving tank is fixed at the lower part of the liquid catch plate, a liquid downtake communicated thereof is arranged at the bottom of the liquid receiving tank, the liquid downtake is communicated with a lower distributing groove formed at the lower part of the liquid downtake, and a lower packing layer is arranged at the lower part of the lower distributing groove. The TDA dehydrating tower has the advantages of simple structure, easy disassembly and assembly, low cost, high degree of the heat change and quality change of two phases of gas and liquid, good separating effect and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a TDA dehydration tower. Background technique [0002] In the production process of tolenediamine (TDA), a large amount of water will inevitably be produced, and in the phosgenation process of tolenediamine, even a small amount of water will cause yield loss and equipment corrosion. Therefore the water in the toluenediamine must be removed. At present, the method of dehydrating TDA in China adopts the rectification method of plate floating valve tower. There is a circular valve hole on the floating valve tower tray, and a valve plate that can float up and down in an appropriate range is installed in the hole. When working, the gas flows from The valve hole rises, opens the valve plate, passes through the annular gap, and then blows into the liquid layer in the horizontal direction to form foam to achieve the purpose of absorption. The float valve is the ga...

AI Technical Summary

Problems solved by technology

At present, the method of dehydrating TDA in China adopts the rectification method of plate floating valve tower. There is a circular valve hole on the floating valve tower tray, and a valve plate that can float up and down in an appropriate range is installed in the hole. When working, the gas flows from The valve hole rises, opens the valve plate, passes through the annular gap, and then blows into the liquid layer in the horizontal direction to form foam to achieve the purpose of absorption. The float valve is the gas-liquid mass transfer element of the float valve tower. The float valve tower has the following disadvantages: 1) When the gas velocity is low, there is still liquid leakage from the tray, resulting in a decrease in the efficiency of the tray; 2) The valve plate of the float valve may be stuck and blown off, which will cause difficulties in operation and maintenance; 3) The pressure drop of the tray is large, which hinders the application under high gas phase load; 4) Liquid flooding is prone to occur in the rectification operation, and the anti-risk operability is poor

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