High-efficiency hydrogenation device and dinitrotoluene hydrogenating method

Abstract

The invention relates to a high-efficiency hydrogenation device and a dinitrotoluene hydrogenating method. Three hydrogenation reactors are connected in parallel and are all connected with a hydrogenation aging machine in series; the bottom part of an inclined grid plate separator (7) is connected with the bottom parts of the three hydrogenation reactors in parallel, and the top part of the inclined grid plate separator (7) is connected with a steam-liquid separator tank which is connected with inclined grid plate separators (8) and (9) in parallel; the top parts of the inclined grid plate separators are connected with a tolylenediamine finished product tank in parallel, and the bottom parts of the inclined grid plate separators are connected with a catalyst recovery tank in parallel; andthe bottom part of the catalyst recovery tank is connected with the top parts of the three hydrogenation reactors in parallel through a diaphragm pump. In the invention, the size of the hydrogenationreactors are reduced considerably, the power of a stirring motor is lowered, and the energy conservation and consumption reduction of the device are realized.

Description

technical field [0001] The invention relates to an efficient hydrogenation reaction device and a dinitrotoluene hydrogenation method. Background technique [0002] Hydrogenation reaction is an important step in the three core reactions of nitration, hydrogenation and photochemical production in TDI production, and is one of the key technologies in TDI production. Hydrogenation reactor is the core production equipment of hydrogenation reaction, and its technological advancement directly affects TDI The level of production cost and the process stability of the whole production line. [0003] The hydrogenation reaction equation of dinitrotoluene hydrogenation to generate toluenediamine is as follows: [0004] [0005] The hydrogenation reaction is a reaction with a large heat release, and the reaction heat must be transferred in time, so there is a cooler with a large heat transfer surface in the reactor. This reaction is a gas-liquid-solid three-phase reaction, and strong...

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Problems solved by technology

The DNT hydrogenation reaction rate is greatly affected by the DNT concentration. It is a 0-order reaction in the high-concentration area (≥600PPm), and a 1-order reaction in the low-concentration area (≤600PPm). According to the principle of reaction kinetics, the two-stage series can be greatly improved. The reaction driving force of the reactor is improved, the reaction volume is reduced, and the reaction efficiency is improved. Therefore, the present invention adds protection to the reactor. Through the operation of two kettles in series, the reaction volume is greatly reduced, and the excessive stirring motor of the reactor and the production energy consumption are solved. High, frequent mechanical failures and other issues

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