Method and device for recycling catalyst particles in crude toluene diamine
A technology of catalyst particles and crude toluene diamine, which is applied to the device used to realize the method, and the field of catalyst particle recovery and utilization, can solve the problems of difficult separation of catalyst particles, achieve long continuous operation period, high separation efficiency, compact and simple structure Effect
Active Publication Date: 2013-11-20
SHANGHAI HUACHANG ENVIRONMENT PROTECTION
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Problems solved by technology
[0012] The technical problem to be solved by the present invention is to provide a method and device for recycling catalyst particles in crude toluenediamine in view of the problem of difficult separation of catalyst particles in crude toluenediamine in the prior art
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Embodiment 1
[0033] In a 160,000-ton / year TDI production unit, the method and device of the present invention are used to separate crude toluenediamine, so as to recycle the catalyst and reduce the load of subsequent refining units. The specific operation process and effects are as follows:
[0034] 1>The nature of the crude toluenediamine to be processed:
[0035] Crude toluenediamine solution is mainly composed of water, meta-toluenediamine, ortho-toluenediamine, trace para-toluenediamine and catalyst, with a density of about 1100kg / m 3 , the viscosity is 2.273-3.851 centipoise, the toluene diamine content is about 57%wt, the catalyst content is 2-5%wt, and the catalyst skeleton density is about 1600kg / m 3 , the average particle size of the catalyst is 3.735 μm, and the solution temperature is 70-90°C.
[0036] 2> The treatment process of crude toluenediamine:
[0037]The crude toluenediamine first enters the buffer settling tank 1, and after 0.5 to 3 hours of gravity settling, the lar...
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Abstract
The invention discloses a method and a device for recycling catalyst particles in crude toluene diamine in a process for preparing toluene diamine by high-pressure hydrogenation of dinitrotoluene. The method and the device can effectively recycle the catalyst particles in crude toluene diamine and realize the cyclic utilization of a catalyst, the method is high in separation efficiency and long in continuous running period, and the device is compact and simple in structure, small in floor space, strong in shock resistance, and simple in operation and maintenance. The technical points of invention are as follows: the device for recycling the catalyst particles in crude toluene diamine comprises a buffer precipitation tank, a centrifugal pump, a primary micro-cyclone concentrator, a secondary micro-cyclone clarificator, a catalyst storing tank and a screw pump; and the recycling method comprises gravity settling in the buffer precipitation tank, concentration treatment by the primary micro-cyclone concentrator, clarification treatment by the secondary micro-cyclone clarificator and the cyclic utilization of a concentrated catalyst.
Description
technical field [0001] The invention relates to a process for preparing toluenediamine by high-pressure hydrogenation of dinitrotoluene, in particular to a method for recycling catalyst particles in crude toluene diamine produced therein, and a device for realizing the method. Background technique [0002] TDA is the abbreviation of meta-toluene diamine, which is the main raw material for the production of toluene diisocyanate (TDI). The product quality and output of TDA directly affect the production and separation process of TDI, as well as the quality of the final product. At present, the phosgene method is still used to produce TDI at home and abroad, and the reaction roughly includes the following five processes: the reaction of carbon monoxide and hydrogen to generate phosgene, the reaction of toluene and nitric acid to generate dinitrotoluene (DNT), and the reaction of dinitrotoluene (DNT) with Hydrogen reacts to generate toluene diamine (TDA), the treated dry TDA rea...
Claims
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IPC IPC(8): C07C211/51C07C209/36
CPCY02P20/584
Inventor 吕文杰汪华林黄渊杨强吴文峰沈玲崔馨黄聪
Owner SHANGHAI HUACHANG ENVIRONMENT PROTECTION