A method of preparing an o-phenylenediamine intermediate used for carbendazim production
A technology of phenylenediamine and carbendazim, which is applied in the field of preparation of intermediate o-phenylenediamine, can solve the problems of reduced safety and cleanliness, increased equipment investment and energy consumption, and increased product post-processing procedures, so as to save synthesis cost, meet the requirements of process design, and optimize the effect of process design
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[0025] see figure 1 Shown, the technical scheme that the present invention adopts is: a kind of preparation method of the intermediate o-phenylenediamine that is used for the production of carbendazim, the concrete of described preparation method comprises the following steps:
[0026] (1). Initial reaction: transfer a certain amount of o-nitrochlorobenzene and a certain concentration of concentrated ammonia into an autoclave connected in six stages, set the temperature and pressure inside the autoclave, and react for a period of time to obtain o-nitrochloride Base aniline solution, obtain by-product;
[0027] (2). Ammonia recovery: The discharge liquid containing o-nitroaniline is flashed through the flash tower to recover the excess ammonia gas generated, and then the liquid phase is heated up through the deammonization tower to further recover ammonia gas. The recovered ammonia gas Absorbed under pressure through the ammonia absorption tower;
[0028] (3).Water washing: A...
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