- Preparation method of N, N-dimethyl p-phenylenediamine hydrochloride
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The invention relates to the technical field of organic synthesis, and particularly relates to a preparation method of N, N-dimethyl p-phenylenediamine hydrochloride, which comprises the following steps: (1) dissolving p-nitrochlorobenzene in toluene to obtain a solution A; (2) dissolving dimethylamine hydrochloride in water, and adding the solution A; (3) under stirring, dropwise adding a sodiumhydroxide aqueous solution into the solution, heating, dropwise adding the sodium hydroxide aqueous solution, and carrying out heat preservation reaction; (4) standing, separating phases, adding a catalyst into a toluene layer, and carrying out hydrogenation reduction; (5) filtering and separating the catalyst; introducing hydrogen chloride gas into the toluene layer to obtain N, N-dimethyl p-phenylenediamine hydrochlorideprecipitate; (6) centrifuging to obtain the N, N-dimethyl p-phenylenediamine hydrochloride. In the process, dimethylamine hydrochloride is added with sodium hydroxide to release dimethylamine and react in time, so that the process is mild, efficient and safe; the three wastes are less.
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Paragraph 0027-0050
(2019/07/16)
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