New green process for preparing high-purity m-cresol
A technology of m-cresol and cresol, which is applied in the preparation of organic compounds, molecular sieve catalysts, physical/chemical process catalysts, etc., can solve the problems of harsh reaction conditions, many impurities, and difficult separation of meta-position and para-position, etc. The effect of processing
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Embodiment 1
[0017] Add 1mol of o-chlorotoluene, 2.3mol of sodium hydroxide (22%), 400ml of water, 5g of catalyst, and 3g of 18-crown-6 into the reactor, heat it to 270°C, keep it warm for 6h, stop the reaction, and drop to normal temperature and pressure. Then add hydrochloric acid until the pH value reaches about 5. After layering, add benzene to the water layer for extraction, rectify under reduced pressure, collect the fraction at 80°C, and collect the fraction at 84°C.
Embodiment 2~5
[0019] The reaction conditions of Examples 2-5 are basically the same as those of Example 1, except that the reaction temperature is changed, which is 250, 220, 200, and 180° C., respectively. The results obtained are as follows
[0020]
Embodiment 6~8
[0022] The reaction conditions of Examples 6-8 are basically the same as those of Example 1, except that the reaction time is changed to 4, 2, and 1 h, respectively. The results obtained are as follows
[0023]
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