A kind of method utilizing the directional chlorination of benzene to synthesize m-dichlorobenzene and trichlorobenzene
A technology for m-dichlorobenzene and mestrichlorobenzene, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of complicated separation process, difficulty in realizing large-scale production of mestrichlorobenzene, etc. Simple and convenient process, reducing the production of chemical pollutants, and having the effect of atom economy
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Embodiment 1
[0026] Alkylation reaction: Add 100.0g of benzene and 948.1g of tert-butyl chloride into a 2000mL four-necked flask, stir thoroughly for 0.5h, cool down to -15°C, then add 17g of aluminum trichloride in batches within two hours, and At this temperature, the reaction was continued for 10 h. Subsequently, dilute hydrochloric acid was added to wash and remove the inorganic salts in the system. The resulting oil layer was distilled to recover 545.1 g of tert-butyl chloride to obtain 301.3 g of tri-tert-butylbenzene with a content of 98.6%.
[0027] Chlorination reaction: Add 301.3g of tri-tert-butylbenzene and 600g of chloroform into a 2000mL four-necked flask, then add 16.2g of aluminum trichloride and 22.7g of diphenyl sulfide, stir thoroughly for 0.5 hours, control the system temperature at 20°C, Chlorine gas 25g / h was introduced, and chlorine gas was continuously passed for 5.5h. Subsequently, dilute hydrochloric acid was added to wash and remove inorganic salts in the system,...
Embodiment 2-5
[0030] On the basis of Example 1, in the alkylation reaction part, different alkylating reagents were used (the number of moles was constant), and other conditions were constant. The obtained results are shown in Table 1.
[0031] Table 1 The influence of different alkylation reagents (alkylation reaction part) on the product yield
[0032]
[0033]
Embodiment 6-9
[0035] On the basis of Example 1, the chlorination reaction part adopts different catalyst systems, and other conditions remain unchanged. The obtained results are shown in Table 2.
[0036] Table 2 The influence of different catalyst systems (chlorination reaction part) on product yield
[0037]
PUM
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