A method for selectively producing dichloro-p-xylene
A technique for the ratio of p-xylene and dichloride, which is applied in the field of preparation of dichloro-p-xylene, can solve the problems of easy carbon deposition, deactivation, and coking of catalysts, and achieve improved selectivity, process safety, high production efficiency, The effect of simple process
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Embodiment 1
[0041] The effective reaction volume of the tank reactor is 500L. Feed 180 kg of p-xylene into the reactor through a metering pump, add 5wt% ferrous sulfide and 0.5wt% 2-chloro-phenyl methyl sulfide to the kettle, and adopt secondary absorption for tail gas absorption: primary water Absorption, secondary alkali absorption. Chlorine flow rate is 5m 3 / h, control reaction temperature 15~30℃, reaction pressure -0.002MPa, react for 10h, pass chlorine gas for about 50m 3 When the temperature rises to 50-60°C, continue to pass chlorine gas, and stop the reaction when the basic reaction of monochlorine is complete. The ratio of 2,5-dichloro to 2,6-dichloro in the chlorinated solution is 8.9, and the utilization rate of chlorine gas is 98.5%.
Embodiment 2
[0043] Two-stage tank type reactor in series, each tank has an effective reaction volume of 30L, and the total effective reaction volume is 60L. Add 1kg ferrous sulfide respectively in the first-level and second-level kettles, and enter the p-xylene containing 2-chloro-phenyl methyl sulfide (auxiliary dose is 0.5wt% of p-xylene) to the first-level reactor by metering pump , the feed flow rate is 8L / h, and the chlorine gas flow rate in the primary and secondary kettles is 1.5m respectively 3 / h, 1m 3 / h, control the reaction temperature of the primary and secondary kettles to be 20-30°C and 50-60°C respectively. The reaction solution overflows from the top of the first-stage reactor to the second-stage reactor, and the reaction residence time is about 8 hours. The ratio of 2,5-dichloro to 2,6-dichloro in the chlorinated solution is 8.61, and the utilization rate of chlorine gas is 98%.
Embodiment 3
[0045] Three-stage tank-type series reactor, the effective reaction volume of each tank is 30L, and the total effective reaction volume is 90L. Add 1kg of ferrous sulfide respectively in the first-level, second-level and third-level kettles, and enter the p-xylene containing 2-chloro-phenyl methyl sulfide into the first-level reaction kettle by metering pump (the auxiliary dose is 0.5% of p-xylene). wt%), the feed flow rate is 8L / h, and the chlorine gas flow rate in the primary, secondary, and tertiary kettles is respectively 1.5m 3 / h, 1m 3 / h, 1m 3 / h, control the reaction temperatures of the primary, secondary, and tertiary kettles to be 15-20°C, 40-50°C, and 55-65°C, respectively. The reaction solution overflows from the top of the first-stage reactor to the next-stage reactor in sequence, and the reaction residence time is about 11 hours. The ratio of 2,5-dichloro to 2,6-dichloro in the chlorinated liquid is 10.5, and the utilization rate of chlorine gas is 99.5%.
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