Method for synthesizing ethylbenzene
A synthesis method and technology of ethylbenzene, applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of low investment and operating costs, low ethanol raw materials, low ethanol utilization rate, large energy consumption, etc. , to achieve the effect of low operating cost, simple process, and large-scale solution
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Embodiment 1
[0020] A 30,000 tons / year ethanol and benzene one-step synthesis of ethylbenzene device, using the figure 1 In the ethylbenzene synthesis technology shown, raw material ethanol with a purity of 95% is heated and gasified, mixed with raw material benzene and recycled benzene after gasification heating, and enters an alkylation reactor equipped with a ZSM-5 nano-scale molecular sieve catalyst, and benzene and The molar ratio of ethanol is 6:1, the inlet temperature of the alkylation reactor is 380°C, the pressure is 1.2MPaG, and the weight space velocity of ethanol is 1.5 hours -1, after the reaction, the discharge temperature is 400°C, wherein the weight percentage of ethylbenzene is 16%, and diethylbenzene is 1.6%. ℃, reflux ratio 1 using 45 floating valve trays, after the overhead flow is condensed by the benzene tower top condenser, the water is separated, and the water content in the benzene after the water separation is 0.1%, and part of it is recycled back to the alkylati...
Embodiment 2
[0023] A 30,000-ton / year ethanol and benzene one-step synthesis of ethylbenzene device, the molar ratio of benzene and ethanol in the alkylation reactor is 5:1, other process flow and operating parameters are the same as in Example 1, the outlet of the alkylation reactor Ethylbenzene weight percentage is 15% in the material, and diethylbenzene is 2.0%.
[0024] The total raw material cost of the device is 8920 yuan / ton of ethylbenzene, the purity of ethylbenzene is 99.8%, the content of xylene in ethylbenzene is 700ppm, the unit consumption of ethanol is 446 kg / ton of ethylbenzene, and the energy consumption is 920 MJ / ton of ethylbenzene.
Embodiment 3
[0026] A 60,000-ton / year ethanol and benzene one-step ethylbenzene synthesis device, the inlet temperature of the transalkylation reactor is 220°C, the pressure is 3.0MPaG, the weight ratio of benzene and polyethylbenzene is 7:1, and the liquid weight space velocity is 2 hours -1 , the conversion rate of polyethylbenzene was 70%, and other technological processes and operating parameters were the same as in Example 1.
[0027] The total raw material cost of the device is 8870 yuan / ton of ethylbenzene, the purity of ethylbenzene is 99.82%, the content of xylene in ethylbenzene is 650ppm, the unit consumption of ethanol is 442 kg / ton of ethylbenzene, and the energy consumption is 920 MJ / ton of ethylbenzene.
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