Continuous preparation method of propylene glycol monobutyl ether
A technology of propylene glycol butyl ether and butanol, which is used in ether preparation, chemical instruments and methods, and alkylene oxide preparation of ether, etc. Effect
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Embodiment 1
[0027] First wrap the jacketed Add solid base NH(CH 2 ) 2 NH 2 / MCM-41, the tubular reactor is composed of a three-stage heating tubular furnace, wherein the ratio of the solid base catalyst filling to the inner volume of the tubular reactor is 0.60:1; the raw material butanol and propylene oxide are mixed according to the mass ratio The ratio of 2.55:1 is pumped into the mixer by the metering pump, heated and vaporized by the preheater heating furnace, and enters the tubular reactor for reaction. The mixed gas generated by the reaction enters the collector after being condensed by the condenser, and the output content at the bottom of the collector is ≥62.0 The crude product of propylene glycol butyl ether in wt%; the crude product of propylene glycol butyl ether extracted from the bottom of the collector above 50.0% is added to the side line rectification tower, and after vacuum distillation, the side line discharge of the side line rectification tower has a content ≥ 99....
Embodiment 2
[0041] The pressure of the tubular reactor was changed, and the gas phase catalytic reaction was carried out under the same conditions as step (1) in the embodiment (1). Control the mass ratio of butanol / propylene oxide in the tubular reactor to 2.55:1, the ratio of solid base catalyst filling to the inner volume of the tubular reactor to 0.6:1, and the space velocity ratio to 0.65h -1 , the reaction temperature is 140.5°C, and the influence of pressure on the purity of the crude product of propylene glycol butyl ether and the conversion rate of propylene oxide is shown in figure 2 As shown, when the pressure was at 0.12-0.18MPa, the purity of the crude product of propylene glycol butyl ether and the conversion rate of propylene oxide increased, and when the pressure continued to increase, the purity of the crude product of propylene glycol butyl ether and the conversion rate of propylene oxide decreased to some extent. Its main reason is because propylene glycol butyl ether ...
Embodiment 3
[0043] Change the reaction temperature of tubular reactor, adopt the same condition as step (1) in the embodiment (1) to carry out gas-phase catalytic reaction, control the mass ratio of butanol / propylene oxide in the tubular reactor to be 2.55: 1, catalyst The ratio of the filling amount to the inner volume of the tubular reactor is 0.6:1, and the space velocity ratio is 0.65h -1 , the reaction pressure is 0.18MPa, and the influence of temperature on the crude product purity and propylene oxide conversion rate of propylene glycol butyl ether is shown in image 3 As shown, when the temperature is 120.0-140.5°C, the purity of the crude product of propylene glycol butyl ether and the conversion rate of propylene oxide increase, and when the temperature continues to increase, the purity of the crude product of propylene glycol butyl ether and the conversion rate of propylene oxide decrease. Its main reason is because propylene glycol butyl ether generates derivative product and r...
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Abstract
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