Preparation method and preparation system of ethylene glycol (OD) 2
A preparation system and ethylene glycol technology, applied in the field of preparation of ethylene glycol 2, can solve the problems of harsh reaction conditions, expensive catalysts, complicated processes, etc., and achieve the effects of improving conversion rate, low cost, simple and controllable process
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[0042] Ethylene glycol (OD) of the present invention The first embodiment of the preparation method comprises the following steps:
[0043] (1) Reacting the mixture containing heavy water and ethylene glycol at 100-300° C. under normal pressure for 1-8 hours to generate a first reaction solution containing ethylene glycol (OD) 2 .
[0044] Among them, the reaction temperature is preferably 100-150° C., and the reaction time is preferably 3-5 h.
[0045] The mixture is composed of heavy water with concentration≥99.8% and ethylene glycol with concentration≥99.5%, and the volume ratio of ethylene glycol and heavy water is (1-10):1, preferably (1-3):1.
[0046] (2) Carry out rectification to the first reaction liquid, collect the non-vaporized phase in the first reaction liquid, promptly obtain containing ethylene glycol (OD) 2 The second reaction liquid; Simultaneously, collect the gasified phase An adsorbent is used to absorb the residual ethylene glycol and ethylene glycol (OD...
Embodiment 1
[0072] In the mixer 100 , 1.5 liters of ethylene glycol and 1.5 liters of heavy water (the volume ratio of ethylene glycol and heavy water is 1:1) were pre-mixed first, and the mixture obtained after mixing evenly was input into the reaction tower 200 . The mixture in the reaction tower 200 was reacted at 100° C. to 150° C. under normal pressure for 4 hours to obtain a first reaction liquid. The first reaction liquid enters the primary rectification tower 310 with a top temperature of 40°C to 50°C and continues to rectify for 10 hours to collect the ungasified phase to obtain the second reaction liquid, collect the gasified phase and use activated carbon Adsorption of residual ethylene glycol and ethylene glycol (OD)2 yields dilute heavy water. The second reaction solution was distilled under reduced pressure in a distillation tower 400 with a top temperature of 90-110° C. to obtain 1.2 kg of ethylene glycol (OD) 2 product, and the purity of ethylene glycol (OD) 2 in the produ...
Embodiment 2
[0074] In the mixer 100 , 1.5 liters of ethylene glycol and 4.5 liters of heavy water (the volume ratio of ethylene glycol and heavy water is 1:3) were pre-mixed first, and the mixture obtained after mixing evenly was input into the reaction tower 200 . The mixture in the reaction tower 200 was reacted at 100° C. to 150° C. under normal pressure for 4 hours to obtain a first reaction liquid. The first reaction liquid enters the primary rectification tower 310 with a top temperature of 40°C to 50°C and continues to rectify for 10 hours to collect the ungasified phase to obtain the second reaction liquid, collect the gasified phase and use activated carbon Adsorption of residual ethylene glycol and ethylene glycol (OD)2 yields dilute heavy water. The second reaction solution was distilled under reduced pressure in a distillation tower 400 with a top temperature of 90-110° C. to obtain 1.8 kg of ethylene glycol (OD) 2 product, and the purity of ethylene glycol (OD) 2 in the produ...
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