A recovery process of by-products from synthesis gas to ethylene glycol
A by-product, ethylene glycol technology, applied in the field of coal chemical industry, can solve the problems of unseen by-product recovery, increase energy consumption, etc., and achieve the effects of being conducive to environmental protection, reducing raw material costs, and shortening the process.
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Embodiment 1
[0028] The specific steps of the by-product recovery process of synthesis gas to ethylene glycol in this embodiment are:
[0029] In the first step, the mass percent of ethylene glycol in the crude product 1 of ethylene glycol produced from syngas is 45%, the mass percent of methanol is 51%, the mass percent of ethanol is 0.5%, the mass percent of water is 1%, ethanol Acetate methyl ester 0.5%, impurity 2%, this ethylene glycol crude product 1 enters the middle part of 1# methanol recovery tower 11, 1# methanol recovery tower 11 top is condensed and produced a small amount of non-condensable gas 3, recovers in 1# methanol The by-product methanol 2 is recovered from the side line of the tower 11, and the by-product methanol with a purity greater than or equal to 99.5% is recovered in this step (the purity refers to the mass fraction of methanol in the recovered methanol solution), and the recovered by-product methanol can be used as a raw material for the preparation of the synt...
Embodiment 2
[0041] The recovery process of the present embodiment is the same as that of the embodiment 1, and the content of each component of the ethylene glycol crude product 1 is the same as that of the embodiment 1, except that the concrete parameters of each tower are different in the present embodiment.
[0042] In this embodiment, the diameter of 1# methanol recovery tower 11 is 60 mm, with a total of 40 theoretical plates, operated under reduced pressure, the liquid feed position is at the 23rd theoretical plate, the reflux ratio R=2, the liquid feed temperature is 65° C. The temperature is 50°C, the temperature of the tower kettle is 67.8°C, and the reflux temperature is 59.5°C. The recovery rate of the by-product methanol extracted from the 1# methanol recovery tower 11 is: the quality of methanol recovered by the 1# methanol recovery tower / the quality of methanol in the crude ethylene glycol product=39%.
[0043] The diameter of the degreasing tower 12 is 250 mm, and there are...
Embodiment 3
[0049] The recovery process of this embodiment is the same as that of Example 1, except that the specific parameters of each tower in this embodiment are different, and the content of each main component of the ethylene glycol crude product 1 is that the mass percent of ethylene glycol is 56 %, the mass percentage of methanol is 40%, the mass percentage of ethanol is 0.5%, the mass percentage of water is 1%, methyl glycolate is 0.5%, and impurities are 2%.
[0050]In this embodiment, the diameter of 1# methanol recovery tower 11 is 80mm, with 40 theoretical plates in total, operated under normal pressure, the liquid feed position is at the 25th theoretical plate, the reflux ratio R=2, the liquid feed temperature is 65°C, and the tower top The temperature is 56°C, the temperature of the tower kettle is 90°C, and the reflux temperature is 60°C. The recovery rate of the by-product methanol extracted from the 1# methanol recovery tower 11 is: the mass of methanol recovered by the ...
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