System and method used for preparing glycol via hydrogenation of oxalic ester
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An oxalate and ethylene glycol technology, applied in chemical instruments and methods, hydroxyl compound preparation, sustainable manufacturing/processing, etc., to reduce system energy consumption, avoid heat exchange, and improve reaction yields
Active Publication Date: 2014-05-21
CHINA PETROCHEMICAL CORP +1
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[0005] The hydrogenation of oxalate to ethylene glycol is an important direction of the coal chemical industry. Its production method and proc
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Embodiment 1
[0061] Such as figure 1 As shown, a system for hydrogenating oxalate to ethylene glycol includes: circulating hydrogen compressor 1, inlet and outlet heat exchanger 2, mixer 3, feed guard bed 4, circulating hydrogen heater 5, hydrogenation Reactor 6, raw material preheater 7, reaction product intermediate heat exchanger 8, reaction discharge cooler 9 and gas-liquid separation tank 10;
[0062] The inlet and outlet heat exchanger 2 is sequentially connected to the mixer 3, the feed guard bed 4 and the circulating hydrogen heater 5, the raw material preheater 7 is connected to the mixer 3; the outlet of the circulating hydrogen heater 5 is connected to the inlet of the hydrogenation reactor 6, and the hydrogen gas enters The material 11 enters the hydrogenation reactor 6 through the inlet and outlet heat exchanger 2, the mixer 3, the feed guard bed 4 and the circulating hydrogen heater 5; Material guard bed 4;
[0063] The outlet of the hydrogenation reactor 6 is sequentially ...
Embodiment 2
[0078] The system is the same as in Example 1, the difference is only that the inlet and outlet heat exchanger 2, the mixer 3, the circulating hydrogen heater 5, and the hydrogenation reactor 6 are two in parallel: as figure 2 shown.
[0079] Using oxalate ester hydrogenation catalyst, the catalyst weight space velocity is 0.1~0.5h -1 , The maximum temperature rise of the bed is less than 10°C.
[0080] use as figure 2 Shown flow process, obtain the result of table 2.
[0081] The results show that, adopting the system and method of the present invention to prepare ethylene glycol, the maximum temperature rise of the isothermal reactor bed can be controlled within 10°C, the conversion rate of oxalate is greater than 98%, and the selectivity of ethylene glycol is greater than 90mol%. The heat removal and heat exchange network recovers energy, and the recovered energy is 1.985Mkcal / t ethylene glycol.
[0082] Table 2
[0083]
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Abstract
The invention discloses a system and a method used for preparing glycol via hydrogenation of oxalic ester. The system comprises a recycle hydrogen compressor, a charging and discharging heat exchanger, a mixer, a charging protection bed, a recycle hydrogen heater, a hydrogenation reactor, a raw material preheater, a reaction product intermediate heat exchanger, a reaction discharging cooler, and a gas-liquid separation tank; the charging and discharging heat exchanger is connected with the mixer, the charging protection bed, and the recycle hydrogen heater successively; the raw material preheater is connected with the mixer; an outlet of the recycle hydrogen heater is connected with an inlet of the hydrogenation reactor; an outlet of the hydrogenation reactor is connected with the charging and discharging heat exchanger, the reaction product intermediate heat exchanger, the reaction discharging cooler, and the gas-liquid separation tank successively. The method comprises following steps: hydrogen and oxalic ester are heated, and are mixed so as to realize complete evaporation; and obtained mixture is delivered into the hydrogenation reactor so as to obtain glycol via reaction. The system and the method are capable of ensuring needed reaction conditions effectively, controlling reactor bed layer temperature rise stably, realizing full recovery of energy, reducing energy consumption, and ensuring conversion rate of oxalic ester and selectivity of product glycol.
Description
technical field [0001] The invention relates to the field of ethylene glycol production, and more particularly, to a system and method for hydrogenating oxalate to produce ethylene glycol. Background technique [0002] Ethylene glycol is an important chemical raw material and strategic material, mainly used in the manufacture of synthetic fibers (polyester), polyester, polyester polyol, explosives, glyoxal, etc., and used as antifreeze, plasticizer, hydraulic fluid, surface active agents and solvents. It is widely used in organic synthesis, pharmaceuticals, spices, coatings and other fields. [0003] The traditional ethylene glycol production method in the petrochemical industry is to react gas-phase ethylene with pure oxygen to generate ethylene oxide. After ethylene oxide is separated from the reaction output gas, it is hydrated with water to generate ethylene glycol. In the traditional ethylene glycol production method, the design and manufacture of the oxidation reacto...
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