Device and method for preparing ethylene glycol through dimethyl oxalate hydrogenation

Abstract

The invention discloses a device and method for preparing ethylene glycol through dimethyl oxalate hydrogenation. The device is composed of a gas feeding system, a liquid feeding system, a preheatingfiltration system, a reaction system and a condensation separation system. The gas feeding system comprises a fresh hydrogen compressor, a recycle hydrogen compressor, a flow adjusting valve and a flow transmitter; the liquid feeding system comprises a dimethyl oxalate feeding tank and a metering pump; the preheating filtration system mainly comprises a feeding heat exchanger and a precision filter; the reaction system comprises a tubular reactor and a steam pocket; the condensation separation system comprises a product cooler and a gas-liquid separation tank. Accordingly, full utilization ofheat energy and hydrogen recycling are achieved, the system temperature, pressure, flow and liquid level are all automatically controlled, the tubular reactor is adopted, in the shell side, high pressure hot water coming from the steam pocket passes, reaction heat is absorbed to become high pressure steam, by adjusting the steam pressure, the reaction temperature can be strictly controlled, the reaction heat is effectively removed in time, the product stability is improved, and the service life of a catalyst is prolonged.

Description

technical field [0001] The invention relates to a device and a method for producing ethylene glycol by hydrogenation of dimethyl oxalate. Background technique [0002] Ethylene glycol (EG) is an important organic chemical raw material, from which more than 100 chemical products and chemicals can be derived, and its main uses are the production of polyester monomers and antifreeze. Although my country's ethylene glycol production capacity and output have grown rapidly, it still cannot meet the growing market demand for domestic polyester and other products. It has to be imported in large quantities every year, and the import volume is increasing year by year. [0003] Under this situation, in addition to considering the use of advanced technology to tap the potential of existing ethylene glycol production plants, relevant domestic enterprises should expand the production scale of the plant and increase the output; rely solely on the introduction of foreign advanced technology...

AI Technical Summary

Problems solved by technology

The hydrogenation of dimethyl oxalate is an exothermic reaction, and the use of a fixed-bed reactor has the following disadvantages in actual production: (1) the released heat cannot be well removed from the reactor to produce a runaway temperature; (2) the reaction product is seriously affected (3) Seriously affect the service life of the catalyst, shortening the regeneration period of the catalyst

The use of a fluidized bed reactor has the following disadvantages in actual production: (1) the catalyst entrained in the reaction product; (2) the catalyst entrained in the reaction product needs to be separated, which increases the investment cost of the equipment; (3) fluidization The catalyst in the bed is moving, and the movement will cause the catalyst to be broken, while the powder catalyst is not easy to separate from the reaction product, and the catalyst loss is large

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