Device and method for transferring refined ethylene oxide through ethylene glycol

Abstract

The invention discloses a device and a method for transferring refined ethylene oxide through ethylene glycol. The device comprises a refining tower and a tower kettle reboiler, wherein the top of the refining tower is sequentially connected with a condenser, a copious cooler and a backflow tank and then is divided into a pipeline (a) and a pipeline (b); the pipeline (a) is connected with the top of the refining tower; the refining tower is provided with side aldehyde discharging lines; the tower kettle reboiler is installed in an immersed manner and adopts steam heating; a refining tower kettle is provided with a kettle liquid cooler; after an outlet of the refining tower kettle is connected with the kettle liquid cooler, materials are combined with materials in the side aldehyde discharging lines, are combined with materials in the pipeline (b), and are delivered to an ethylene glycol production system. The method comprises the following steps of: discharging aldehyde-containing ethylene oxide through the side aldehyde discharging lines; cooling part of materials in the refining tower kettle, combining the materials with the materials in the aldehyde-containing ethylene oxide and the pipeline (b), and delivering the materials to the ethylene glycol production system. According to the device and the method, the yield of ethylene oxide products with great benefits can be greatly improved, the operation flexibility of the device is improved, and the productivity of ethylene oxide and ethylene glycol products is adjusted.

Description

technical field [0001] The invention relates to the field of ethylene glycol / ethylene oxide production in petrochemical industry, and furthermore, relates to a device and method for converting ethylene glycol into refined ethylene oxide. Background technique [0002] At present, the proportion of refined EO products in EO / EG plants put into production in China is generally between 30-60% of the EO production capacity of the reactor, and the rest of EO is used for hydration to produce ethylene glycol. In this technology, the feed to the EO refining tower comes from the light-removing tower at the front, and the EO concentration of the feed is generally about 60wt%. The side line is taken out, and the top gas phase is condensed by a heat exchanger, and most of it is used as the reflux of the tower, and a small part is discharged to the rear ethylene glycol section for the removal of light components. The EO concentration in the tower bottom is generally controlled at about 50...

AI Technical Summary

Problems solved by technology

[0004] The main problem in the capacity expansion of the EO refining part is: due to the characteristics of its process route, under the premise of a certain EO production capacity of the reactor, it is impossible to directly increase the production of refined EO directly through the existing EO refining tower design. This is because While increasing the output of refined EO products, the concentration of EO in the tower tank decreases and the temperature rises, which leads to the formation of azeotrope between aldehyde impurities and water, which can no longer stay in the tower tank and affect the Refined EO product quality, according to national standard requirements, the total aldehyde content in refined EO products needs to be less than 30ppm

In addition, the scheme of heating with process hot water itself also limits the reduction of EO concentration in the tower kettle.

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