Device and method for reducing temperature of poor-absorption liquid feed material of Ethylene Oxide absorption tower

Abstract

The invention discloses a device for reducing the feed temperature of lean absorption liquid in an ethylene oxide absorption tower, comprising an ethylene oxide desorption tower, an ethylene oxide absorption tower, a refrigerator and a cooler for lean absorption liquid, the refrigerator and a lean absorption liquid The absorption liquid cooler is sequentially arranged between the ethylene oxide desorption tower and the ethylene oxide absorption tower; in addition, it also includes a lean absorption liquid after-cooler and a low-temperature water circuit, and the lean absorption liquid after-cooler is located in the lean absorption liquid cooler Downstream, before entering the ethylene oxide absorption tower, and on the same low-temperature water circuit as the refrigerator. The invention also discloses a method for reducing the feed temperature of lean absorption liquid in the ethylene oxide absorption tower. The operation of the invention is more economical and safe, without additional energy consumption, and the temperature control is more stable, which completely solves the problem of high EO content in the tower top gas phase output due to incomplete EO absorption caused by high temperature. The feed temperature of the lean absorption liquid can be controlled at 25-33°C, and the EO content in the top gas of the EO absorption tower can be controlled at a molar ratio of ≤100ppm. The present invention is mainly applicable to the technology of Shell company or the ethylene oxide / ethylene glycol device similar to its process flow.

Description

technical field [0001] The invention relates to a synthesis process method of ethylene oxide, in particular to a device and method for cooling the lean absorption liquid of an ethylene oxide absorption tower. Background technique [0002] At present, the following problems generally exist in the ethylene oxide / ethylene glycol (EO / EG) process equipment of Shell Company in China: the absorption effect of the ethylene oxide absorption tower is not good, and the absorption of EO is not complete, which leads to the gas phase at the top of the tower. The EO content in the output is relatively high (>100ppm molar ratio). The incomplete absorption of EO not only increases the loss of products, but also the excessively high concentration of gas phase EO returns to the EO reactor with the circulating gas, which will reduce the explosion limit of the reaction gas mixture, affect the operation safety of the device, and is also detrimental to the selectivity of the reaction. [0003]...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a device that is economical and safe to operate, does not require additional energy consumption, and has a more stable temperature control device that reduces the feed temperature of the lean absorption liquid in the ethylene oxide absorption tower, so that the EO The feed temperature of the lean absorption liquid in the absorption tower drops below 33°C, which completely solves the problem of high EO content in the gas phase output from the top of the tower due to incomplete EO absorption caused by high temperature, and makes energy use more economical and reasonable

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