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 the rare absorption liquid in the epoxy ethane absorption tower including epoxy ethane desorption tower, epoxy ethane absorption tower, refrigerating engine and rare absorption liquid cooler, wherein the refrigerating engine and rare absorption liquid cooler are orderly arranged between epoxy ethane desorption tower and the epoxy ethane absorption tower, additionally, including rare absorption liquid back cooler and low temperature water circuit, wherein the rare absorption liquid back cooler is located downstream of the rare absorption liquid cooler and upstream of the epoxy ethane absorption tower and located together with the refrigerating engine in the low temperature water circuit. The inventive operation solves the problem of higher EO content in the top tower gas phase output which is generated by EO inadequate absorption produced by the higher temperature. Rare absorption liquid feed temperature is controlled at 25-33 DEG C and the EO content in the EO top absorption tower gas is controlled <= 100ppm molar rate. The invention is mainly suitable for the Shell company technology or the epoxy ethane/glycol device similar to.

Description

Technical field [0001] The invention relates to a synthetic 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, Shell’s ethylene oxide / ethylene glycol (EO / EG) process equipment used in China generally has the following problems: the absorption effect of the ethylene oxide absorption tower is not good, and the EO absorption is incomplete, which leads to the gas phase at the top of the tower. The EO content in the output is relatively high (>100ppm molar ratio). Incomplete EO absorption not only increases the loss of products, but the excessively high concentration of gas phase EO returns to the EO reactor with the circulating gas, which will reduce the explosive limit of the reaction gas mixture, affect the operation safety of the device, and is also detrimental to the selectivity of the reaction. [0003] The main reason for the incomplete ...

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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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