Safety device for regeneration tower for coal-to-ethylene glycol methyl nitrite esterification

Abstract

The invention relates to a methyl nitrite esterification regenerating column safety device for producing glycol from coal, which comprises an esterification regenerating column, a methanol storage tank and an accumulator, wherein the methanol storage tank is arranged at the column top of the esterification regenerating column and is connected with the esterification regenerating column via a connecting pipeline, and the esterification regenerating column is connected with a synthesis recycle gas inlet pipeline, an oxygen inlet pipeline and a gas phase outlet pipeline; the inlet of the methanol storage tank is connected with a methanol inlet pipeline and the outlet thereof is connected with a methanol outlet pipeline, the methanol outlet pipeline is connected to a first stage circulating methanol main pipe and enters the esterification regenerating column via a methanol distributor for spraying, and the methanol inlet pipeline is connected with the methanol distributor via a pipeline; and the accumulator is arranged at the upper end of the methanol storage tank, and the methanol storage tank and the accumulator are connected with valves via pipelines. The invention aims to provide a methyl nitrite esterification regenerating column safety device for producing glycol from coal, which can effectively solve the problem of unusual service conditions due to power outage, steam supply stop and water supply stop, and ensure safe and efficient emergency disposal of the system.

Description

Technical field [0001] The invention relates to the field of ethylene glycol production, in particular to a safety device for coal-to-ethylene glycol, in particular to a safety device for a coal-to-ethylene glycol methyl nitrite esterification regeneration tower. Background technique [0002] The existing coal-to-ethylene glycol technical process mainly adopts the raw material route of carbonylation and hydrogenation to synthesize ethylene glycol. The overall reaction equation is 2CO+4H2+1 / 2O2=(CH2OH)2+H2O; [0003] The first step, the preparation and regeneration of methyl nitrite (MN), the reaction equation is 2CH3OH+2NO+1 / 2O2=2CH3ONO+H2O; [0004] The second step is the synthesis of dimethyl oxalate (DMO). The reaction equation is 2CH3ONO+2CO=(COOCH3)2+2NO; [0005] In the third step, dimethyl oxalate is hydrogenated to produce ethylene glycol, the reaction equation is (COOCH3)2+4H2=(CH2OH)2+2CH3OH; [0006] Among them, the esterification regeneration of methyl nitrite is one of the...

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the shortcomings of the esterification regeneration tower in the above-mentioned prior art that are easily caused by overtemperature, overpressure, and explosion under abnormal working conditions such as interruption of circulating gas and methanol, and provide an effective solution to problems caused by power outages, Stop steam, water and other problems caused by abnormal working conditions and ensure safe and efficient emergency disposal of the system Safety device for coal-to-ethylene glycol methyl nitrite esterification regeneration tower

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