Catalyst regeneration system suitable for hydrogenation reaction for preparing ethylene glycol from synthesis gas

Abstract

The invention relates to a catalyst regeneration system suitable for hydrogenation reaction for preparing ethylene glycol from synthesis gas. The catalyst regeneration system comprises a carbonylation unit and a hydrogenation unit, wherein the hydrogenation unit comprises a hydrogenation recycle compressor, a hydrogenation heater, a hydrogenation reactor, a hydrogenation cooler and a hydrogenation separator which are sequentially connected through pipelines to form a closed-loop process system; the catalyst regeneration system also comprises a regeneration tank; inlets of the regeneration tank are respectively connected with the dimethyl oxalate discharging end of the carbonylation unit through a first valve and connected with the methanol discharging end of the carbonylation unit through a second valve; an outlet of the regeneration tank is connected with an inlet of the hydrogenation heater through a pressurizing pump. The catalyst regeneration system has the advantages that the great change on the existing process production line is not needed; the installation and the modification are convenient; the activity of hydrogenation reaction catalysts can be effectively improved; the service life of the catalysts is prolonged; the cost for frequently replacing the catalysts after the catalyst deactivation is reduced; the production efficiency is improved.

Description

technical field [0001] The invention relates to a production line for producing ethylene glycol from synthesis gas, in particular to a system capable of regenerating the activity of a hydrogenation reaction catalyst. Background technique [0002] Syngas to ethylene glycol process route is divided into four steps to complete, the first step is esterification reaction, the second step is carbonylation reaction, the third step is hydrogenation reaction, the fourth step is refining; carbonylation reaction and carbonylation reaction The hydrogen reaction is completed in the corresponding carbonylation unit and hydrogenation unit respectively. The main steps of the carbonylation reaction are as follows: combine NO with O from outside the boundary 2 Oxidation reaction occurs together in the pre-reactor to generate N 2 o 3 ; produced N 2 o 3 Esterification reaction with methanol in the reactive distillation column produces methyl nitrite and water (due to the NO in the reactive ...

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Problems solved by technology

[0004] Because in the above-mentioned hydrogenation reaction process, raw material is the hydrogen of 99% and the dimethyl oxalate of 98%, the mol ratio of process requirement hydrogen and dimethyl oxalate is: 60-80%; But in actual production process, due to operation Reasons and load fluctuations will cause excessive dimethyl oxalate, and the excess dimethyl oxalate cannot be completely reacted by the catalyst, which will cause dimethyl oxalate to accumulate on the surface of the catalyst, which will reduce the activity of the catalyst, and excessive accumulation will cause catalyst deactivation ;Even if there is no excess amount of dimethyl oxalate, it will also cause dimethyl oxalate to accumulate on the surface of the hydrogenation catalyst after a long period of operation, reducing the activity of the catalyst

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