Continuous feeding device of nitrite gas

Abstract

The invention discloses a continuous feeding device of nitrite gas. The device comprises a nitrite gas preparing system, a purifying system and a storage and feeding system. The gas generated after charging raw material to the nitrite gas preparing system once is stored in a storage tank to be used by a micro catalytic evaluation device after being purified by the purifying system. After the raw material is used up, a pipeline between the preparing system and the storage tank is closed. At the moment, the gas in the storage tank can be continuously used by the micro catalytic evaluation device. The nitrite gas can be prepared again by using the preparing system; and the pipeline between the preparing system and the storage tank is opened to continuously feed the nitrite gas while the pressure of the generated gas rises to a certain value. By using the continuous feeding device of nitrite gas, disclosed by the invention, the problem that the service life of the catalyst for the reaction of preparing oxalate through CO (Carbon Monoxide) gaseous phase carbonylation is unable to test due to incapability of continuously feeding the nitrite gas in the lab is solved.

Description

technical field [0001] The invention relates to a gas preparation, storage and continuous supply device, in particular to a nitrite gas continuous supply device. Background technique [0002] Ethylene glycol is an extremely important and strategic bulk chemical raw material. At present, it is mainly synthesized by petroleum routes. The actual annual production capacity is very limited, the contradiction between supply and demand is very prominent, and a large amount of reliance is placed on imports. my country is a country rich in coal and low in oil, so the development of coal-based ethylene glycol is of great significance to effectively alleviate the contradiction between supply and demand of ethylene glycol and improve the level of efficient and clean conversion and utilization of coal resources. The reaction of CO and nitrite to generate oxalate is a key step in the conversion of inorganic CO to organic oxalate in coal-to-ethylene glycol. In industry, nitrite is regener...

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Problems solved by technology

In industry, nitrite is regenerated through a reaction cycle, and there is no continuous supply of nitrite gas. However, in laboratory tests, nitrite is consumable. To examine the life of the catalyst, it is necessary to continuously supply nitrite. However, the pressure of the mixed gas of nitrite and CO in steel cylinders currently available on the market is less than 1Mpa (note: when the pressure is greater than 1Mpa, the nitrite gas will be liquefied and the ratio of the mixed gas will be inaccurate), and it will be consumed soon. , it is difficult to examine the catalyst life

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