Device and technological method for recycling ethanolamine in ammonia, water and ethyl alcohol mixtures

Abstract

The invention relates to methods for recycling ethanolamine, particularly discloses a device and a technological method for recycling ethanolamine in ammonia, water and ethyl alcohol mixtures, and belongs to the technical field of chemical separation. The technological method includes steps of (1), adding the ammonia, water and ethyl alcohol mixtures; (2), carrying out rectification and absorptionto obtain ethanolamine solution; (3), carrying out tail gas absorption technologies. The device and the technological method have the advantages that the technological method includes rectification and absorption continuous operation technologies, a rectification technology and an absorption technology are integrated with each other, accordingly, production technologies can be simplified, and technological processes can be shortened; the qualified ethanolamine solution can be obtained from absorption tanks of ammonia distilling towers and can be absorbed by tail gas absorption towers, accordingly, gas can be emitted in a zero-pollution manner, and the problem of environmental pollution due to emission of a large quantity of ammonia-containing waste gas in the prior art can be solved; ammonia and ethyl alcohol in ammonia-containing wastewater can be sufficiently recycled, accordingly, the production cost can be reduced, and the production efficiency can be improved.

Description

technical field [0001] The invention relates to a method for recovering ammonia ethanol, in particular to a device and a process method for recovering ammonia ethanol from a mixture of ammonia, water and ethanol, belonging to the technical field of chemical separation. Background technique [0002] Ammonia can be used to manufacture ammonia water, nitrogen fertilizer (urea, ammonium bicarbonate, etc.), compound fertilizer, nitric acid, ammonium salt, soda ash, etc. It is widely used in chemical industry, light industry, chemical fertilizer, pharmaceutical, synthetic fiber and other fields. Intermediates, sulfa drugs, polyurethane, polyamide fiber and nitrile rubber all need ammonia as raw material directly. In addition, liquid ammonia is often used as a refrigerant, and ammonia can also be used as a biofuel to provide energy. Ethanol is used in various chemical production It is also widely used. A large amount of ammonia ethanol and ammonia energy are mixed in the ammonia-co...

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Problems solved by technology

[0002] Ammonia can be used to manufacture ammonia water, nitrogen fertilizer (urea, ammonium bicarbonate, etc.), compound fertilizer, nitric acid, ammonium salt, soda ash, etc. It is widely used in chemical industry, light industry, chemical fertilizer, pharmaceutical, synthetic fiber and other fields. Intermediates, sulfa drugs, polyurethane, polyamide fiber and nitrile rubber all need ammonia as raw material directly. In addition, liquid ammonia is often used as a refrigerant, and ammonia can also be used as a biofuel to provide energy. Ethanol is used in various chemical production It is also widely used. A large amount of ammonia ethanol and ammonia energy are mixed in the ammonia-containing wastewater and waste gas produced in the chemical production process. Direct discharge not only pollutes the environment, but also causes a waste of resources. In the prior art, ammonia ethanol recovery process The rectification process and the ammonia absorption process are two separate processes, the production process is long, the cost of production equipment is high, and the recovery efficiency is low

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