Producing method and device of high purity ammonia

Abstract

The invention provides a producing method and a device of high purity ammonia. Low purity liquefied ammonia having water of high volatilization point and heavy metals passes through a distillation tower, and the water and heavy metals is discharged from an outlet at one side of a reboiler disposed at the lower part of the distillation tower, And substances of low volatilization point like carbon dioxide, oxygen, nitrogen, hydrogen and others are discharged from an outlet disposed at the upper part. In this case, liquid ammonia of high purity collected at the lower part of the reboiler can be produced in a large amount.

Description

technical field [0001] The present invention relates to a method and device for producing high-purity ammonia. In the high-purity ammonia production method, low-purity ammonia or liquefied ammonia is passed through a plurality of distillation towers to produce high-purity ammonia. The connecting pipe on the reboiler at the lower part of the tower separates and removes water with high volatilization point, heavy metals, etc., and discharges carbon dioxide, oxygen, nitrogen, and hydrogen, etc. Produces 99.999% or more high-purity liquefied ammonia collected in the reboiler at the bottom of the final distillation column. Background technique [0002] As a prior art related to the purification of high-purity ammonia gas, Korean Laid-Open Patent Publication No. 2003-0083689 discloses a method for making low-purity ammonia gas into high-purity gas by using a filter, but frequent replacement is required It is cumbersome to use a filter, and the replacement of the filter will cause...

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Problems solved by technology

[0002] As a prior art related to the purification of high-purity ammonia gas, Korean Laid-Open Patent Publication No. 2003-0083689 discloses a method for making low-purity ammonia gas into high-purity gas by using a filter, but frequent replacement is required It is difficult to mass-produce because it is troublesome to replace the filter, and the replacement of the filter will cause a decrease in productivity.

[0003] In addition, as other prior art, Korean Laid-Open Patent Publication No. 2002-0010110 and No. 2000-0062180 disclose a method for producing high-purity ammonia gas using an adsorbent and a catalyst to remove impurities, using activated carbon, zeolite, Activated alumina, etc. are used as adsorbents, and manganese oxide, etc. are used as catalysts, but there is a problem that it is difficult to replace the adsorbent due to the selection of the adsorption method, and the adsorbent may cause secondary pollution of heavy metals, especially restricting mass production. Therefore, there is a problem that it is difficult to mass-produce high-purity ammonia of 99.999% or more

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