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Refining method and device for ammonia

A refining method and technology of a refining device, which are used in the preparation/separation of ammonia, separation methods, chemical instruments and methods, etc., to achieve the effect of improving refining efficiency

Inactive Publication Date: 2007-08-08
NIPPON SANSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When there are many individual refining processes, there is a problem that large-scale refining equipment is required for continuous refining

Method used

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  • Refining method and device for ammonia
  • Refining method and device for ammonia
  • Refining method and device for ammonia

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Embodiment Construction

[0055] Hereinafter, embodiments of the ammonia purification method and purification apparatus of the present invention will be described in detail with reference to the drawings.

[0056] Referring to FIG. 1 , the refining apparatus and refining method for removing low-boiling impurities from crude ammonia according to the present invention will be described. Fig. 1 is a schematic configuration diagram of a refining apparatus according to this embodiment. The raw material ammonia is contained in the liquid ammonia container 1, and the ammonia gas in the gas phase part 12 becomes crude ammonia gas for purification. The raw material ammonia is separated into a liquid phase part 11 and a gas phase part 12 , and since the liquid phase and the gas phase are separated, moisture and metal impurities contained in the raw material ammonia basically remain in the liquid phase part 11 . Therefore, the ammonia in the gas phase part 12 obtained by the separation of the liquid phase and th...

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Abstract

The object of this invention is to provide an ammonia refining method for efficiently removing diversified kinds of non-metallic impurities included in raw material ammonia and simplifying a continuous refining process, and to provide an apparatus therefor. The gaseous ammonia refining apparatus of this invention refines the crude gaseous ammonia containing moisture and low boiling point gaseous impurities having a boiling point lower than that of the ammonia, and is equipped with: a distillation section 3 which consists of a heat exchanger into which the crude gaseous ammonia is introduced to liquefy the gaseous ammonia by using a cooling effect; an exhaust path which is disposed in the distillation section 3 and exhausts the low boiling point gaseous impurities in a gaseous state; a vaporizer which vaporizes the liquefied ammonia discharged from the distillation section 3; moisture adsorption sections 22 and 24 which adsorb the moisture; catalyst sections 23 and 25 which separate oxygen; and a gaseous ammonia introducing path which introduces the gaseous ammonia vaporized by the vaporizer into the moisture adsorption sections 22 and 24 and the catalyst sections 23 and 25.

Description

technical field [0001] The invention relates to a refining method for refining crude ammonia gas containing various impurities, and more specifically, relates to an ammonia refining method and a refining device for providing high-purity ammonia necessary for the semiconductor industry, chemical industry, and research institutes. Background technique [0002] Ammonia is generally used frequently in the semiconductor manufacturing industry and the like, and ammonia refined from raw material ammonia is used at the manufacturing site. Raw ammonia is ammonia synthesized by an ammonia production plant, or recycled ammonia recovered from the site of use, etc. This raw material ammonia contains non-metallic impurities such as water, hydrogen, oxygen, carbon monoxide, carbon dioxide, and methane in addition to metals, and must be refined into high-purity ammonia for use in semiconductor manufacturing and the like. [0003] In the past, various studies have been conducted on the remo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/02C01C1/10B01D53/26B01D1/00B01D5/00C01C1/12
CPCB01D1/00B01D5/00B01D53/26C01C1/024
Inventor 米田隆阪口正美池田晶义安部敏行
Owner NIPPON SANSO CORP
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