Method for producing hydrogen chloride

Patent metadata

Field	Value
Publication number	US-10611636-B2
Application number	US-201615745825-A
Country	US
Kind code	B2
Filing date	Jul 25, 2016
Priority date	Aug 10, 2015
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

Provided is a method for producing a hydrogen chloride that is capable of efficiently producing a hydrogen chloride with a simple facility. The hydrogen chloride is produced by a method including causing an inert gas to be in gas-liquid contact with a hydrochloric acid in which a concentration is 20 mass % to 50 mass %, distilling the hydrochloric acid with which the inert gas is in gas-liquid contact in the gas-liquid contact and separating a hydrogen chloride from the hydrochloric acid to obtain a crude hydrogen chloride, dehydrating the crude hydrogen chloride obtained in the separating, and compressing and liquefying the dehydrated crude hydrogen chloride obtained in the dehydrating, and purifying the liquid crude hydrogen chloride by distillation.

First claim

The invention claimed is:

1. A method for producing a hydrogen chloride comprising:
causing an inert gas to be in gas-liquid contact with a hydrochloric acid in which a concentration of hydrogen chloride is 20 mass % to 50 mass % to obtain a hydrochloric acid that has been contacted with inert gas;
distilling the hydrochloric acid that has been contacted with inert gas and separating a hydrogen chloride from the hydrochloric acid to obtain a crude hydrogen chloride;
dehydrating the crude hydrogen chloride to obtain a dehydrated crude hydrogen chloride;
compressing and liquefying the dehydrated crude hydrogen chloride to obtain a liquid crude hydrogen chloride; and
purifying the liquid crude hydrogen chloride by distillation.

2. The method for producing a hydrogen chloride according to claim 1 , wherein in the gas-liquid contact, the inert gas comes in gas-liquid contact with the hydrochloric acid, by causing the inert gas to be in contact with the hydrochloric acid of a flow rate in which a linear velocity is 0.1 m/h to 15 m/h and a space velocity is 0.1/h to 10/h in a counter-current flow manner, and a ratio of a volume flow rate of the inert gas to a volume flow rate of the hydrochloric acid is 0.01 to 100.

Assignees

• Showa Denko Kk

Inventors

• Tanimoto Yosuke

Classifications

• C01B7/07

  Purification {; Separation (C01B7/015 takes precedence)} · CPC title

• C01P2006/80

  Compositional purity · CPC title

• C01B7/0712 Primary

  by distillation · CPC title

• B01D3/36

  Azeotropic distillation · CPC title