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Application Note
Hydrogen Chloride
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Potential industries and applications
for gas detection products
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Hydrogen Chloride production
Chemical manufacturing
Rubber treatment
Metal treatment plants
Cotton treatment
Semiconductor manufacturing
The compound Hydrogen Chloride has the formula HCl.
At room temperature, it is a colourless gas, which forms
white fumes of Hydrochloric Acid upon contact with
atmospheric humidity. Hydrogen Chloride gas, as well
as Hydrochloric Acid, are important in technology and
industry. The formula HCl is often used to refer, somewhat
misleadingly, to Hydrochloric Acid, an aqueous solution
derived from Hydrogen Chloride.
Hydrogen Chloride forms corrosive Hydrochloric Acid on
contact with water found in body tissue. Inhalation of the
fumes can cause coughing, choking, inflammation of the
nose, throat, and upper respiratory tract, and in severe
cases, pulmonary edema, circulatory system failure, and
death. Skin contact can cause redness, pain, and severe
skin burns. Hydrogen Chloride may cause severe burns to
the eye and permanent eye damage.
Hydrogen Chloride
General
Systematic Name
Hydrogen Chloride
Chlorane
Other Names
Chlorohydric Acid
Hydrochloride
Hydrochloric Acid
Hydrochloric Acid gas
Molecular Formula
HCl
Appearance
Colourless gas,
CAS Number
hygroscopic
7647-01-0
Properties
Vapour Density
Melting Point
1.3
-114.2°C (158.8K)
Boiling Point
-85.1°C (187.9K)
Industrial Applications
Historical uses of Hydrogen Chloride in the
20th century include hydrochlorinations
of alkynes in producing the chlorinated
monomers Chloroprene and Vinyl Chloride,
which are subsequently polymerised to
make Polychloroprene (Neoprene) and
Polyvinyl Chloride (PVC), respectively.
In the production of Vinyl Chloride,
Acetylene (C2H2) is Hydrochlorinated by
adding the HCl across the triple bond of
the C2H2 molecule, turning the triple into a
double bond, yielding Vinyl Chloride.
EH 40 Workplace Exposure Limit (WEL)
Short-term exposure limit
(8-hour TWA reference
(15-minute TWA reference
period)
period)
ppm mg.m ppm mg.m-3
1
2
5
8
Most Hydrogen Chloride is used in
the production of Hydrochloric Acid.
Hydrochlorination of rubber
Production of Vinyl and Alkyl Chlorides
Chemical intermediate in other
chemical production
Use as babbitting flux
Treatment of cotton (delinting and
separation from wool)
Used in semiconductor industry
(in pure grade)
- Etching semiconductor crystals
- Converting Silicon to SiHCl3 for
purification of Silicon
Hydrogen Chloride usually comes in
compressed gas cylinders that are either red
and brown or grey with a yellow band.
Toxic Exposure Levels
Long-term exposure limit
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-3
OSHA Permissible Exposure Limit (PEL)
Honeywell Analytics’ product offering
Long-term exposure limit (8-hour TWA reference period)
ppm mg.m-3
5 (ceiling)
7 (ceiling)
ACGIH Threshold Limit Value
8-hour TWA workday and a 40-hour workweek
2ppm (ceiling)
Series 3000 XPIS
Apex
Midas®
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USA
Tel: +1 847 955 8200
Toll free: +1 800 538 0363
Fax: +1 847 955 8208
[email protected]
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Americas
Asia Pacific
Honeywell Analytics
Technical
ServicesInc.
Honeywell Analytics Asia Pacific
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Barclay
Blvd.
[email protected]
#508, Kolon Science Valley (1)
Lincolnshire, IL 60069
187-10 Guro-Dong, Guro-Gu
USA
www.honeywell.com
Seoul, 152-050,
Tel: +1 847 955 8200
Korea
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While every effort has been made to ensure accuracy in this publication, no responsibility can be accepted for errors or omissions.
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Data
may change, as well as legislation, and you are strongly advised to obtain copies of the most recently issued regulations,
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standards, and guidelines. This publication is not intended to form the basis of a contract.
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H_Hydrogen Chloride_GasAppNote_V1_EMEA
Asia Pacific
12/07
Honeywell
Analytics
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2007 Honeywell
AnalyticsAsia Pacific
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