AMMONIUM SULFATE CAS N°: 7783-20-2

OECD SIDS
AMMONIUM SULFATE
1. GENERAL INFORMATION ID: 7783-20-2
DATE: 18.04.2006
Type:
use
Remark:
Ammonium sulfate is used predominantly as a fertilizer. As a
fertilizer, (NH4)2SO4 has the advantage of adding sulfur to
the soil as well as nitrogen, as it contains 21 % by weight
nitrogen and 24 % by weight sulfur.
Ammonium sulfate is also used in electric dry cell batteries,
as a soldering liquid, as a fire retardant for fabrics and
other products and as a source of certain ammonium chemicals.
Other uses include water treatment, fermentation processes,
fireproofing agents and leather tanning.
Flag:
non confidential, Critical study for SIDS endpoint
26-MAY-2003 (5)
Type:
use
Remark:
batteries-, photo- and glass-industry
Flag:
non confidential, Critical study for SIDS endpoint
11-MAY-2004 (6)
1.7.1 Detailed Use Pattern
1.7.2 Methods of Manufacture
Orig. of Subst.: Synthesis
Type:
Production
Remark:
Flag:
Large-scale industrial processes (of caprolactam) are,
without exception, multistage processes in which ammonium
sulfate and sometimes organic compounds are formed as
byproducts.
non confidential, Critical study for SIDS endpoint
04-APR-2002 (6)
Orig. of Subst.: Synthesis
Type:
Production
Remark:
Ammonium sulfate was originally manufactured by using
sulphuric acid to scrub by-product ammonia from coke-oven gas,
and much is still produced in this manner.
Most of the ammonium sulfate produced is now made by reaction
between synthetic ammonia and sulfuric acid.
2NH3 + H2SO4 -> (NH4)2SO4
Where sulfur for sulfuric acid is at a premium, a process
based on gypsum and carbon dioxide from combustion can be
used:
(NH4)2CO3 + CaSO4*2H2O -> CaCO3 + 2H2O + (NH4)2SO4
Water is removed by evaporation, and the product is
crystallized to large, white uniform crystals.
Anhydride (CaSO4) can also be used in this process.
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