Zinc dithionite

Structural formula
General
Surname	Zinc dithionite
other names	Zinc hydrosulfite
Molecular formula	ZnS 2 O 4
Brief description	White dust
External identifiers / databases
CAS number 7779-86-4 EC number 231-942-2 ECHA InfoCard 100,029,038 PubChem 24517 Wikidata Q204717
properties
Molar mass	193.45 g mol −1
Physical state	firmly
solubility	soluble in water
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Zinc dithionite (chemical formula ZnS ₂ O ₄ ) is produced from sulfur dioxide or hydrogen sulfites through reduction with zinc .

Extraction and presentation

It is produced by introducing sulfur dioxide into a mixture of water and zinc dust.

${\displaystyle \mathrm {Zn+2\ SO_{2}\rightarrow ZnS_{2}O_{4}} }$

or

${\displaystyle \mathrm {Zn+2\ H_{2}SO_{3}\rightarrow ZnS_{2}O_{4}+2\ H_{2}O} }$

use

Zinc dithionite is used as a bleaching agent in the textile and paper industry. Contact with oxygen must be avoided, as it is oxidized by oxygen and becomes ineffective.

${\displaystyle \mathrm {2\ ZnS_{2}O_{4}+2\ O_{2}+2\ H_{2}O\rightarrow Zn(HSO_{4})_{2}+Zn(HSO_{3})_{2}} }$

For ecological reasons (no pollution of the sewage with zinc salts) it is increased u. a. replaced by sodium dithionite .

Individual evidence

1. ↑ data sheet .
2. ↑ data sheet at NOAA (English) .
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
4. ^ Martin BB Hocking: Handbook of Chemical Technology and Pollution Control, 3rd Edition. Academic Press, 2006, ISBN 978-0-080-47827-2 , p. 485 ( limited preview in Google Book Search).
5. ↑ G. Brauer (Ed.), Handbook of Preparative Inorganic Chemistry . 2nd ed., Vol. 1, Academic Press 1963, pp. 394-395.
6. ↑ bleach (peroxygen chemicals) .

Web links

• Modification of zinc hydrosulfite crystals by use of high molecular weight colloidal materials (Rogers, Thomas E., Publication Date: 07/27/1965, freepatentsonline)
• Kinetics of Zinc Hydrosulfite Slurry Reaction (PDF; 363 kB)