Basic information Description Uses Preparation References Safety Supplier Related
ChemicalBook >  Product Catalog >  Food Additives >  bleach >  Disodium hydrosulfite

Disodium hydrosulfite

Basic information Description Uses Preparation References Safety Supplier Related

Disodium hydrosulfite Basic information

Product Name:
Disodium hydrosulfite
Synonyms:
  • dithionous acid disodium salt
  • HYDROSULFITE
  • SODIUM HYPODISULFITE
  • SODIUM DITHIONITE
  • SODIUM HYDROSULFITE
  • SODIUM HYDROSULPHITE
  • blankit
  • burmol
CAS:
7775-14-6
MF:
Na2O4S2
MW:
174.11
EINECS:
231-890-0
Product Categories:
  • inorganic chemical raw material
  • inorganic salt
  • INORGANIC & ORGANIC CHEMICALS
  • Inorganics
  • sulphite
Mol File:
7775-14-6.mol
More
Less

Disodium hydrosulfite Chemical Properties

Melting point:
300 °C
Boiling point:
1390°C
Density 
2.13
Flash point:
>100°C
storage temp. 
Store at +5°C to +30°C.
solubility 
250 g/L (20°C)
form 
Powder/Solid
color 
White
PH
5.5-8.5 (50g/l, H2O, 20℃)
Water Solubility 
250 g/L (20 ºC)
Sensitive 
Moisture Sensitive
Merck 
14,8626
Stability:
Stable, but air sensitive. Incompatible with strong acids, strong oxidizing agents, water, moisture.
CAS DataBase Reference
7775-14-6(CAS DataBase Reference)
EPA Substance Registry System
Sodium hydrosulfite (7775-14-6)
More
Less

Safety Information

Hazard Codes 
Xn
Risk Statements 
7-22-31
Safety Statements 
26-28-43-7/8-43E-28A
RIDADR 
UN 1384 4.2/PG 2
WGK Germany 
1
1-10
Autoignition Temperature
>200 °C
TSCA 
Yes
HazardClass 
4.2
PackingGroup 
II
HS Code 
28311010
Hazardous Substances Data
7775-14-6(Hazardous Substances Data)
Toxicity
LD50 orally in Rabbit: 2500 mg/kg

MSDS

More
Less

Disodium hydrosulfite Usage And Synthesis

Description

Sodium dithionite is also called sodium hydrosulfite, sodium hydrosulphite, sodium sulfoxylate, and sulfoxylate. Sodium dithionite is not stable under physiological conditions, with the rate of decomposition increasing with increasing acidity. Upon contact with moisture, it is oxidized to hydrogen sulfite (HSO3-), sulfite (SO32-) and hydrogen sulfate (HSO4-). Under strongly acidic conditions it may liberate sulfur dioxide. Under anaerobic conditions (such as in the lower gastrointestinal tract), hydrogen sulfite (HSO3-) and thiosulfate (S2O32-) may be formed. Hydrogen sulfite (HSO3-) can be absorbed after ingestion. It is efficiently metabolized and the major part rapidly is excreted as sulfate into the urine.

Sodium dithionite is widely used in industry owing to its reducing properties and ability to react with oxygen. It is used in textile industry for dyeing, in the pulp and paper industry as a reducing bleach to remove yellow discoloration from cellulose based products, as an oxygen scavenger in boilers, in conservation to remove iron stains on cultural artifacts, and in water treatment for controlling iron flash on white fabrics in bleaching environments.  It is also used in photographic film, clay, wine, leather goods, foods and beverages, polymers, cleaners, gas purification, environmental remediation, metal recovery, and chemical processing.

Uses

Sodium dithionite is a strong reducing agent and is produced commercially for use in vat dyeing.

Preparation

The most convenient production method involves a reaction of a suspension of metallic zinc dust with sulphur dioxide to form zinc dithionite, followed by metathesis with sodium carbonate to form the corresponding sodium dithionite:
Zn+2SO2->ZnS2O4
ZnS204 + Na2CO3 -> Na2S2O4 + ZnCO3

References

[1] http://chemicalsolutions.net/sodium-hydrosulfite.html
[2] http://www.inchem.org/documents/sids/sids/7775146.pdf
[3] Lyndsie Selwyn, Season Tse (2008) The chemistry of sodium dithionite and its use in conservation, 53, 61-73

Chemical Properties

White solid

Uses

Sodium dithionite is a reducing agent for vat dyes,reducing hair bleaching agents,vat dyes printing auxiliaries, silk scouring and bleaching agents, coloring agents and objects stripping vat cleaning agent, particularly in dyeing with indigo and vat dyes; bleaching soaps, straw; removing dyes from dyed fabrics.

Definition

ChEBI: An inorganic sodium salt that is the disodium salt of dithionous acid.

Production Methods

An alternative route for dithionite production is the reduction of sodium bisulfite with sodium borohydride. Sodium borohydride is obtained by reacting boron trimethyl ester, B(OCH3)3, with sodium hydride, NaH. The resulting product is hydrolyzed with water, and methanol is evaporated. An alkaline, aqueous solution is obtained, containing about 12% NaBH4 and 40% NaOH. This solution is commercially available. Reaction to dithionite is made on-site by adding sulfur dioxide and some additional caustic soda. Storages, handling and mixing of sulfur dioxide and of the Borol® liquid are not everywhere cost competitive.
NaBH4+8NaOH+8SO2 → 4Na2S2O4+NaBO2+6H2O.

Preparation

Sodium dithionite is today produced mainly from sodium formate and sulfur dioxide. Zinc dithionite, prepared on-site from sulfur dioxide and zinc dust, was formerly more important than the sodium salt. The heavy metal zinc ended up in the effluent, which caused environmental problems. Today in pulp mills on-site production of zinc dithionite is no longer practiced. The number of plants using sodium amalgam and sulfur dioxide for dithionite production is decreasing with the number of amalgam cells in electrolysis. On-site generation of dithionite from alkaline sodium borohydride solution, sodium bisulfite, and sulfur dioxide is used by some mills.
Sodium dithionite is available as crystalline powder (&90% Na2S2O4) or as a refrigerated 150 g/L solution stabilized with alkali. The white crystals can decompose on heating. Low alkalinity, pH8 to 13, stabilizes dithionite solution at low temperature.
These solutions should be kept well below 10 °C with the exclusion of air. In presence of air, oxidation rapidly yields sulfate and sulfite.
The powder product prepared via the amalgam route dissolves into an alkaline solution as it contains sodium carbonate and sulfite. This can trigger the precipitation of calcium carbonate (water hardness) in the solution tank. Therefore, it is recommended to add small amounts of chelants during the dissolution step. (Chelants are not required to stabilize the bleaching reaction.) Sodium dithionite prepared by the formate route dissolves into a slightly acidic solution. Dithionite powder can ignite if exposed to high humidity or elevated temperature.

General Description

Sodium dithionite is a whitish to light yellow crystalline solid having a sulfur dioxide-like odor. Sodium dithionite spontaneously heats on contact with air and moisture. This heat may be sufficient to ignite surrounding combustible materials. Sodium dithionite is soluble in water. Under prolonged exposure to fire or intense heat containers of Sodium dithionite may violently rupture. Sodium dithionite is used in dyeing and to bleach paper pulp.

Reactivity Profile

Inorganic reducing agents, such as Sodium dithionite, react with oxidizing agents to generate heat and products that may be flammable, combustible, or otherwise reactive. Their reactions with oxidizing agents may be violent. Sulfites and hydrosulfites (dithionites) can react explosively with strong oxidizing agents (sodium chlorite). Sulfites generate gaseous sulfur dioxide in contact with oxidizing acids and nonoxidizing acids.

Hazard

Fire risk in contact with moisture. To extin- guish fires, flood the reacting mass with water.

Health Hazard

Fire will produce irritating, corrosive and/or toxic gases. Inhalation of decomposition products may cause severe injury or death. Contact with substance may cause severe burns to skin and eyes. Runoff from fire control may cause pollution.

Fire Hazard

Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.

Safety Profile

Toxic and an irritant. An allergen. Flammable when exposed to heat or flame. Ignites on contact with water or sodium chlorite. To extinpsh fires, flood the reacting mass with water. Decomposes violently when heated to 19OOC and emits toxic fumes of SOx and NazO

storage

Sodium dithionite crystals are available in steel containers (1 or 2 tons) or in steel drums (200 kg). Because of the danger of spontaneous ignition in humid air, sodium dithionite must be stored under dry and cool conditions. The sites for the preparation of dithionite solutions must permit handling without risks, high humidity should be avoided and remote fire control should be available.
Commercial dithionite products are classified as self-igniting hazardous goods (Class 4.2, UN 1384). Local rules for transportation and storage must be obeyed.

Properties and Applications

INDEX/GRADE

SH-90

SH-88

SH-85

CONTENT

90%

88%

85%

Na 2 S 2 O 4

≥90%

≥88%

≥85%

Fe

≤20ppm

≤20ppm

≤20ppm

Zinc (Zn)

≤1ppm

≤1ppm

≤1ppm

Other heavy metal

(calculated as Pb)

≤1ppm

≤1ppm

≤1ppm

Water Insolubles

≤0.05%

≤0.05%

≤0.05%

Shelf Life(month)

12

12

12

Disodium hydrosulfiteSupplier

Wujiang city li li dongyang auxiliaries factory Gold
Tel
0512-63619531
Email
352684009@qq.com
Sino Chem Mongolia Alliance Ltd. Gold
Email
wangnicholas@hotmail.com
Shanghai Aladdin Bio-Chem Technology Co.,LTD Gold
Tel
021-20337333-801
Email
market@aladdin-e.com
J & K SCIENTIFIC LTD.
Tel
010-82848833- ;010-82848833-
Email
jkinfo@jkchemical.com;market6@jkchemical.com
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel
21-61259100-
Email
sh@meryer.com