Description Uses Preparation References
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Sodium dithionite

Description Uses Preparation References
Product Name
Sodium dithionite
CAS No.
7775-14-6
Chemical Name
Sodium dithionite
Synonyms
SODIUM HYDROSULFITE;SODIUM HYDROSULPHITE;HYDROSULFITE;hydros;Natriumdithionit;disodiumhydrosulfite;SODIUM HYPODISULFITE;Sodium hydrosulfite, anhydrous;burmol;blankit
CBNumber
CB1155576
Molecular Formula
Na2O4S2
Formula Weight
174.11
MOL File
7775-14-6.mol
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Sodium dithionite Property

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℃)
Odor
None or slight scent of sulfur dioxide
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.
LogP
-2.756 (est)
CAS DataBase Reference
7775-14-6(CAS DataBase Reference)
EPA Substance Registry System
Sodium hydrosulfite (7775-14-6)
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Safety

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
F 
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
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H251Self-heating; may catch fire

H302Harmful if swallowed

H319Causes serious eye irritation

Precautionary statements

P235Keep cool.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
157953
Product name
Sodium hydrosulfite
Purity
technical grade
Packaging
1kg
Price
$80.6
Updated
2024/03/01
Sigma-Aldrich
Product number
157953
Product name
Sodium hydrosulfite
Purity
technical grade
Packaging
2kg
Price
$143
Updated
2024/03/01
Sigma-Aldrich
Product number
1.06505
Product name
Sodium dithionite
Purity
EMPLURA?
Packaging
1kg
Price
$190
Updated
2024/03/01
Sigma-Aldrich
Product number
1.06505
Product name
Sodium dithionite
Purity
EMPLURA?
Packaging
50kg
Price
$6170
Updated
2024/03/01
Sigma-Aldrich
Product number
1.06507
Product name
Sodium dithionite
Purity
for analysis EMSURE?
Packaging
500g
Price
$170
Updated
2022/05/15
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Sodium dithionite Chemical Properties,Usage,Production

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.

Uses

Sodium hydrosulfite is used as a reducing agent in aqueous solutions, sulfonating agent , chelating agent and decolorizing agent in organic reactions. It finds application in water treatment, gas purification, cleaning, leather, polymers, photography, and many others. It is involved in chemical enhanced oil recovery to stabilize polyacrylamide polymers against radical degradation in the presence of iron. It plays an important role to determine the iron content in soil chemistry.

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.

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.

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.

Flammability and Explosibility

Not classified

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

Sodium dithionite Preparation Products And Raw materials

Raw materials

ZINC Stainless steel reactor Ethanol ZINC HYDROSULFITE Sulfur dioxide Zinc hydroxide SODIUM SULFITE HEPTAHYDRATE Sodium formate Methanol Sodium hydroxide Sodium metabisulfite

Preparation Products

SODIUM DITHIONATE Vitamin B2 8-METHYLXANTHINE 4-Aminobenzyl alcohol 4-AMINORESORCINOL HYDROCHLORIDE 4.4'-DIAMINODIPHENYLAMINESULFATE 5-Fluoroindole-2-carboxylic acid Sodium salicylate Luminol (2,4-DIAMINOPTERIDIN-6-YL)METHANOL HYDROCHLORIDE HYDRATE Trimethylhydroquinone 4,5,6-TRIAMINOPYRIMIDINE 4-amino-1-naphthol Naphthol AS-OL BASIC BLUE 3 4-(1,2,3-THIADIAZOL-4-YL)ANILINE 4-Azaindole 5,6-DIAMINO-2,4-DIHYDROXYPYRIMIDINE SULFATE TRIFLUOROMETHYL SULFINYL CHLORIDE 1H-1,2,3-Triazolo[4,5-d]pyrimidin-7-amine 4,5,6-TRIAMINOPYRIMIDINE SULFATE Glyoxalbis(2-hydroxyanil) Riboflavin 8-BROMO-3-METHYL-3,7-DIHYDRO-PURINE-2,6-DIONE 5-Hydroxyanthranilic acid 8-AZAGUANINE N-(2,5-Dimethoxyphenyl)-2-hydroxydibenzofuran-3-carboxamide 3-Methylxanthine 3-(3-AMINOPHENYL)-2H-CHROMEN-2-ONE (2-CYANO-3-PYRIDINYL)CARBAMIC ACID, 1,1-DIMETHYL ETHYL ESTER 3-BROMO-4-(TRIFLUOROMETHOXY)PHENOL 3-Hydroxy-N-2-naphthyl-2-naphthamide 2,5-Diamino-4,6-dihydroxy-pyrimidine 3-(4-AMINO-PHENYL)-CHROMEN-2-ONE 3-BROMO-4-(TRIFLUOROMETHOXY)ANILINE Hexachlorophene Disperse Blue BGL 5-Aminouracil 5,6-Diamino-1-methyluracil 2-Amino-5-chlorobenzaldehyde
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View Lastest Price from Sodium dithionite manufacturers

Hebei Weibang Biotechnology Co., Ltd
Product
Disodium hydrosulfite 7775-14-6
Price
US $10.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
10 mt
Release date
2024-11-13
Hebei Yanxi Chemical Co., Ltd.
Product
Sodium dithionite 7775-14-6
Price
US $20.00-10.00/kg
Min. Order
1kg
Purity
0.99
Supply Ability
10 tons
Release date
2023-10-26
Hebei Chuanghai Biotechnology Co,.LTD
Product
Sodium Dithionite 7775-14-6
Price
US $5.00/KG
Min. Order
10KG
Purity
90 %
Supply Ability
10000kg
Release date
2024-08-20

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