7681-57-4 White or yellowish powder with free sample Sodium metabisulfite

Details:

7681-57-4 White or yellowish powder with free sample Sodium metabisulfite

English name:     Sodium Metabisulfite/cas:7681-57-4

molecule formula:Na2S2O5 
molecule weight:190.10
Physical properties:
It is white or tiny yellow crystal powder. Its relative density is 1.4. The solubility  is 54g/100mlwater at 20°C or 81.7g/100mlwater at 100°C,and the solution show acidity. It can solute in glycerine and little in alcohol. When exposed in air, it will oxidized into sodium sulfate, and can react with strong acid into sulfur dioxide gas and the salts. It is  deliquescent, and will decompose when heated to 150°C.

state santandard:GB1893-86
Index

Application:

Used in medicine when producing chloroform,solasulfone and methnylal;used as coagulant in rubber industry; used as dechlorided agent or assistants in printing and dyeing industry; used to improve leather properties in leather industry; used as developing agent in photosensitivity industry; used when producing hydroxyl geranial, hydrochloric hydroxylamine in chemical industry; used as bleaching agent, antiseptics,  antioxidant, ect.in food industry.

Sodium metabisulfite (SMBS, Sodium disulfite) is a white, granular solid sodium salt. an inorganic compound made up of sodium, sulfur, and oxygen, and used in many industries:
in the pulp and paper industry, in the photographic industry and in the various other industries as a bleach or dechlorinator.
Food Grade sodium metabisulfite may be used as a food preservative. It is also commonly added to various food products and wines as a preservative.
Sodium metabisulfite can also be used in the manufacture of other chemicals, Used in production of cleaning agents, detergents, and soaps.
It also acts as a corrosion inhibitor in oil and gas industry, as a bleaching agent in the production of coconut cream, as the source of sulfur dioxide and in the destruction of cyanide in commercial gold cyanidation processes.
Gold mining industry: It is utilized in the precipitation of gold from auric acid as well as in the waste water treatment to remove hexavaent chromium as trivalent chromium by precipitation after reduction.
Preservative in photo developer solutions, it is used in photography.
Oxygen scavenge:it plays as an oxygen scavenger to eliminate the dissolved oxygen in wastewater and in pipes.
Sodium metabisulfite may be used as an initiator during the cross-linking polymerization of polybutadiene in the cores of the vesicle membranes.
It may be added as an antioxidant during the preparation of stock solutions of 6-hydroxydopamine in various studies.
Dechlorination in municipal wastewater, pulp & paper, power, and textile water treatment plants.