Sodium Metabisulfite

详情

We are a leading supplier & exporter of Sodium Metabisulfite from China. We supply high quality products on wholesale price. We also ensure purity of the chemicals we sell. Wanna buy, feel free to contact us.


SODIUM METABISULFITE
 
PRODUCT IDENTIFICATION
 
CAS NO.
 ********4
 
 
EINECS NO.
 ********0
 
FORMULA
 Na2S2O5
 
MOL WT.
 **0.*0
 
H.S. CODE
  
 
TOXICITY
  
 
SYNONYMS
 Dinatriumdisulfit; Disulfito de disodio; Disulfite de disodium; Disodium disulfite; Disodium Salt Pyrosulfurous Acid; Disulfurous acid, disodium salt; Pyrosulfurous acid, disodium salt; Sodium Metabisulfite; Sodium disulfite; Sodium Pyrosulfite
 
DERIVATION
  
 
CLASSIFICATION
  
 
PHYSICAL AND CHEMICAL PROPERTIES
 
PHYSICAL STATE
 white crystalline powder with odor of sulfur dioxide
 
MELTING POINT
 **0 C (Decomposes)
 
BOILING POINT
  
 
SPECIFIC GRAVITY
 1.*8
 
SOLUBILITY IN WATER
 Freely soluble (**0g/l)
 
pH
 3.5 - 5
 
VAPOR DENSITY
  
 
AUTOIGNITION
  
 
NFPA RATINGS
 Health: 1; Flammability: 0; Reactivity: 0
 
REFRACTIVE INDEX
  
 
FLASH POINT
  
 
STABILITY
 Stable under ordinary conditions. Hygroscopic.
 
GENERAL DESCRIPTION & APPLICATIONS
 
Sodium Metabisulfite is a white to slightly yellowish crystalline powder with sulfur dioxide odor; readily soluble in water. Sodium metabisulfite containing more than *5.0% SO2 w/w releases sulfur dioxide gas when mixed with water. It forms a bisulfite adduct with aldehyde and with ketones to a sulfonic acid. It is used to purify or isolate aldehydes and ketones. Sodium metabisulfite's reductive and sulfonating properties provide versatile applications. It is used as an oxygen scavenger to eliminate the dissolved oxygen in waste water and in pipes.

Sodium Metabisulfite is a reductive bleaching agent. It reduces carbonyl and alcohol groups, which function as colorants of the substances. It is used in bleaching mechanical paper pulp, cotton, wool and kaolin clay. Additional applications include as a preservative (antioxidant), a hair waving agent, and Ensiling agent. Bisulfites are used in industries concerned with leather processing, food and beverage processing, gas purification, water treatment  to remove excess chlorine, textiles and pulp processing, and many others. It is used as a reducing agent in chemical manufacturing. It is an alternative to sulfur dioxide which is used in sterilization of equipment.
 
SALES SPECIFICATION
 
TECH GRADE
 
APPEARANCE
 White to slightly yellowish crystalline powder
 
CONTENT
 *8.0% min
 
SO2
 *5.0% min
 
Na2S2O4
 2.0% max
 
INSOLUBLES IN WATER
 0.*5% max
 
PARTICLE SIZE
 *5% (mesh **0)
 
pH
 4 *4.6
 
Fe
 5ppm max
 
FOOD GRADE
 
APPEARANCE
 White to slightly yellowish crystalline powder
 
CONTENT
 *8.0% min
 
SO2
 *5.0% min
 
Na2S2O4
 2.0% max
 
INSOLUBLES IN WATER
 0.*5% max
 
PARTICLE SIZE
 *5% (mesh **0)
 
HEAVY METALS
 *0ppm max
 
As
 1ppm max
 
Fe
 5ppm max
 
pH
 4.5 - 5.5
 
TRANSPORTATION
 
PACKING
 *5kgs in bag