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High 97% Purity Sodium Sulfite Food Grade Vegetable Preservative Bleaching Agents

High 97% Purity Sodium Sulfite Food Grade Vegetable Preservative Bleaching Agents

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Brand Name : Kemsky

Model Number : sodium sulfite vegetable preservative

Certification : ISO 9001 SGS

Place of Origin : Hunan

MOQ : 1 metric ton

Price : usd 430 per metric ton

Payment Terms : T/T , L/C

Supply Ability : 3000 tons per month

Delivery Time : 5-8 days

Packaging Details : 25 kgs bag,1000 kgs big bag

name : sodium sulfite vegetable preservative

other name : vegetable preservative anhydrous sodium sulphite

color : white crystalline

usage : vegetable preservative

mocular : Na2SO3

CAS NO : 7757-83-7

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Sodium Sulfite Anhydrous

Property: white gravel or powder crystal,relative density is 1.561, less to dissolve in water and its water solution has alkaline reaction; it is hard to dissolve in ethanol. It is used to produce chloroform,solasulfone and Benzaldehyde in medical industry.

Molecular Formula : Na2SO3

Molecule Weight : 126.04

CAS NO .: 7757-83-7

Appearance : White Free Flowing Fine Crystal or Powder

Specification for Industry Grade and Food Grade :

ItemQuality Index
Industry GradeFood Grade
Purity ( As Na2SO3)96.0% min98.0% min
Sodium sulphate ( SO4)2.0% max1.0% max
Chlorides ( As NaCL)0.5% max0.1% max
Arsenic ( As )-0.0002% max
Heavy metals ( As Pb )-0.0005% max
Iron (Fe)0.005% max0.002% max
Water insolubles0.05% max0.02% max

Specification For Photo Grade and Pharmaceutical Grade

ItemQuality Index
Photo GradePharmaceutical Grade
Purity ( As Na2SO3)98.0% min98.0% min
Sodium sulphate ( SO4 )1.0% max1.0% max
Chlorides ( As CL-)0.05% max0.05% max
Arsenic ( As )0.0002% max2ppm max
Lead ( As Pb)0.0005% max2ppm max
Iron (Fe)0.001% max5ppm max
Selenium ( Se)0.0001% max1ppm max
Zinc ( Zn)0.0001% max1ppm max
Copper ( Cu )0.0001% max0.1ppm max
Mercury ( Hg)0.0001% max0.1 ppm max

Application :

(1) Industry Grade : Used in Dyeing and printing Industry ,as dechlorinating agent and bleaching agent, in leather and tanning industry as bleaching agent , developer agent , reductant agent , stabilizer agent , or used in papermaking, electronic and water treatment industry.

(2) Food Grade: In food industry as additive (E223) preservative, antioxidant and antimicrobic for fruits (dried, glazed and candled), vegetables (onions, potatoes, etc.), juices (citrus and grapes) and fish (shrimps and prawns). In silage treatment as antifermentative. In starch and sweeteners production as bacteriostatic.

(3) Photo Grade: In the photographic industry as component of developer bath .

(4) Pharmaceutical Grade : pharmaceutical industry for the production of chloroform, benzene and formaldehyde phenylpropanoid Sulfone

Packing: Packed in 25kg plastic woven bag, Kraft paper bag, PE bag, 500kg/1000kg/1100kg/1200kg jumbo bag or as per the buyer’s requirement

Storage: Store the product in a dry and cool place.

No solid waste generated in our factory.

Keywords: sodium metabisulfite process technology, sodium pyrosulfite technology mass production process, SMBS process, SMBS production, SMBS project, SMBS system, SMBS device.

Basic information

Product Name:Sodium sulfite
Synonyms:Sodium sulfite anhydrous;SODIUM SULFITE, EXSICCATED;SODIUM SULPHITE;anhydroussodiumsulfite;disodiumsulfite;exsiccatedsodiumsulfite;natriisulphis;natriumsulfid
Product Categories:Inorganic Chemicals;Inorganics;Water Ttreatment Chemicals;Analytical Reagents for General Use;Disulfide Bridge Cleavage Reagents;Denaturation;Synthetic Reagents;ACS GradeBiochemicals and Reagents;Synthetic Reagents;inorganic compound;Paper, glass, printing and dyeing
Mol File:7757-83-7.mol

1.GradeFood grade
3.Molecular formulaNa2SO3
5. CAS No7757-83-7
6. HS CODE28321000
7. EINECS No231-821-4

Packing : External packing is PP woven bag, Internal packing is PE bag,25 kgs, 50 kgs, 1000 kgs, and 1250 kgs bag packing.

Storage & defence: Stored in cool and dry place, avoid moisture and heat. No breakage, No mixed with oxidant and toxic matter. The storage period is 6 month since the production date. It should be transported by clean car, with covering matter, avoid rain.

Physical and chemical properties:
White crystalline or powder form; triangular prism crystal shape; alkaline water solution with pH at 9 – 9.5; The highest water solubility is about 28% with temperature at 33.4°C. When exposed to air, it is oxidized to form sodium sulfate. When heated to high temperature, it decomposes to form sodium sulfide; Density: 2.633(15.4°C), Refractive Index: 1.565; Molecular Weight: 126.04.

Chemical Properties

melting point500 °C
refractive index1,484
storage temp.Store at RT.
solubilityH2O: 1 M at 20 °C, clear, colorless
Water Solubility23 g/100 mL (20 ºC)
StabilityStable. Incompatible with strong acids. Moisture and air sensitive.

Technical specification


Anhydyous sodium sulphite
English nameAnhydyous sodium sulphite
Molecular formulaNa2SO3
Technical specificationsHigh purity gradeRefined gradePhotographic gradeIndustrial gradeIndustrial gradeIndustrial grade
Sodium sulfiteSodium sulfiteSodium sulfiteHigh-class productHigh-class productFirst grade product
Na2SO3 ≥ %989897989796
Fe ≤ %0.00050.0020.0050.0030.0030.005
Water insoluble ≤ %0.0050.
Free alkali ≤ %
Sodium sulfate ≤ %
Sodium chloride ≤ %0.0050.020.010.1
Heavy metal on Pb≤ %0.0010.0020.002
As ≤ %0.00010.0005
Sodium thiosulfate ≤%
Aqueous solution appearanceQualifiedQualifiedQualified
Reaction of silver nitrate ammonia solutionQualified

Product Tags:

sodium sulfite anhydrous


sodium sulfite oxygen scavenger

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