Sodium dithionate

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  • Identifiers

    CAS number
    7631-94-9

    Molecular formula
    Na2O6S2

    SMILES
    [O-]S(=O)(=O)S(=O)(=O)[O-].[Na+].[Na+]

    Safety labels

  • Odor profile

    Fragrance
    Odorless 87.2%
    Sulfurous 18.71%
    Pungent 18.47%
    Cooked 16.15%
    Savory 14.19%
    Burnt 14.19%
    Garlic 13.15%
    Onion 12.63%
    Alliaceous 12.46%
    Roasted 11.21%

     

    Flavor
    Bitter 65.42%
    Odorless 38.8%
    Bland 22.38%
    Nitrile 20.05%
    Formyl 19.07%
    Rotten 18.8%
    Bread crust 18.21%
    Mousy 17.96%
    Urine 17.93%
    Taco 17.91%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    -1.76 (strong acid)

    Molecular weight
    206.11 g/mol

    Flash point

    • 132.4 ˚C est.

  • Synonyms

    • Sodium dithionate
    • Disodium dithionate
    • 7631-94-9
    • Sodium hyposulfate
    • Sodium sulfate (Na2S2O6)
    • Dithionic acid, disodium salt
    • RPF7Z41GAW
    • DTXSID70227181
    • NSC-50070
    • RefChem:931914
    • DTXCID70149672
    • Dithionic acid, disodium salt (8CI)
    • 231-550-1
    • Sodium metabisulfate
    • Sodiumdithionate
    • UNII-RPF7Z41GAW
    • EINECS 231-550-1
    • NSC 50070
    • SODIUM HYPOSULPHATE
    • SCHEMBL144015
    • SODIUM DITHIONATE [MI]
    • DITHIONIC ACID, SODIUM SALT (1:2)
    • NS00046815
    • Q955503
    • 7631-94-9

  • Applications

    Sodium dithionate (CAS 7631-94-9) is used primarily as a mild oxidizing agent and as a source of dithionate for redox reactions and analytical applications. It is commonly evaluated for bleaching and oxidation in the pulp and paper industry, for controlled oxidation in textile processing, and as a component in coatings and inks formulations. It also acts as an intermediate in chemical manufacturing and can appear in industrial cleaning formulations as an oxidizing additive. Subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 33.44
    methanol 64.53
    isopropanol 20.76
    water 25.58
    ethyl acetate 16.72
    n-propanol 19.63
    acetone 48.15
    n-butanol 14.38
    acetonitrile 25.93
    DMF 278.22
    toluene 5.11
    isobutanol 10.58
    1,4-dioxane 37.81
    methyl acetate 24.27
    THF 49.5
    2-butanone 29.57
    n-pentanol 9.7
    sec-butanol 17.72
    n-hexane 2.24
    ethylene glycol 47.97
    NMP 222.38
    cyclohexane 8.85
    DMSO 560.23
    n-butyl acetate 11.13
    n-octanol 13.05
    chloroform 12.23
    n-propyl acetate 8.79
    acetic acid 27.6
    dichloromethane 20.98
    cyclohexanone 32.29
    propylene glycol 23.69
    isopropyl acetate 10.39
    DMAc 213.93
    2-ethoxyethanol 40.26
    isopentanol 9.64
    n-heptane 6.61
    ethyl formate 19.35
    1,2-dichloroethane 23.73
    n-hexanol 10.7
    2-methoxyethanol 91.68
    isobutyl acetate 2.9
    tetrachloromethane 4.48
    n-pentyl acetate 10.14
    transcutol 66.71
    n-heptanol 9.33
    ethylbenzene 3.27
    MIBK 8.6
    2-propoxyethanol 31.32
    tert-butanol 20.31
    MTBE 13.42
    2-butoxyethanol 19.49
    propionic acid 19.77
    o-xylene 7.31
    formic acid 61.76
    diethyl ether 22.37
    m-xylene 4.19
    p-xylene 3.39
    chlorobenzene 4.21
    dimethyl carbonate 20.69
    n-octane 3.35
    formamide 130.49
    cyclopentanone 43.04
    2-pentanone 20.0
    anisole 8.2
    cyclopentyl methyl ether 20.79
    gamma-butyrolactone 47.77
    1-methoxy-2-propanol 54.66
    pyridine 27.94
    3-pentanone 21.57
    furfural 46.48
    n-dodecane 2.36
    diethylene glycol 47.62
    diisopropyl ether 6.29
    tert-amyl alcohol 17.85
    acetylacetone 25.57
    n-hexadecane 2.59
    acetophenone 12.38
    methyl propionate 25.92
    isopentyl acetate 6.79
    trichloroethylene 20.08
    n-nonanol 11.79
    cyclohexanol 19.75
    benzyl alcohol 11.44
    2-ethylhexanol 7.24
    isooctanol 6.42
    dipropyl ether 14.14
    1,2-dichlorobenzene 5.09
    ethyl lactate 11.94
    propylene carbonate 16.94
    n-methylformamide 99.46
    2-pentanol 12.41
    n-pentane 5.17
    1-propoxy-2-propanol 24.58
    1-methoxy-2-propyl acetate 16.82
    2-(2-methoxypropoxy) propanol 23.48
    mesitylene 3.89
    ε-caprolactone 25.29
    p-cymene 5.72
    epichlorohydrin 33.55
    1,1,1-trichloroethane 6.3
    2-aminoethanol 38.2
    morpholine-4-carbaldehyde 116.34
    sulfolane 121.11
    2,2,4-trimethylpentane 1.47
    2-methyltetrahydrofuran 27.43
    n-hexyl acetate 12.5
    isooctane 0.91
    2-(2-butoxyethoxy)ethanol 28.72
    sec-butyl acetate 5.02
    tert-butyl acetate 9.13
    decalin 1.73
    glycerin 48.55
    diglyme 55.3
    acrylic acid 24.33
    isopropyl myristate 6.74
    n-butyric acid 14.61
    acetyl acetate 9.72
    di(2-ethylhexyl) phthalate 5.81
    ethyl propionate 9.71
    nitromethane 75.36
    1,2-diethoxyethane 19.54
    benzonitrile 10.12
    trioctyl phosphate 6.3
    1-bromopropane 11.38
    gamma-valerolactone 53.14
    n-decanol 9.48
    triethyl phosphate 7.7
    4-methyl-2-pentanol 5.76
    propionitrile 17.27
    vinylene carbonate 14.25
    1,1,2-trichlorotrifluoroethane 45.98
    DMS 13.29
    cumene 2.62
    2-octanol 8.2
    2-hexanone 9.71
    octyl acetate 8.89
    limonene 9.31
    1,2-dimethoxyethane 49.95
    ethyl orthosilicate 7.08
    tributyl phosphate 6.22
    diacetone alcohol 20.67
    N,N-dimethylaniline 12.71
    acrylonitrile 26.61
    aniline 12.4
    1,3-propanediol 34.53
    bromobenzene 3.33
    dibromomethane 15.37
    1,1,2,2-tetrachloroethane 23.36
    2-methyl-cyclohexyl acetate 7.19
    tetrabutyl urea 15.09
    diisobutyl methanol 6.84
    2-phenylethanol 11.47
    styrene 3.73
    dioctyl adipate 9.72
    dimethyl sulfate 51.17
    ethyl butyrate 10.39
    methyl lactate 33.16
    butyl lactate 11.69
    diethyl carbonate 7.08
    propanediol butyl ether 21.94
    triethyl orthoformate 9.56
    p-tert-butyltoluene 5.84
    methyl 4-tert-butylbenzoate 17.4
    morpholine 53.45
    tert-butylamine 12.84
    n-dodecanol 7.65
    dimethoxymethane 76.13
    ethylene carbonate 12.5
    cyrene 28.29
    2-ethoxyethyl acetate 14.1
    2-ethylhexyl acetate 5.95
    1,2,4-trichlorobenzene 6.46
    4-methylpyridine 18.84
    dibutyl ether 10.14
    2,6-dimethyl-4-heptanol 6.84
    DEF 56.34
    dimethyl isosorbide 34.07
    tetrachloroethylene 19.0
    eugenol 18.13
    triacetin 14.9
    span 80 18.44
    1,4-butanediol 17.22
    1,1-dichloroethane 9.07
    2-methyl-1-pentanol 6.44
    methyl formate 59.62
    2-methyl-1-butanol 9.9
    n-decane 3.76
    butyronitrile 12.65
    3,7-dimethyl-1-octanol 8.04
    1-chlorooctane 6.77
    1-chlorotetradecane 3.32
    n-nonane 3.81
    undecane 2.91
    tert-butylcyclohexane 1.0
    cyclooctane 4.46
    cyclopentanol 23.22
    tetrahydropyran 23.44
    tert-amyl methyl ether 14.87
    2,5,8-trioxanonane 43.92
    1-hexene 3.65
    2-isopropoxyethanol 20.26
    2,2,2-trifluoroethanol 24.35
    methyl butyrate 12.56

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction