Sodium Dithionite

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  • Identifiers

    CAS number
    7775-14-6

    Molecular formula
    Na2O4S2

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

    Safety labels

    Flammable
    Flammable

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 77.34%
    Sulfurous 30.43%
    Savory 23.36%
    Cooked 21.1%
    Pungent 19.7%
    Garlic 18.25%
    Onion 17.98%
    Roasted 17.35%
    Meaty 16.66%
    Alliaceous 16.5%

     

    Flavor
    Odorless 46.36%
    Bitter 38.59%
    Nutty 21.26%
    Cooked 21.03%
    Nitrile 20.97%
    Bland 20.76%
    Sulfur 20.2%
    Bread crust 19.98%
    Formyl 19.9%
    Taco 19.63%

     

    Odor impact est.
    Medium

  • Properties

    pKa est.
    -10.62 (strong acid)

    Molecular weight
    174.11 g/mol

    Melting point expt.

    • 52 °C (decomposes)

    Flash point

    • 136.26 ˚C est.
    • about 100 °C (open cup)
    • >100 °C o.c.

    Solubility expt.

    • Slightly sol in alcohol; very soluble in water
    • Slightly sol in cold water; insoluble in acids
    • At 20 °C, 24.1 g/100 g water
    • Solubility in water, g/100ml at 20 °C: 25 (moderate)

  • Synonyms

    • Sodium dithionite
    • SODIUM HYDROSULFITE
    • 7775-14-6
    • Sodium hydrosulphite
    • Vatrolite
    • Sodium sulfoxylate
    • Disodium dithionite
    • Dithionous acid, disodium salt
    • Blankit
    • Burmol
    • Hydros
    • Blankit IN
    • V-Brite B
    • Hydrosulfite R Conc
    • Disodium hydrosulfite
    • Sodium hydrosulfite (Na2S2O4)
    • Sodium dithionite (Na2(S2O4))
    • 2K5B8F6ES1
    • DTXSID9029697
    • CHEBI:66870
    • RefChem:6237
    • DTXCID609697
    • 231-890-0
    • Dithionite, Sodium
    • sodiumdithionite
    • Sodium hypodisulfite
    • MFCD00011640
    • Sodium Hydrosulfite, 85%
    • Caswell No. 774
    • CCRIS 1428
    • HSDB 746
    • EINECS 231-890-0
    • UN1384
    • EPA Pesticide Chemical Code 078202
    • UNII-2K5B8F6ES1
    • Natriumdithionit
    • sodium dithionit
    • sodiumhydrosulfite
    • Sodiumhydrosulphite
    • sodium hydro sulfite
    • Dithionous acid, sodium salt (1:2)
    • sodium sodium hydrosulfite
    • Dithionous aciddisodiuMsalt
    • Na2O4S2
    • Na2S2O4
    • EC 231-890-0
    • SCHEMBL1471
    • Sodium dithionite (Na2S2O4)
    • SODIUM DITHIONITE [II]
    • SODIUM DITHIONITE [MI]
    • CHEMBL3410462
    • Na2 (S2 O4)
    • SODIUM DITHIONITE [MART.]
    • SODIUM HYDROSULFITE [HSDB]
    • AKOS015904498
    • Sodium dithionite or sodium hydrosulfite
    • BP-13393
    • NS00014058
    • S0562
    • F095098
    • Q414560
    • Sodium dithionite or sodium hydrosulfite [UN1384] [Spontaneously combustible]
    • 7775-14-6

  • Applications

    Sodium Dithionite (CAS 7775-14-6) is a strong reducing agent used across several industrial processes. In the pulp and paper industry it is employed for bleaching and delignification to increase whiteness and brightness of the pulp. In textiles, it acts as a reducing agent for vat dyes, enabling dyeing of fiber by developing the leuco form and facilitating colorfast fixation; it is also used in pretreatment and finishing steps to prepare fabrics. In metal finishing and coatings, it is used for oxide and rust removal and surface cleaning to improve adhesion before plating or painting. It also appears in some coating and ink formulations as a reducing additive to control color development and pigment bleaching. In addition, it may be used as a chemical reducing agent or intermediate in certain industrial syntheses, subject to process-specific limits and local regulations.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 32.41
    methanol 63.71
    isopropanol 18.48
    water 20.11
    ethyl acetate 18.54
    n-propanol 20.2
    acetone 53.6
    n-butanol 14.89
    acetonitrile 31.26
    DMF 236.81
    toluene 5.44
    isobutanol 10.94
    1,4-dioxane 44.65
    methyl acetate 31.16
    THF 57.28
    2-butanone 31.02
    n-pentanol 11.51
    sec-butanol 16.1
    n-hexane 2.56
    ethylene glycol 48.83
    NMP 199.16
    cyclohexane 9.68
    DMSO 454.18
    n-butyl acetate 14.86
    n-octanol 14.03
    chloroform 17.93
    n-propyl acetate 12.06
    acetic acid 44.0
    dichloromethane 29.13
    cyclohexanone 35.84
    propylene glycol 21.06
    isopropyl acetate 11.56
    DMAc 181.54
    2-ethoxyethanol 42.41
    isopentanol 10.52
    n-heptane 7.74
    ethyl formate 24.25
    1,2-dichloroethane 30.34
    n-hexanol 12.18
    2-methoxyethanol 86.28
    isobutyl acetate 4.6
    tetrachloromethane 6.39
    n-pentyl acetate 12.82
    transcutol 94.99
    n-heptanol 10.79
    ethylbenzene 3.62
    MIBK 9.98
    2-propoxyethanol 34.49
    tert-butanol 19.62
    MTBE 14.0
    2-butoxyethanol 23.17
    propionic acid 24.38
    o-xylene 7.06
    formic acid 74.51
    diethyl ether 21.4
    m-xylene 4.39
    p-xylene 4.0
    chlorobenzene 6.28
    dimethyl carbonate 22.23
    n-octane 3.85
    formamide 132.26
    cyclopentanone 46.58
    2-pentanone 20.56
    anisole 10.4
    cyclopentyl methyl ether 22.05
    gamma-butyrolactone 56.98
    1-methoxy-2-propanol 49.02
    pyridine 33.45
    3-pentanone 21.3
    furfural 62.57
    n-dodecane 2.83
    diethylene glycol 52.54
    diisopropyl ether 6.52
    tert-amyl alcohol 17.14
    acetylacetone 28.64
    n-hexadecane 3.11
    acetophenone 15.57
    methyl propionate 26.92
    isopentyl acetate 9.75
    trichloroethylene 29.44
    n-nonanol 12.68
    cyclohexanol 19.39
    benzyl alcohol 14.27
    2-ethylhexanol 9.1
    isooctanol 7.7
    dipropyl ether 16.31
    1,2-dichlorobenzene 7.64
    ethyl lactate 13.47
    propylene carbonate 21.61
    n-methylformamide 100.2
    2-pentanol 11.91
    n-pentane 5.42
    1-propoxy-2-propanol 27.17
    1-methoxy-2-propyl acetate 20.83
    2-(2-methoxypropoxy) propanol 28.71
    mesitylene 4.21
    ε-caprolactone 30.4
    p-cymene 6.5
    epichlorohydrin 42.95
    1,1,1-trichloroethane 9.54
    2-aminoethanol 38.94
    morpholine-4-carbaldehyde 126.03
    sulfolane 121.11
    2,2,4-trimethylpentane 1.9
    2-methyltetrahydrofuran 30.26
    n-hexyl acetate 14.92
    isooctane 1.22
    2-(2-butoxyethoxy)ethanol 37.34
    sec-butyl acetate 6.51
    tert-butyl acetate 11.1
    decalin 2.34
    glycerin 44.68
    diglyme 72.93
    acrylic acid 31.0
    isopropyl myristate 8.52
    n-butyric acid 19.02
    acetyl acetate 12.61
    di(2-ethylhexyl) phthalate 8.09
    ethyl propionate 11.53
    nitromethane 99.44
    1,2-diethoxyethane 25.83
    benzonitrile 13.82
    trioctyl phosphate 7.78
    1-bromopropane 13.61
    gamma-valerolactone 61.95
    n-decanol 10.3
    triethyl phosphate 9.89
    4-methyl-2-pentanol 6.3
    propionitrile 19.41
    vinylene carbonate 20.04
    1,1,2-trichlorotrifluoroethane 58.98
    DMS 17.51
    cumene 3.12
    2-octanol 9.14
    2-hexanone 12.18
    octyl acetate 10.9
    limonene 10.71
    1,2-dimethoxyethane 56.73
    ethyl orthosilicate 9.22
    tributyl phosphate 8.26
    diacetone alcohol 23.11
    N,N-dimethylaniline 14.09
    acrylonitrile 31.8
    aniline 13.19
    1,3-propanediol 35.56
    bromobenzene 4.69
    dibromomethane 20.01
    1,1,2,2-tetrachloroethane 31.0
    2-methyl-cyclohexyl acetate 10.0
    tetrabutyl urea 18.19
    diisobutyl methanol 8.14
    2-phenylethanol 13.38
    styrene 4.43
    dioctyl adipate 13.67
    dimethyl sulfate 52.77
    ethyl butyrate 13.69
    methyl lactate 30.99
    butyl lactate 15.08
    diethyl carbonate 9.8
    propanediol butyl ether 26.05
    triethyl orthoformate 12.75
    p-tert-butyltoluene 6.35
    methyl 4-tert-butylbenzoate 21.61
    morpholine 56.68
    tert-butylamine 12.8
    n-dodecanol 8.77
    dimethoxymethane 68.62
    ethylene carbonate 16.51
    cyrene 31.73
    2-ethoxyethyl acetate 18.85
    2-ethylhexyl acetate 8.21
    1,2,4-trichlorobenzene 9.94
    4-methylpyridine 21.59
    dibutyl ether 13.18
    2,6-dimethyl-4-heptanol 8.14
    DEF 54.44
    dimethyl isosorbide 44.24
    tetrachloroethylene 26.87
    eugenol 22.5
    triacetin 21.91
    span 80 24.14
    1,4-butanediol 18.79
    1,1-dichloroethane 12.33
    2-methyl-1-pentanol 7.9
    methyl formate 68.0
    2-methyl-1-butanol 10.5
    n-decane 4.34
    butyronitrile 14.43
    3,7-dimethyl-1-octanol 9.68
    1-chlorooctane 7.91
    1-chlorotetradecane 4.25
    n-nonane 4.43
    undecane 3.42
    tert-butylcyclohexane 1.41
    cyclooctane 4.77
    cyclopentanol 23.86
    tetrahydropyran 26.06
    tert-amyl methyl ether 14.53
    2,5,8-trioxanonane 59.45
    1-hexene 4.26
    2-isopropoxyethanol 23.49
    2,2,2-trifluoroethanol 33.64
    methyl butyrate 15.91

    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