Chlorosulfonic acid

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  • Identifiers

    CAS number
    7790-94-5

    Molecular formula
    ClHO3S

    SMILES
    OS(=O)(=O)Cl

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 90.91%
    Sulfurous 18.5%
    Pungent 15.9%
    Cooked 15.64%
    Savory 14.94%
    Sharp 12.11%
    Sour 12.07%
    Clean 12.05%
    Burnt 11.95%
    Roasted 11.5%

     

    Flavor
    Bitter 68.33%
    Odorless 41.11%
    Bland 24.95%
    Formyl 21.26%
    Nitrile 20.05%
    Rotten 19.73%
    Mousy 19.35%
    Urine 18.87%
    Sulfur 18.55%
    Decomposing cabbage 18.24%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    -0.1

    pKa est.
    4.69 (weak acid)

    Molecular weight
    116.53 g/mol

    Melting point expt.

    • -112 °F (USCG, 1999)
    • -80 °C

    Boiling point

    • 311 °F at 760 mmHg (USCG, 1999)
    • 151-152 °C AT 755 MM HG; 74-75 °C AT 19 MM HG; 60-64 °C AT 2-4 MM HG
    • at 100kPa: 151-152 °C

    Flash point

    • 120.14 ˚C est.

    Solubility expt.

    • /COMMON SOLVENTS INCLUDE/ LIQUID SULFUR DIOXIDE, PYRIDINE, & DICHLOROETHANE.
    • Solubility in water: reaction

  • Synonyms

    • CHLOROSULFONIC ACID
    • Chlorosulfuric acid
    • 7790-94-5
    • Sulfuric chlorohydrin
    • sulfurochloridic acid
    • Chlorosulphonic acid
    • Chlorosulphuric acid
    • Monochlorosulfuric acid
    • Sulfonic acid, monochloride
    • HSDB 909
    • UNII-2O9AXL1TJ4
    • EINECS 232-234-6
    • 2O9AXL1TJ4
    • UN1754
    • Chloridosulfuric acid
    • CHLOROSULFONIC ACID [MI]
    • DTXSID1029706
    • CHLOROSULFONIC ACID [HSDB]
    • EC 232-234-6
    • MFCD00011523
    • Chlorosulfonic acid, 99%
    • CHLOROSULFURIC ACID (CHLOROSULFONIC ACID)
    • CHLOROSULFURIC ACID {CHLOROSULFONIC ACID}
    • sulfochloride
    • chlorosufonic acid
    • chorosulfonic acid
    • chlorsulphonic acid
    • Chiorosulfonic acid
    • Chlorosulfuric Acid; Monochlorosulfonic Acid; Monochlorosulfuric Acid; Sulfuric Acid Chlorohydrin; Sulfuric Chlorohydrin;
    • chloranesulfonic acid
    • chloro sulfonic acid
    • chloro sulfuric acid
    • chloro-sulfonic acid
    • chloro sulphonic acid
    • chlorosul-phonic acid
    • sulfurochloridoic acid
    • ClSO2OH
    • ClSO3H
    • HOSO2Cl
    • Chlorosulfonic acid, CP
    • CHLORSULFONIC ACID
    • sulfuric acid chlorohydrin
    • SULFURIC CHLORHYDRIN
    • MONOCHLOROSULFONIC ACID
    • DTXCID709706
    • AKOS000269020
    • Chlorosulfonic acid, reagent grade, >=99%
    • C1788
    • NS00019923
    • monochlorosulfuricacid;sulfonicacid,monochloride
    • Q411060
    • Chlorosulfonic acid (with or without sulfur trioxide)
    • Chlorosulfonic acid (with or without sulfur trioxide) [UN1754] [Corrosive]

  • Applications

    Chlorosulfonic acid is a highly reactive sulfonating and chlorinating agent used to introduce sulfonyl groups into organic substrates. In industry it is commonly employed to prepare arylsulfonyl chlorides (and related sulfonate derivatives) that serve as key intermediates in the manufacture of dyes and pigments, and in pharmaceutical and agrochemical syntheses. It also enables conversion of alcohols and other nucleophiles into sulfonate esters or sulfonyl chlorides, which can be hydrolyzed to sulfonic acids for surfactants and resin applications. In polymer, coating, and adhesive technology, it is used to functionalize polymers and to produce sulfonated resins and ion-exchange materials, supporting membrane and coating formulations as well as specialty binders.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 206.96
    methanol 363.74
    isopropanol 163.28
    water 333.52
    ethyl acetate 57.82
    n-propanol 131.3
    acetone 274.89
    n-butanol 96.77
    acetonitrile 127.68
    DMF 1086.0
    toluene 31.1
    isobutanol 89.95
    1,4-dioxane 223.83
    methyl acetate 89.76
    THF 272.63
    2-butanone 127.75
    n-pentanol 67.95
    sec-butanol 103.2
    n-hexane 12.74
    ethylene glycol 181.78
    NMP 519.82
    cyclohexane 19.39
    DMSO 865.1
    n-butyl acetate 39.93
    n-octanol 41.58
    chloroform 24.19
    n-propyl acetate 52.69
    acetic acid 119.29
    dichloromethane 47.32
    cyclohexanone 116.05
    propylene glycol 116.46
    isopropyl acetate 46.74
    DMAc 672.21
    2-ethoxyethanol 221.94
    isopentanol 75.07
    n-heptane 15.2
    ethyl formate 89.43
    1,2-dichloroethane 57.99
    n-hexanol 48.32
    2-methoxyethanol 405.73
    isobutyl acetate 28.25
    tetrachloromethane 7.75
    n-pentyl acetate 36.33
    transcutol 169.04
    n-heptanol 39.5
    ethylbenzene 17.6
    MIBK 60.18
    2-propoxyethanol 146.68
    tert-butanol 153.91
    MTBE 84.47
    2-butoxyethanol 94.96
    propionic acid 74.34
    o-xylene 33.29
    formic acid 197.9
    diethyl ether 105.98
    m-xylene 26.92
    p-xylene 21.15
    chlorobenzene 17.71
    dimethyl carbonate 103.07
    n-octane 7.08
    formamide 347.87
    cyclopentanone 166.93
    2-pentanone 100.36
    anisole 66.0
    cyclopentyl methyl ether 106.67
    gamma-butyrolactone 155.66
    1-methoxy-2-propanol 267.69
    pyridine 103.33
    3-pentanone 81.04
    furfural 179.81
    n-dodecane 5.24
    diethylene glycol 189.48
    diisopropyl ether 30.43
    tert-amyl alcohol 101.67
    acetylacetone 113.33
    n-hexadecane 5.58
    acetophenone 62.08
    methyl propionate 87.09
    isopentyl acetate 29.9
    trichloroethylene 44.49
    n-nonanol 37.06
    cyclohexanol 71.58
    benzyl alcohol 63.29
    2-ethylhexanol 27.09
    isooctanol 28.61
    dipropyl ether 58.71
    1,2-dichlorobenzene 16.51
    ethyl lactate 56.57
    propylene carbonate 69.71
    n-methylformamide 360.74
    2-pentanol 67.54
    n-pentane 21.09
    1-propoxy-2-propanol 99.07
    1-methoxy-2-propyl acetate 63.22
    2-(2-methoxypropoxy) propanol 86.95
    mesitylene 22.12
    ε-caprolactone 86.75
    p-cymene 16.04
    epichlorohydrin 137.13
    1,1,1-trichloroethane 20.03
    2-aminoethanol 189.44
    morpholine-4-carbaldehyde 431.33
    sulfolane 247.18
    2,2,4-trimethylpentane 6.39
    2-methyltetrahydrofuran 126.55
    n-hexyl acetate 38.94
    isooctane 5.11
    2-(2-butoxyethoxy)ethanol 100.67
    sec-butyl acetate 30.98
    tert-butyl acetate 49.76
    decalin 6.36
    glycerin 191.57
    diglyme 203.61
    acrylic acid 83.83
    isopropyl myristate 23.39
    n-butyric acid 63.12
    acetyl acetate 38.01
    di(2-ethylhexyl) phthalate 27.37
    ethyl propionate 50.57
    nitromethane 244.91
    1,2-diethoxyethane 73.74
    benzonitrile 40.28
    trioctyl phosphate 23.75
    1-bromopropane 34.81
    gamma-valerolactone 228.51
    n-decanol 30.91
    triethyl phosphate 31.62
    4-methyl-2-pentanol 39.98
    propionitrile 72.56
    vinylene carbonate 67.42
    1,1,2-trichlorotrifluoroethane 112.66
    DMS 41.39
    cumene 15.23
    2-octanol 29.4
    2-hexanone 63.35
    octyl acetate 30.95
    limonene 23.04
    1,2-dimethoxyethane 359.23
    ethyl orthosilicate 29.22
    tributyl phosphate 24.11
    diacetone alcohol 91.54
    N,N-dimethylaniline 78.83
    acrylonitrile 98.4
    aniline 64.56
    1,3-propanediol 168.3
    bromobenzene 12.16
    dibromomethane 32.28
    1,1,2,2-tetrachloroethane 44.96
    2-methyl-cyclohexyl acetate 32.47
    tetrabutyl urea 54.22
    diisobutyl methanol 23.48
    2-phenylethanol 42.26
    styrene 21.16
    dioctyl adipate 34.75
    dimethyl sulfate 172.32
    ethyl butyrate 41.48
    methyl lactate 106.98
    butyl lactate 43.48
    diethyl carbonate 32.18
    propanediol butyl ether 81.15
    triethyl orthoformate 40.57
    p-tert-butyltoluene 17.17
    methyl 4-tert-butylbenzoate 64.26
    morpholine 253.27
    tert-butylamine 93.34
    n-dodecanol 26.24
    dimethoxymethane 431.15
    ethylene carbonate 60.54
    cyrene 105.69
    2-ethoxyethyl acetate 49.05
    2-ethylhexyl acetate 25.01
    1,2,4-trichlorobenzene 20.23
    4-methylpyridine 98.74
    dibutyl ether 34.35
    2,6-dimethyl-4-heptanol 23.48
    DEF 195.8
    dimethyl isosorbide 115.19
    tetrachloroethylene 32.8
    eugenol 75.7
    triacetin 48.74
    span 80 62.87
    1,4-butanediol 95.5
    1,1-dichloroethane 34.97
    2-methyl-1-pentanol 46.4
    methyl formate 258.26
    2-methyl-1-butanol 72.22
    n-decane 7.52
    butyronitrile 65.0
    3,7-dimethyl-1-octanol 28.41
    1-chlorooctane 16.67
    1-chlorotetradecane 9.6
    n-nonane 7.77
    undecane 6.04
    tert-butylcyclohexane 5.33
    cyclooctane 9.79
    cyclopentanol 100.13
    tetrahydropyran 114.09
    tert-amyl methyl ether 70.87
    2,5,8-trioxanonane 166.33
    1-hexene 24.67
    2-isopropoxyethanol 127.76
    2,2,2-trifluoroethanol 91.52
    methyl butyrate 70.56

    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