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Benzenesulfonic acid

Benzenesulfonic acid
Benzenesulfonic acid structure
Chemical Name:
Benzenesulfonic acid
BL70;17-120a;1998/11/3;besylicacid;Besylic acid;Benzolsulfonsure;BENZOLSULFONSAEURE;benzenesulfonicaci;Benzensulfonic acid;BENZENESULFONIC ACID
Molecular Formula:
Formula Weight:
MOL File:

Benzenesulfonic acid Properties

Melting point:
30-60 °C
Boiling point:
refractive index 
1.5151 (estimate)
Flash point:
>230 °F
storage temp. 
Store below +30°C.
H2O: soluble0.1g/10 mL, clear, colorless
0.7(at 25℃)
Damp Crystalline Solid or Fused Mass
Yellow to light brown
2 (H2O, 20℃)(saturated solution)
Water Solubility 
Stable. Incompatible with strong oxidizing agents, bases, many organic compounds.
CAS DataBase Reference
98-11-3(CAS DataBase Reference)
EWG's Food Scores
NIST Chemistry Reference
Benzenesulfonic acid(98-11-3)
EPA Substance Registry System
Benzenesulfonic acid (98-11-3)
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H302-H318-H290-H314
Precautionary statements  P260h-P301+P330+P331-P501a-P234-P264-P270-P301+P330+P331+P310-P303+P361+P353+P310+P363-P305+P351+P338+P310-P390-P405-P406-P501-P260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338-P310
Hazard Codes  C
Risk Statements  22-34
Safety Statements  26-36/37/39-45-36
RIDADR  UN 2583 8/PG 2
WGK Germany  1
RTECS  DB4200000
HazardClass  8
PackingGroup  III
HS Code  29041000
Toxicity LD50 orally in Rabbit: 1175 mg/kg

Benzenesulfonic acid price More Price(25)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 8.00468 Benzenesulfonic acid for synthesis 98-11-3 5 g $21.27 2021-03-22 Buy
Sigma-Aldrich 8.00468 Benzenesulfonic acid for synthesis 98-11-3 250 g $76.96 2021-03-22 Buy
Sigma-Aldrich 12635 Benzenesulfonic acid 98.0% (T) 98-11-3 25g-f $77.5 2020-08-18 Buy
Sigma-Aldrich 12635 Benzenesulfonic acid 98.0% (T) 98-11-3 100g-f $222 2020-08-18 Buy
Sigma-Aldrich 8.00468 Benzenesulfonic acid for synthesis 98-11-3 1 kg $239.57 2021-03-22 Buy

Benzenesulfonic acid Chemical Properties,Uses,Production


Benzene sulfonic acid is an organo sulfur compound with the formula C6H5SO3H. It is the simplest aromatic sulfonic acid. It forms colorless deliquescent sheet crystals or a white waxy solid that is soluble in water and ethanol, slightly soluble in benzene and insoluble in carbon disulfide and diethyl ether. It is often stored in the form of alkali metal salts. Its aqueous solution is strongly acidic.

Chemical Properties

green solid


ChEBI: The simplest member of the class of a benzenesulfonic acids that consists of a benzene carrying a single sulfo group.


A white crystalline acid made by sulfonation of benzene. Any further substitution onto the benzene ring is directed into the 3 position.


benzenesulphonic acid: A colourlessdeliquescent solid, C6H5SO2OH,m.p. 43–44°C, usually found as anoily liquid. It is made by treating benzenewith concentrated sulphuricacid. Its alkyl derivatives are used asdetergents.


The alkali metal salt of benzene sulfonic acid was once widely used in the production of phenol :
C6H5SO3Na + 2 NaOH → C6H5ONa + Na2SO3
C6H5ONa + HCl → C6H5OH + NaCl
The process has been largely displaced by the Hock process, which generates less waste. Benzene sulfonic acid is mainly consumed by conversion to other specialty chemicals. A variety of pharmaceutical drugs are prepared as salts of benzene sulfonic acid and are known as besylates or besilates.


Benzene sulfonic acid is prepared from the sulfonation of benzene using concentrated sulfuric acid :
This conversion illustrates aromatic sulfonation, which has been called "one of the most important reactions in industrial organic chemistry.".


Benzene sulfonic acid exhibits the reactions typical of other aromatic sulfonic acids, forming sulfonamides , sulfonyl chloride, and esters. The sulfonation is reversed above 220 °C. Dehydration with phosphorus pentoxide gives benzene sulfonic acid anhydride ((C6H5SO2)2O). Conversion to the corresponding benzene sulfonyl chloride (C6H5SO2Cl) is effected with phosphorus penta chloride. It is a strong acid, being dissociated in water.

Synthesis Reference(s)

The Journal of Organic Chemistry, 61, p. 1530, 1996 DOI: 10.1021/jo9520710
Tetrahedron Letters, 19, p. 1211, 1978 DOI: 10.1016/S0040-4039(01)94501-0

General Description

Deliquescent needles or large plates.

Air & Water Reactions

Slightly soluble in water.

Reactivity Profile

Benzenesulfonic acid reacts with bases and many organic compounds.

Fire Hazard

Flash point data for Benzenesulfonic acid are not available, however Benzenesulfonic acid is probably combustible.

Safety Profile

Poison by ingestion, sbn contact, and probably inhalation. A severe skin and eye irritant. See also SULFATES and SULFONATES.

Purification Methods

Purify benzenesulfonic acid by dissolving it in a small volume of distilled H2O and stirring with slightly less than the theoretical amount of BaCO3. When effervescence is complete and the solution is still acidic, filter off the insoluble barium benzenesulfonate. The salt is collected and dried to constant weight in vacuo, then suspended in H2O and stirred with a little less than the equivalent (half mol.) of sulfuric acid. The insoluble BaSO4 (containing a little barium benzenesulfonate) is filtered off and the filtrate containing the free acid is evaporated in a high vacuum. The oily residue will eventually crystallise when completely anhydrous. A 32% commercial acid is allowed to fractionally crystallise at room temperature over P2O5 in a vacuum desiccator giving finally colourless deliquescent plates m 52.5o. The anhydrous crystalline acid is deliquescent and should be stored over anhydrous Na2SO4 in the dark and should be used in subdued sunlight as it darkens under sunlight. The main impurity is Fe which readily separates as the Fe salt in the early fractions [Taylor & Vincent J Chem Soc 3218 1952]. The S-benzylisothiuronium salt has m 148o (from EtOH/H2O). It is an IRRITANT to the skin and eyes. [See Adams & Marvel Org Synth Coll Vol I 84 1941, Michael & Adair Chem Ber 10 585 1877, Beilstein 11 IV 27.]

Benzenesulfonic acid Preparation Products And Raw materials

Raw materials

Preparation Products

Benzenesulfonic acid Suppliers

Global( 253)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-66670886 China 21067 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22607 55
Shanghai Time Chemicals CO., Ltd.
+8618017249410 +86-021-57951555
+86-021-57951555 CHINA 1365 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 3001 55
career henan chemical co
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Hebei Guanlang Biotechnology Co., Ltd.
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Xiamen AmoyChem Co., Ltd
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Shanghai Longyu Biotechnology Co., Ltd.
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View Lastest Price from Benzenesulfonic acid manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-09-17 Benzenesulfonic Acid
US $10.00 / KG 1KG 99.99 500kg/month Handan Tongyi New Material Technology Co., Ltd
2021-09-07 Benzenesulfonic Acid
US $20.00 / Kg/Drum 25Kg/Drum 99.99% 1 ton per week Wuhan Mulei New Material Technology Co. Ltd
2021-08-18 sulfadiazine
US $100.00 / KG 1KG 99% 9000kg/per week Hebei Lingding Biological Technology Co., Ltd

Benzenesulfonic acid Spectrum

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