Changzhou Junchi Chemical Co., Ltd.

Benzene sulfonic acid

Chinese Synonyms: benzene sulfonic acid, benzene sulfonic acid (40% solution), benzene sulfonic acid, 94%; benzene sulfonic acid 80%; benzene sulfonic acid, TECH. CA 75% W/W AQ. SOLN.; anhydrous benzene sulfonic acid; benzene sulfonic acid 70%; benzene sulfonic acid (1.5H2O)

English Name: Benzenesulfonic acid

English synonyms: 17-120a; acidebenzenesulfonique; Benzenemonosulfonic acid; benzenemonosulfonicacid; Benzenesulfonicacid (40%solu; Besylic acid; besylicacid; Kyselina benzensulfonova)

CAS number:

98-11-3

Molecular formula: C6H6O3S

Molecular weight: 158.18

EINECS: 202-638-7

Related categories: Intermediates of Dyes and Pigments; Organic AcidsOrganic Building Blocks; Sulfonic/Sulfinic Acids; Sulfur Compounds; Chemical Synthesis; Organic Acids; Synthetic Reagents; pharmaceutical intermediates; aromatics; organic blocks; other biochemical reagents

Mol file: 98-11-3.mol

Properties of benzene sulfonic acid

Melting point 30-60 C

Boiling point 137

Density 1.32

Flash point >230 degree F

Water soluble soluble

Sensitive Hygroscopic

Merck 141070

BRN 742513

Stability Stable. Incompatible with strong oxidizing agents, bases, many organic compounds.

CAS database 98-11-3 (CAS DataBase Reference)

NIST chemical information Benzenesulfonic acid (98-11-3)

EPA chemical information Benzenesulfonic acid (98-11-3)

Application and synthesis of benzene sulfonic acid

Colorless or leaflike crystals of chemical properties. It is easy to dissolve in water and ethanol, insoluble in ether and carbon disulfide, slightly soluble in benzene.

Uses are mainly used in the production of phenol by alkali, and also for the production of resorcinol, etc., and are usually used as catalysts in esterification and dehydration reactions

It is used as an experimental reagent and catalyst, as well as organic synthesis and phenol manufacture

The application of benzene sulfonic acid in oilfield water injection can remove formation plugging and improve formation permeability. As the acid of acid injection well, benzene sulfonic acid is characterized by slow reaction with carbonate, greater concentration, slower reaction speed and more acidification. Compared with hydrochloric acid, benzene sulfonic acid (and mixed aromatic sulfonic acid) has a long effective period, small corrosion and safe use. Benzene sulfonic acid is also used as catalyst for esterification and dehydration, as well as curing agent in foundry industry.

Test of ammonium salt and potassium salt. Determination of zinc. Organic synthesis. Manufacture of phenol and resorcinol. Catalyzer It can be used as dehydration catalyst, resin curing agent and electroplating additive, and also can be used as dye intermediate.

The production method is based on benzene as raw material and sulfonated by sulfuric acid. 93% 2400L sulfuric acid added sulfonation pot, benzene 2500-3000L/h to flow into the evaporator through evaporation and temperature for overheating overheating of benzene vapor above 150 DEG C, by bubbling reaction in sulfuric acid layer, the temperature at about 170 DEG C, the free acid control in 4-5%. After about 10h or so to complete the reaction of benzene vapor and water vapor generated by condensation reaction without separation, acid benzene by alkali neutralization, dehydration after salt recycling. Removal of benzene from benzene containing benzene sulfonic acid by vacuum benzene removal unit. The yield of sulfonation was 96.5%. Benzene sulfonic acid is neutralized by sodium sulfite or sodium hydroxide, and then sodium benzene sulfonate is obtained. The neutralization yield was 99%. Raw material consumption quota: benzene 600kg/t and fuming sulfuric acid 750kg/t.

Category toxic substances

Toxicity classification high toxicity

Acute oral toxicity in rats LD50: 980 mg / kg; oral LD50: 75 mg / kg - wild birds

Stimulation data skin - Rabbit 2 mg /24 h severe; eye rabbit 0.25 mg /24 h severe

Flammable hazardous properties flammable; burning produces toxic sulfur oxides smoke

Storage and transportation characteristics, low temperature drying ventilation, and storage of food raw materials separately

Fire extinguishing agent dry powder, foam, sand, carbon dioxide, fog water

security information

Dangerous goods sign C

Dangerous category code 22-34

Security instructions 26-36/37/39-45-36

Dangerous goods transport number UN 2583 8/PG 2

WGK Germany 1

RTECS DB4200000

TSCA Yes

HazardClass 8

PackingGroup III

Customs code 29041000

Toxic substances data 98-11-3 (Hazardous Substances Data)