Chlorosulfonic Acid

chlorosulfonic acid

[¦klȯr·ō·səl′fän·ik ′as·əd]
(inorganic chemistry)
ClSO2OH A fuming liquid that decomposes in water to sulfuric acid and hydrochloric acid; used in pharmaceuticals, pesticides, and dyes, and as a chemical intermediate.

Chlorosulfonic Acid

 

SO2Cl(OH), a monochloroanhydride of sulfuric acid. A colorless, mobile liquid, chlorosulfonic acid has a melting point of – 80°C, a boiling point at atmospheric pressure of 155°C (with decomposition), and a density of 1.75 g/cm3. It is chemically very reactive. It reacts vigorously with water, forming sulfuric and hydrochloric acids, and it fumes in the presence of atmospheric moisture. It also reacts with many organic and inorganic compounds. Chlorosulfonic acid is produced by the reaction of hydrogen chloride with sulfur trioxide: HCl + SO3 = SO2Cl(OH). In the absence of moisture, it can be stored and transported in steel containers. Chlorosulfonic acid is used in the production of dyes, detergents, and drugs; it is also used as a smoke producer.

L. M. IAKIMENKO

References in periodicals archive ?
The sulfonation is carried out in the presence of well-known reagents such as sulfuric acid [11], trimethylsilyl chlorosulfate [12], and chlorosulfonic acid [13].
Acid spun CNT electrodes were dissolved in chlorosulfonic acid without the use of sonication, surfactants, or polymer coatings that would serve as impurities.
Mokhtary, "Polyvinylpolypyrrolidone-supported chlorosulfonic acid: an efficient catalyst for one-pot synthesis of dihydropyrimidinones and octahydroquinazolin-2,5-diones," Polycyclic Aromatic Compounds, vol.
One proposal suggested injecting chlorosulfonic acid, a highly corrosive and toxic substance, into the engine exhaust.
[6] found that acid catalysis was a process of autocatalysis when using chlorosulfonic acid as an enolizing agent.
During the next few years, the company tested smoke pots, smoke candles, and smoke dispensers filled with sulfur trioxide in chlorosulfonic acid (FS) to establish operational doctrine.
The chemicals purchased from Sigma-Aldrich, Fluka, or Merck companies include anhydrous methanol (>99.8%), 1-methylimidazole (>99%), sulfuric acid (97%), imidazole (>99.8%), chlorosulfonic acid (99.0%), dichloromethane (>99.8%), n-hexane (>99%), KOH (analytical grades), ethyl acetate, and diethyl ether.
The next big breakthrough came in 2009, when Talmon, Pasquali and colleagues discovered the first true solvent for nanotubes -- chlorosulfonic acid. For the first time, scientists had a way to create highly concentrated solutions of nanotubes, a development that led to improved alignment and packing.
The researchers have reported that chlorosulfonic acid can dissolve half-millimeter-long nanotubes in solution, a critical step in spinning fibres from ultralong nanotubes.
Chlorosulfonic acid (2.32 mL, 0.02 mol) was added drop wise into the mixture of compound 5 (3.36 g, 0.01 mol) and catalytic amount of [P.sub.2] [O.sub.5] over 30 minutes with constant stirring at 0-5[degrees]C.
Synthesis of the sulfuric acid monoester from epoxidized methyl ester is accomplished by the reaction of epoxidized methyl esters with chlorosulfonic acid in pyridine solution.
LC-MS analysis was performed in the negative ion mode, with selected ion monitoring of the pseudomolecular ions at m/z 125 for ETS ([M.sub.r] 126.1) and m/z 130 for ETS-[D.sub.5] (pentadeuterated internal standard, prepared by reaction of ethanol-[D.sub.6] with chlorosulfonic acid; Sigma-Aldrich) and at m/z 221 and m/z 226 for EtG ([M.sub.r] 222.1) and EtG-[D.sub.5] (internal standard; Medichem Diagnostics), respectively.