Tetrahydrothiophene

Description

It is the saturated analog of thiophene. It is a volatile, colorless liquid with an intensely unpleasant odor. It is also known as thiophane, thiolane, or THT.T he physical and chemical properties of ethyl mercaptan are presented in Table below. Because of its relatively high vapor pressure (442 mm Hg at 20ºC), ethyl mercaptan has the potential to generate toxic air concentrations very quickly in the event of a spill.

Parameter	Value
Synonyms	THF, tetrahydrofuran, 1,4-epoxybutane, butylene oxide, cyclotetramethylene oxide, oxacyclopentane, diethylene oxide, oxolane, furanidine, hydrofuran, tetra-methylene oxide
CAS registry no.	110-01-0
Chemical formula	C4H8S
Melting point:	-96 °C
Boiling point:	119 °C(lit.)
Density	1 g/mL at 25 °C(lit.)
vapor pressure	18 mm Hg ( 25 °C)
refractive index	n20/D 1.504(lit.)
Flash point:	55 °F
storage temp.	Flammables area
solubility	immiscible
form	liquid
Specific Gravity	1.002 (20/4℃)
PH	7 (H2O, 20℃)
Odor Threshold	0.00062ppm
explosive limit	1.1-12.1%(V)
Water Solubility	immiscible
Stability:	Stability Highly flammable. Vapour-air mixtures explosive in some proportions; note low flash point and fairly wide explosion limit range. Heavier than air, so potentially explosive mixtures may travel considerable distances to source of ignition.

Use

Category	Category Description
Consumer_use	Term applied when the only information the source indicates is ‘consumer’ or ‘consumer product’ ; also applied to terms that the source indicates are f
Food_additive	Includes spices, extracts, colorings, flavors, etc added to food for human consumption
Food_additive, flavor	General flavoring agents used in foods, including condiments and seasonings
Fragrance	Fragrances or odor agents, can be used in home products (cleaners, laundry products, air fresheners) or similar industrial products; usage indicated when known; more specific modifiers included when known
Fuel	General fuels, fuel additives, motor/automotive fuels
Industrial_manufacturing
Manufacturing, chemical	General term used only when the only information known from the source is ‘chemical,’ typically related to manufacturing of chemicals, or laboratory chemicals
Manufacturing, gas	Related to fracking, natural gas, industrial gases
Manufacturing, oil	Crude oil, crude petroleum, refined oil products, fuel oils, drilling oils

Chemical Properties – colourless liquid

General Description

A water-white liquid. About the same density as water and insoluble in water. Flash point near 20°F. Vapors heavier than air. Used as a solvent and to make other chemicals.

Air & Water Reactions

Highly flammable. Insoluble in water.

Reactivity Profile

Organosulfides, such as Tetrahydrothiophene, are incompatible with acids, diazo and azo compounds, halocarbons, isocyanates, aldehydes, alkali metals, nitrides, hydrides, and other strong reducing agents. Reactions with these materials generate heat and in many cases hydrogen gas. Many of these compounds may liberate hydrogen sulfide upon decomposition or reaction with an acid. Slow addition of hydrogen peroxide to the thiophene resulted in explosions on three occasions, Chem. Eng. News, 1974, 52(39), 3.

Health Hazard

May cause toxic effects if inhaled or absorbed through skin. Inhalation or contact with material may irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.

Fire Hazard

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

Safety Profile

Mildly toxic by inhalation. Flammable liquid. Potentially explosive reaction with hydrogen peroxide. When heated to decomposition it emits toxic fumes of SOx.