PHOSPHORUS SESQUISULFIDE Property

Melting point:

172.5°

Boiling point:

bp 407.5°

Density 

d420 2.03

vapor pressure 

0Pa at 25℃

solubility 

insoluble in H2O; soluble in benzene; very soluble in CS2

form 

solid

color 

yellow-green orthorhombic crystals, crystalline

Water Solubility 

29.3mg/L at 20℃

EPA Substance Registry System

3,5,7-Trithia-1,2,4,6-tetraphosphatricyclo[2.2.1.02,6]heptane (1314-85-8)

Safety

Hazard Codes 

F,Xn,N

Risk Statements 

11-22-50

Safety Statements 

7-16-24/25-61

RIDADR 

1341

RTECS 

TH4330000

HazardClass 

4.1

PackingGroup 

II

Hazardous Substances Data

1314-85-8(Hazardous Substances Data)

Toxicity

rabbit,LDLo,oral,95mg/kg (95mg/kg),BEHAVIORAL: FOOD INTAKE (ANIMAL)KIDNEY, URETER, AND BLADDER: OTHER CHANGES IN URINE COMPOSITIONKIDNEY, URETER, AND BLADDER: CHANGES IN BOTH TUBULES AND GLOMERULI,Skandinavisches Archiv fuer Physiologie. Vol. 15, Pg. 259, 1904.

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H228Flammable solid

H260In contact with water releases flammable gases which may ignite spontaneously

H302Harmful if swallowed

H400Very toxic to aquatic life

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P223Keep away from any possible contact with water, because of violent reaction and possible flash fire.

P231+P232Handle under inert gas. Protect from moisture.

P240Ground/bond container and receiving equipment.

P241Use explosion-proof electrical/ventilating/lighting/…/equipment.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P330Rinse mouth.

P335+P334Brush off loose particles from skin. Immerse in cool water/wrap in wet bandages.

P370+P378In case of fire: Use … for extinction.

P391Collect spillage. Hazardous to the aquatic environment

P402+P404Store in a dry place. Store in a closed container.

P501Dispose of contents/container to..…

PHOSPHORUS SESQUISULFIDE Chemical Properties,Usage,Production

Chemical Properties

Yellowish-green crystals; long rhombic needles; melts at 172°C (341°F); boils at 407–408°C (764–766°F);density 2.03 at 20°C (68 °F); soluble in carbon disulfide, benzene, and toluene, reacts with water.
Stable in the air. In the absence of O2 and moisture, remains stable above 700°C. Decomposed by water at elevated temperatures, evolving H3S. Soluble in CS3 and benzene. These solutions become turbid in air almost immediately and gradually deposit a copious, yellowish-white precipitate

Uses

Phosphorus sesquisulfide is used in in match tips.

Uses

In match tips.

Uses

Phosphorus sesquisulfide is used in making safety matches.

General Description

A yellow crystalline solid. Easily ignited by friction. Forms sulfur dioxide and phosphorus pentaoxide during combustion. Reacts with water to form phosphoric acid, a corrosive material. Used to make matches and in the manufacture of other chemicals.

Air & Water Reactions

Highly flammable.Slowly decomposed by water to form phosphoric acid and toxic hydrogen sulfide gas (H2S). May ignite on contact with water or moist air.

Reactivity Profile

PHOSPHORUS SESQUISULFIDE is a reducing agent.

Health Hazard

Highly toxic: contact with water produces toxic gas, may be fatal if inhaled. Inhalation or contact with vapors, substance or decomposition products may cause severe injury or death. May produce corrosive solutions on contact with water. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.

Health Hazard

Phosphorus sesquisulfide exhibited low to moderate acute oral toxicity in animals. An oral dose lethal to rabbits was reported to be 100 mg/kg (NIOSH 1986). Because of its low vapor pressure, any health hazard due to inhalation of this compound in the work place should be very low. There is no report on its acute inhalation toxicity. Its vapors may produce irritation of respiratory passage. Skin contact may cause mild irritation. It produces toxic sulfur dioxide on burning.

Fire Hazard

Produce flammable and toxic gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Containers may explode when heated. Runoff may create fire or explosion hazard.

Flammability and Explosibility

Flammable

Safety Profile

Poison by ingestion. Flammable by spontaneous ignition. When heated to decomposition it emits very toxic fumes of POx and SOx. See also SULFIDES and PHOSPHORUS.

Synthesis

Phosphorus trisulfide can be synthesized either by Stock's method (I), which involves fusing red P and S and carefully purifying the crude product by recrystallization from CS3, followed by a second recrystallization from benzene, or according to German patent 309,618 (F. C. Frary), which uses white P in a high-melting inert solvent (II).
4 P + 3 S = P4S3

Purification Methods

Extract P4S3with CS2, filter it and evaporate it to dryness. Alternatively place it in H2O, and pass steam through it for an hour. The H2O is then removed, the solid is dried, and recrystallised from CS2 [Rogers & Gross J Am Chem Soc 74 5294 1952].

Waste Disposal

An alkaline solution is treated with laundry bleach, allowed to stand overnight, neutralized, and washed down the drain with plenty of water.