picric acid


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picric acid

(pĭk`rĭk) or

2,4,6-trinitrophenol

(trī'nī'trōfē`nōl), C6H2(NO2)3OH, a toxic yellow crystalline solid that melts at 122°C; and is soluble in most organic solvents. Picric acid is a derivative of phenolphenol
, C6H5OH, a colorless, crystalline solid that melts at about 41°C;, boils at 182°C;, and is soluble in ethanol and ether and somewhat soluble in water. An aromatic alcohol, it exhibits weak acidic properties and is corrosive and poisonous.
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. It reacts with metals to form metal picrates, which like picric acid itself are highly sensitive explosivesexplosive,
substance that undergoes decomposition or combustion with great rapidity, evolving much heat and producing a large volume of gas. The reaction products fill a much greater volume than that occupied by the original material and exert an enormous pressure, which can be
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 that can be detonated by heat, flame, shock, or friction. The high explosives lyddite and melinite are composed mostly of compressed or fused picric acid. Picric acid is often used as a booster to detonate another, less sensitive explosive, such as TNT (trinitrotoluenetrinitrotoluene
or TNT
, CH3C6H2(NO2)3, crystalline, aromatic compound that melts at 81°C;. It is prepared by the nitration of toluene.
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). Although picric acid can be synthesized by nitration of phenol, higher yields are obtained if chlorobenzene is used as a starting material; the latter method involves several steps and the formation of several intermediate products. In addition to its use in explosives, picric acid has been used as a yellow dye, as an antiseptic, and in the synthesis of chloropicrin, or nitrotrichloromethane, CCl3NO2, a powerful insecticide.

Picric Acid

 

(or trinitrophenol), an aromatic nitro compound; it is a high explosive whose properties are similar to those of trinitrotoluene. Pour point, 129°C.

In the first quarter of the 20th century, picric acid was used in ammunition. However, its use has been limited because of the high mechanical sensitivity of its metal salts, which form readily (seePICRATES). Trinitrophenol is obtained by the nitration of phe-noldisulfonic acid using a mixture of nitric and sulfuric acids. It is also obtained from dinitrochlorobenzene, with dinitrophenol as an intermediate, and from benzene under the action of nitric acid and Hg(NO3)2.

REFERENCE

Orlova, E. Iu. Khimiia i tekhnologiia brizantnykh vzryvchatykh veshchestv, 2nd ed. Leningrad, 1973.

picric acid

[′pik·rik ′as·əd]
(organic chemistry)
C6H2(NO2)3OH Poisonous, explosive, highly oxidative yellow crystals with bitter taste; soluble in water, alcohol, chloroform, benzene, and ether; melts at 122°C; used in explosives, in external medicines; to make dyes, matches, and batteries, and to etch copper.
References in periodicals archive ?
Kumar, "Mercury-modulated supramolecular assembly of a hexaphenylbenzene derivative for selective detection of picric acid," Inorganic Chemistry, vol.
Production of picric acid began in October 1915 and averaged 100 tons per week by the end of the year.
Picric acid is a pale yellow, odourless substance used as an antiseptic as well as a military explosive or yellow dye.
The ordnance compound of concern, 2,4,6-TNP (2,4,6-trinitrophenol or picric acid), was considered of priority for this study.
An explosive -- picric acid -- also was not properly packaged for the trip.
Lead, brass and other metals from ammunition along with all the constituents of the propellants, including trinitrotoluene, picric acid, diphenylamine, nitrocellulose, nitroglycerin, potassium nitrate, barium nitrate, tetracene, diazodintrophenol, phosphorus, peroxides, thiocarbamide, potassium chlorate, vinyl fluoride, vinyl chloride, sodium fluoride and sodium sulfate.
The quantity of cardiac glycosides in the raw and treated samples was evaluated using Baljet's reagent (95 ml aqueous picric acid + 5 ml 10 % aqueous NaOH) as described by El-Olemy et al.
The most common wastes produced by labs include: flammable liquids such as acetone; oxidizers such as nitrates; reactives like picric acid; toxins such as cyanides or phenol and corrosives for general lab reactions and mediums.
PICRIC ACID This remedy may be helpful in occipital headaches that arise from mental exertion, grief or depression.
Concerning the precipitate produced in normal urine by picric acid and a new reaction of creatinine, Z.
Instead, they use picric acid as a main charge filler.
Phenol is used in many chemical processes but it is also an ingredient of TNP, or picric acid, an explosive that is sometimes seen in fireworks.