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Phthalic anhydride (anhydride of phthalic acid) – Plasma Company Ltd. | all.biz
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Phthalic anhydride (anhydride of phthalic acid)

Phthalic anhydride (anhydride of phthalic acid)

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Ukraine, Kharkov
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17 years on Allbiz
Description

Phthalic anhydride represents colourless orthorhombic crystals, almost water-insoluble, sparingly soluble in organic solvents (alcohol, ether, benzene, chloroform, etc.). Possesses properties of aromatic compounds. Easily reacts with phenols and their derivatives. It is easily sublimated.

Phthalic anhydride is received catalytic oxidation of naphthalene (brand B), and also orthoxylol air in gas phase on vanadium - the titanium catalyst (brand A).
Density: 1,527 g/cm ³. Temperature of melting is 130 °C, temperature of boiling is 284 °C.

Chemical formula: C8H4O3.

Phthalic anhydride - reagent for detection and titrimetric definition of the lower primary and secondary aliphatic alcohol, identification of phenols and phenolic resins.

Physical and chemical indicators of the state standard specification 7119-77 phthalic anhydride.
Name of indicator Brand A
premium 1st grade
Appearance Scales and powder of white color or fusion Scales and powder of white color or fusion.
The yellowish or pinkish shade is allowed
Mass fraction of phthalic anhydride, %, not less 99,9 99,7
Crystallization temperature, °C, not below 130,9 130,6
Mass fraction of iron, %, no more 0,0002 0,003
Content of phthalic acid Absence Do not normalize
Mass fraction of maleic anhydride, %, no more 0,05 Do not normalize
Mass fraction of ashes, %, no more 0,002 Do not normalize
Chromaticity of the melted product, Hazen's units, no more:
When releasing
During warranty period for powder and scales
During warranty period for fusion
15
20
Do not normalize
50
80
Do not normalize
Chromaticity of the melted product after heating at 250 °C within 90 min., Hazen's unit, no more:
When releasing
During warranty period for powder and scales
During warranty period for fusion
40
60
Do not normalize
200
Do not normalize
Do not normalize

Safety requirement of phthalic anhydride.
Phthalic anhydride - combustible substance.
Day of fire extinguishing apply sprayed water or air and mechanical foam, at volume suppression - steam or gas means (nitrogen, carbon dioxide). As primary means that sheniye use foam, powder, with carbon dioxide fire extinguishers, and also sand or felt.
Phthalic anhydride on extent of impact on organism belongs to highly hazardous substances (the 2nd class of danger). Maximum allowable concentration in air of working zone - 1 mg/m ³.
During the work with phthalic anhydride it is necessary to provide sealing of the equipment, shipment mechanization, all-exchange, and in places of possible dusting and local exhaust ventilation.
At hit on skin it is processed the wadded tampon moistened in ethyl alcohol then wash out large amount of solution of sodium bicarbonate with mass fraction 1%.

Packaging, transportation and storage.
Phthalic anhydride is packed into four - five - or six-layer paper bags with polyethylene bag insert, into paper bags, plastic bags, into bags from proof fabric with paper bag insert or into specialized soft containers of one-time use for loose products.
Fusion of phthalic anhydride is filled in in railway tanks or in autocontainers. Degree of fullness of tanks and autocontainers is calculated taking into account full use of their loading capacity (capacity). After filling with product the free volume of tanks and autocontainers is filled with nitrogen.
Phthalic anhydride is transported the motor transport in the covered vehicles according to the rules of transportation of goods existing on transport of this look and also sea transport according to safety rules of sea transportation of general loads.
By rail phthalic anhydride is transported povagoino according to "Rules of transportations of dangerous loads".
The phthalic anhydride shipped in metal special containers of the consignor (consignee) is transported by rail in the presence at the consignor (consignee) of specialized load gripping devices and with carrying out loading (unloading) on the access ways the enterprise.
Fusion of phthalic anhydride is transported in the special railway tanks with thermoheating belonging to the consignor according to "Rules of transportation of goods" or in the warmed autocontainers from stainless steel.
The consumer has to warm product in tanks and autocontainers at temperature not above 150 °C.
Phthalic anhydride is stored in packaging of the manufacturer in the closed warehouse.
Warranty period of storage of product - two months from the date of production.

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