- Country of manufactureUkraine
The purified naphthalene produced at phenolic plant from the pressed naphthalene by formaldehyde cleaning with the subsequent rectification on structure is close to binary mixture naphthalene - thionaphthene. Other impurity make about 5% of impurity (fig. 1) therefore significantly do not influence behavior of system. It is reached thanks to deep chemical refining and effective rectification on column with 60 plates.
The purified naphthalene from mixing pipettes is issued in the reception collection 8 equipped with coil for heating indirect steam. Crystallization temperature of the purified naphthalene has to be not lower than 79 4 C. The naphthalene received after such cleaning is transferred z rectifying department.
Rectification of the purified naphthalene is made the installations of periodic action working under vacuum. The purified naphthalene has speed.
Rectification of the purified naphthalene owing to its high temperature of boiling is made under vacuum and can be carried out in devices of periodic or continuous action.
Rectification of the purified naphthalene owing to its high temperature of boiling is made under vacuum, usually in devices of periodic action.
As indicator of quality of the purified naphthalene also the content of thionaphthene can serve if it to carry out definition by the simplified and rather exact method.
The main indicator of quality of all grades of the purified naphthalene characterizing the maintenance of the main component and impurity is crystallization temperature. Feature of rectification of the purified naphthalene is that products of alkylation of naphthalene and thionaphthene, and also condensation products with formaldehyde are thermally unstable. For receiving the purified naphthalene the technical (pressed) product is subjected to sulphuric acid processing and the subsequent rectification.
The raw or the purified naphthalene (except the naphthalene in flux transported in tanks) transport naphthalene in sealed wooden or metal containers, in boxes from strong cardboard and in bags from fabric, four-layer paper and noninflammable plastic.