Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1980-11-17
1983-08-02
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
422135, 422136, 526 71, 528214, C08G 6538, C08G 6546
Patent
active
043967574
ABSTRACT:
A process for preparing polyphenols, including oxidative polycondensation of a phenol in an aqueous medium in the presence of an oxidizer as well as a subsequent separation of the end product. The starting phenol is mixed with an aqueous solution of an alkali of 5 to 56% concentration in a molar ratio between 1:2.4 and 1:0.25 and heated to a temperature between 70.degree. and 170.degree. C., while air, which furnishes oxygen as the oxidizer, is passed through the reaction mixture.
An apparatus for carrying out the process of the invention comprises a kettle equipped with a heater, a shaft with blades mounted within said kettle and connected to a drive for revolving the shaft, a perforated pipe assembled at the bottom portion of the kettle and communicating with an air blower. The perforated pipe communicates with the air blower through an air treatment chamber.
REFERENCES:
patent: 3025264 (1962-03-01), Lind
patent: 3573257 (1971-03-01), Nakashio et al.
patent: 3804865 (1974-04-01), Rutledge
patent: 4065434 (1977-12-01), Rutledge
patent: 4237265 (1980-12-01), Eliassen et al.
Amrullaev Amrulla F. O.
Mamedova Anush G. K.
Ragimov Adalat V. O.
Ragimov Ibragim I. O.
Rustamov Yavus I. O.
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