Amorphous refractory compositions
AssigneesNippon Oil Co., Ltd., Shinagawa Refractories Co., Ltd.
InventorsSeiichi Uemura, Syunichi Yamamoto, Takao Hirose, Hiroaki Takashima, Osamu Kato, Minoru Nagai
Life of this patent
Estimating the term…
Abstract
An amorphous refractory composition comprising a petroleum-derived binder prepared by feeding a fraction boiling at not lower than 150.degree. C. obtained by thermal or steam cracking of petroleum-derived hydrocarbons, into a first-step agitating vessel where the fraction is heat treated under specific conditions, feeding the thus heat treated fraction into a second-step agitating vessel where it is heat treated under specific conditions and then removing the light fraction from the further heat treated fraction thereby to obtain the petroleum-derived binder.
Claims6
An amorphous refractory composition comprising refractory aggregate and a petroleum-derived binder prepared by:
- providing as the starting oil a fraction boiling at not lower than 150.degree. C., the fraction being obtained by thermal or steam cracking of petroleum-derived hydrocarbons,
- feeding the thus provided fraction continuously into a first-step agitating vessel maintained at a pressure of at least 2 Kg/cm.sup.2 and a temperature of from 300.degree. to 360.degree. C., where the fraction is heat treated for an average residence time of at least 15 minutes,
- withdrawing the first-step treated fraction continuously from the first-step agitating vessel,
- feeding the thus-withdrawn first-step treated fraction continuously into a second-step agitating vessel maintained at a temperature of from 370.degree. to 450.degree. C., where the first-step treated fraction is heat treated for an average residence time of from 30 minutes to 10 hours,
- withdrawing the second-step treated fraction continuously from the second-step agitating vessel and
- removing the light fraction from the second-step treated fraction, thereby to obtain the petroleum-derived binder.
An amorphous refractory composition according to any one of the preceding claims, wherein the binder has a viscosity of 100-10000 cps at 50.degree. C.
Dependencies are inferred from the claim text.