PURPOSE: To prepare raw material pitch giving a carbon fiber with high modulus of elasticity, by solvent extraction of a distillations residue obtd. by removing high-boiling fractions from a hydrotreated heavy petroleum residual oil followed by heat treatment of the extracted component.
CONSTITUTION: A heavy petroleum residual oil consisting of a fraction boiling above 300°C is hydrotreated in the presence of a catalyst at a temp. of 370W 450°C, a pressure of 70W210kgf/cm2, a liquid space velocity of 0.4W2.0Hr-1, a hydrogen/oil ratio of 700W1,700Nm3/kl, and, after a component such as S, N, O or a trace of a metal in the residual oil is removed, a low-boiling fraction boiling below 450°C is removed by vacuum distillation. Then the vacuum distillation residue is subjected to solvent extraction with an org. solvent such as propane at a solvent/oil ratio fo 3W15:1, a temp. of 50W230°C and a pressure of 5W50kgf/cm2, and the extracted component is thermally treated at 390W 430°C.
MORIYA KUNIHIKO
TATE KAZUHITO
MUROGA GOROU
YANAGIDA KAZUHIRO
NAKAMURA YOSHIKAZU
INOUE AKIYOSHI
AZUMA MASAHIRO
| JPS4919127A | 1974-02-20 | |||
| JPS57179286A | 1982-11-04 | |||
| JPS5112740A | 1976-01-31 | |||
| JPS5089636A | 1975-07-18 |