Starting pitches for carbon fibers

• US 4,521,294 A
• Filed: 04/09/1982
• Issued: 06/04/1985
• Est. Priority Date: 04/13/1981
• Status: Expired due to Term

• Current Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Original Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Inventors: Kato, Osamu, Takashima, Hiroaki, Yamamoto, Shunichi, Uemura, Seiichi, Hirose, Takao
• Primary Examiner(s): Gantz, D. E.
• Assistant Examiner(s): Myers, Helane
• Application Number:
  US06/366,937
• Time in Patent Office: 1,152 Days
• Field of Search: 208/23, 208/40, 423/447.2, 423/447.6, 423/447.4, 423/449
• US Class Current: 208/23
• CPC Class Codes: C10C 3/00 Working-up pitch, asphalt, bitumen compositions of asphalts and other bitumenous materials C08L95/00
• CPC Class Codes: D01F 9/155 from petroleum pitch
• CPC Class Codes: D01F 9/322 for manufacturing filaments from pitch

Abstract

A starting pitch for carbon fibers, obtained by (A) mixing together (1) a heavy fraction oil boiling at not lower than 200° C. obtained at the time of fluidized catalytic cracking of petroleum, (2) a hydrogenated oil selected from aromatic hydrocarbons of 2-10 rings having their nuclei partly hydrogenated and specific fractions boiling at 160°-650° C. and containing such aromatic hydrocarbons and (3) a heavy fraction oil boiling at not lower than 200° C. obtained at the time of steam cracking of petroleum, to form a mixture of the oils (1), (2) and (3), and then (B) heat treating the thus formed oil mixture at 370°-480° C. and 2-50 Kg/cm².G thereby to obtain the starting pitch.

Claims

1. A starting pitch for carbon fibers, obtained by (A) mixing together 100 parts by volume of (1) a heavy fraction oil boiling at not lower than 200°

C. obtained by fluidized catalytic cracking of petroleum with 10-200 parts by volume of (2) a hydrogenated oil selected from the group consisting of (a) aromatic nucleus-hydrogenated hydrocarbons prepared from aromatic hydrocarbons of 2-10 rings by hydrogenating the nuclei thereof, (b) a hydrogenated oil obtained by contacting a fraction boiling at 160°

-650°

C. obtained at the time of steam cracking of petroleum and/or a fraction boiling at 160°

-650°

C. obtained at the time of heat treating at 370°

-480°

C. a heavy fraction oil boiling at not lower than 200°

C. obtained at the time of steam cracking of petroleum, with hydrogen in the presence of a hydrogenating catalyst to hydrogenate 10-70% of the aromatic nuclei of aromatic hydrocarbons contained in said fraction boiling at 160°

-650°

C. and (c) a hydrogenated oil obtained by contacting a fraction boiling at 160°

-650°

C. produced at the time of preparing the starting pitch by heat treatment, with hydrogen in the presence of a hydrogenating catalyst to hydrogenate 10-70% of the aromatic nuclei of aromatic hydrocarbons contained in said fraction boiling at 160°

-650°

C., to form a mixture of the oils (1) and (2), and then (B) heat treating the thus formed oil mixture at 370°

-480°

C. under a pressure of 2-50 Kg/cm².G, the starting pitch so obtained being heat treated to produce a precursor pitch which is melt spun, infusibilized, carbonized or graphitized to obtain the carbon fibers.

3. A starting pitch for carbon fibers according to claim 1 or 2, wherein the hydrogenated oil (2)(c) is a hydrogenated oil prepared by collecting a fraction boiling at 160°

-650°

C. at the time of fluidized catalytic cracking of petroleum and hydrogenating the thus collected fraction to effect 10-70% nuclear hydrogenation therein, a hydrogenated oil prepared by collecting a fraction boiling at 160°

-650°

C. at the time of heat treating the heavy fraction oil (1) at 370°

-480°

C. and hydrogenating the thus collected fraction to effect 10-70% nuclear hydrogenation therein or a hydrogenated oil prepared by collecting a fraction boiling at 160°

-650°

C. produced at the time of heat treating a heavy fraction oil boiling at not lower than 200°

C. obtained at the time of fluidized catalytic cracking of petroleum and hydrogenating the thus collected fraction to effect 10-70% nuclear hydrogenation therein.

4. A starting pitch for carbon fibers according to claim 1, wherein the heavy fraction oil (1) and the hydrogenated oil (2) are mixed together in a mixing ratio by volume of 1:

0.1-2.

6. The starting pitch according to claim 1 wherein the heavy fraction oil (1) boils at 200°

-700°

C.

2. A starting pitch for carbon fibers, obtained by (A) mixing together 100 parts by volume of (1) a heavy fraction oil boiling at not lower than 200°

C. obtained at the time of fluidized catalytic cracking of petroleum with 10-200 parts by volume of (2) a hydrogenated oil selected from the group consisting of (a) aromatic nucleus-hydrogenated hydrocarbons prepared from aromatic hydrocarbons of 2-10 rings by hydrogenating the nuclei thereof, (b) a hydrogenated oil obtained by contacting a fraction boiling at 160°

-650°

C. obtained at the time of steam cracking of petroleum and/or a fraction boiling at 160°

-650°

C. obtained at the time of heat treating at 370°

-480°

C. a heavy fraction oil boiling at not lower than 200°

C. obtained at the time of steam cracking of petroleum, with hydrogen in the presence of a hydrogenating catalyst to hydrogenate 10-70% of the aromatic nuclei of aromatic hydrocarbons contained in said fraction boiling at 160°

-650°

C. and (c) a hydrogenated oil obtained by contacting a fraction boiling at 160°

-650°

C. produced at the time of preparing the starting pitch by heat treatment, with hydrogen in the presence of a hydrogenating catalyst to hydrogenate 10-70% of the aromatic nuclei of aromatic hydrocarbons contained in said fraction boiling at 160°

-650°

C. and (3) a heavy fraction oil boiling at not lower than 200°

C. obtained at the time of steam cracking of petroleum, to form a mixture of the oils (1), (2) and (3), and then (B) heat treating the thus formed oil mixture at 370°

-480°

C. under a pressure of 2-50 Kg/cm².G thereby to obtain the starting pitch for carbon fibers, the starting pitch so obtained being heat treated to produce a precursor pitch which is melt spun, infusibilized, carbonized or graphitized to obtain the carbon fibers.

5. A starting pitch for carbon fibers according to claim 2, wherein the heavy fraction oil (3) and the heavy fraction oil (1) are mixed together in a mixing ratio by volume of 1:

0.1-9, and at the same time the hydrogenated oil (2) is mixed with the heavy fraction oils (1) and (3) in a mixing ratio by volume of 0.1-2 between the oil (2) and the sum of the oils (1) and (3).