Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Patent
1997-10-27
1999-08-03
Lovering, Richard D.
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
208 38, 208 45, 264 292, 4234475, D01F 9155
Patent
active
059321865
ABSTRACT:
An improved process is disclosed for producing a unique metals-containing anisotropic pitch suitable for carbon fiber manufacture. Soluble, aromatic-organometallic compounds are added to a carbonaceous feedstock which is substantially free of mesophase pitch and the resulting composition is heat soaked to produce an isotropic pitch product containing mesogens and soluble, aromatic-organometallic compounds. Next, the pitch product is solvent fractionated to separate mesogens which contain metals from the organometallic compounds. The metals-containing mesogens are heated to a temperature sufficient to cause fusion to produce a metals-containing mesophase pitch.
In another method, the carbonaceous feedstock is heat soaked to produce an isotropic pitch product containing mesogens and high molecular weight, soluble, aromatic-organometallic compounds are added to the mesogen containing isotropic pitch product prior to solvent fractionation. Metals-containing carbon fibers produced from the mesophase pitch exhibit enhanced stabilization, tensile strength and modulus properties.
Alternatively, the solvent fractionation or separation is conducted under supercritical extraction conditions to produce a metals-containing mesophase pitch. Organometallic compounds may be added to the carbonaceous feedstock either prior to or after the heat soak step.
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McConaghy, Jr. James R.
Rodgers John A.
Romine H. Ernest
Conoco Inc.
Hall William D.
Lovering Richard D.
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