Coal tar and hydrocarbon mixture pitch and the preparation and use thereof
AssigneeKoppers Delaware, Inc.
InventorWilliam E Saver
Life of this patent
Estimating the term…
Abstract
A method of making a high softening point coal tar pitch using high efficiency evaporative distillation, as well as the uses and applications of such pitch. According to the method, a feed coal tar pitch having a softening point in the range of 70° C. to 160° C. is fed into a processing vessel wherein the processing vessel is heated to a temperature in the range of 300° C. to 450° C. and wherein a pressure inside the processing vessel is in the range of 5 Torr or less. An output coal tar pitch is withdrawn from the processing vessel. The output coal tar pitch has a softening point in the range of 140° C. to 300° C. and has less than 5% mesophase.
Claims30
A method of making a carbon/graphite product comprising:
- providing coal tar pitch having a softening point in the range of about 150° C. to 250° C.;
- providing coke flour;
- mixing the coal tar pitch and coke flour;
- and
- extruding the mixture of coal tar pitch and coke flour.
A carbon/graphite product comprising
- coal tar pitch having a softening point in the range of about 150° C. to 250° C.;
- and
- coke flour.
A carbon/graphite product including coal tar pitch having a softening point in the range of about 150° C. to 250° C.
A method of making a friction product including adding at least 3 wt. % coal tar pitch having a softening point in the range of about 150° C. to 250° C.
A friction product including at least 3 wt. % coal tar pitch having a softening point in the range of about 150° C. to 250° C.
A method of making a saturated aircraft brake preform:
- placing a carbon fiber preform under a vacuum;
- heating the carbon fiber preform;
- introducing coal tar pitch having a softening point in the range of about 160° C.-240° C. into the carbon fiber preform;
- pressurizing the coal tar pitch saturated carbon fiber preform with nitrogen;
- cooling the saturated carbon fiber;
- processing the saturated carbon fiber preform by chemical vapor infiltration.
A saturated aircraft brake preform including coal tar pitch having a softening point in the range of about 160° C.-240° C.
A process of making a compound having natural rubber in the formulation including adding coal tar pitch having a softening point in the range of about 100° C. to 200° C.
A product having natural rubber in the formulation including coal tar pitch having a softening point in the range of about 100° C. to 200° C.
A method of making a mesophase pitch comprising:
- feeding a coal tar pitch having a softening point in the range of about 70° C. to 160° C. into a processing vessel, wherein the processing vessel is heated to a temperature in the range of about 300° C. to 450° C. and wherein the pressure inside the processing vessel is 5 Torr or less;
- obtaining a distillate from said processing vessel, said distillate having a softening point in the range of about 40° C. to 80° C. and being quinoline insoluble free and ash free;
- heat treating said distillate at a temperature range of 400° C. to 455° C. for between 3 and 8 hours.
A mesphase pitch formed from quinoline insoluble free coal tar pitch.
Dependencies are inferred from the claim text.