Method of producing synthetic pitch
Embodiments of a method are described for modifying pitches, oils, tars, and binders by using these materials as solvents to extract organic chemicals from coal.
1. A method of producing a synthetic binder pitch from coal, comprising:
(a) hydrogenating feedstock solvent in a first tank reactor, wherein the feedstock solvent comprises at least one additional solvent selected from the group consisting of: tetralin, decalin, tetrahydrofuran, and aprotic dipolar solvents such as n-methyl pyrrolidone;
(b) producing a mixture of hydrogenated and unhydrogenated feedstock solvents by combining said hydrogenated feedstock solvent exiting said first tank reactor with unhydrogenated feedstock solvent;
(c) combining said mixture of hydrogenated and unhydrogenated feedstock solvents with coal to produce an extraction mixture in a second tank reactor downstream of said first reactor;
(d) heating said extraction mixture for a period of time sufficient to extract one or more soluble portions of said coal into said mixture of hydrogenated and unhydrogenated feedstock solvents;
(e) removing undissolved solids from said extraction mixture;
(f) removing light hydrocarbons from said extraction mixture, thereby producing the synthetic binder pitch, wherein the synthetic binder pitch comprises a softening temperature between 100 and 120° C. and a coking value between 50 and 60% by weight;
(g) recycling said light hydrocarbons and at least a portion of said mixture of hydrogenated and unhydrogenated solvents to said second tank reactor,
wherein said at least one feedstock solvent comprises a hydrocarbon material having a softening temperature less than about 200° C., and contains at least 10% by weight of hydrocarbon species having a boiling point greater than about 350° C.
2. A method of producing a synthetic binder pitch from coal, comprising:
(a) hydrogenating feedstock solvent in a first tank reactor, wherein the feedstock solvent comprises at least one additional solvent selected from the group consisting of: tetralin, decalin, tetrahydrofuran, and aprotic dipolar solvents such as n-methyl pyrrolidone;
(b) producing a mixture of hydrogenated and unhydrogenated feedstock solvents by combining said hydrogenated feedstock solvent exiting said first tank reactor with unhydrogenated feedstock solvent;
(c) combining said mixture of hydrogenated and unhydrogenated feedstock solvents with coal to produce an extraction mixture in a second tank reactor downstream of said first reactor;
(d) heating said extraction mixture for a period of time sufficient to extract one or more soluble portions of said coal into said mixture of hydrogenated and unhydrogenated feedstock solvents;
(e) removing undissolved solids from said extraction mixture;
(f) removing light hydrocarbons from said extraction mixture, thereby producing the synthetic binder pitch, wherein the synthetic binder pitch comprises a softening temperature between 100 and 120° C. and a coking value between 50 and 60% by weight;
(g) recycling said light hydrocarbons and at least a portion of said mixture of hydrogenated and unhydrogenated solvents to said second tank reactor,
wherein at least 10% of said feedstock solvent comprises products synthesized from gasified coal, gasified biomass, gasified polymer waste, or other gasified carbonaceous material.
3. A method of producing a synthetic binder pitch from coal, comprising:
(a) hydrogenating feedstock solvent in a first tank reactor, wherein the feedstock solvent comprises at least one additional solvent selected from the group consisting of: tetralin, decalin, tetrahydrofuran, and aprotic dipolar solvents such as n-methyl pyrrolidone;
(b) producing a mixture of hydrogenated and unhydrogenated feedstock solvents by combining said hydrogenated feedstock solvent exiting said first tank reactor with unhydrogenated feedstock solvent;
(c) combining said mixture of hydrogenated and unhydrogenated feedstock solvents with coal to produce an extraction mixture in a second tank reactor downstream of said first reactor;
(d) heating said extraction mixture for a period of time sufficient to extract one or more soluble portions of said coal into said mixture of hydrogenated and unhydrogenated feedstock solvents;
(e) removing undissolved solids from said extraction mixture;
(f) removing light hydrocarbons from said extraction mixture, thereby producing the synthetic binder pitch, wherein the synthetic binder pitch comprises a softening temperature between 100 and 120° C. and a coking value between 50 and 60% by weight;
(g) recycling said light hydrocarbons and at least a portion of said mixture of hydrogenated and unhydrogenated solvents to said second tank reactor,
wherein at least 10% of said feedstock solvent comprises products obtained from the pyrolysis of recycled hydrocarbon sources, such as recycled tire rubber, thermoplastics, thermosets, motor oil, grease, and chemical waste.
4. A method of producing a synthetic binder pitch from coal, comprising:
(a) hydrogenating feedstock solvent in a first tank reactor, wherein the feedstock solvent comprises at least one additional solvent selected from the group consisting of: tetralin, decalin, tetrahydrofuran, and aprotic dipolar solvents such as n-methyl pyrrolidone;
(b) producing a mixture of hydrogenated and unhydrogenated feedstock solvents by combining said hydrogenated feedstock solvent exiting said first tank reactor with unhydrogenated feedstock solvent;
(c) combining said mixture of hydrogenated and unhydrogenated feedstock solvents with coal to produce an extraction mixture in a second tank reactor downstream of said first reactor;
(d) heating said extraction mixture for a period of time sufficient to extract one or more soluble portions of said coal into said mixture of hydrogenated and unhydrogenated feedstock solvents;
(e) removing undissolved solids from said extraction mixture;
(f) removing light hydrocarbons from said extraction mixture, thereby producing the synthetic binder pitch, wherein the synthetic binder pitch comprises a softening temperature between 100 and 120° C. and a coking value between 50 and 60% by weight;
(g) recycling said light hydrocarbons and at least a portion of said mixture of hydrogenated and unhydrogenated solvents to said second tank reactor,
wherein at least 10% of said feedstock solvent comprises aromatic oil products obtained from the distillation of shale oil or tar sands.