CN102392328A - Method for intensively producing carbon fiber raw material by coal pitch needle coke - Google Patents
Method for intensively producing carbon fiber raw material by coal pitch needle coke Download PDFInfo
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- CN102392328A CN102392328A CN2011102508819A CN201110250881A CN102392328A CN 102392328 A CN102392328 A CN 102392328A CN 2011102508819 A CN2011102508819 A CN 2011102508819A CN 201110250881 A CN201110250881 A CN 201110250881A CN 102392328 A CN102392328 A CN 102392328A
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Abstract
The invention provides a method for intensively producing a carbon fiber raw material by coal pitch needle coke. The method comprises the following steps of: reacting a benzene insoluble substance and quinoline soluble substances BI and QS (Beta component) in the intensive production of the coal pitch needle coke at high temperature through hydrogen solvent oil with high H/C ratio; and processing into anisotropic carbon fiber. The obtained carbon fiber has the properties, such as high modulus, high strength, light weight, corrosion resistance and the like. The method is suitable for the carbon fiber intensively produced by the coal pitch needle coke and separation and processing utilization of raw material components of a fire-resisting material binder; compared with the single needle coke production, the coal pitch intensive technology is more reasonable and lower in cost, the quality production of the needle coke is ensured, the resource is comprehensively utilized, auxiliary products are increased, the production cost is lowered, and the added value is improved.
Description
Technical field
The present invention relates to the method that carbon fiber material is produced in a kind of tar needle-shape coke intensification, belong to material with carbon element preparation and applied technical field.
Background technology
Carbon fiber has characteristics such as high-modulus, high strength, lightweight, corrosion-resistant, electric conductivity, x-ray penetrability, and its purposes is very extensive.At present; Except that global well-known asphalt base carbon fiber manufacturing firm such as U.S. Cytec company, Japanese Petoca Materials Co., Ltd, Mitsubishi Chemical Ind and Saudi Arabia Kurcha company; " Shanghai Dong Dao carbon element chemical industry " also produced the asphalt base carbon fiber raw material, but its crucial spinning technique then has been placed in Japan.In recent years " the grand chemical industry of Yan ore deposit state " studied with the active ingredient in the solvent extraction coal dust; And to extract filter, after hydrogenation polymerization etc. handles; Obtain softening point and be 230 ℃ pitch; Through further processing modulation, promptly become spinnable asphalt base carbon fiber, and existing publication number is that the application for a patent for invention of CN101624730A is open; Henan coal industry chemical industry group forever coal kiloton carbon fiber project in end of last year success output MH300 high-performance carbon fibre product.
The coal tar pitch carbon fiber mainly is divided into isotropic pitch base carbon fibre (general purpose grade carbon fiber), each diversity asphalt base carbon fiber (high-performance carbon fibre, mesophase pitch-based carbon fibers).Wherein isotropic pitch base carbon fibre raw material sources are wide, and range of molecular weight distributions is wide, but generally all can not directly be used for spinning; And can directly be used for the anisotropy asphalt base carbon fiber of spinning, again to a quinoline insolubles (QI in the raw material
1) content and secondary quinoline insolubles (QI
2) viscosity etc. the strict requirement of comparison is arranged.
Summary of the invention
For in production high-quality needle coke; Can bad plasticity, resins that caking property is strong be become the raw material of each diversity asphalt base carbon fiber; With further production high-performance carbon fibre, the method that the present invention provides a kind of tar needle-shape coke intensification to produce carbon fiber material is to guarantee the high-quality production of needle coke; Reduce production costs again simultaneously, improve its added value.
The present invention is to provide the method that carbon fiber material is produced in a kind of like this tar needle-shape coke intensification, it is characterized in that comprising following each step:
A. get raw material by the prescription of following mass percent:
Coal tar pitch 30～50%
Modified coal-tar 40～50%
Conditioning agent 5.5～19.5%
Nickel, vanadium, cobalt remove agent 1.0～10.5%;
B. the raw material with steps A is 50～200 ℃ in temperature; Speed is to separate under the condition of 10～50mm/min; Obtain bottom separator and top separator, bottom separator wherein send the fire bond operation, is prepared into fire bond by routine;
C. the B step is separated the top separator obtain through centrifugation, the solvent naphtha product on upper strata, and middle level thing and lower floor's thing, the middle level thing send the needle coke production process as the maltha raw material, is prepared into the needle coke product by routine;
D. separate in the lower floor's thing that obtains at step C; Press the mass ratio of hydrogen supply dissolvent You ︰ raw material=0.5 ︰ 1; With the amount of 0.1L～0.8L/min, feeding the H/C ratio is the hydrogen supply dissolvent oil of 0.5 ︰ 2.0 ~ 1.5, under the effect of hydrogen supply dissolvent oil; In 300～460 ℃ of thermotonuses 3～10 hours, each diversity asphalt base carbon fiber raw material.
Modified coal-tar in the said steps A obtains through following method: with the by-product oil of coal tar and needle coke delayed coking drums; After pressing the mass ratio mixing of Mei Jiao You ︰ by-product oil=0.5～1 ︰ 1～3; The amount of pressing 1L～5L/min feeds technical grade hydrogen in the miscella, is that 350～460 ℃, pressure are that 0.1～5Mpa, oil gas speed ratio are 0.1～3.0h in temperature
-1, catalyst is γ-Al
2O
3, the ZSM-5 molecular sieve condition under react 3～15h after, promptly obtain modified coal-tar.
Conditioning agent in the said steps A is that aromatization degree BMCI is 30～75 conditioning agent; Form by in the following organic matter one or more: crude benzol, toluene, heavy benzol, kerosene, diesel oil, ethylene glycol, propylene glycol, aromatic solvent naphtha, washing oil, carbolineum, take off aromatic solvent naphtha; Wherein, aromatization degree BMCI is drawn by computes:
BMCI=?48640/Tb,m+473.6d-456.8
In the formula, Tb, m are raw material boiling point mean value, and unit is K;
D is the density of raw material when 288.5K, and unit is kg/m
3
Conditioning agent preferred fragrance degree BMCI in the said steps A is 55 ~ 70 conditioning agent.
Coal tar pitch in the said steps A is a mid temperature pitch, is the lighting coal tar by coal needle coke delay coking process by-product.
Nickel in the said steps A, vanadium, cobalt remove agent and obtain according to " N-methylimidazole preparation method of ionic liquid "; The list of references of this method is: Shanghai University Of Electric Power's journal; 2010 (1), the 61-65 page or leaf is by Liu Kejia; " the synthetic and purification of the microwave method of alkyl imidazole ionic liquid " that Li Xiaohua, people such as Wang Luochun deliver.
The separation of said B step is accomplished in conventional settlement separator; The centrifugation of said C step is accomplished on conventional three sections whizzers; The separation of perhaps said B step, C step is in the separator that is combined into by sedimentation separation machine and three sections whizzers, to accomplish.
The hydrogen supply dissolvent oil of said D step is oxolane, polyethylene glycol, take off a kind of in aromatic solvent naphtha, the circulating solvent oil, perhaps wherein any three kinds.
Each diversity asphalt base carbon fiber raw material of said D step gained is 0.01 ~ 0.05ml/min with conventional NK-MZ01 nonwoven production device in air mass flow, technical grade SO
2Flow is 0.001 ~ 0.05ml/min,, technical grade NH
3Flow is under the condition of 0.001 ~ 0.03ml/min, does not melt pre-oxidation, oxidized activating by routine, after the carbonization reaction of molten asphalt fiber, does not process young's modulus and reaches 175 ~ 190Gpa, and elongation at break is each diversity carbon fiber of 0.7 ~ 1.0%.
Effect of the present invention and advantage: adopt such scheme, can utilize the lower floor's thing separated in the tar needle-shape coke intensification production process easily, promptly contain benzene insoluble and quinoline DDGS
BIWith
QS (βComponent) component under the oily effect, makes the progressively cracking of core aromatic hydrocarbons structure than hydrogen supply dissolvent at high H/C; Form the product of cycloalkanes structure; Bridged bond breaks to form scarce hydroperoxyl radical simultaneously, and polycondensation generates the more anisotropy asphalt base carbon fiber raw material of macromolecule each other, passes through the production technology and the device of conventional nonwoven fabric again; Process each diversity asphalt base carbon fiber, and the gained carbon fiber have high-modulus, high strength, lightweight, performance such as corrosion-resistant.The present invention is more reasonable than single needle coke production, and cost is lower, has both guaranteed the high-quality production of needle coke, has fully utilized resource again, increases auxiliary product, reduces production costs, and improves added value.
The specific embodiment
Below in conjunction with embodiment the present invention is done and to further describe.
Embodiment 1
A. get raw material by the prescription of following mass percent:
Coal tar pitch 50%
Modified coal-tar 40%
Conditioning agent 8.5%
Nickel, vanadium, cobalt remove agent 1.5%;
Wherein, Said modified coal-tar obtains through following method: with the by-product oil of coal tar and needle coke delayed coking drums; After pressing the mass ratio mixing of Mei Jiao You ︰ by-product oil=0.5 ︰ 2; The amount of pressing 1L/min feeds technical grade hydrogen, is that 350 ℃, pressure are 3Mpa, time to be that 12h, oil gas speed ratio are 3.0h in temperature
-1, catalyst is γ-Al
2O
3, the ZSM-5 molecular sieve condition under the reaction after, promptly obtain modified coal-tar; Said conditioning agent is that aromatization degree BMCI is 55 conditioning agent, is made up of following organic matter: crude benzol, toluene, heavy benzol, kerosene, diesel oil; Said coal tar pitch is a mid temperature pitch, is the lighting coal tar through coal needle coke delay coking process by-product; Said nickel, vanadium, cobalt remove agent and obtain according to " N-methylimidazole preparation method of ionic liquid ";
B. the raw material with steps A is 200 ℃ in temperature; Speed is in conventional settlement separator, to separate under the condition of 30mm/min; Obtain bottom separator and top separator, wherein the bottom separator send the fire bond operation to be prepared into fire bond;
C. the B step is separated the top separator centrifugation in conventional three sections whizzers that obtains, get the solvent naphtha product on upper strata, and middle level thing and lower floor's thing, the middle level thing send the needle coke production process to prepare the needle coke product as the maltha raw material;
D. separate in the lower floor's thing that obtains at step C; Press the mass ratio of hydrogen supply dissolvent You ︰ raw material=0.5 ︰ 1,, feed H/C than the hydrogen supply dissolvent oil that is 0.5 ︰ 2.0 with the amount of 0.5L/min; Hydrogen supply dissolvent oil is oxolane; In hydrogen supply dissolvent oil effect down, in 300 ℃ of thermotonuses 10 hours, must each diversity asphalt base carbon fiber raw material.
Each diversity asphalt base carbon fiber raw material of gained is used conventional NK-MZ01 nonwoven production device again, is 0.02ml/min, industry group SO in air mass flow
2Flow is 0.003ml/min, technical grade NH
3Flow is under the 0.001ml/min condition, does not melt pre-oxidation, oxidized activating by routine, after the charing of molten asphalt fiber etc. is not handled, promptly is processed into young's modulus and reaches 185Gpa, elongation at break<each diversity carbon fiber of 0.8%.
Embodiment 2
A. get raw material by the prescription of following mass percent:
Coal tar pitch 40%
Modified coal-tar 45%
Conditioning agent 5.5%
Nickel, vanadium, cobalt remove agent 9.5%;
Wherein, Said modified coal-tar obtains through following method: with the by-product oil of coal tar and needle coke delayed coking drums; After pressing the mass ratio mixing of Mei Jiao You ︰ by-product oil=1 ︰ 1; The amount of pressing 5L/min feeds technical grade hydrogen, is that 400 ℃, pressure are 5Mpa, time to be that 3h, oil gas speed ratio are 2.0h in temperature
-1, catalyst is γ-Al
2O
3, the ZSM-5 molecular sieve condition under the reaction after, promptly obtain modified coal-tar; Said conditioning agent is that aromatization degree BMCI is 30 conditioning agent, is made up of following organic matter: ethylene glycol, propylene glycol, aromatic solvent naphtha, washing oil, carbolineum, take off aromatic solvent naphtha; Said coal tar pitch is a mid temperature pitch, is the lighting coal tar transformation of the way through coal needle coke delay coking process by-product; Said nickel, vanadium, cobalt remove agent and obtain according to " N-methylimidazole preparation method of ionic liquid ";
B. the raw material with steps A is 50 ℃ in temperature; Speed is separating by in sedimentation separation machine and the separator that three sections whizzers are combined in routine under the condition of 50mm/min; Obtain bottom separator and top separator, wherein the bottom separator send the fire bond operation to be prepared into fire bond;
C. the B step is separated the centrifugation in the separator that is combined into by sedimentation separation machine and three sections whizzers of the top separator obtain; Get the solvent naphtha product on upper strata; And middle level thing and lower floor's thing, the middle level thing send the needle coke production process to prepare the needle coke product as the maltha raw material;
D. separate in the lower floor's thing that obtains at step C; Press the mass ratio of hydrogen supply dissolvent You ︰ raw material=0.5 ︰ 1,, feed H/C than the hydrogen supply dissolvent oil that is 0.5 ︰ 1.5 with the amount of 0.8L/min; Hydrogen supply dissolvent oil is polyethylene glycol; In hydrogen supply dissolvent oil effect down, in 460 ℃ of thermotonuses 3 hours, must each diversity asphalt base carbon fiber raw material.
Each diversity asphalt base carbon fiber raw material of gained is used conventional NK-MZ01 nonwoven production device again, is 0.02ml/min, industry group SO in air mass flow
2Flow is 0.003ml/min, technical grade NH
3Flow is under the 0.001ml/min condition, does not melt pre-oxidation, oxidized activating by routine, after the charing of molten asphalt fiber etc. is not handled, promptly is processed into young's modulus and reaches 186Gpa, elongation at break<each diversity carbon fiber of 0.7%.
Embodiment 3
A. get raw material by the prescription of following mass percent:
Coal tar pitch 30%
Modified coal-tar 49%
Conditioning agent 19.5%
Nickel, vanadium, cobalt remove agent 1.5%;
Wherein, Said modified coal-tar obtains through following method: with the by-product oil of coal tar and needle coke delayed coking drums; After pressing the mass ratio mixing of Mei Jiao You ︰ by-product oil=0.8 ︰ 3; The amount of pressing 3L/min feeds technical grade hydrogen, is that 460 ℃, pressure are 0.1Mpa, time to be that 15h, oil gas speed ratio are 0.1h in temperature
-1, catalyst is γ-Al
2O
3, the ZSM-5 molecular sieve condition under the reaction after, promptly obtain modified coal-tar; Said conditioning agent is that aromatization degree BMCI is 75 conditioning agent, is made up of organic matter kerosene; Said coal tar pitch is a mid temperature pitch, is the lighting coal tar transformation of the way through coal needle coke delay coking process by-product; Said nickel, vanadium, cobalt remove agent and obtain according to " N-methylimidazole preparation method of ionic liquid ";
B. the raw material with steps A is 100 ℃ in temperature; Speed is in conventional settlement separator, to separate under the condition of 10mm/min; Obtain bottom separator and top separator, wherein the bottom separator send the fire bond operation to be prepared into fire bond;
C. the B step is separated the centrifugation in the separator that is combined into by sedimentation separation machine and three sections whizzers of the top separator obtain; Get the solvent naphtha product on upper strata; And middle level thing and lower floor's thing, the middle level thing send the needle coke production process to prepare the needle coke product as the maltha raw material;
D. separate in the lower floor's thing that obtains at step C; Press the mass ratio of hydrogen supply dissolvent You ︰ raw material=0.5 ︰ 1,, feed H/C than the hydrogen supply dissolvent oil that is 0.5 ︰ 1.8 with the amount of 0.8L/min; Hydrogen supply dissolvent oil is polyethylene glycol, take off aromatic solvent naphtha, three kinds of miscellas of circulating solvent oil; In hydrogen supply dissolvent oil effect down, in 400 ℃ of thermotonuses 7 hours, must each diversity asphalt base carbon fiber raw material.
Each diversity asphalt base carbon fiber raw material of gained is used conventional NK-MZ01 nonwoven production device again, is 0.02ml/min, industry group SO in air mass flow
2Flow is 0.003ml/min, technical grade NH
3Flow is under the 0.001ml/min condition, does not melt pre-oxidation, oxidized activating by routine, after the charing of molten asphalt fiber etc. is not handled, promptly is processed into young's modulus and reaches 184Gpa, elongation at break<each diversity carbon fiber of 0.8%.
Embodiment 4
A. get raw material by the prescription of following mass percent:
Coal tar pitch 40%
Modified coal-tar 45%
Conditioning agent 10%
Nickel, vanadium, cobalt remove agent 5%;
Wherein, Said modified coal-tar obtains through following method: with the by-product oil of coal tar and needle coke delayed coking drums; After pressing the mass ratio mixing of Mei Jiao You ︰ by-product oil=1 ︰ 1.5; The amount of pressing 2L/min feeds technical grade hydrogen, is that 450 ℃, pressure are 2Mpa, time to be that 10h, oil gas speed ratio are 0.9h in temperature
-1, catalyst is γ-Al
2O
3, the ZSM-5 molecular sieve condition under the reaction after, promptly obtain modified coal-tar; Said conditioning agent is that aromatization degree BMCI is 70 conditioning agent, is made up of following organic matter: diesel oil, ethylene glycol; Said coal tar pitch is a mid temperature pitch, is the lighting coal tar transformation of the way through coal needle coke delay coking process by-product; Said nickel, vanadium, cobalt remove agent and obtain according to " N-methylimidazole preparation method of ionic liquid ";
B. the raw material with steps A is 150 ℃ in temperature; Speed is to separate by in sedimentation separation machine and the separator that three sections whizzers are combined under the condition of 20mm/min; Obtain bottom separator and top separator, wherein the bottom separator send the fire bond operation to be prepared into fire bond;
C. the B step is separated the top separator centrifugation in conventional three sections whizzers that obtains, get the solvent naphtha product on upper strata, and middle level thing and lower floor's thing, the middle level thing send the needle coke production process to prepare the needle coke product as the maltha raw material;
D. separate in the lower floor's thing that obtains at step C; Press the mass ratio of hydrogen supply dissolvent You ︰ raw material=0.5 ︰ 1,, feed H/C than the hydrogen supply dissolvent oil that is 0.5 ︰ 2.0 with the amount of 0.1L/min; Hydrogen supply dissolvent oil is oxolane, polyethylene glycol, take off the miscella of aromatic solvent naphtha; In hydrogen supply dissolvent oil effect down, in 360 ℃ of thermotonuses 5 hours, must each diversity asphalt base carbon fiber raw material.
Each diversity asphalt base carbon fiber raw material of above-mentioned steps D gained is 0.02ml/min, technical grade SO with conventional NK-MZ01 nonwoven production device in air mass flow
2Flow is 0.003ml/min, technical grade NH
3Flow is under the 0.001ml/min condition, does not melt pre-oxidation, oxidized activating by routine, after the charing of molten asphalt fiber etc. is not handled, promptly is processed into young's modulus and reaches 187Gpa, elongation at break<each diversity carbon fiber product of 0.9%.
Claims (7)
1. a tar needle-shape coke intensifies and produces the method for carbon fiber material, it is characterized in that comprising following each step:
A. get raw material by the prescription of following mass percent:
Coal tar pitch 30～50%
Modified coal-tar 40～50%
Conditioning agent 5.5～19.5%
Nickel, vanadium, cobalt remove agent 1.0～10.5%;
B. the raw material with steps A is 50～200 ℃ in temperature, and speed is to separate under the condition of 10～50mm/min, obtains bottom separator and top separator, wherein bottom separator send the fire bond operation to be prepared into fire bond;
C. the B step is separated the top separator obtain through centrifugation, the solvent naphtha product on upper strata, and middle level thing and lower floor's thing, the middle level thing send the needle coke production process to prepare the needle coke product as the maltha raw material;
D. separate in the lower floor's thing that obtains at step C; Press the mass ratio of hydrogen supply dissolvent You ︰ raw material=0.5 ︰ 1; With the amount of 0.1L～0.8L/min, feeding the H/C ratio is the hydrogen supply dissolvent oil of 0.5 ︰ 2.0 ~ 1.5, under the effect of hydrogen supply dissolvent oil; In 300～460 ℃ of thermotonuses 3～10 hours, each diversity asphalt base carbon fiber raw material.
2. method according to claim 1; It is characterized in that: the modified coal-tar in the said steps A obtains through following method: with the by-product oil of coal tar and needle coke delayed coking drums; After pressing the mass ratio mixing of Mei Jiao You ︰ by-product oil=0.5～1 ︰ 1～3; The amount of pressing 1L～5L/min feeds technical grade hydrogen in the miscella, is that 350～460 ℃, pressure are that 0.1～5Mpa, oil gas speed ratio are 0.1～3.0h in temperature
-1, catalyst is γ-Al
2O
3, the ZSM-5 molecular sieve condition under react 3～15h after, promptly obtain modified coal-tar.
3. method according to claim 1; It is characterized in that: the conditioning agent in the said steps A is that aromatization degree BMCI is 30～75 conditioning agent; Form by in the following organic matter one or more: crude benzol, toluene, heavy benzol, kerosene, diesel oil, ethylene glycol, propylene glycol, aromatic solvent naphtha, washing oil, carbolineum, take off aromatic solvent naphtha; Wherein, said aromatization degree BMCI is drawn by computes:
BMCI=?48640/Tb,m+473.6d-456.8
In the formula, Tb, m are raw material boiling point mean value, and unit is K;
D is the density of raw material when 288.5K, and unit is kg/m
3
4. method according to claim 1 is characterized in that: the conditioning agent preferred fragrance degree BMCI in the said steps A is 55 ~ 70 conditioning agent.
5. method according to claim 1 is characterized in that: the coal tar pitch in the said steps A is a mid temperature pitch, is the lighting coal tar transformation of the way through coal needle coke delay coking process by-product.
6. method according to claim 1; It is characterized in that: the separation of said B step is accomplished in conventional settlement separator; The centrifugation of said C step is accomplished on conventional three sections whizzers, and the separation of perhaps said B step, C step is in the separator that is combined into by conventional sedimentation separation machine and three sections whizzers, to accomplish.
7. method according to claim 1 is characterized in that: the hydrogen supply dissolvent oil of said D step is oxolane, polyethylene glycol, take off a kind of in aromatic solvent naphtha, the circulating solvent oil or three kinds.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112105707A (en) * | 2017-12-22 | 2020-12-18 | 卡本控股知识产权有限责任公司 | Method for producing carbon fibers, resins, graphene and other higher carbon materials from coal |
| US11975975B2 (en) | 2021-09-10 | 2024-05-07 | Carbon Holdings Intellectual Properties, Llc | Systems for producing advanced carbon materials at carbon source locations |
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|---|---|---|---|---|
| JPS644693A (en) * | 1987-06-26 | 1989-01-09 | Kawasaki Steel Co | Production of mesophase pitch |
| JPH0273885A (en) * | 1988-09-08 | 1990-03-13 | Mitsubishi Kasei Corp | Production of needle coke |
| CN1793287A (en) * | 2005-12-29 | 2006-06-28 | 中钢集团鞍山热能研究院 | Process for producing tar needle-shape coke raw material |
| CN101302431A (en) * | 2008-06-30 | 2008-11-12 | 邯郸市鑫宝煤化工有限公司 | Preparation of asphalt for producing coal-based needle coke |
| CN101787299A (en) * | 2010-03-01 | 2010-07-28 | 上海尚元化工工程技术有限公司 | Method for extracting, producing and purifying pitch with mixed solvent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS644693A (en) * | 1987-06-26 | 1989-01-09 | Kawasaki Steel Co | Production of mesophase pitch |
| JPH0273885A (en) * | 1988-09-08 | 1990-03-13 | Mitsubishi Kasei Corp | Production of needle coke |
| CN1793287A (en) * | 2005-12-29 | 2006-06-28 | 中钢集团鞍山热能研究院 | Process for producing tar needle-shape coke raw material |
| CN101302431A (en) * | 2008-06-30 | 2008-11-12 | 邯郸市鑫宝煤化工有限公司 | Preparation of asphalt for producing coal-based needle coke |
| CN101787299A (en) * | 2010-03-01 | 2010-07-28 | 上海尚元化工工程技术有限公司 | Method for extracting, producing and purifying pitch with mixed solvent |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112105707A (en) * | 2017-12-22 | 2020-12-18 | 卡本控股知识产权有限责任公司 | Method for producing carbon fibers, resins, graphene and other higher carbon materials from coal |
| US11634331B2 (en) | 2017-12-22 | 2023-04-25 | Carbon Holdings Intellectual Properties, Llc | Methods for producing advanced carbon materials from coal |
| US11767223B2 (en) | 2017-12-22 | 2023-09-26 | Carbon Holdings Intellectual Properties, Llc | Methods for forming resins and other byproducts from raw coal |
| US11807537B2 (en) | 2017-12-22 | 2023-11-07 | Carbon Holdings Intellectual Properties, Llc | Methods for producing carbon fiber from coal |
| US11975975B2 (en) | 2021-09-10 | 2024-05-07 | Carbon Holdings Intellectual Properties, Llc | Systems for producing advanced carbon materials at carbon source locations |
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