CN116571552A - Ash removal and separation process for direct coal liquefaction residues - Google Patents
Ash removal and separation process for direct coal liquefaction residues Download PDFInfo
- Publication number
- CN116571552A CN116571552A CN202310719711.3A CN202310719711A CN116571552A CN 116571552 A CN116571552 A CN 116571552A CN 202310719711 A CN202310719711 A CN 202310719711A CN 116571552 A CN116571552 A CN 116571552A
- Authority
- CN
- China
- Prior art keywords
- coal
- direct
- ash
- liquefaction residue
- pitch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 66
- 238000000926 separation method Methods 0.000 title description 2
- 239000011300 coal pitch Substances 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims description 16
- 230000035484 reaction time Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000002003 electrode paste Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 description 11
- 238000003763 carbonization Methods 0.000 description 6
- 239000011294 coal tar pitch Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/80—Destroying solid waste or transforming solid waste into something useful or harmless involving an extraction step
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to a process for removing ash from coal direct liquefaction residues, which belongs to the field of coal chemical industry. The two substances of the coal direct liquefaction residue and the coal pitch can react with each other, ash in the coal direct liquefaction residue can be extracted by the coal pitch, the ash content can be reduced from 14% to below 7%, the ash content in the coal direct liquefaction residue is effectively reduced, the processed coal direct liquefaction residue can be used as a raw material for preparing electrode paste, and the economic value of the coal direct liquefaction residue is greatly improved.
Description
Technical Field
The invention relates to the technical field of coal chemical industry, in particular to a process for removing ash from direct coal liquefaction residues.
Background
The direct coal liquefaction residue (coal-to-oil residue) is a solid mixture with high carbon, high ash, high sulfur and complex components, and is a main byproduct in the direct coal liquefaction process. Coal-to-liquids residue generally represents about 30% of the feed, is in the form of a flaky black solid, and is a mixture of various substances. Because the ash content and the sulfur content are high, the coal-to-liquid converter can only be used for heating, the coal-to-oil residue is softened at 180 ℃ and flows at 300 ℃, the coal-to-oil converter is mixed with coal to burn, coking is easy, a returning charge device is blocked, a furnace is damaged, and the pollutant content is high.
The main reason why the direct coal liquefaction residues have no utilization value is that the ash content is high, and the ash content can directly influence the quality of downstream products, so that the ash content in the direct coal liquefaction residues needs to be reduced, and the residues with the reduced ash content can be continuously and deeply processed into various chemical products.
Disclosure of Invention
In order to overcome the defects in the prior art, a process for removing ash from direct coal liquefaction residues is provided, so that the problems in the background art are solved.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the process for removing ash from the direct coal liquefaction residue comprises the steps of fully mixing the direct coal liquefaction residue with coal pitch to obtain a mixture, heating the mixture to 340-360 ℃ while isolating air, keeping the temperature until the raw material reaction is completed, and finally standing for layering, and taking an upper layer substance.
As a further technical scheme of the invention: the ratio of the direct coal liquefaction residues to the coal pitch is 75-85 percent and 15-25 percent.
As a further technical scheme of the invention: the reaction time of the raw materials is 9-11 hours.
As a further technical scheme of the invention: the standing time is 40-60 hours.
The invention has the beneficial effects that:
according to the invention, the mixture of the liquefied residue and the coal tar pitch is isolated from air heating, carbonization is prevented from occurring due to no reaction, in the heating process, two substances of the direct liquefied residue of the coal and the coal tar pitch can react with each other, ash in the direct liquefied residue of the coal can be extracted by the coal tar pitch and then naturally subsided, ash in the upper-layer substances can react and subside, the ash content can be reduced from 14% to below 7%, the ash content in the direct liquefied residue of the coal is effectively reduced, the treated direct liquefied residue of the coal can be used as a raw material for preparing electrode paste, and the economic value of the direct liquefied residue of the coal is greatly improved.
Description of the embodiments
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
The ash removing process of the direct coal liquefaction residue comprises the steps of fully mixing the direct coal liquefaction residue and coal pitch to obtain a mixture, wherein the direct coal liquefaction residue is solid at normal temperature, and the coal pitch is solid at normal temperature, and the ratio of the direct coal liquefaction residue to the coal pitch is 75-85 percent, namely 15-25 percent; heating the mixture to 340-360 ℃ while isolating air, and keeping the temperature until the raw material reaction is completed, wherein the raw material reaction time is 9-11 hours; then standing for 40-60 hours, and taking the upper layer material after standing and layering. When the reaction is heated, air is isolated, if no reaction is performed, carbonization occurs, the air is isolated, the temperature is heated to 340-360 ℃, two substances of coal direct liquefaction residues and coal pitch can react with each other, ash in the coal direct liquefaction residues can be extracted by the coal pitch, then the ash is naturally settled, ash in the upper substances is reacted and settled out, and the ash content in the coal direct liquefaction residues is effectively reduced.
Examples
The ash removal process of the direct coal liquefaction residue comprises the steps of fully mixing the direct coal liquefaction residue and coal pitch to obtain a mixture, wherein the direct coal liquefaction residue is solid at normal temperature, and the coal pitch is also solid at normal temperature, and the ratio of the direct coal liquefaction residue to the coal pitch is 75 percent to 25 percent; then the mixture is heated to 340 ℃ in an isolated way, and the temperature is kept until the reaction of the raw materials is completed, wherein the reaction time of the raw materials is 11 hours; finally, standing for 50 hours, and taking the upper layer substance after standing and layering. When the reaction is heated, air is isolated, if the reaction is not performed, carbonization occurs, the air is isolated, the temperature is heated to 340 ℃, two substances of the coal direct liquefaction residue and coal pitch can react with each other, ash in the coal direct liquefaction residue can be extracted by the coal pitch, then the ash is naturally settled, ash in the upper-layer substances is reacted and settled out, and the ash content in the coal direct liquefaction residue is effectively reduced.
Examples
The ash removal process of the direct coal liquefaction residue comprises the steps of fully mixing the direct coal liquefaction residue and coal pitch to obtain a mixture, wherein the direct coal liquefaction residue is solid at normal temperature, and the coal pitch is also solid at normal temperature, and the ratio of the direct coal liquefaction residue to the coal pitch is 85 percent to 15 percent; then the mixture is heated to 360 ℃ in an isolated air way and kept at the temperature until the reaction of the raw materials is completed, and the reaction time of the raw materials is 9 hours; finally, standing for 50 hours, and taking the upper layer substance after standing and layering. When the reaction is heated, air is isolated, if no reaction is performed, carbonization occurs, the air is isolated, the temperature is heated to 360 ℃, two substances of coal direct liquefaction residues and coal tar pitch can react with each other, ash in the coal direct liquefaction residues can be extracted by the coal tar pitch, then natural sedimentation is performed, ash in substances on the upper layer is reacted and settled out, and the ash content in the coal direct liquefaction residues is effectively reduced.
Examples
The ash removal process of the direct coal liquefaction residue comprises the steps of fully mixing the direct coal liquefaction residue and coal pitch to obtain a mixture, wherein the direct coal liquefaction residue is solid at normal temperature, and the coal pitch is also solid at normal temperature, and the ratio of the direct coal liquefaction residue to the coal pitch is 80 percent to 20 percent; then the mixture is heated to 350 ℃ in an isolated air way, and the temperature is kept until the reaction of the raw materials is completed, wherein the reaction time of the raw materials is 10 hours; finally, standing for 50 hours, and taking the upper layer substance after standing and layering. When the reaction is heated, air is isolated, if the reaction is not performed, carbonization occurs, the air is isolated, the temperature is heated to 350 ℃, two substances of the coal direct liquefaction residue and coal pitch can react with each other, ash in the coal direct liquefaction residue can be extracted by the coal pitch, then the ash is naturally settled, ash in the upper-layer substances is reacted and settled out, and the ash content in the coal direct liquefaction residue is effectively reduced.
Examples
The ash removal process of the direct coal liquefaction residue comprises the steps of fully mixing the direct coal liquefaction residue and coal pitch to obtain a mixture, wherein the direct coal liquefaction residue is solid at normal temperature, and the coal pitch is also solid at normal temperature, and the ratio of the direct coal liquefaction residue to the coal pitch is 77% -23%; then the mixture is heated to 355 ℃ in an isolated air way and kept at the temperature until the reaction of the raw materials is completed, and the reaction time of the raw materials is 9.5 hours; finally, standing for 60 hours, and taking the upper layer substance after standing and layering. When the reaction is heated, air is isolated, if no reaction is performed, carbonization occurs, the air is isolated, the temperature is heated to 355 ℃, two substances of the coal direct liquefaction residue and coal pitch can react with each other, ash in the coal direct liquefaction residue can be extracted by the coal pitch, then the ash is naturally settled, ash in the upper-layer substances is reacted and settled out, and the ash content in the coal direct liquefaction residue is effectively reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. The process for removing ash from the direct coal liquefaction residues is characterized by comprising the following steps of: firstly, fully mixing the direct coal liquefaction residues and coal pitch to obtain a mixture, then heating the mixture to 340-360 ℃ in an air-isolated manner, keeping the temperature until the reaction of the raw materials is completed, and finally standing for layering, and taking an upper layer substance.
2. The coal direct liquefaction residue ash removal process according to claim 1, wherein: the ratio of the direct coal liquefaction residues to the coal pitch is 75-85 percent and 15-25 percent.
3. The coal direct liquefaction residue ash removal process according to claim 1 or 2, characterized in that: the reaction time of the raw materials is 9-11 hours.
4. The coal direct liquefaction residue ash removal process according to claim 2, wherein: the standing time is 40-60 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310719711.3A CN116571552A (en) | 2023-06-17 | 2023-06-17 | Ash removal and separation process for direct coal liquefaction residues |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310719711.3A CN116571552A (en) | 2023-06-17 | 2023-06-17 | Ash removal and separation process for direct coal liquefaction residues |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116571552A true CN116571552A (en) | 2023-08-11 |
Family
ID=87534217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310719711.3A Pending CN116571552A (en) | 2023-06-17 | 2023-06-17 | Ash removal and separation process for direct coal liquefaction residues |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116571552A (en) |
-
2023
- 2023-06-17 CN CN202310719711.3A patent/CN116571552A/en active Pending
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