CN102021011A - Method for producing asphalt from coal tar - Google Patents
Method for producing asphalt from coal tar Download PDFInfo
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- CN102021011A CN102021011A CN2010106122644A CN201010612264A CN102021011A CN 102021011 A CN102021011 A CN 102021011A CN 2010106122644 A CN2010106122644 A CN 2010106122644A CN 201010612264 A CN201010612264 A CN 201010612264A CN 102021011 A CN102021011 A CN 102021011A
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- coal tar
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- electric desalting
- asphalt
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Abstract
The invention belongs to the technical field of coal chemical industry, in particular to a method for producing asphalt from coal tar, which is used for solving a technical problem. The asphalt produced by the method contains low sodium content and ash content. The method for producing the asphalt from the coal tar is as follows: fixed ammonium salt in the coal tar is removed through electric desalting; and distilling to obtain the asphalt. In the method, the electric desalting is firstly adopted to process the coal tar so as to obtain low-ash low-sodium asphalt, thereby providing a novel choice for the methods of producing the asphalt from the coal tar.
Description
Technical field
The invention belongs to technical field of coal chemical industry, particularly coal tar is produced the bituminous method.
Background technology
Coal tar contained humidity essence is not separate remained ammonia completely, and wherein contained volatilization ammonia is removed in the dehydration of tar distillation, and solid ammonium-salt is still stayed in the anhydrous tar.When being heated to 220～250 ℃, solid ammonium-salt can decompose:
Dry state hydrogenchloride is not have corrosively, but has formed hydrochloric acid after meeting water, has very strong corrosive nature, causes the corrosion of system of fraction overhead portion.Therefore, must remove solid ammonium-salt in the tar as far as possible.
Traditional tar processing is taken off solid ammonium-salt and is adopted the sodium carbonate solution neutralisation, and reaction formula is:
2NH
4Cl+Na
2CO
3→2NH
3+CO
2+2NaCl+H
2O
The sodium salt that this method generates is stable, can not decompose under the Heating temperature of tar distillation.This technical maturity is reliable, but sodium salt enters pitch, makes the bituminous sodium content increase by 50～70ppm, and ash content increases by 120～160ppm.Because metallic element such as sodium has katalysis to the oxidation of carbon material, so neutralisation has restricted coal-tar pitch and has been used to produce high-grade carbon material product.
Summary of the invention
Technical problem to be solved by this invention provides a kind of coal tar and produces the bituminous method, and pitch sodium content, ash content that this method makes are lower.
Coal tar of the present invention is produced the bituminous method and is specially: remove solid ammonium-salt in the coal tar by electric desalting, fractionation obtains pitch again.
Strength of electric field is 300～700v/cm during electric desalting, is preferably 400～600v/cm.
Coal tar need be heated to 120～170 ℃ before the electric desalting.
The water that adds 5～8% volumes before the electric desalting in the coal tar.
The effect of desalination when containing emulsion splitter in the water that adds, dehydration is better.The consumption of emulsion splitter is 10～40ppm, is preferably 20～30ppm.
Emulsion splitter is preferably water-soluble demulsifier, at least a as among SXP201, SXB204, the SXE604.
The present invention adopts electric desalting to replace adding the alkali neutralisation coal tar to be carried out pre-treatment, the anhydrous pix carbonis praeparsta saliferous＜5mg/l of gained, moisture＜0.3%.
In order further to reduce the solid ammonium-salt in the coal tar, the coal tar that obtains after the electric desalting once can be added electric desalting once more behind the water of 5～8% volumes.
The gained raffinate can be used for the bituminous composition that configuration contains high-grade carbon black oil of sodium＜10ppm or ash content＜0.1% for containing the high-quality asphalt product of sodium＜10ppm, ash content＜0.1% behind the coal tar fractional distillation that electric desalting obtains.
Remaining a small amount of solid ammonium-salt can produce HCl and H during fractionation in the anhydrous pix carbonis praeparsta
2Sour gas such as S, etching apparatus.Therefore in the water of condensation in fractionation initial set district, add the weakly alkaline inorganic reagent, control water of condensation pH value 7.5～8.5.Add in the water of condensation weakly alkaline inorganic reagent can in and HCl and H
2Sour gas such as S prevent equipment corrosion.
The weakly alkaline inorganic reagent is preferably ammoniacal liquor.
The present invention adopts the electric desalting mode to handle coal tar first, obtains the asphaltic products. of the low sodium of low ash, produces the bituminous method for coal tar a kind of new selection is provided.
Embodiment
Water-soluble demulsifier SXP201, SXB204, the SXE604 that following examples adopt is that the Changjiang river (in raising) electric desalting equipment company limited produces.
Embodiment 1
1. raw tar is heated to 140～160 ℃ with being pumped into the tube furnace convection zone;
2. the tar after the heating adds the water of 5～8% volumes, thorough mixing in high efficiency static mixer; Add 20～30ppm emulsion splitter SXB204 in the water.
3. the oil-water mixture that obtains of step 2 enters in the electric desalting pretreater jar, under the 400v/cm electric field action, realizes separating.Water is discharged from tank body top, and the coal tar oil phase is told from pot bottom.
4. the pretreated anhydrous refined tar of step 3 electric desalting contains NaCl salt＜5mg/l, moisture＜0.3%.
5. anhydrous refined tar is pumped into the tube furnace radiation section with two sections tar and is heated to 360 ℃, sends into flash evaporator-cut tower and carries out the cut cutting.
6. cut column overhead gas phase pipeline injects ammoniacal liquor, in and HCl and H
2Sour gas such as S are controlled at 7.5～8.5 with water of condensation pH value.
7. obtain mid-temperature pitch at the bottom of the flash evaporator tower and contain sodium＜10ppm, ash content＜0.1%, can press 3: 7 the high-grade carbon black oil of proportional arrangement with carbolineum.
Embodiment 2
1. raw tar is in interchanger and a carbolineum heat exchange to 130 ℃;
2. the tar after the heat exchange adds the water of 5～8% volumes, thorough mixing in high efficiency static mixer; Add 20～30ppm emulsion splitter SXB204 in the water.
3. the oil-water mixture that obtains of step 2 enters in the one-level electric desalting pretreater jar, under the 500v/cm electric field action, realizes separating.Water is discharged from tank body top, and the coal tar oil phase is told from pot bottom.
4. the coal tar that obtains of step 3 adds the water of 5～8% volumes, thorough mixing in high efficiency static mixer; Add 20～30ppm emulsion splitter SXB204 in the water.
5. the oil-water mixture that obtains of step 4 enters in the secondary electric desalting pretreater jar, under the 600v/cm electric field action, realizes separating.Same water is told from tank body top in the secondary jar, tells from pot bottom through the coal tar oil phase that washs after making with extra care.
6. the anhydrous refined tar that obtains of step 5 contains NaCl salt＜5mg/l, moisture＜0.3%.
7. anhydrous refined tar is pumped into the tube furnace radiation section with two sections tar and is heated to 360 ℃, sends into flash evaporator-cut tower and carries out the cut cutting.
8. cut column overhead gas phase pipeline injects ammoniacal liquor, in and HCl and H
2Sour gas such as S are controlled at 7.5～8.5 with water of condensation pH value.
9. obtain mid-temperature pitch at the bottom of the flash evaporator tower and contain sodium＜5ppm, ash content＜0.1%, can press 7: 2: 1 proportional arrangement bituminous composition with carbolineum and dimethylbenzene.
Claims (9)
1. coal tar is produced the bituminous method, and it is characterized in that: remove solid ammonium-salt in the coal tar by electric desalting, fractionation obtains pitch again.
2. coal tar according to claim 1 is produced the bituminous method, and it is characterized in that: strength of electric field is 300～700v/cm during electric desalting.
3. coal tar according to claim 1 is produced the bituminous method, it is characterized in that: coal tar is heated to 120～170 ℃ before the electric desalting.
4. produce the bituminous method according to each described coal tar of claim 1～3, it is characterized in that: the water that adds 5～8% volumes before the electric desalting in the coal tar.
5. coal tar according to claim 4 is produced the bituminous method, it is characterized in that: the emulsion splitter that contains 10～40ppm in the water.
6. coal tar according to claim 5 is produced the bituminous method, it is characterized in that: the emulsion splitter that contains 20～30ppm in the water.
7. produce the bituminous method according to claim 5 or 6 described coal tar, it is characterized in that: emulsion splitter is a water-soluble demulsifier.
8. coal tar according to claim 1 is produced the bituminous method, it is characterized in that: add the weakly alkaline inorganic reagent in the fractionated initial set district water of condensation, control water of condensation pH value 7.5～8.5.
9. coal tar according to claim 8 is produced the bituminous method, and it is characterized in that: described weakly alkaline inorganic reagent is an ammoniacal liquor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106122644A CN102021011A (en) | 2010-12-29 | 2010-12-29 | Method for producing asphalt from coal tar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106122644A CN102021011A (en) | 2010-12-29 | 2010-12-29 | Method for producing asphalt from coal tar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102021011A true CN102021011A (en) | 2011-04-20 |
Family
ID=43862800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010106122644A Pending CN102021011A (en) | 2010-12-29 | 2010-12-29 | Method for producing asphalt from coal tar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102021011A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304379A (en) * | 2011-08-11 | 2012-01-04 | 华尔润玻璃产业股份有限公司 | Method for removing ammonium salt in coal tar |
| CN105505425A (en) * | 2014-09-24 | 2016-04-20 | 上海宝钢化工有限公司 | Pretreatment system and method for non-corrosive sodium-free asphalt production |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563278A (en) * | 2004-04-14 | 2005-01-12 | 朱小花 | Tecnique for producing mesothermal and modified asphaltum in intermittent single kettle type |
| CN1903984A (en) * | 2005-07-27 | 2007-01-31 | 上海坤维化工科技有限公司 | Hydrogenation method for coal tar processing and its equipment |
| CN101139527A (en) * | 2007-10-17 | 2008-03-12 | 上海奥韦通工程技术有限公司 | Method for extracting multiple chemical products from coal-tar oil |
-
2010
- 2010-12-29 CN CN2010106122644A patent/CN102021011A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563278A (en) * | 2004-04-14 | 2005-01-12 | 朱小花 | Tecnique for producing mesothermal and modified asphaltum in intermittent single kettle type |
| CN1903984A (en) * | 2005-07-27 | 2007-01-31 | 上海坤维化工科技有限公司 | Hydrogenation method for coal tar processing and its equipment |
| CN101139527A (en) * | 2007-10-17 | 2008-03-12 | 上海奥韦通工程技术有限公司 | Method for extracting multiple chemical products from coal-tar oil |
Non-Patent Citations (2)
| Title |
|---|
| 古映莹等: "煤焦油过滤分离的研究", 《过滤与分离》, vol. 17, no. 2, 28 February 2007 (2007-02-28), pages 25 - 27 * |
| 崔楼伟等: "响应面法优化煤焦油电脱盐工艺", 《化学反应工程与工艺》, vol. 26, no. 3, 31 March 2010 (2010-03-31) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304379A (en) * | 2011-08-11 | 2012-01-04 | 华尔润玻璃产业股份有限公司 | Method for removing ammonium salt in coal tar |
| CN105505425A (en) * | 2014-09-24 | 2016-04-20 | 上海宝钢化工有限公司 | Pretreatment system and method for non-corrosive sodium-free asphalt production |
| CN105505425B (en) * | 2014-09-24 | 2018-06-08 | 上海宝钢化工有限公司 | Pretreatment system and method for non-corrosive sodium-free asphalt production |
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Application publication date: 20110420 |