CN101575533A - Improved method for preparing fuel oil by coal tar hydrogenation - Google Patents
Improved method for preparing fuel oil by coal tar hydrogenation Download PDFInfo
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- CN101575533A CN101575533A CNA2008100644520A CN200810064452A CN101575533A CN 101575533 A CN101575533 A CN 101575533A CN A2008100644520 A CNA2008100644520 A CN A2008100644520A CN 200810064452 A CN200810064452 A CN 200810064452A CN 101575533 A CN101575533 A CN 101575533A
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Abstract
The invention relates to an improved method for preparing fuel oil by coal tar hydrogenation, which comprises the steps of prefractionation, hydrogenation for refining and fractionation, wherein prefractionation is realized by the method that an aromatic solvent and oil in coal tar are mixed according to the proportion of 1:20-1:40, and solid particles larger than 25 microns are filtered and removed under positive pressure so as to primarily remove solid mechanical impurities and prevent a heat exchanger and an inlet of a hydrogenation reactor from coking; a prefractionation tower is operated under the negative pressure with a vacuum degree of -0.05MPa; an oil extractor at the top of the prefractionation tower adopts low-pressure steam as power; noncondensable gas in a reflux tank at the top of the prefractionation tower is pumped out; after being cooled to 40 DEG C by a water cooler of a pumping system, the oil enters an oil skimming tank for three-phase separation, and the noncondensable gas is exhausted into the atmosphere; a part of the oil is sent to a hydrogenation raw oil storage tank of a tank area by an emptying oil pump, and a small part of the oil at the proportion of 6-10:1 to the whole oil is conveyed to high-viscosity heavy coal oil to adjust the viscosity so as to ensure that the solidifying point of the heavy coal oil is dropped to 35-42 DEG C from 60-70 DEG C; and heavy oil at the bottom of the prefractionation tower is sent to a heavy oil storage tank for adjusting the viscosity. The improved method is applied to the field of coal chemical industry.
Description
Technical field:
What the present invention relates to is to utilize a kind of hydrogenation technique and prefractionation method that coal tar is made the oil fuel processing method.
Background technology:
The existing technology of coal tar hydrogenating is to utilize existing purified gas purifying hydrogen of hydrogen more than needed, and utilizes oily coal tar in the present byproduct PKM vapourizing furnace, and fractionation production hydrogenating materials and coal system heavy oil adopt hydrogenation technique that hydrogenating materials is carried out upgrading.Upgraded product makes petroleum naphtha and coal system fuel oil through fractionation, and the hydrocarbon gas of production process by-product send the fuel gas pipe network, and coal system heavy oil is sold outward.
Present prefractionation part technical process: the stock oil from tank field stock oil basin enters prefractionation stock oil surge tank after boosting pump boosts, and enters the stock oil preliminary fractionator after heating up through heat exchange.Overhead gas enters preliminary fractionator top return tank and carries out the oil gas water three phase separation after the condensation cooling, an oily part is made trim the top of column, and a part is extracted the reaction raw materials oil measure jar that send the back out and done the use of reactive moieties raw material.
Preliminary fractionator ground coal system heavy oil directly goes the heavy oil height to put the groove entrucking after heat exchange.
Preliminary fractionator adopts negative-pressure operation.Vacuum tightness-0.05MPA cat head evacuation adopts low-pressure steam as power, non-condensable gas in the prefractionation cat head return tank is extracted out, after after the evacuation system water cooler is cooled to 40 degree, enters skimming tank and carry out three phase separation, non-condensable gas enters atmosphere, deliver to tank field stock oil basin by the emptying oil pump, oily(waste)water is pumped into the sour water jar.
Decompression shunting flow process is partly adopted in the raw material prefractionation, reduces cut point, slows down condensation, coking speed, the prolong operation cycle of inferior feedstock oil high-temperature heating process, and reactive moieties adopts cold minute flow process, simplifies flow process; Separation column and stabilizer tower flow process are partly adopted in fractionation.
The former technology of fractionation part: oily through entering separation column behind heat exchange to 275 degree from the low branch that refining reaction partly comes, cat head oil gas enters separation column top return tank and carries out the oil gas water three phase separation after the condensation of separation column air cooler is cooled to 40 degree.The gas that flash distillation is come out drains into the fuel gas pipe network, and sulfur-bearing contains the powerless sour water jar of ammonia sewage, and an oil phase part is as trim the top of column, and a part is removed stabilizer tower as thick gas and oil.A diesel oil part is made the stabilizer reboiler thermal source and is added separation column through reboiler furnace at the bottom of the tower, and another part is cooled to 40 degree through heat exchange and goes to the tank field to make the finished product coal made fuel oil.Thick gas and oil enters further rectifying behind the stabilizer tower, obtains the product petroleum naphtha, goes the petroleum naphtha basin to wait for outer selling.
Summary of the invention:
Improved preparing fuel oil by coal tar hydrogenation and the catalyst process that effect is remarkable, the oily yield of upgrading is high that the purpose of this invention is to provide a kind of coal tar dehydration.
Above-mentioned purpose realizes by following technical scheme:
Improved method for preparing fuel oil by coal tar hydrogenation, its composition comprises: prefractionation, hydrofining, fractionation, described prefractionation be aromatic solvent with coal tar in oil in proportion 1: 20-1: 40 mix, malleation removes by filter the solid particulate greater than 25 microns, tentatively remove the solid mechanical impurity, prevent the coking of interchanger and hydrogenator inlet, preliminary fractionator adopts negative-pressure operation, vacuum tightness-0.05MPa, the cat head evacuation adopts low-pressure steam as power, non-condensable gas in the prefractionation cat head return tank is extracted out, after after the evacuation system water cooler is cooled to 40 degree, enters skimming tank and carry out three phase separation, non-condensable gas enters atmosphere, and part oil is delivered to tank field hydrogenating materials oil measure jar by the emptying oil pump, sub-fraction oil 6-10: 1 is transported to full-bodied coal system heavy oil tank transfers sticking, the condensation point of the coal system of making heavy oil drops to the 35-42 degree by the 60-70 degree, and heavy oil goes heavy oil service tank to wait for that accent coagulates at the bottom of the prefractionation Tata.
Described improved method for preparing fuel oil by coal tar hydrogenation, upgrading oil removes hydrogenation reaction stock oil basin after the prefractionation, wait for hydrogenation, described hydrofining comprises hydrogenating desulfurization, hydrodenitrification, hydrogenation deoxidation, hydrogenation of olefins is saturated, aromatic hydrogenation is full to be closed, hydrocracking, hydrodemetallation (HDM), condensation reaction, particularly under the situation that catalyzer FH-98 exists, C-S takes place under the H2 effect, C-N and C-O bond rupture, and insatiable hunger is closed full the closing of hydro carbons and is waited and react (monoolefine: R-CH=CH2+H2 → R-CH2-CH3 diolefin: R-CH=CH-CH=CH2+2H2 → R-CH2-CH2-CH2-CH3).
This technical scheme has following beneficial effect:
1. the present invention is an aromatic solvent owing to added a certain amount of light oil in the oil in coal tar, adopts the method for light oil azeotropic continuously dehydrating, makes the effect of coal tar dehydration remarkable.Cat head refluxes with light oil, and water and light oil form azeotropic mixture and overflowed by cat head, goes into separator after the condensation cooling, divides the light oil after the water outlet to be back to dehydration tower, and dehydration of tar can be taken off to below 0.1% by original 0.5%.Tar after the dehydration can reduce the hear rate of Distallation systm, increases the throughput of equipment, reduces the Distallation systm resistance, improves cut and asphalt quality, alleviates equipment corrosion.Decompression shunting flow process is partly adopted in raw material prefractionation of the present invention, reduces cut point, slows down condensation, coking speed, the prolong operation cycle of inferior feedstock oil high-temperature heating process, and reactive moieties adopts cold minute flow process, simplifies flow process; Separation column and stabilizer tower flow process are partly adopted in fractionation
2. to have added light oil in coal tar be aromatic solvent in the present invention, make oil viscosity decline in the coal tar, the permeability of strainer is strengthened, cause the fracture of a part of macromolecule side chain and group in the coal tar simultaneously, filter effect is reduced to 0.012%. by original content of impurities 0.15%
3. because the aromaticity content in the light oil is very high, can make upgrading oil yield on original yield basis, improve 7%, increase the yield of light diesel fuel oil as the adjustable solidification agent of heavy oil at the bottom of the preliminary fractionator.
4. owing to adopted and wash carbolineum and return and join stock oil technology, not only improved gasification temperature (rising to-0.05MPa, 350 degree) by original-0.05MPa, 275 degree, making upgrading oil distillate productive rate has improved about 14%, from tar, steamed maximum naphthalenes, acenaphthene, fluorenes, anthracene, phenol, pyridine, quinoline etc. simultaneously, and output the very high middle temperature tar pitch of softening temperature.Increased economic benefit simultaneously.
The preparing fuel oil by coal tar hydrogenation process using prefractionation upgrading, four parts of hydrogen manufacturing and shortening and fractionation are finished, when the present invention adopts these four parts at the same time, the utilization ratio of stock oil is improved, for the first time light oil is mixed the coal system of system light diesel fuel oil with middle oily stock oil, not only reduce the hear rate of Distallation systm, the throughput of increase equipment, reduce the Distallation systm resistance, improve cut and asphalt quality, alleviate equipment corrosion, wash carbolineum simultaneously and return that to join stock oil technology be to have used for reference the petroleum products oil refining process, produce high-quality asphalt, in oil refinery technology is combined with the Coal Chemical Industry refinery in the low oily temperature preparing fuel oil by coal tar hydrogenation technological process.
In aromatic solvent and the coal tar oil (1: 20-1: 40) mix, underpressure distillation drops to modified coal-tar moisture content below 0.1% by original 0.5-1.0% by a certain percentage.The equipment corrosion and the interchanger coking of hydrogenation system have been slowed down.
7. because aromatic solvent has reduced the coal tar oil viscosity, filter at a certain temperature, oil product strengthens at the permeability of filter screen.The powdery mechanical impurity drops to about 0.012% by 0.15%.Slow down the coking time of hydrogenation reaction system, improved the quality or the bituminous purity of oil at the bottom of the preliminary fractionator simultaneously.Bituminous fragility is weakened.The isolating aromatic solvent of prefractionation cat head has not only reduced the moisture content of coal tar, also plays the effect of the adjustable solidification agent of heavy oil at the bottom of the preliminary fractionator.Increase the yield of upgrading oil, kept the flowability of heavy oil simultaneously.Or (1: 3-10) return and join, make yield yield in scheme one of upgrading oil reach 82-86% in the prefractionation system, improve closely 7%, yield reaches 86-90% in scheme two, improves nearly 11% by a certain percentage to wash the carbolineum fraction in the extraction of preliminary fractionator side line.Increased the material quantity of hydrogenation reaction, the output of high-grade fuel oil is increased, economic benefit obviously improves.
The specific embodiment of the present invention:
Embodiment 1:
Improved method for preparing fuel oil by coal tar hydrogenation, its composition comprises: prefractionation, hydrofining, fractionation, described prefractionation be aromatic solvent with coal tar in oil in proportion 1: 20-1: 40 mix, malleation removes by filter the solid particulate greater than 25 microns, tentatively remove the solid mechanical impurity, prevent the coking of interchanger and hydrogenator inlet, preliminary fractionator adopts negative-pressure operation, vacuum tightness-0.05MPa, the cat head evacuation adopts low-pressure steam as power, non-condensable gas in the prefractionation cat head return tank is extracted out, after after the evacuation system water cooler is cooled to 40 degree, enters skimming tank and carry out three phase separation, non-condensable gas enters atmosphere, and part oil is delivered to tank field hydrogenating materials oil measure jar by the emptying oil pump, sub-fraction oil 6-10: 1 is transported to full-bodied coal system heavy oil tank transfers sticking, the condensation point of the coal system of making heavy oil drops to the 35-42 degree by the 60-70 degree, and heavy oil goes heavy oil service tank to wait for that accent coagulates at the bottom of the prefractionation Tata.
Described improved method for preparing fuel oil by coal tar hydrogenation, upgrading oil removes hydrogenation reaction stock oil basin after the prefractionation, wait for hydrogenation, described hydrofining comprises hydrogenating desulfurization, hydrodenitrification, hydrogenation deoxidation, hydrogenation of olefins is saturated, aromatic hydrogenation is full to be closed, hydrocracking, hydrodemetallation (HDM), condensation reaction, particularly under the situation that catalyzer FH-98 exists, C-S takes place under the H2 effect, C-N and C-O bond rupture, and insatiable hunger is closed full the closing of hydro carbons and is waited and react (monoolefine: R-CH=CH2+H2 → R-CH2-CH3 diolefin: R-CH=CH-CH=CH2+2H2 → R-CH2-CH2-CH2-CH3).
Fractionation process is to enter separation column after the low branch oil that refining reaction partly comes is spent through heat exchange to 275, cat head oil gas enters separation column top return tank and carries out the oil gas water three phase separation after the condensation of separation column air cooler is cooled to 40 degree, the gas that flash distillation is come out drains into the fuel gas pipe network, sulfur-bearing contains the powerless sour water jar of ammonia sewage, an oil phase part is as trim the top of column, a part is removed stabilizer tower as thick gas and oil, diesel oil segmentation extraction at the bottom of the tower: a part is made the stabilizer reboiler thermal source and is added separation column through reboiler furnace, another part is cooled to 40 degree through heat exchange, and to go to the tank field be coal system light-weight fuel oil, going to the tank field greater than diesel oil at the bottom of the tower of 350 degree through heat exchange to 50 degree is that coal system heavy fuel oil (HFO) is a heavy gas oil, thick gas and oil enters further rectifying behind the stabilizer tower, obtains petroleum naphtha.
Claims (2)
1. improved method for preparing fuel oil by coal tar hydrogenation, its composition comprises: prefractionation, hydrofining, fractionation, it is characterized in that: described prefractionation be aromatic solvent with coal tar in oil in proportion 1: 20-1: 40 mix, malleation removes by filter the solid particulate greater than 25 microns, tentatively remove the solid mechanical impurity, prevent the coking of interchanger and hydrogenator inlet, preliminary fractionator adopts negative-pressure operation, vacuum tightness-0.05MPa, the cat head evacuation adopts low-pressure steam as power, non-condensable gas in the prefractionation cat head return tank is extracted out, after after the evacuation system water cooler is cooled to 40 degree, enters skimming tank and carry out three phase separation, non-condensable gas enters atmosphere, and part oil is delivered to tank field hydrogenating materials oil measure jar by the emptying oil pump, sub-fraction oil 6-10: 1 is transported to full-bodied coal system heavy oil tank transfers sticking, the condensation point of the coal system of making heavy oil drops to the 35-42 degree by the 60-70 degree, and heavy oil goes heavy oil service tank to wait for that accent coagulates at the bottom of the prefractionation Tata.
2. improved method for preparing fuel oil by coal tar hydrogenation according to claim 1, it is characterized in that: upgrading oil removes hydrogenation reaction stock oil basin after the prefractionation, wait for hydrogenation, described hydrofining comprises hydrogenating desulfurization, hydrodenitrification, hydrogenation deoxidation, hydrogenation of olefins is saturated, aromatic hydrogenation is full to be closed, hydrocracking, hydrodemetallation (HDM), condensation reaction, particularly under the situation that catalyzer FH-98 exists, C-S takes place under the H2 effect, C-N and C-O bond rupture, and insatiable hunger is closed full the closing of hydro carbons and is waited and react (monoolefine: R-CH=CH2+H2 → R-CH2-CH3 diolefin: R-CH=CH-CH=CH2+2H2 → R-CH2-CH2-CH2-CH3).
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| CNA2008100644520A CN101575533A (en) | 2008-05-06 | 2008-05-06 | Improved method for preparing fuel oil by coal tar hydrogenation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798523A (en) * | 2010-03-16 | 2010-08-11 | 李守春 | Auxiliary filtering method of heavy oil |
| CN102732304A (en) * | 2011-04-15 | 2012-10-17 | 中国石油化工股份有限公司 | Naphtha hydrogenation reaction device capable of prolonging running period and naphtha hydrogenation reaction method |
| CN102911728A (en) * | 2011-08-01 | 2013-02-06 | 中国石油化工股份有限公司 | Naphtha hydrogenation reaction system apparatus and hydrogenation reaction method |
| CN103160315A (en) * | 2013-04-12 | 2013-06-19 | 七台河宝泰隆圣迈煤化工有限责任公司 | Method for preparing tempered oil with ultralow condensation point from coal tar |
| CN103215089A (en) * | 2013-04-09 | 2013-07-24 | 陕西煤业化工技术研究院有限责任公司 | Device and method for cold-state separation of gas and solid in pulverized coal pyrolysis |
| CN104371760A (en) * | 2014-10-15 | 2015-02-25 | 上海建安化工设计有限公司 | Heavy benzene hydrogenation working circulation method |
| CN104673385A (en) * | 2015-02-16 | 2015-06-03 | 四川凯沃斯能源科技有限公司 | Method and system for processing coal tar |
| CN104673368A (en) * | 2015-02-16 | 2015-06-03 | 四川凯沃斯能源科技有限公司 | Method and system for removing mechanical impurities and ash contents in coal tar whole fraction |
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| CN1903994A (en) * | 2006-08-03 | 2007-01-31 | 湖南长岭石化科技开发有限公司 | Method of producing fuel oil by coal tar hydrogenation modifying |
| CN1952071A (en) * | 2005-10-19 | 2007-04-25 | 中国石油化工股份有限公司 | Combined method for producing cleaning oil from coal-tar oil |
| CN101012385A (en) * | 2007-02-06 | 2007-08-08 | 湖南长岭石化科技开发有限公司 | Pretreatment method of coal tar |
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Patent Citations (3)
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| CN1952071A (en) * | 2005-10-19 | 2007-04-25 | 中国石油化工股份有限公司 | Combined method for producing cleaning oil from coal-tar oil |
| CN1903994A (en) * | 2006-08-03 | 2007-01-31 | 湖南长岭石化科技开发有限公司 | Method of producing fuel oil by coal tar hydrogenation modifying |
| CN101012385A (en) * | 2007-02-06 | 2007-08-08 | 湖南长岭石化科技开发有限公司 | Pretreatment method of coal tar |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798523A (en) * | 2010-03-16 | 2010-08-11 | 李守春 | Auxiliary filtering method of heavy oil |
| CN102732304A (en) * | 2011-04-15 | 2012-10-17 | 中国石油化工股份有限公司 | Naphtha hydrogenation reaction device capable of prolonging running period and naphtha hydrogenation reaction method |
| CN102732304B (en) * | 2011-04-15 | 2014-07-23 | 中国石油化工股份有限公司 | Naphtha hydrogenation reaction device capable of prolonging running period and naphtha hydrogenation reaction method |
| CN102911728A (en) * | 2011-08-01 | 2013-02-06 | 中国石油化工股份有限公司 | Naphtha hydrogenation reaction system apparatus and hydrogenation reaction method |
| CN102911728B (en) * | 2011-08-01 | 2014-07-23 | 中国石油化工股份有限公司 | Naphtha hydrogenation reaction system apparatus and hydrogenation reaction method |
| CN103215089A (en) * | 2013-04-09 | 2013-07-24 | 陕西煤业化工技术研究院有限责任公司 | Device and method for cold-state separation of gas and solid in pulverized coal pyrolysis |
| CN103160315A (en) * | 2013-04-12 | 2013-06-19 | 七台河宝泰隆圣迈煤化工有限责任公司 | Method for preparing tempered oil with ultralow condensation point from coal tar |
| CN103160315B (en) * | 2013-04-12 | 2015-04-15 | 七台河宝泰隆圣迈煤化工有限责任公司 | Method for preparing tempered oil with ultralow condensation point from coal tar |
| CN104371760A (en) * | 2014-10-15 | 2015-02-25 | 上海建安化工设计有限公司 | Heavy benzene hydrogenation working circulation method |
| CN104673385A (en) * | 2015-02-16 | 2015-06-03 | 四川凯沃斯能源科技有限公司 | Method and system for processing coal tar |
| CN104673368A (en) * | 2015-02-16 | 2015-06-03 | 四川凯沃斯能源科技有限公司 | Method and system for removing mechanical impurities and ash contents in coal tar whole fraction |
| CN104673368B (en) * | 2015-02-16 | 2016-09-21 | 四川凯沃斯能源科技有限公司 | A kind of remove mechanical admixture and the method and system of ash in full fraction of coal tar |
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Application publication date: 20091111 |