CN101591561A - A kind of delay coking process - Google Patents
A kind of delay coking process Download PDFInfo
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- CN101591561A CN101591561A CNA2009100652610A CN200910065261A CN101591561A CN 101591561 A CN101591561 A CN 101591561A CN A2009100652610 A CNA2009100652610 A CN A2009100652610A CN 200910065261 A CN200910065261 A CN 200910065261A CN 101591561 A CN101591561 A CN 101591561A
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Abstract
The invention discloses a kind of delay coking process, to solve shortcomings such as the serious and liquid product yield of existing delay coking process heating-furnace coking is low.Its technology characteristics is: charging is heated to 360 ℃～460 ℃ in the convection chamber of process furnace or convection chamber and radiation chamber, enter the visbreaking reactor then and carry out cracking reaction, after reaction product is advanced the process furnace radiation chamber and is heated to 480 ℃～515 ℃, enter coking tower, the oil gas that goes out coking tower enters coking fractional distillation column and carries out fractionation.Use technology of the present invention can improve production efficiency of delayed coking liquid product, reduce coking yield, prolong the delayed coking unit on-stream time, reduce facility investment simultaneously.
Description
Technical field
The invention belongs to the refining of petroleum field, particularly a kind of delay coking process.
Background technology
Along with development of global economy, demand to lightweight, clean fuel oil also increases fast, and former oil quality along with the continuous increase of Oil extraction amount worse and worse, show mainly that density is big, viscosity is high, heavy metal content is high, sulphur content is high, nitrogen content is high, colloid and asphalt content height, this processing of the giving crude oil especially secondary processing of heavy oil has brought big difficulty.
At present, the processing of heavy oil to be taking off charcoal technology, and characteristics such as delay coking process has that the charcoal of taking off is thorough, flow process simple, technology maturation, plant investment are low have become one of important process of heavy oil upgrading.But along with the viscosity of processing heavy oil increases, carbon residue improves and the increase of pitch value content etc. brought challenge for the operation of delayed coking unit, product distribution variation not only, and heating furnace tube in coking further aggravate, have influence on the long-term operation of device.
For liquid product yield that improves delayed coking and the on-stream time that prolongs delayed coking, the refining of petroleum investigator has researched and developed relevant Technology.
EP209225A2 discloses a kind of residual oil solvent deasphalting-delayed coking combined technical method, utilize the solvent that is not recovered in the de-oiled asphalt in the coking heater boiler tube, to vaporize to improve the oil gas linear speed in the boiler tube, to alleviate the coking situation in the boiler tube, and utilize delayed coking unit to reclaim solvent in the de-oiled asphalt, reach purpose of energy saving.
CN00124904.5 discloses the combined method of a kind of shallow degree solvent deasphalting and delayed coking, and the part or all of and optional conventional coking raw material of de-oiled asphalt enters the process furnace of delayed coking unit, enters coking tower then and carries out pyrogenic reaction.This method has been improved the feed properties of delayed coking unit with after easily the small part bituminous matter of coking is taken off in the residual oil, the liquid product yield of delayed coking is increased, and prolonged the on-stream time of delayed coking unit.
Patent US4455219, US4784744, US5006223, US4378288, US4518487, CN01143254.3, CN200410050791.5, CN99125284.5, CN03133538.1, CN02139673.6, CN02109408.X etc. mainly are to utilize lower boiling material part or all replace heavy recycle stock, or in the coking charging, add method such as free radical material and improve the liquid yield of delayed coking, reduce the yield of coke.
US4443325 utilizes visbreaking and pyrogenic combination process, and after the fractionation of visbreaking distilled oil, visbreaking residue is as the charging of delayed coking unit, and to improve the yield of liquid, this combination process flow process is longer, plant investment height not only, and its process cost is also high.
CN98117809.X discloses a kind of thermocracking process of heavy oil, is that wax tailings enters to relax in the thermal cracking reactor and reacts with delayed coking and the associating of mitigation thermocracking process, and the oil gas of generation is with the coking oil gas fractionation.Unconverted oil turns back to coker as turning oil.This technology has improved the yield of lightweight oil, can make diesel oil increase by 5～15 percentage points, but liquid receives and decrease, and improves little to the coking tendency of heating furnace tube.
CN98117811.1 discloses a kind of improved delay coking process, is coking raw material oil is relaxed thermally splitting earlier, and the low-boiling point material that obtains 5V%～15V% enters coke drum then and carries out degree of depth thermally splitting as hydrogen supply agent and thinner.Adopt this technology can alleviate the coking of coking heater boiler tube, improve liquid product yield, but this processing method is made up of two process furnace, invest corresponding with energy consumption higher, and defocusing process furnace after turning oil mixes with the visbreaking generation is oily, this is concerning the charging inferior of viscosity higher, and the coking of coking heater boiler tube tendency becomes big.
Summary of the invention
A kind of new delay coking process that The present invention be directed to the shortcoming of prior art and propose, specifically, this technology is that visbreaking and two kinds of technologies of coking are organically combined a kind of Technology of handling heavy oil, use technology of the present invention can improve production efficiency of delayed coking liquid product, reduce coking yield, prolong the delayed coking unit on-stream time, reduce facility investment simultaneously.
The invention provides a kind of delay coking process, the steps include:
1) is heated to 360 ℃～460 ℃ in stock oil and the convection chamber that enters process furnace after turning oil mixes or convection chamber and the radiation chamber, preferred 380～430 ℃, enter the visbreaking reactor then, in visbreaking reactor head gauge pressure is that 0.45～3.0MPa, the residence time are 6～210min, carries out cracking reaction under the condition of preferred 30～120min;
2) after the oil gas that comes out from the visbreaking reactor top radiation chamber that enters the described process furnace of step 1) is heated to 480 ℃～515 ℃, enter coking tower and carry out pyrogenic reaction, coking tower cat head gauge pressure is 0.103～1.0MPa, filling the burnt time is 3～48hr, the high-temperature oil gas that goes out coking tower is gone the coking fractional distillation column fractionation, extract turning oil out from the coking fractional distillation column bottom, partly or entirely turning oil mixes with stock oil as coking recycle oil, and the weight ratio of coking recycle oil and stock oil is 0～1.0: 1.0.
The invention provides another kind of delay coking process, the steps include:
1) stock oil enters coking fractional distillation column, the logistics of coming out in coking fractional distillation column bottom enters in the convection chamber of process furnace or convection chamber and the radiation chamber and is heated to 360 ℃～460 ℃, preferred 380～430 ℃, enter the visbreaking reactor then, in visbreaking reactor head gauge pressure is that 0.45～3.0MPa, the residence time are 6～210min, carry out cracking reaction under the condition of preferred 30～120min, the logistics of coming out in wherein said coking fractional distillation column bottom and the weight ratio of stock oil are 1.05～2.0: 1.0;
2) after the oil gas that comes out from the visbreaking reactor top radiation chamber that enters the described process furnace of step 1) is heated to 480 ℃～515 ℃, enter coking tower and carry out pyrogenic reaction, coking tower cat head gauge pressure is 0.103～1.0MPa, filling the burnt time is 3～48hr, and the high-temperature oil gas that goes out coking tower is gone the coking fractional distillation column fractionation.
Stock oil of the present invention comprises the extraction oil of vacuum residuum, long residuum, heavy crude, decompressed wax oil, de-oiled asphalt, deasphalted oil, residual hydrogenation heavy oil, thermal cracking residue, lube oil finishing, the turning oil of catalytic cracking and more than one mixtures in clarified oil, cracking of ethylene residual oil and the tar-bitumen etc.
Also can add materials such as lower boiling material or adding free radical compounds in the described stock oil.
Coking recycle oil of the present invention is light wax tailings, heavy wax tailings or with light wax tailings of arbitrary proportion blended and heavy wax tailings mixture.
The cut point of light wax tailings of the present invention and heavy wax tailings is 400 ℃～500 ℃.
Described visbreaking reactor comprises tower reactor and shell-and-tube reactor.When being tower reactor, reactor, the also series connection of two above reactors.
The present invention compared with prior art has the following advantages:
1. compared with prior art, identical in coking heater radiation chamber temperature out, the coking tower tower top pressure is identical and the essentially identical operational condition of recycle ratio under, use the present invention can improve the liquid product yield of coking tower, reduce coke yield.
2. coking charging of the present invention is through the laggard process furnace radiation chamber heating of visbreaking, the viscosity of process furnace radiation chamber charging is significantly lowered, and the low boiler cut that produces behind the visbreaking (comprising gas) can preferentially be vaporized in radiating furnace tube, not only improved the flow velocity of logistics in the radiation chamber boiler tube, also improved the flow state of logistics in the radiation chamber boiler tube, thereby suppressed generation and the deposition of coking precursor, prolonged the cycle of operation of delayed coking unit at radiation chamber.
3. the low boiler cut hydrogen richness that produces after by visbreaking of coking charging is higher, is good hydrogen supply agent and thinner, thereby has optimized the character of process furnace radiation chamber charging.
4. adaptability of the present invention is strong, can process raw material more inferior.
5. the present invention has significantly energy-conservation and reduces results form investment.The heat that visbreaking process of the present invention and coking need is only provided by same process furnace, therefore can significantly improve the utilization ratio of heat, also can reduce investment simultaneously.
With the drawings and specific embodiments the present invention is described in further detail below, but do not limit the scope of the invention, those skilled in the art can be according to raw material properties, and the requirement of purpose product is easy to select appropriate operational parameters within the scope of the present invention.
Accompanying drawing and description of drawings
Fig. 1 is a kind of delay coking process simple flow chart of the present invention.
Fig. 2 is the another kind of delay coking process simple flow chart of the present invention.
Among the figure: 1---process furnace, 2---the visbreaking reactor, 3---the 1# coking tower, 4---the 2# coking tower, 5---coking fractional distillation column, 6---stock oil, 7---coking recycle oil, 8---feeding line, 9---coking fractional distillation column tower base stream pipeline, 10---high-temperature oil gas.
Embodiment
As shown in Figure 1, coking recycle oil 7 mixes with stock oil 6 after feeding line 8 enters in the convection chamber of process furnace 1 or convection chamber and the radiation chamber heats, be heated to 360 ℃～460 ℃, enter visbreaking reactor 2 bottoms after preferred 380～430 ℃, in visbreaking reactor head gauge pressure is 0.45～3.0MPa, the residence time is 6～210min, carry out cracking reaction under the condition of preferred 30～120min, the reaction oil gas that comes out from visbreaking reactor 2 tops enters the radiation chamber heating of process furnace 1, be heated to the bottom that enters 1# coking tower 3 after 480 ℃～515 ℃, treat that 1# coking tower 3 fills after Jiao finishes, feed switched is to 2# coking tower 4,1# coking tower 3 carries out the decoking processing at this moment, 2# coking tower 4 fills Jiao, repeat said process, the cat head gauge pressure of 1# coking tower 3 and 2# coking tower 4 is 0.103～1.0MPa, filling the burnt time is 3～48hr, the coke that generates is stayed in the coking tower, the high-temperature oil gas 10 of coming out from the coking tower cat head enters from coking fractional distillation column 5 bottoms carries out fractionation, clean or white is told on coking fractional distillation column 5 tops, extract turning oil out from coking fractional distillation column 5 bottoms, partly or entirely turning oil mixes with stock oil 6 as coking recycle oil 7, and coking recycle oil 7 is 0～1.0: 1.0 with the weight ratio of stock oil.The present invention shown in Figure 1 is a conventional stove two tower flow processs, also can adopt flow processs such as two stoves, four towers certainly, and this is techniques well known.
Fig. 2 is the another kind of simple process flow diagram of the present invention, the difference of itself and Fig. 1 is that stock oil 6 enters coking fractional distillation column 5, the logistics of coming out in coking fractional distillation column 5 bottoms enters in the convection chamber of process furnace 1 or convection chamber and the radiation chamber through coking fractional distillation column tower base stream pipeline 9 and heats, and the logistics of coming out in wherein said coking fractional distillation column 5 bottoms and the weight ratio of stock oil 6 are 1.05～2.0: 1.0.
Embodiment
Following embodiment has selected two heavy oil samples, has investigated the correlated result of the present invention and prior art respectively.
Embodiment 1:
130 ℃ heavy oil I (its character sees Table 1) preheats stove (being the convection chamber and the radiation chamber of delayed coking full scale plant process furnace) and heats with entering after turning oil from coking fractional distillation column mixes through pump pressurization, the water vapor injection rate 0.82% that preheats stove (accounts for the amount of heavy oil, down together), it is 417 ℃ that control preheats the outlet of still material temperature, enter the upflow visbreaking reactor then and carry out visbreaking, the residence time of material in the visbreaking reactor is 42min, visbreaking reactor head temperature is 408 ℃, and gauge pressure is 0.53MPa (to overcome the resistance of system).
The visbreaking mixture that goes out the visbreaking reactor enters process furnace (being the radiation chamber of delayed coking full scale plant process furnace) heating, and process furnace is water filling steam 0.70% again, and the outlet oil temperature of control process furnace is 498 ℃, enters coking tower then and carries out cracking and condensation reaction.The coke that generates is stayed in the coking tower, and the high-temperature oil gas that goes out coking tower enters coking fractional distillation column behind chilling separates, and turning oil turns back to through pump and preheats the stove heating.The operational condition of technology of the present invention and product distribute and list in table 2.
Comparative Examples 1:
130 ℃ heavy oil I (character is with embodiment 1) preheats stove (being the convection chamber of delayed coking full scale plant process furnace) and heats with entering after turning oil from coking fractional distillation column mixes through pump pressurization, enter process furnace (being the radiation chamber of delayed coking full scale plant process furnace) heating then with after 1.55% high-temperature water vapor mixes, the outlet oil temperature of control process furnace is 498 ℃, enters coking tower then and carries out cracking and condensation reaction.The operational condition of its delayed coking unit and product distribute and list in table 2 (existing delay coking process).
As seen from Table 2, adopt the same heavy oil I of this patent method processing to compare with existing technology, light oil yield increases by 0.77 percentage point, and liquid is received increases by 2.85 percentage points.
The main character of table 1 embodiment 1 and Comparative Examples 1 charging heavy oil I
Table 2 embodiment 1 contrasts with the operational condition and the product distribution of Comparative Examples 1
Embodiment 2:
The visbreaking condition is with embodiment 1, but the charging of visbreaking does not comprise turning oil.Visbreaking mixture behind the heavy oil I visbreaking is through cooling, separation and analysis, and the product that obtains distributes and the main character of visbreaker tar is listed in table 3.
Contrast table 1 and table 3, the viscosity of 80 ℃ of visbreaker tars and 100 ℃ is 51.98% and 47.64% of stock oil, the visbreaking effect is obvious.
The product distribution of table 3 heavy oil I visbreaking and the main character of visbreaker tar
Embodiment 3:
Coking tendency behind heavy oil and the visbreaking thereof in heating furnace tube is investigated.
Test principle: adopt traditional hot dirty method (temperature differential method) to estimate the coking tendency of heavy oil in heating furnace tube, its principle is to descend according to heat transfer efficiency behind the dirty testing tube of Jiao (heating furnace tube) coking and fouling, thereby the coking tendency of heavy oil is investigated in the corresponding reduction of temperature after making fluid by the dirty testing tube of Jiao.
Test method: during on-test, stock oil is extracted out from head tank, imported burnt dirty testing tube with pump.The control furnace temp is constant, and stock oil flow velocity and testing tube ingress stock oil temperature are remained unchanged in entire test.When the test beginning, no incrustation in the burnt dirty testing tube, the entire thermal resistance minimum, it is maximum that process furnace is passed to the fluidic heat, thereby burnt dirty testing tube fluid outlet temperature is the highest.Along with the carrying out of test, burnt dirt deposition on the test tube wall increases, and heat transmission resistance increases thereupon, and fluid gained heat reduces gradually.Under the certain condition of process furnace power, keep fluid inlet temperature and constant flow rate, fluid outlet temperature is inevitable to descend thereupon.So the fluid outlet temperature during on-test when fluid outlet temperature and off-test has a temperature head Δ T, when burnt dirt increased, temperature head Δ T was big more.
The heavy oil II (character sees Table 4) that process of the test is one: 180 ℃ enters with a certain amount of flow velocity through the pump pressurization and preheats stove (being the convection chamber and the radiation chamber of delayed coking full scale plant process furnace) heating, it is 406 ℃ that control preheats the outlet of still material temperature, enter the upflow visbreaking reactor and carry out visbreaking, the residence time of material in the visbreaking reactor is 60min, and visbreaking reactor head temperature is 395 ℃.Enter process furnace (radiation chamber) heating then.The inlet temperature that this logistics enters process furnace is 390 ℃, and the output rating of quick adjustment process furnace makes the outlet material temperature begin to be stabilized in 496 ℃, and the output rating of keeping process furnace then is constant.Operational condition and test-results see Table 5.
The heavy oil II that process of the test is two: 180 ℃ enters with a certain amount of flow velocity through the pump pressurization and preheats the stove heating, and the inlet temperature that the control logistics enters process furnace is 390 ℃, and below operation is with process of the test one.Operational condition and test-results are with seeing Table 5.
As seen from Table 5, under same coking evaluation test condition, adopt patent of the present invention, the coking tendency in its boiler tube is obviously slowed down.
The main character of table 4 embodiment 3 charging heavy oil II
The coking tendency test of table 5 heavy oil II boiler tube in technology of the present invention and existing technology
Claims (10)
1, a kind of delay coking process is characterized in that comprising the steps:
1) is heated to 360 ℃～460 ℃ in stock oil and the convection chamber that enters process furnace after turning oil mixes or convection chamber and the radiation chamber, entering the visbreaking reactor then, is 0.45～3.0MPa, the residence time to be to carry out cracking reaction under the condition of 6～210min in visbreaking reactor head gauge pressure;
2) after the oil gas that comes out from the visbreaking reactor top radiation chamber that enters the described process furnace of step 1) is heated to 480 ℃～515 ℃, enter coking tower and carry out pyrogenic reaction, coking tower cat head gauge pressure is 0.103～1.0MPa, filling the burnt time is 3～48hr, the high-temperature oil gas that goes out coking tower is gone the coking fractional distillation column fractionation, extract turning oil out from the coking fractional distillation column bottom, partly or entirely turning oil mixes with stock oil as coking recycle oil, and the weight ratio of coking recycle oil and stock oil is 0～1.0: 1.0.
2, technology according to claim 1 is characterized in that: Heating temperature described in the step 1) is 380～430 ℃, and the residence time in the visbreaking reactor is 30～120min.
3, technology according to claim 1 is characterized in that: the visbreaking reactor is tower reactor or shell-and-tube reactor.
4, according to claim 1 or 3 described technologies, it is characterized in that: when the visbreaking reactor was tower reactor, the visbreaking reactor was the series connection of a reactor or two above reactors.
5, technology according to claim 1 is characterized in that: described stock oil is the extraction oil of vacuum residuum, long residuum, heavy crude, decompressed wax oil, de-oiled asphalt, deasphalted oil, residual hydrogenation heavy oil, thermal cracking residue, lube oil finishing, the turning oil of catalytic cracking and more than one mixtures in clarified oil, cracking of ethylene residual oil and the tar-bitumen.
6, a kind of delay coking process is characterized in that comprising the steps:
1) stock oil enters coking fractional distillation column, the logistics of coming out in coking fractional distillation column bottom enters in the convection chamber of process furnace or convection chamber and the radiation chamber and is heated to 360 ℃～460 ℃, enter the visbreaking reactor then, in visbreaking reactor head gauge pressure is 0.45～3.0MPa, the residence time is to carry out cracking reaction under the condition of 6～210min, and the logistics of coming out in wherein said coking fractional distillation column bottom and the weight ratio of stock oil are 1.05～2.0: 1.0;
2) after the oil gas that comes out from the visbreaking reactor top radiation chamber that enters the described process furnace of step 1) is heated to 480 ℃～515 ℃, enter coking tower from the coking tower bottom, coking tower cat head gauge pressure is 0.103～1.0MPa, filling the burnt time is 3～48hr, and the high-temperature oil gas that goes out coking tower is gone the coking fractional distillation column fractionation.
7, technology according to claim 6 is characterized in that: Heating temperature described in the step 1) is 380～430 ℃, and the residence time in the visbreaking reactor is 30～120min.
8, technology according to claim 6 is characterized in that: the visbreaking reactor is tower reactor or shell-and-tube reactor.
9, according to claim 6 or 8 described technologies, it is characterized in that: when the visbreaking reactor was tower reactor, the visbreaking reactor was the series connection of a reactor or two above reactors.
10, technology according to claim 6 is characterized in that: described stock oil comprises the extraction oil of vacuum residuum, long residuum, heavy crude, decompressed wax oil, de-oiled asphalt, deasphalted oil, residual hydrogenation heavy oil, thermal cracking residue, lube oil finishing, the turning oil of catalytic cracking and more than one mixtures in clarified oil, cracking of ethylene residual oil and the tar-bitumen.
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| CN102234533A (en) * | 2010-05-05 | 2011-11-09 | 中国石油化工集团公司 | Delayed coking method |
| CN102358846A (en) * | 2011-09-19 | 2012-02-22 | 中国石油天然气股份有限公司 | Heavy oil hydrogen supply viscosity reduction-coking combined process method |
| CN102443428A (en) * | 2010-10-13 | 2012-05-09 | 中国石油化工股份有限公司 | Heavy-hydrocarbon hydrogenation treatment method |
| CN102732297A (en) * | 2011-04-12 | 2012-10-17 | 中国石油化工股份有限公司 | Method for delaying coking |
| CN103062888A (en) * | 2012-12-28 | 2013-04-24 | 武汉保华石化新材料开发有限公司 | Heating furnace for processing aromatic hydrocarbon oils from heavy components of petroleum |
| CN103805226A (en) * | 2012-11-02 | 2014-05-21 | 中国石油化工集团公司 | Delayed coking method |
| CN104927920A (en) * | 2014-03-21 | 2015-09-23 | 中国石油化工股份有限公司 | Residue oil coking method |
| WO2015199797A1 (en) * | 2014-05-01 | 2015-12-30 | Exxonmobil Research And Engineering Company | Methods and systems for improving liquid yields and coke morphology from a coker |
| CN107974273A (en) * | 2016-10-25 | 2018-05-01 | 中国石油化工股份有限公司 | A kind of method of heavy oil visbreaking |
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| US5006223A (en) * | 1989-09-29 | 1991-04-09 | Exxon Research And Engineering Company | Addition of radical initiators to resid conversion processes |
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| CN102234533A (en) * | 2010-05-05 | 2011-11-09 | 中国石油化工集团公司 | Delayed coking method |
| CN102234533B (en) * | 2010-05-05 | 2014-01-01 | 中国石油化工集团公司 | Delayed coking method |
| CN102443428A (en) * | 2010-10-13 | 2012-05-09 | 中国石油化工股份有限公司 | Heavy-hydrocarbon hydrogenation treatment method |
| CN102443428B (en) * | 2010-10-13 | 2014-10-15 | 中国石油化工股份有限公司 | Heavy-hydrocarbon hydrogenation treatment method |
| CN102732297B (en) * | 2011-04-12 | 2014-08-13 | 中国石油化工股份有限公司 | Method for delaying coking |
| CN102732297A (en) * | 2011-04-12 | 2012-10-17 | 中国石油化工股份有限公司 | Method for delaying coking |
| CN102358846A (en) * | 2011-09-19 | 2012-02-22 | 中国石油天然气股份有限公司 | Heavy oil hydrogen supply viscosity reduction-coking combined process method |
| CN103805226B (en) * | 2012-11-02 | 2016-05-11 | 中国石油化工集团公司 | A kind of delayed coking method |
| CN103805226A (en) * | 2012-11-02 | 2014-05-21 | 中国石油化工集团公司 | Delayed coking method |
| CN103062888B (en) * | 2012-12-28 | 2015-01-21 | 武汉保华石化新材料开发股份有限公司 | Heating furnace for processing aromatic hydrocarbon oils from heavy components of petroleum |
| CN103062888A (en) * | 2012-12-28 | 2013-04-24 | 武汉保华石化新材料开发有限公司 | Heating furnace for processing aromatic hydrocarbon oils from heavy components of petroleum |
| CN104927920A (en) * | 2014-03-21 | 2015-09-23 | 中国石油化工股份有限公司 | Residue oil coking method |
| CN104927920B (en) * | 2014-03-21 | 2017-03-15 | 中国石油化工股份有限公司 | A kind of residuum coking method |
| WO2015199797A1 (en) * | 2014-05-01 | 2015-12-30 | Exxonmobil Research And Engineering Company | Methods and systems for improving liquid yields and coke morphology from a coker |
| CN107974273A (en) * | 2016-10-25 | 2018-05-01 | 中国石油化工股份有限公司 | A kind of method of heavy oil visbreaking |
| CN107974273B (en) * | 2016-10-25 | 2021-02-09 | 中国石油化工股份有限公司 | Heavy oil viscosity reducing method |
| CN116855307A (en) * | 2023-07-06 | 2023-10-10 | 新疆聚力环保科技有限公司 | Prehydrogenation process for waste mineral oil |
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