CN105199775A - Solvent dewaxing method - Google Patents
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- CN105199775A CN105199775A CN201410293426.0A CN201410293426A CN105199775A CN 105199775 A CN105199775 A CN 105199775A CN 201410293426 A CN201410293426 A CN 201410293426A CN 105199775 A CN105199775 A CN 105199775A
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Abstract
The invention discloses a solvent dewaxing method. The method comprises the following steps: under dewaxing conditions, carrying out solvent dewaxing on the mixture of raw oil and a diluted dewaxing solvent, so as to obtain dewaxing filtrate and ceratum; the diluted dewaxing solvent contains C3-C6 aliphatic ketones, C6-C8 aromatic hydrocarbon and an auxiliary solvent; the auxiliary solvent is water and/or C1-C6 monohydric alcohol. According to the invention, a certain amount of the auxiliary solvent is added to the mixed diluted dewaxing solvent containing C3-C6 aliphatic ketones and C6-C8 aromatic hydrocarbon, so as to improve the selectivity of the solvent to the high condensation point components in the raw oil, reduce the dewaxing temperature difference, increase the filtration speed, reduce the energy consumption of a solvent dewaxing device, and meanwhile meet the low pour point requirements of the obtained dewaxed oil.
Description
Technical field
The present invention relates to a kind of method of solvent dewaxing.
Background technology
In order to keep the low-temperature fluidity of lubricating oil, in the production process of lubricant base, needing to remove high condensation point component contained in stock oil, reduce its condensation point or pour point.Generally speaking, the high condensation point component of producing in Lube basic oil material feedstocks is mainly normal paraffin, isoparaffin and with the naphthenic hydrocarbon of long side chain or aromatic hydrocarbons.The method of lubricating oil dewaxing has a variety of, and wherein the most frequently used is solvent dewaxing process.The principle of solvent dewaxing be exactly by stock oil and dewaxing solvent miscible, then progressively cool, utilize solvent at low temperatures to the dissolubility difference of high condensation point wax component and other component, make high condensation point wax component crystallization in the mixing solutions of raw material and solvent, finally carry out filtering separation, obtain low condensation point oil.
Solvent dewaxing technology not only may be used for removing high condensation point wax component in Lube basic oil material feedstocks, also may be used for being separated high condensation point component in other oil product.For different oil products, due to the high content of condensation point component and the difference of molecular structure thereof of stock oil, and product is different to the requirement of condensation point, and its solvent dewaxing process has larger difference.Such as: producing in the process of environment-friendly rubber extending oil with furfural extract oil, first must remove the high condensation point component of extracting out in oil, then just can it can be used as the raw materials for production of environment-friendly rubber extending oil.
No matter lubricant base solvent dewaxing, or the low content of wax extracts the solvent dewaxing of oil or fluid catalytic cracking decant oil out, usually adopts the mixture of butanone and toluene as dewaxing solvent.Although can according to raw material oil properties and wax content height thereof, by regulating the ratio of butanone and toluene in dewaxing solvent, reduce dewaxing differential (i.e. the condensation point of pressed oil and the difference of dewaxing filtration temperature), thus reduction energy consumption, but Conventional solvents dewaxes, the pressed oil condensation point that obtains is still high than dewaxing temperature 9 DEG C-15 DEG C.In order to make pressed oil condensation point reach requirement, need that dewaxing slurries are reduced to lower temperature and carry out filtration dewaxing, energy consumption is high on the one hand, on the other hand, dewaxing filtration temperature is too low, also may occur because oil is insoluble to solvent, and produce the phenomenon of third phase, will greatly reduce the yield of pressed oil.
Summary of the invention
The object of the invention is to overcome existing solvent dewaxing and produce pressed oil technology dewaxing differential large (condensation point of pressed oil is large with the difference of dewaxing filtration temperature), energy consumption is high, the defect that pressed oil condensation point is high under dewaxing temperature, and provide a kind of dewaxing differential little, energy consumption is little, the method for the solvent dewaxing that pressed oil condensation point is low under dewaxing temperature.
To achieve these goals, the invention provides a kind of method of solvent dewaxing, the method comprises under dewaxing conditions, stock oil and the mixture of dewaxing diluting solvent are carried out solvent dewaxing, obtain dewaxed filtrate and slack wax, wherein, described dewaxing diluting solvent contains the aliphatic ketone of C3-C6, the aromatic hydrocarbon of C6-C8 and secondary solvent, and described secondary solvent is the monohydroxy-alcohol of water and/or C1-C6.
The present inventor adopts and add a certain amount of secondary solvent in the mixed solvent of the aliphatic ketone of diluting solvent C3-C6 that dewaxes, the aromatic hydrocarbon of C6-C8, improve the selectivity of solvent to condensation point component high in stock oil, reduce dewaxing differential, improve filtration velocity, and then reduce solvent dewaxing unit energy consumption, meet the low condensation point requirement of the pressed oil obtained simultaneously.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the block diagram of the stock oil dewaxing of a kind of preferred implementation of the present invention.
Description of reference numerals
1 stock oil pipeline; 2 secondary solvent line; 3 dewaxing diluting solvent pipelines; 4 solvents and stock oil mixing device; 5 solvents and stock oil mixture pipeline; 6 mixture cooling systems; 7 dewaxing filter feed line; 8 dewaxing filters; 9 oil-containing slack wax pipelines; 10 oil-containing slack wax solvent recovery units; 11 gatch line of pipes; 12 filtrate line; 13 filtrate solvent retrieving arrangements; 14 pressed oil line of pipes.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
According to the present invention, the method of described solvent dewaxing comprises: under dewaxing conditions, stock oil and the mixture of dewaxing diluting solvent are carried out solvent dewaxing, obtain dewaxed filtrate and slack wax, wherein, described dewaxing diluting solvent contains the aliphatic ketone of C3-C6, the aromatic hydrocarbon of C6-C8 and secondary solvent, and described secondary solvent is the monohydroxy-alcohol of water and/or C1-C6.
In the present invention, described solvent dewaxing refers to and is dewaxed under dewaxing conditions by the mixture of stock oil with dewaxing diluting solvent.Described dewaxing refers to: the mixture of stock oil with dewaxing diluting solvent is refrigerated to low temperature (dewaxing temperature of Dewaxing conditions) and filters, the wax (high condensation point component) of separating out from dewaxing fluid under low temperature is separated, obtains the process of dewaxed filtrate and slack wax.
According to the present invention, the process of described solvent dewaxing is: mixed with described dewaxing diluting solvent by stock oil, its mixture cools gradually, in temperature-fall period, in stock oil, high condensation point component is separated out gradually, is cooled to filtration temperature and filters, and obtains solid phase slack wax and liquid phase dewaxed filtrate.Under preferable case, after dewaxed filtrate being removed solvent, the pressed oil after condensation point can be reduced; By solid phase slack wax desolvation, obtain gatch.
Dewaxing diluting solvent of the present invention contains the aliphatic ketone of C3-C6, the aromatic hydrocarbon of C6-C8 and secondary solvent, and described secondary solvent is the monohydroxy-alcohol of water and/or C1-C6, and described dewaxing solvent is the tertiary mixture of ketone, aromatic hydrocarbon and secondary solvent.Adopt method of the present invention effectively can improve dewaxing diluting solvent to the selectivity of condensation point component high in stock oil, reduce dewaxing differential, improve filtration velocity, and the low condensation point requirement of the pressed oil obtained can be met.
According to the present invention, described secondary solvent can be water, can also be the monohydroxy-alcohol of C1-C6, can also be the mixture of the monohydroxy-alcohol of water and C1-C6.If described secondary solvent is the mixture of the monohydroxy-alcohol of water and C1-C6, in order to meet dewaxing diluting solvent better to the selectivity of high condensation point component, with the cumulative volume of the mixture of the monohydroxy-alcohol of water and C1-C6 for benchmark, the volume content of water is 2% to 50%, the volume content of the monohydroxy-alcohol of C1-C6 is 50% to 98%, further preferably, with the cumulative volume of the mixture of the monohydroxy-alcohol of water and C1-C6 for benchmark, the volume content of water is the volume content of the monohydroxy-alcohol of 5% to 40%, C1-C6 is 60% to 95%.
According to the present invention, wherein, the monohydroxy-alcohol of described C1-C6 be preferably selected from methyl alcohol, ethanol, n-propyl alcohol, Virahol, propyl carbinol and isopropylcarbinol one or more, more preferably, be selected from ethanol, n-propyl alcohol and Virahol one or more.
According to the present invention, the common practise that the aliphatic ketone of the C3-C6 in described dewaxing diluting solvent and the aromatic hydrocarbon of C6-C8 can be grasped according to those skilled in the art carries out appropriate selection, such as, the aliphatic ketone of described C3-C6 is preferably acetone and/or butanone, the aromatic hydrocarbon of described C6-C8 is preferably benzene and/or toluene, preferred employing is little and solvent that is that almost all dissolve oil to wax solubleness, namely, the aliphatic ketone of the C3-C6 in described dewaxing diluting solvent is butanone, the aromatic hydrocarbon of C6-C8 is toluene, i.e. the mixture of butanone, toluene and secondary solvent.
According to the present invention, with the cumulative volume of the aromatic hydrocarbon of the aliphatic ketone of C3-C6, C6-C8 and secondary solvent for benchmark, the volume content of the aliphatic ketone of C3-C6 and the aromatic hydrocarbon of C6-C8 is 85-99%, the volume content of secondary solvent is 1-15%, more preferably, with the cumulative volume of the aromatic hydrocarbon of the aliphatic ketone of C3-C6, C6-C8 and secondary solvent for benchmark, the volume content of the aliphatic ketone of C3-C6 and the aromatic hydrocarbon of C6-C8 is 90-95%, and the volume content of secondary solvent is 5-10%.
According to the present invention, with the cumulative volume of the aromatic hydrocarbon of the aliphatic ketone of C3-C6, C6-C8 for benchmark, the alkenolic volume content of C3-C6 is preferably 45% to 90%, the volume content of the aromatic hydrocarbon of C6-C8 is preferably 10% to 55%, further preferably, with the cumulative volume of the aromatic hydrocarbon of the aliphatic ketone of C3-C6, C6-C8 for benchmark, the alkenolic volume content of C3-C6 is the volume content of the aromatic hydrocarbon of 50% to 80%, C6-C8 is 20% to 50%.
The aliphatic ketone of the C3-C6 in above-mentioned content range is preferably butanone, and the aromatic hydrocarbon of C6-C8 is preferably toluene.
According to the present invention, the mixing to be mixed by pipeline of aliphatic ketone in described dewaxing diluting solvent, aromatic hydrocarbon and secondary solvent is fully mixed through static mixer again, also can be injected in solvent tank by a certain percentage, then mix through mechanical stirring.
According to the present invention, the condition of described dewaxing comprises the temperature of solvent dewaxing, the temperature of this solvent dewaxing will ensure separated out from dewaxing fluid by wax and can make it filtering separation, therefore, the temperature of described solvent dewaxing is generally below zero degrees celsius, after have employed dewaxing diluting solvent of the present invention, the selectivity of solvent to high condensation point component can be improved, therefore, the temperature of solvent dewaxing can be improved, thus reduce dewaxing differential, the low condensation point requirement of the pressed oil obtained can also be ensured, and reduce energy consumption.Therefore, the temperature of solvent dewaxing is-15 DEG C to 20 DEG C, is preferably-10 DEG C to 10 DEG C.
Described stock oil preferably controls, into (0.5 DEG C-10 DEG C)/min, to be more preferably (1 DEG C-5 DEG C)/min with the cooling rate in the temperature-fall period of the mixture of dewaxing diluting solvent.
According to the present invention, the condition of described dewaxing also comprises: the mass ratio of dewaxing diluting solvent and stock oil, the consumption of described dewaxing diluting solvent suitably can adjust according to Dewaxing conditions, preferably, the mass ratio of described dewaxing diluting solvent and stock oil is 1:1 to 10:1, is more preferably 2:1 to 5:1.
According to the present invention, stock oil is mixed to get by stock oil and the diluting solvent that dewaxes with the mixture of dewaxing diluting solvent, in the process of carrying out solvent dewaxing, needs first fully to be melted by stock oil, then carries out solvent dewaxing under dewaxing conditions.At thawing stock oil and in solvent dewaxing process, described diluting solvent can once add, and also can be divided into and repeatedly adding, preferably be divided into 2-4 time and add.According to the character of dewaxed feedstock, those skilled in the art can easily determine to melt the temperature of stock oil, the additional proportion of each diluting solvent.In addition, according to the viscosity of the material that dewaxes in subcooling dewaxing process, what those skilled in the art easily can determine each diluting solvent adds temperature.
According to the present invention, the method also comprises slack wax desolvation, obtains gatch; Dewaxed filtrate is removed solvent, is reduced the pressed oil after condensation point.
According to the present invention, the method being separated solvent in dewaxed filtrate and slack wax is well known in the art, such as, (solvent recovery process for filtrate is entered the first evaporator tower through repeatedly heat exchange, after evaporating partial solvent, carry out second time and evaporate by boosting intensification material to be sent into respectively solvent recovery tower, third time evaporation is carried out again after increasing temperature and pressure, then through decompression evaporation, obtain pressed oil or sweat oil finally by the evaporation of intensification step-down air lift, this is the evaporation of triple effect five tower.In slack wax, solvent is less slightly, and reclaiming tower quantity can correspondingly reduce) desolvation, the solvent after recovery can containing a small amount of stock oil component.From dewaxed filtrate and slack wax, be separated the solvent obtained, the mixed solvent as butanone, toluene and secondary solvent can recycle, as dewaxing diluting solvent respectively or after mixing, preferably after mixing as dewaxing diluting solvent.
According to the present invention, described stock oil is fluid catalytic cracking decant oil, or the atmosphere 3rd side cut of oil, normal four lines, second line of distillation, subtract three lines, subtract four lines, one or more in the extraction oil of frivolous asphalt oil furfural treatment.
Below in conjunction with accompanying drawing 1, a kind of preferred implementation of the present invention is described.
From secondary solvent and the butanone of pipeline 2, toluene solvant is after pipeline 3 mixes, with the dewaxed feedstock from pipeline 1 after mixing equipment 4 mixes, cooling system 6 is delivered to through pipeline 5, cool to filtration temperature, filter 8 is delivered to through pipeline 7, be separated by filtration as solvent-laden slack wax and dewaxed filtrate, solvent-laden slack wax is delivered to its solvent recovery unit 10 through pipeline 9, gatch after desolvation is through pipeline 11 discharger, dewaxed filtrate is delivered to its solvent recovery unit 13 through pipeline 12, pressed oil after desolvation is through pipeline 14 discharger, the solvent of solvent recovery unit moves towards not shown.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Below will be described the present invention by specific embodiment.
In following embodiment, dewaxing relative filtration velocity refers to, the dewaxing relative filtration velocity first defining comparative example is 100, and the ratio that embodiment relative filtration velocity corresponding to this comparative example is defined as embodiment filtration velocity and comparative example filtration velocity takes advantage of 100.
Dewaxing differential refers to the difference of pressed oil condensation point and dewaxing filtration temperature.
Embodiment 1
The present embodiment prepares the method for pressed oil for illustration of solvent dewaxing provided by the invention.
Raw material is the furfural extract oil of Light lube oil, and its character is in table 1.
Dewaxing solvent is the mixture of butanone, toluene and secondary solvent, in mixture, the cumulative volume content of butanone toluene is 90%, secondary solvent volume content is 10%, in butanone toluene mixture, butanone volume content is 50%, volume of toluene content is 50%, secondary solvent is the mixture of water and ethanol, and wherein volume of water content is 40%, and alcohol volume content is 60%.
Pressed oil is prepared by Fig. 1 flow process, that is: solvent dewaxing adopts multipoint dilution (first to be melted at 70 DEG C by stock oil, then the mode by adding dewaxing diluting solvent for 2 times carries out multipoint dilution in solvent dewaxing process), the mass ratio of dewaxing solvent and dewaxed feedstock is 3.5:1, the stock oil of fusing is mixed with dewaxing diluting solvent, frozen cooling, dewaxing filtration temperature is 5 DEG C, dewaxed filtrate and slack wax is obtained after filtration, obtain pressed oil after dewaxed filtrate desolvation, the pressed oil character obtained is in table 2.Gatch is obtained after slack wax desolvation.
Comparative example 1
Butanone and volume of toluene ratio in identical stock oil, dewaxing process conditions and dewaxing solvent is adopted with embodiment 1, unlike, not containing secondary solvent in dewaxing diluting solvent, the pressed oil character obtained is in table 2.
Embodiment 2
The present embodiment prepares the method for pressed oil for illustration of solvent dewaxing provided by the invention.
Raw material extracts oil out for subtracting three lines, and its character is in table 1.
Dewaxing solvent is the mixture of butanone, toluene and secondary solvent, in mixture, the cumulative volume content of butanone toluene is 95%, secondary solvent volume content is 5%, in butanone toluene mixture, butanone volume content is 80%, volume of toluene content is 20%, secondary solvent is the mixture of water and propyl alcohol, and wherein volume of water content is 10%, and propyl alcohol volume content is 90%.
Pressed oil is prepared by Fig. 1 flow process, that is: first stock oil is melted at 70 DEG C, stock oil mixes with the diluting solvent that dewaxes by the mode then by adding dewaxing diluting solvent for 1 time, the mass ratio of dewaxing diluting solvent and dewaxed feedstock is 4.5:1, is mixed by the stock oil of fusing, frozen cooling with dewaxing diluting solvent, dewaxing filtration temperature is 10 DEG C, obtain dewaxed filtrate and slack wax after filtration, obtain pressed oil after dewaxed filtrate desolvation, the pressed oil character obtained is in table 2.Gatch is obtained after slack wax desolvation.
Comparative example 2
Identical stock oil, dewaxing process conditions is adopted with embodiment 2, and the volume ratio of butanone and toluene in dewaxing solvent, unlike, not containing secondary solvent in dewaxing diluting solvent, pressed oil character is in table 2.
Embodiment 3
The present embodiment prepares the method for pressed oil for illustration of solvent dewaxing provided by the invention.
Raw material extracts oil out for subtracting four lines, and its character is in table 1.
Dewaxing solvent is the mixture of butanone, toluene and secondary solvent, and in mixture, the cumulative volume content of butanone toluene is 93%, and secondary solvent volume content is 7%, and in butanone toluene mixture, butanone volume content is 70%, and volume of toluene content is 30%, and secondary solvent is water.
Pressed oil is prepared by Fig. 1 flow process, that is: solvent dewaxing adopts multipoint dilution (first to be melted at 70 DEG C by stock oil, then the mode by adding dewaxing diluting solvent for 4 times carries out multipoint dilution in solvent dewaxing process), the mass ratio of dewaxing solvent and dewaxed feedstock is 3:1, the stock oil of fusing is mixed with dewaxing diluting solvent, frozen cooling, dewaxing filtration temperature is 0 DEG C, dewaxed filtrate and slack wax is obtained after filtration, obtain pressed oil after dewaxed filtrate desolvation, the pressed oil character obtained is in table 2.Gatch is obtained after slack wax desolvation.
Comparative example 3
Identical stock oil, dewaxing process conditions is adopted with embodiment 3, and the volume ratio of butanone and toluene in dewaxing solvent, unlike, not containing secondary solvent in dewaxing diluting solvent, pressed oil character is in table 2.
Embodiment 4
The present embodiment prepares the method for pressed oil for illustration of solvent dewaxing provided by the invention.
Raw material is fluid catalytic cracking decant oil, and its character is in table 1.
Dewaxing solvent is the mixture of butanone, toluene and secondary solvent, in mixture, the cumulative volume content of butanone toluene is 91%, and secondary solvent volume content is 9%, and in butanone toluene mixture, butanone volume content is 60%, volume of toluene content is 40%, and secondary solvent is ethanol.
Pressed oil is prepared by Fig. 1 flow process, that is: first stock oil is melted at 70 DEG C, stock oil mixes with the diluting solvent that dewaxes by the mode then by adding dewaxing diluting solvent for 1 time, the mass ratio of dewaxing diluting solvent and dewaxed feedstock is 2:1, is mixed by the stock oil of fusing, frozen cooling with dewaxing diluting solvent, dewaxing filtration temperature is-10 DEG C, obtain dewaxed filtrate and slack wax after filtration, obtain pressed oil after dewaxed filtrate desolvation, the pressed oil character obtained is in table 2.Gatch is obtained after slack wax desolvation.
Comparative example 4
Identical stock oil, dewaxing process conditions is adopted with embodiment 4, and the volume ratio of butanone and toluene in dewaxing solvent, unlike, not containing secondary solvent in dewaxing diluting solvent, pressed oil character is in table 2.
Embodiment 5
The present embodiment prepares the method for pressed oil for illustration of solvent dewaxing provided by the invention.
Raw material is the furfural extract oil of Light lube oil, and its character is in table 1.
Dewaxing solvent is the mixture of butanone, toluene and secondary solvent, and in mixture, the cumulative volume content of butanone toluene is 90%, and secondary solvent volume content is 10%, and in butanone toluene mixture, butanone volume content is 50%, and volume of toluene content is 50%, and secondary solvent is water.
Pressed oil is prepared by Fig. 1 flow process, that is: solvent dewaxing adopts multipoint dilution (first to be melted at 70 DEG C by stock oil, then the mode by adding dewaxing diluting solvent for 2 times carries out multipoint dilution in solvent dewaxing process), the mass ratio of dewaxing solvent and dewaxed feedstock is 3.5:1, the stock oil of fusing is mixed with dewaxing diluting solvent, frozen cooling, dewaxing filtration temperature is 5 DEG C, dewaxed filtrate and slack wax is obtained after filtration, obtain pressed oil after dewaxed filtrate desolvation, the pressed oil character obtained is in table 2.Gatch is obtained after slack wax desolvation.
Table 1
Table 2
From relative filtration velocity and the dewaxing differential of embodiment 1-4 in table 2 and comparative example 1-4, with adopt compared with conventional butanone makes dewaxing solvent with the mixed solvent of toluene, present method takes interpolation water and/or secondary solvent made by alcohol, regulate solvent to the dissolving selectivity of condensation point component high in dewaxed feedstock, can effectively improve dewaxing filtration velocity, and reduce dewaxing differential.Therefore, present method takes the method for adding secondary solvent in butanone-toluene Mixed Solvent to regulate dewaxing solvent to the dissolving selectivity of condensation point component high in dewaxed feedstock, and then can effectively improve dewaxing filtration velocity, and reduces dewaxing differential.
In table 2, embodiment 1 proves to adopt the preferred scheme of present method more effectively can remove high condensation point component in stock oil with the contrast of embodiment 5 further, reduces pressed oil condensation point.
Claims (12)
1. the method for a solvent dewaxing, the method comprises under dewaxing conditions, stock oil and the mixture of dewaxing diluting solvent are carried out solvent dewaxing, obtain dewaxed filtrate and slack wax, it is characterized in that, described dewaxing diluting solvent contains the aliphatic ketone of C3-C6, the aromatic hydrocarbon of C6-C8 and secondary solvent, and described secondary solvent is the monohydroxy-alcohol of water and/or C1-C6.
2. method according to claim 1, wherein, described secondary solvent is the mixture of the monohydroxy-alcohol of water and C1-C6, with the cumulative volume of the mixture of the monohydroxy-alcohol of water and C1-C6 for benchmark, the volume content of water is the volume content of the monohydroxy-alcohol of 2% to 50%, C1-C6 is 50% to 98%, preferably, with the cumulative volume of the mixture of the monohydroxy-alcohol of water and C1-C6 for benchmark, the volume content of water is the volume content of the monohydroxy-alcohol of 5% to 40%, C1-C6 is 60% to 95%.
3. method according to claim 1 and 2, wherein, the monohydroxy-alcohol of C1-C6 be selected from methyl alcohol, ethanol, n-propyl alcohol, Virahol, propyl carbinol and isopropylcarbinol one or more, preferably, be selected from ethanol, n-propyl alcohol and Virahol one or more.
4. method according to claim 1 and 2, wherein, with the cumulative volume of the aromatic hydrocarbon of the aliphatic ketone of C3-C6, C6-C8 and secondary solvent for benchmark, the cumulative volume content of the aliphatic ketone of C3-C6 and the aromatic hydrocarbon of C6-C8 is 85-99%, the volume content of secondary solvent is 1-15%, preferably, with the cumulative volume of the aromatic hydrocarbon of the aliphatic ketone of C3-C6, C6-C8 and secondary solvent for benchmark, the cumulative volume content of the aliphatic ketone of C3-C6 and the aromatic hydrocarbon of C6-C8 is 90-95%, and the volume content of secondary solvent is 5-10%.
5. method according to claim 4, with the cumulative volume of the aromatic hydrocarbon of the aliphatic ketone of C3-C6 and C6-C8 for benchmark, the alkenolic volume content of C3-C6 is 45%-90%, the volume content of the aromatic hydrocarbon of C6-C8 is 10%-55%, preferably, with the cumulative volume of the aromatic hydrocarbon of the aliphatic ketone of C3-C6 and C6-C8 for benchmark, the alkenolic volume content of C3-C6 is the volume content of the aromatic hydrocarbon of 50%-80%, C6-C8 is 20%-50%.
6. method according to claim 1 and 2, wherein, the aliphatic ketone of described C3-C6 is acetone and/or butanone, and the aromatic hydrocarbon of described C6-C8 is benzene and/or toluene.
7. method according to claim 1, wherein, the method for described solvent dewaxing is: filtered under dewaxing conditions by the mixture of stock oil with dewaxing diluting solvent, obtain dewaxed filtrate and slack wax.
8. the method according to claim 1 or 7, wherein, the condition of dewaxing comprises: the temperature of solvent dewaxing is-15 DEG C to 20 DEG C, is preferably-10 DEG C to 10 DEG C.
9. the method according to claim 1 or 7, wherein, described dewaxing diluting solvent several times, preferably mixes with stock oil for 2-4 time.
10. the method according to claim 1 or 7, wherein, the mass ratio of described dewaxing diluting solvent and stock oil is 1:1 to 10:1, is preferably 2:1 to 5:1.
11. methods according to claim 1 or 7, wherein, the method also comprises slack wax desolvation, obtains gatch, and/or dewaxed filtrate is removed solvent, is reduced the pressed oil after condensation point.
12. methods according to claim 1 or 7, wherein, described stock oil is selected from fluid catalytic cracking decant oil, and the atmosphere 3rd side cut of crude oil, normal four lines, second line of distillation, subtract three lines, subtract four lines, one or more in the extraction oil of frivolous asphalt oil furfural treatment.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109694747A (en) * | 2017-10-24 | 2019-04-30 | 中国石油化工股份有限公司 | A kind of benzol-kentone dewaxing technique of low waxy feeds |
| CN113684059A (en) * | 2021-07-27 | 2021-11-23 | 上海莱布星科技有限公司 | Method for producing paraffin by adding water, squeezing and dewaxing |
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| CN109694747A (en) * | 2017-10-24 | 2019-04-30 | 中国石油化工股份有限公司 | A kind of benzol-kentone dewaxing technique of low waxy feeds |
| CN113684059A (en) * | 2021-07-27 | 2021-11-23 | 上海莱布星科技有限公司 | Method for producing paraffin by adding water, squeezing and dewaxing |
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