CN109694744A - The method of the recovery method and crude lube stock oil dewaxing of crude lube stock oil dewaxing solvent - Google Patents
The method of the recovery method and crude lube stock oil dewaxing of crude lube stock oil dewaxing solvent Download PDFInfo
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- CN109694744A CN109694744A CN201711000233.1A CN201711000233A CN109694744A CN 109694744 A CN109694744 A CN 109694744A CN 201711000233 A CN201711000233 A CN 201711000233A CN 109694744 A CN109694744 A CN 109694744A
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- organic solvent
- oil
- dewaxing
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- filtering film
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G73/00—Recovery or refining of mineral waxes, e.g. montan wax
- C10G73/02—Recovery of petroleum waxes from hydrocarbon oils; Dewaxing of hydrocarbon oils
- C10G73/06—Recovery of petroleum waxes from hydrocarbon oils; Dewaxing of hydrocarbon oils with the use of solvents
- C10G73/08—Organic compounds
- C10G73/22—Mixtures or organic compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
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- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The present invention relates to crude lube stock oil dewaxing field, a kind of method of the recovery method and crude lube stock oil dewaxing of crude lube stock oil dewaxing solvent is disclosed.The recovery method includes contacting the solution containing dewaxing lubricant feedstock oil and organic solvent with composite nanometer filtering film, composite nanometer filtering film includes support membrane and separation membrane layer, the molecular cut off of the composite nanometer filtering film is 400-550Da, the pressure of contact is 2-6MPa, support membrane is polyacrylonitrile, and separation membrane layer is prepared and solidifying the silicone acrylates of modified side chain shown in Formulas I.The average content for the organic solvent in permeate that recovery method of the invention obtains is higher, and the average flux of composite nanometer filtering film is stablized, and is influenced smaller, the production of Yi Shixian continuous-stable by solution temperature in recycling solution system.
Description
Technical field
The present invention relates to the technical fields of crude lube stock oil dewaxing technique, and in particular, to a kind of crude lube stock oil
The method of the recovery method and crude lube stock oil dewaxing of dewaxing solvent.
Background technique
Lubricating oil is that application field is most wide in petroleum chemicals, the product nearest apart from consumer, is to be related to national economy
With national security valuable cargo, " blood " of modern industry of being known as.Simultaneously lubricating oil be a kind of high technology content again, it is efficient
The product of benefit.From the point of view of the analysis of overall oil refining industry, producing lubricating oil, benefit is evident higher than fuel oil.In the production of lubricating oil
Cheng Zhong, due to " wax " of the n-alkane in petroleum distillate containing long-chain, that is, usually said, when temperature reduces these
The lubricating oil component that " wax " will be wrapped in surrounding is precipitated, and forms network structure, influences the mobility of lubricating oil.Therefore dewaxing is
Essential step in Lubrication oil Production Process.
Generally there are two types of methods for lubricating oil dewaxing in industrial production, are solvent dewaxing and Hydrodewaxing respectively.Solvent dewaxing
It is the method applied earliest in OIL IN LUBRICATING OIL PRODUCTION, and now most widely used method.Have one in lubricating oil currently on the market
The method that the half above dewaxing technique uses solvent dewaxing.Solvent dewaxing and the exploitation of hydrogenation combination technique are so that solvent dewaxing
Service life has got back further continuity.
However solvent dewaxing also has the defect of itself, for example a large amount of heat of transformation is needed in solvent recovery to complete solvent
Recycling, not only consumes energy, but also increase the discharge of VOC, brings very big environmental protection pressure.As people are to health and safety
Attention rate increasingly rise, the pressure of the energy brought by a large amount of solvent recovery and environmental protection enters the sight of people, industrially
The new method of energy consumption and environmental pollution can be reduced to solve the problems, such as solvent recovery by needing one kind.
And the method for UF membrane recycling dewaxing solvent is come into being, Mobil Oil Corporation in 1998 builds in Bo Mangte oil plant
At the device of first set membrane separating method recycling ketone-benzol solvent, it is named as MAX-DEWAX.In the Max-Dewax of Mobil Corporation
In lost-wax process, a set of Spiral wound polyimide film is installed in distilling apparatus front, isolates 25%~40% cold solvent,
This method can not only reduce distillation load, while obtained cold soln being recycled to the downstream side of chiller, can also mitigate cold
But load.However in Max-Dewax lost-wax process, the rejection of film used in operating procedure (Matrimid5218) and average
Flux is lower, under conditions of operating pressure is 4.1MPa, only recycles 40% or so solvent, average flux is only 12.9L/
(m2H), rejection 96%；Also, the effect of this method recycling design at normal temperature is poor；In addition, this method operation temperature
Spend it is lower cause must to film carry out periodic cleaning, complex process；In addition, this method it is also required to provide a large amount of height in operation
Quality electric energy, energy consumption is high.
Summary of the invention
The purpose of the invention is to overcome to recycle organic solvent process using ketone-benzol dewaxing device rectifying in the prior art
Present in energy consumption and the higher problem of material consumption and the recovery method and lubricating oil of a kind of crude lube stock oil dewaxing solvent are provided
The method of raw material oil dewaxing.In the permeate that the recovery method of the crude lube stock oil dewaxing solvent provided through the invention obtains
Organic solvent average content it is higher, operation temperature wide coverage, and the removal process of nanofiltration membrane that this method uses
In average flux stablize, by recycling solution system in solution temperature influenced it is smaller, this method for production in temperature fluctuation
Good balance effect；In addition, processing step is simple.
To achieve the goals above, the first aspect of the present invention provides a kind of recycling side of crude lube stock oil dewaxing solvent
Method, this method include contacting the solution containing dewaxing lubricant feedstock oil and organic solvent with composite nanometer filtering film, wherein
The composite nanometer filtering film includes support membrane and separation membrane layer, and the molecular cut off of the composite nanometer filtering film is 400-550Da, contact
Pressure be 2-6MPa, the supporting layer is polyacrylonitrile, and the separation membrane layer is by by the poly- silicon of modified side chain shown in Formulas I
Oxygen alkane acrylate cures and prepare,
In formula (I), a=25-500, b=1-25, c=0-20；
R1For alkyl or aryl independent of each other, identical or different, with 1-30 carbon atom, optionally there is ether
At least one of functional group, ester functional group, epoxy-functional and alcohol functional group；R2It is independent of each other, identical or different
Following group: R1、R3And R4；R3For independent of each other, identical or different organic group, there are one or more acrylic acid
Ester group, R4For identical or different polyether-based.
According to the second aspect of the invention, the present invention also provides a kind of method of crude lube stock oil dewaxing, this method
Include: to mix crude lube stock oil with organic solvent, by gained mixture crystallisation by cooling and filter, obtains containing dewaxing
The filtrate of crude lube stock oil and organic solvent, wherein the method includes recycling to have from the filtrate using the above method
Solvent.
The present invention is by using specific composite nanometer filtering film to the solution containing dewaxing lubricant feedstock oil and organic solvent
It is filtered, so that higher through the average content of organic solvent in the permeate of composite nanometer filtering film.Using the composite nanometer filtering film
The organic solvent of 40%-50% can be recycled；And in entire solvent recovery process, the average flux of composite nanometer filtering film is steady
It is fixed, influenced by solution temperature in recycling solution system smaller, this method is conducive to real temperature fluctuation good balance effect in production
The production of existing continuous-stable.
In addition, recovery method provided by the invention is easy to operate, does not need periodically to clean composite nanometer filtering film, favorably
In industrialized production.
Specific embodiment
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
According to the first aspect of the invention, the present invention provides a kind of recovery method of crude lube stock oil dewaxing solvent, should
Method includes contacting the solution containing dewaxing lubricant feedstock oil and organic solvent with composite nanometer filtering film, wherein described
Composite nanometer filtering film includes support membrane and separation membrane layer, and the molecular cut off of the composite nanometer filtering film is 400-550Da, the pressure of contact
Power is 2-6MPa, and the support membrane is polyacrylonitrile, and the separation membrane layer is by by the polysiloxanes of modified side chain shown in Formulas I
Acrylate cures and prepare,
In formula (I), a=25-500, b=1-25, c=0-20；
R1For alkyl or aryl independent of each other, identical or different, with 1-30 carbon atom, optionally there is ether
At least one of functional group, ester functional group, epoxy-functional and alcohol functional group；R2It is independent of each other, identical or different
Following group: R1、R3And R4；R3For independent of each other, identical or different organic group, there are one or more acrylic acid
Ester group, R4For identical or different polyether-based.
In the present invention, in formula (I), a, b, c, R1、R2、R3And R4Definition and CN102665879A in a, b, c, R1、
R2、R3And R4It defines identical.
According to the method for the present invention, the composite nanometer filtering film that the composite nanometer filtering film can be commercialized, is also possible to by normal
The composite nanometer filtering film prepared with method, as long as composite nanometer filtering film is made to include support membrane and separation membrane layer of the invention.For example, tool
The membrane preparation method of body be referred in CN102665879A film disclosed in specification preparation method (reference can be made to
CN102665879A specification [0090] section)；The Nano filtering composite membrane may be commercially available product, such as extraordinary purchased from wound is won
The trade mark of chemical company is the composite nanometer filtering film of select B or select A.
In the present invention, lubricating oil refers to the product oil being made of base oil and additive.
In the present invention, crude lube stock oil refers to the feedstock oil for being used to prepare lube base oil.
In the present invention, dewaxing lubricant feedstock oil refers to that crude lube stock oil passes through the dewaxing that solvent dewaxing process is formed
Crude lube stock oil.
In the present invention, the molecular cut off of composite nanometer filtering film refers under 25 DEG C and 0.5MPa pressure, in toluene solvant
Dilute solute system under organic matter corresponding when reaching 90% to the rejection of solute molecular weight.
According to the method for the present invention, in order to be conducive to the recycling of organic solvent, so that organic solvent in permeate is averaged
Content is higher, and under preferable case, the average flux of the organic solvent of the nanofiltration membrane is 20-40L/ (m2H), further preferably
For 26-38L/ (m2·h)。
According to the method for the present invention, generally, on the basis of the total amount of the permeate obtained through the composite nanometer filtering film,
The average content of organic solvent in the permeate can be 98 weight % or more.
It should be noted that in the present invention, the flux of the organic solvent of composite nanometer filtering film refer in certain pressure and
At a temperature of, through the volume of the penetrant on per membrane area in the unit time.The average flux of the organic solvent of nanofiltration membrane
Refer to certain pressure and at a temperature of, the solution containing dewaxing lubricant feedstock oil and organic solvent from the solution before infiltration just
The infiltration of composite nanometer filtering film of the beginning concentration into the entire change procedure for the ultimate density for penetrating the solution obtained after composite nanometer filtering film
The average value of saturating object flux.
In the present invention, the content of the organic solvent in permeate obtained through composite nanometer filtering film is to receive through compound
On the basis of the total weight for the permeate that filter membrane obtains, the content of the organic solvent in the permeate.Having in the permeate
The average content of solvent refers to the solution containing dewaxing lubricant feedstock oil and organic solvent from starting through composite nanometer filtering film
Organic solvent of the content of the obtained organic solvent in permeate into the permeate obtained finally through composite nanometer filtering film
The mean concentration of content.
The assembly method of processing method according to the present invention, the composite nanometer filtering film can be made in various conventional modes
With under preferable case, the composite nanometer filtering film is with hollow fiber form membrane module, rolled membrane module, tubular membrane component and plate membrane
The form of component uses, and uses further preferably in the form of wound module and/or board-like component.
According to the method for the present invention, the mode of the composite nanometer filtering film arrangement is can be realized from former containing dewaxing lubricant
It, generally, can be for single group nanofiltration membrane component subject to the purpose for recycling organic solvent in the solution of material oil and organic solvent
Form arranges or with the arranged in parallel of two groups or more composite nanometer filter membrane module.
According to the method for the present invention, in order to enable the average flux stabilization and permeate of the organic solvent of composite nanometer filtering film
In organic solvent average content it is higher so that the recovering effect of organic solvent is more preferable, under preferable case, the pressure of contact is
2.5-5.5MPa further preferably 3-5MPa.
According to the method for the present invention, the temperature that the composite nanometer filtering film is contacted with the solution is can be realized from containing de-
Subject to the purpose for recycling organic solvent in the solution of wax crude lube stock oil and organic solvent, generally, the temperature of the contact
It can be -20 DEG C to 50 DEG C, preferably -15 DEG C to 40 DEG C, further preferably -10 DEG C to 40 DEG C.
It, can also be with method according to the invention it is possible to the solution is contacted at -20 DEG C to 50 DEG C with composite nanometer filtering film
The solution is first within the temperature range of -20 DEG C to 50 DEG C and is contacted again with composite nanometer filtering film, it, will be described molten under preferable case
Liquid is first within the temperature range of -20 DEG C to 50 DEG C and contacts again with composite nanometer filtering film.
According to the method for the present invention, the time solution contacted with composite nanometer filtering film can be according to through composite nanometer filter
The organic solvent content in permeate that film obtains is reasonably selected, and details are not described herein.
According to the method for the present invention, the content of the dewaxing lubricant feedstock oil uses composite nanometer filtering film can be to realize
It is recycled subject to organic solvent in the solution, generally, on the basis of the total amount of the solution, the dewaxing lubricant feedstock oil
Content can be 15-25 weight %, preferably 18-24 weight %.
According to the method for the present invention, the crude lube stock oil is the crude oil fractions for producing lube base oil, excellent
It is selected as the normal four lines fraction that crude distillation obtains, second line of distillation fraction, the line fraction that subtracts three, subtract four line fraction and depitching lubrication oil base
At least one of plinth oil raw material, the line fraction that further preferably subtracts three, the line fraction that subtracts four and depitching lube base oil are former
At least one of material.
According to the method for the present invention, the organic solvent can be can to make the various organic of crude lube stock oil dewaxing
Solvent, generally, the mixture that the monoketone that the organic solvent can be aromatic hydrocarbons and carbon atom number is 3-8 is formed.It is preferred that
Ground, the aromatic hydrocarbons is monoalkyl benzene and/or benzene, in order to enable the recovering effect of lubricating oil dewaxing organic solvent is more preferable, further
Preferably, the monoketone is one of methyl ethyl ketone, acetone, 2- butanone, 2 pentanone, propione and methyl-n-butyl ketone or a variety of；Institute
State the alkyl that alkyl in monoalkyl benzene is C1-C4, the more preferable monoalkyl benzene be one of toluene, ethylbenzene and propyl benzene or
It is a variety of.In most preferred situation, the organic solvent is methyl ethyl ketone and the mixture that toluene is formed.
According to the method for the present invention, the amount ratio of the monoketone and aromatic hydrocarbon can having according to the existing dewaxing used
Solvent ratio is reasonably selected, generally, the weight ratio of the monoketone and aromatic hydrocarbon can for (50:50)-(75:
25), in order to enable the recovering effect of dewaxing organic solvent is more preferable, under preferable case, the weight ratio of the monoketone and aromatic hydrocarbon
For (60:40)-(70:30).
According to the second aspect of the invention, the present invention provides a kind of method of crude lube stock oil dewaxing, this method comprises:
Crude lube stock oil is mixed with organic solvent, by gained mixture crystallisation by cooling and is filtered, obtains lubricating containing dewaxing
The filtrate of oily feedstock oil and organic solvent, wherein the method includes recycling to have from the filtrate using above-mentioned recovery method
Solvent.
According to the method for the present invention, the crude lube stock oil is consistent with above description, and details are not described herein.
According to the method for the present invention, the amount ratio of the dewaxing lubricant feedstock oil and organic solvent is can make lubricating oil
Feedstock oil realizes subject to dewaxing, generally, the weight ratio of the dewaxing lubricant feedstock oil and organic solvent can for (15:
85)-(25:50), in order to enable the recovering effect of organic solvent is more preferable, under preferable case, the crude lube stock oil with it is organic
The weight ratio of solvent is (16:84)-(24:60).
According to the method for the present invention, the organic solvent can be the various organic solvents that can make lubricating oil dewaxing,
The specific choice of the organic solvent is consistent with above description, and details are not described herein.
According to the method for the present invention, by condition that crude lube stock oil is mixed with organic solvent lubrication can be dissolved
Subject to oily feedstock oil, generally, the mixing can carry out at 20-40 DEG C, and the mixed duration can be 1-
120min.In order to obtain better solute effect, under preferable case, the mixing can carry out at 25-40 DEG C, the mixing
Duration can be 30-120min.
According to the method for the present invention, the temperature of the crystallization is can make that paraffin is precipitated in heavy lube stock oil
Standard, generally, the temperature of the crystallization can be -30 DEG C to -10 DEG C, preferably -25 DEG C to -15 DEG C.
According to the method for the present invention, the time of crystallization can reasonably be selected according to crystallization temperature, generally, described
The duration of crystallization can be 1-120min.It is further preferred that the crystallization carries out in the state of with stirring.
The present invention will be described in detail by way of examples below.
(1) crude oil boiling range is 557 DEG C -700 DEG C depitching Lube basic oil material feedstocks, crude oil boiling range are 410 DEG C -580
DEG C the line fraction that subtracts four, crude oil boiling range is 358 DEG C -500 DEG C and subtracts three line fraction is all from Sinopec Maoming Petrochemical branch company；
(2) test of the rejection of nanofiltration membrane film is according to the residue analysis in GB/T498-1987 in regulation oil product
Method carries out.The balance that residue analysis method uses is the high Accuracy Electronic Balance of a ten thousandth gram.According to the nanofiltration membrane of measurement
Rejection calculate
A, the formula of the content of the organic solvent in the permeate obtained through nanofiltration membrane is specific as follows:
B, the measuring method of the average content of the organic solvent in permeate:
(3) flux test method of the organic solvent of nanofiltration membrane are as follows: sample 2min at infiltration end with graduated cylinder, read sample body
Product, multiplied by 30, obtained result is again divided by the area of film.
Average flux (L/ (the m of the organic solvent of nanofiltration membrane2H))=(total volume of permeate) ÷ time of penetration (h)
÷ membrane area (m2)
(4) membrane separation device used in the present invention is UF membrane small testing device.The device includes a high pressure resistant mother liquor
Tank, can be resistant to 69bar pressure, and volume 600mL carries stirring.Two groups of membrane separation assemblies always can tolerate 69bar pressure, film
In separator further include: a kinetic pump, a pressure controlling panel and five pipelines.
Used film is cut into the circle with the general size of gasket in membrane separation assemblies when experiment, is put into membrane separation assemblies
In, combine experimental provision.Filtrate (liquid is connected to graduated glass goat's horn bottle, and two outlets of goat's horn bottle are respectively connected with cream
Sebific duct, wherein one section is closed with haemostatic clamp, the other end is connected with filtrate (liquid, for the pressure in balance goat's horn bottle, goes out with filtrate
There are the gaps of very little can communicate with air for the connected emulsion tube of mouth.
(5) nanofiltration membrane that the present invention uses will pass through the operation for washing film before using.The specific method is as follows: in order to wash away film
The protective layer on surface and allow film adapt to separation system, to carry out washing film before film first time use.Washing solvent used in film is
The mixed solvent of toluene and methyl ethyl ketone, methyl ethyl ketone/toluene mass ratio are 50:50 between 80:20, can be according to specifically used
Mixed solvent proportion is selected, and is sampled 2 minutes every half an hour from the filtrate port small measuring tank of 10mL, until continuous three sub-sampling
Numerical value is identical to be thought to wash film completion.Filtrate is refunded into mother liquor tank as the fluid low 200mL in mother liquor tank.
Embodiment 1
(1) the ketone benzene for the depitching Lube basic oil material feedstocks and 525g for being 557 DEG C -700 DEG C by the crude oil boiling range of 140g
Organic solvent is stirred at 30 DEG C, and gained mixture is cooled at -25 DEG C and crystallizes by mixed duration 0.5h, 1h
After filter, obtain the filtrate containing dewaxing lubricant feedstock oil and ketone benzene organic solvent, the ketone benzene organic solvent used that dewaxes is
The mixture that methyl ethyl ketone and toluene are mixed to form, wherein methyl ethyl ketone/toluene weight ratio is 60:40；
(2) the ketone-benzol solvent 500mL being mixed to form by methyl ethyl ketone and toluene is added into the mother liquor tank of membrane separation device,
The mass ratio of middle methyl ethyl ketone/toluene is 60:40, and by the organic solvent-resistant composite nanometer filtering film sheared, (organic solvent-resistant is compound to be received
Filter membrane is purchased from win wound Specialty Chemical, molecular cut off 550Da, product grade select B, membrane area 0.0014m2) put film into
In separation module, membrane separation device is connected, opens kinetic pump, high pure nitrogen is filled with into mother liquor tank, holding pressure is
30bar washes film.The solvent for washing emptying system after film, be added that step (1) obtain into mother liquor tank contains dewaxing lubricant
The filtrate 500mL of feedstock oil and ketone benzene organic solvent, the dewaxing lubricant raw material on the basis of the total amount of the solution, in the solution
The content of oil is 18 weight %, and methyl ethyl ketone/toluene by weight ratio is 60:40 in solvent, and system pressure keeps 4MPa, alcohol bath control
The temperature of mother liquor tank is 10 DEG C, starts to carry out concentration experiment (UF membrane experiment) after system continuous operation 4h, sampling result is shown in Table
1。
It is can be found that from the experimental result of table 1 and is equivalent to the ketone benzene organic solvent for having recycled 50%, obtained through nanofiltration membrane
To permeate in organic solvent average content up to 99%, the average flux of nanofiltration membrane is 30.7L/ in solvent recovery process
(m2·h)。
Table 1
Embodiment 2
(1) the ketone benzene for the depitching Lube basic oil material feedstocks and 400g for being 557 DEG C -700 DEG C by the crude oil boiling range of 120g
Organic solvent is stirred at 32 DEG C, and gained mixture is cooled at -20 DEG C and crystallizes, after 2h by mixed duration 1h
Filtering, obtains the filtrate containing dewaxing lubricant feedstock oil and ketone benzene organic solvent, and the ketone benzene organic solvent used that dewaxes is first
The mixture that ethyl ketone and toluene are mixed to form, wherein methyl ethyl ketone/toluene weight ratio is 60:40；
(2) concentrate in embodiment 1 is emptied, what into mother liquor tank, addition step (1) was obtained contains dewaxing lubricant
The filtrate 500mL of feedstock oil and ketone benzene organic solvent, the dewaxing lubricant raw material on the basis of the total amount of the solution, in the solution
The content of oil is 20 weight %, and methyl ethyl ketone/toluene by weight ratio is 60:40 in solvent, and system pressure keeps 4.5MPa, water-bath control
The temperature of mother liquor tank is 20 DEG C, starts to carry out concentration experiment (UF membrane experiment) after system continuous operation 4h, sampling result is shown in Table
2.Nanofiltration membrane used in the embodiment is identical as composite nanometer filtering film used in embodiment 1.
It is can be found that from the experimental result of table 2 and is equivalent to the ketone benzene organic solvent for having recycled 45%, obtained through nanofiltration membrane
To permeate in organic solvent average content up to 98.55%, the average flux of nanofiltration membrane is 35L/ in solvent recovery process
(m2·h)。
Table 2
Embodiment 3
(1) the ketone benzene organic solvent for the line fraction that subtracts four and 350g for being 410 DEG C -580 DEG C by the crude oil boiling range of 110g is 35
It is stirred at DEG C, gained mixture is cooled at -15 DEG C and crystallizes, filter after 2h, contained by mixed duration 1h
The filtrate of dewaxing lubricant feedstock oil and ketone benzene organic solvent, the ketone benzene organic solvent used that dewaxes are that methyl ethyl ketone and toluene mix
The mixture of formation, wherein methyl ethyl ketone/toluene weight ratio is 65:35；
(2) the ketone-benzol solvent 500mL being mixed to form by methyl ethyl ketone and toluene is added into the mother liquor tank of membrane separation device,
The mass ratio of middle methyl ethyl ketone/toluene is 65:35, by the organic solvent-resistant nanofiltration membrane sheared (organic solvent-resistant composite nanometer filtering film
Specialty Chemical, molecular cut off 500Da, product grade select A, membrane area 0.0014m are created purchased from winning2) put UF membrane into
In module, membrane separation device is connected, opens kinetic pump, high pure nitrogen is filled with into mother liquor tank, holding pressure is 30bar, is washed
Film.The solvent for washing emptying system after film, be added that step (1) obtain into mother liquor tank containing dewaxing lubricant feedstock oil and
The filtrate 500mL of ketone benzene organic solvent, on the basis of the total amount of the solution, the content of the dewaxing lubricant feedstock oil in the solution
For 21 weight %, methyl ethyl ketone/toluene by weight ratio is 65:35 in solvent, and system pressure keeps 0MPa, and alcohol bath controls mother liquor tank
Temperature is 0 DEG C, starts to carry out concentration experiment (UF membrane experiment) after system continuous operation 4h, sampling result is shown in Table 3.
It is can be found that from the experimental result of table 3 and is equivalent to the ketone benzene organic solvent for having recycled 41%, obtained through nanofiltration membrane
To permeate in organic solvent average content up to 99.1%, the average flux of nanofiltration membrane is 29.9L/ in solvent recovery process
(m2·h)。
Table 3
Embodiment 4
(1) the ketone benzene organic solvent for the line fraction that subtracts four and 350g for being 410 DEG C -580 DEG C by the crude oil boiling range of 110g is 40
It is stirred at DEG C, gained mixture is cooled at -20 DEG C and crystallizes, filter after 1.5h, obtains by mixed duration 0.5h
Filtrate containing dewaxing lubricant feedstock oil and ketone benzene organic solvent, the ketone benzene organic solvent used that dewaxes is methyl ethyl ketone and toluene
The mixture being mixed to form, wherein methyl ethyl ketone/toluene weight ratio is 65:35；
(2) concentrate in embodiment 3 is emptied, what into mother liquor tank, addition step (1) was obtained contains dewaxing lubricant
The filtrate 500mL of feedstock oil and ketone benzene organic solvent, on the basis of the total amount of the solution, dewaxing lubricant feedstock oil in the solution
Content be 22 weight %, methyl ethyl ketone/toluene mass fraction ratio is 65:35 in solvent, and system pressure keeps 3.0MPa, water-bath control
The temperature of mother liquor tank processed is 40 DEG C, starts to carry out concentration experiment (UF membrane experiment) after system continuous operation 4h, sampling result is shown in
Table 4.Nanofiltration membrane used in the embodiment is identical as composite nanometer filtering film used in embodiment 3.
It is can be found that from the experimental result of table 4 and is equivalent to the ketone-benzol solvent for having recycled 55%, obtained through nanofiltration membrane
The average content of organic solvent is up to 98.0% in permeate, and the average flux of nanofiltration membrane is 37.9L/ in solvent recovery process
(m2·h)。
Table 4
Embodiment 5
(1) the ketone benzene organic solvent for the line fraction that subtracts three and 290g for being 358 DEG C -500 DEG C by 100g crude oil boiling range is at 25 DEG C
Under be stirred, gained mixture is cooled at -25 DEG C and crystallizes, filters after 1h by mixed duration 2h, obtains containing de-
The filtrate of wax crude lube stock oil and ketone benzene organic solvent, the ketone benzene organic solvent used that dewaxes are that methyl ethyl ketone and toluene mix shape
At mixture, wherein methyl ethyl ketone/toluene weight ratio be 70:30；
(2) the ketone-benzol solvent 500mL being mixed to form by methyl ethyl ketone and toluene is added into the mother liquor tank of membrane separation device,
The mass ratio of middle methyl ethyl ketone/toluene is 70:30, and by the organic solvent-resistant nanofiltration membrane sheared, (the organic solvent-resistant nanofiltration membrane is root
According to the compound organic solvent-resistant nanofiltration membrane that method disclosed in specification [0090] section in 102665879 A of patent CN is prepared,
Support membrane is polyacrylonitrile, and separation membrane layer is identical as the separation membrane layer in select B film, molecular cut off 400Da, membrane area
For 0.0014m2) put into UF membrane module, membrane separation device is connected, kinetic pump is opened, High Purity Nitrogen is filled with into mother liquor tank
Gas, holding pressure are 30bar, wash film.The solvent for washing emptying system after film is added what step (1) obtained into mother liquor tank
Filtrate 500mL containing dewaxing lubricant feedstock oil and ketone benzene organic solvent, on the basis of the total amount of the solution, in the solution
The content of dewaxing lubricant feedstock oil is 24 weight %, and methyl ethyl ketone/toluene by weight ratio is the holding of 70:30 system pressure in solvent
3.5MPa, the temperature that alcohol bath controls mother liquor tank is -10 DEG C, starts to carry out concentration experiment (UF membrane after system continuous operation 4h
Experiment), sampling result is shown in Table 5.
It is can be found that from the experimental result of table 5 and is equivalent to the ketone-benzol solvent for having recycled 40%, obtained through nanofiltration membrane
The average content of organic solvent is up to 99.15% in permeate, and the average flux of nanofiltration membrane is 26.6L/ in solvent recovery process
(m2·h)。
Table 5
Embodiment 6
(1) the ketone benzene organic solvent for the line fraction that subtracts three and 300g for being 358 DEG C -500 DEG C by the crude oil boiling range of 90g is at 35 DEG C
Under be stirred, gained mixture is cooled at -15 DEG C and crystallizes, filters after 2h by mixed duration 1h, obtains containing de-
The filtrate of wax crude lube stock oil and ketone benzene organic solvent, the ketone benzene organic solvent used that dewaxes are that methyl ethyl ketone and toluene mix shape
At mixture, wherein methyl ethyl ketone/toluene weight ratio be 70:30,
(2) concentrate in embodiment 5 is emptied, what into mother liquor tank, addition step (1) was obtained contains dewaxing lubricant
The filtrate 500mL of feedstock oil and ketone benzene organic solvent, the dewaxing lubricant raw material on the basis of the total amount of the solution, in the solution
The content of oil is 20 weight %, and methyl ethyl ketone/toluene by weight ratio is that 70:30 system pressure keeps 3MPa in solvent, and water-bath control is female
The temperature of flow container is 30 DEG C, starts to carry out concentration experiment (UF membrane experiment) after system continuous operation 4h, sampling result is shown in Table 6.
Nanofiltration membrane used in the embodiment is identical as composite nanometer filtering film used in embodiment 5.
It is can be found that from the experimental result of table 6 and is equivalent to the ketone benzene organic solvent for having recycled 45%, obtained through nanofiltration membrane
To permeate in organic solvent average content up to 98.1%, the average flux of nanofiltration membrane is in solvent recovery process
37.65L/(m2·h)。
Table 6
By result above as can be seen that using recovery method provided by the invention, so that through the saturating of composite nanometer filtering film
The average content for crossing organic solvent in liquid is higher, and the average flux of composite nanometer filtering film is stablized, by solution in recycling solution system
The influence of temperature is smaller, and operating process is stablized, it is easy to accomplish the production of continuous-stable, processing step are simple.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the invention
In art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged to
Protection scope of the present invention.
Claims (10)
1. a kind of recovery method of crude lube stock oil dewaxing solvent, this method includes that will contain dewaxing lubricant feedstock oil and have
The solution of solvent is contacted with composite nanometer filtering film, wherein the composite nanometer filtering film includes support membrane and separation membrane layer, described
The molecular cut off of composite nanometer filtering film is 400-550Da, and the pressure of contact is 2-6MPa, and the support membrane is polyacrylonitrile, institute
Separation membrane layer is stated to prepare and solidifying the silicone acrylates of modified side chain shown in Formulas I,
In formula (I), a=25-500, b=1-25, c=0-20；
R1For alkyl or aryl independent of each other, identical or different, with 1-30 carbon atom, optionally there is ether function
At least one of group, ester functional group, epoxy-functional and alcohol functional group；R2Below independent of each other, identical or different
Group: R1、R3And R4；R3For independent of each other, identical or different organic group, have one or more acrylate-based,
R4For identical or different polyether-based.
2. according to the method described in claim 1, wherein, the average flux of the organic solvent of the composite nanometer filtering film is 20-
40L/(m2H), preferably 26-38L/ (m2·h)；
It is further preferred that on the basis of the total amount of the permeate obtained through the composite nanometer filtering film, in the permeate
The average content of organic solvent is 98 weight % or more.
3. according to the method described in claim 1, wherein, the crude lube stock oil is the original for producing lube base oil
Normal four lines fraction that oil distillate, preferably crude distillation obtain, second line of distillation fraction, the line fraction that subtracts three, subtract four line fraction and de- drip
At least one of green Lube basic oil material feedstocks, the line fraction that further preferably subtracts three, subtract four line fraction and depitching lubrication
At least one of oil base oil raw material.
4. method described in any one of -3 according to claim 1, wherein the organic solvent is aromatic hydrocarbons and carbon atom number
For 3-8 monoketone formed mixture,
Preferably, the aromatic hydrocarbons is monoalkyl benzene and/or benzene, it is highly preferred that the alkane that the alkyl in the monoalkyl benzene is C1-C4
One of base, further preferably toluene, ethylbenzene and propyl benzene are a variety of；
Preferably, the monoketone is one of methyl ethyl ketone, acetone, 2- butanone, 2 pentanone, propione and methyl-n-butyl ketone or more
Kind；
Preferably, the organic solvent is methyl ethyl ketone and the mixture that toluene is formed；
Preferably, the weight ratio of the monoketone and aromatic hydrocarbons is (50:50)-(75:25), more preferably (60:40)-(70:30).
5. according to the method described in claim 1, wherein, the composite nanometer filtering film is with hollow fiber form membrane module, rolled film group
The form of at least one of part, tubular membrane component and plate type membrane component uses,
Preferably, the composite nanometer filtering film is used in the form of wound module and/or board-like component.
6. according to right want 1 described in method, wherein on the basis of the total amount of the solution, the dewaxing lubricant feedstock oil
Content be 15-25 weight %.
7. according to the method described in claim 1, wherein, the temperature of the contact is -20 DEG C to 50 DEG C, and preferably -15 DEG C extremely
40 DEG C, further preferably -10 DEG C to 40 DEG C；
Preferably, the pressure of contact is 2.5-5.5MPa, more preferably 3-5MPa.
8. a kind of method of crude lube stock oil dewaxing, this method comprises: crude lube stock oil is mixed with organic solvent,
It by gained mixture crystallisation by cooling and filters, obtains the filtrate containing dewaxing lubricant feedstock oil and organic solvent, feature exists
In the method includes recycling organic solvent from the filtrate using method described in any one of claim 1-7.
9. according to the method described in claim 8, wherein, the weight ratio of the crude lube stock oil and organic solvent be (15:
85)-(25:50)。
10. according to the method described in claim 8, wherein, described be blended at 20-40 DEG C carries out, the mixing it is lasting when
Between be 1-120min；
Preferably, the temperature of the crystallization is -30 DEG C to -10 DEG C, and the duration of the crystallization is 1-120min.
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| CN112569787A (en) * | 2019-09-27 | 2021-03-30 | 中国石油化工股份有限公司 | Impurity removal method for synthetic rubber crude monomer by using composite nanofiltration membrane |
| CN115491226A (en) * | 2021-06-17 | 2022-12-20 | 中国石油化工股份有限公司 | Method for recovering dewaxing solvent in heavy lubricant base oil filtrate |
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