CN105754651A - Solvent dilution and cold washing method for benzol-ketone dewaxing - Google Patents
Solvent dilution and cold washing method for benzol-ketone dewaxing Download PDFInfo
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Abstract
The invention discloses a solvent dilution and cold washing method for benzol-ketone dewaxing and belongs to the technical field of benzol-ketone dewaxing. The method comprises respectively recovering primary recovery tower top distillate solvents, secondary recovery tower top distillate solvents, tertiary recovery tower top distillate solvents and quaternary recovery tower top distillate solvents of dewaxed oil, waxy residue feedstock and deoiled wax. The solvents are respectively used as a first solvent with a butanone mass fraction of 70-80%, a second solvent with a butanone mass fraction of 65-75%, a third solvent with a butanone mass fraction of 55-65% and a forth solvent with a butanone mass fraction of 40-55%. At least two of the first, second, third and forth solvents are used for preparation of a complex solvent with a butanone mass fraction of 50-80%. At different dilution points and cold washing points, the above solvents with different concentrations are used. The corresponding solvents are used at the different dilution points and cold washing points according to appropriate ratios so that a solvent use amount is reduced, energy consumption of benzol-ketone dewaxing is reduced, wax crystal generation and growth are promoted and a filtration rate is improved.
Description
Technical field
The present invention relates to benzol-kentone dewaxing technical field, particularly to a kind of solvent dilution for ketone-benzol dewaxing process and cold wash method.
Background technology
Benzol-kentone dewaxing refer to utilize in petrochemical industry subtract two, subtract three distillate is raw material production dewaxed oil, scale wax and side-product sweat oil, generally comprise freezing, crystallization, filtration and recovery system.The principle of benzol-kentone dewaxing be subtract two, the distillate that subtracts three through cooling, the wax crystallization of high condensation point precipitates out, and along with the decline of temperature, the concentration of raw material oil viscosity and wax crystal increases.In order to reduce the concentration of raw material oil viscosity and wax crystal, wax is made to form good crystalline solid, and reduce material transporting resistance, utilize toluene and butanone or the characteristic of the insoluble wax of butanone dissolved oil, in raw material temperature-fall period, several times, toluene and butanone is added or butanone solvent (hereinafter referred to as ketone-benzene solvent) is diluted such as three times in different dilution point, after the wax crystallization in raw material completes, the solidliquid mixture formed enters dewaxing filter and carries out solid-liquid separation, obtain dewaxing slack wax and dewaxed filtrate, wherein dewaxed filtrate sends to oil recovery system heat temperature raising, solvent is evaporated and reclaims, obtain not solvent-laden dewaxed oil.Owing to dewaxing slack wax oil-containing is higher, need to be added thereto to the benzene-one solvent that temperature is slightly higher, after heating up, obtain solidliquid mixture entrance dewaxing filter carry out solid-liquid separation, removing oil filtrate sends to sweat oil recovery system heat temperature raising, solvent it is evaporated and reclaims, obtaining not solvent-laden sweat oil simultaneously, and removing oil slack wax sends to Wax recovering system heat temperature raising, solvent it is evaporated and reclaims, obtaining not solvent-laden scale wax simultaneously.The solvent that in each process above-mentioned, evaporation recovery obtain mixes, and after cooling, sends crystal system back to as fresh solvent and carries out above-mentioned application again.
Specifically, prior art generally utilizes solvent to be diluted in each dilution point place in crystallization process, carries out cold wash in each cold wash point place in filter process.And common solvents dilution 3 or 4 dilution modes of many employings at present, pre-dilution solvent adds before entering sleeve pipe, first time retarder thinner added before wax precipitation, second time retarder thinner is precipitating out a considerable amount of waxes crystalline substance, and stock solution viscosity adds when increasing to a certain degree, third time retarder thinner completes to add afterwards at wax crystallization.Wherein, the temperature of retarder thinner is preferably shorter than temperature 2-3 DEG C of dilution point and cold wash point, reaches both insoluble wax crystallizations precipitated out, does not produce again chilling, causes the purpose generating more nucleus and small grains.
Inventor have found that prior art at least there is problems in that
Prior art adds identical solvent at different dilution point and cold wash point, and solvent used, without specific aim, causes that solvent load in ketone-benzol dewaxing process is relatively big and energy consumption is higher.
Summary of the invention
Embodiment of the present invention technical problem to be solved is in that, it is provided that the solvent dilution for ketone-benzol dewaxing process of a kind of effective reduction ketone-benzol dewaxing process solvent load and energy consumption and cold wash method.Concrete technical scheme is as follows:
Embodiments provide a kind of solvent dilution for ketone-benzol dewaxing process and cold wash method, including:
Reclaiming the first solvent: be separately recovered the solvent that the tower top of each recovery tower from dewaxed oil, sweat oil and scale wax distillates, as the first solvent after mixing, in described first solvent, the mass fraction of butanone is 70-80%；
Reclaim the second solvent: at the bottom of the tower of described each recovery tower, a residual liquid is after heat exchange, enter each secondary recovery tower of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from described each secondary recovery tower distillates, as the second solvent after mixing, in described second solvent, the mass fraction of butanone is 65-75%；
Reclaim the 3rd solvent: at the bottom of the tower of described each secondary recovery tower, secondary residual liquid is after heat exchange, enter each three recovery towers of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from described each three recovery towers distillates, as the 3rd solvent after mixing, in described 3rd solvent, the mass fraction of butanone is 55-65%；
Reclaim the 4th solvent: at the bottom of the tower of described each three recovery towers, three residual liquids are after heat exchange, enter each four recovery towers of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from described each four recovery towers distillates, as the 4th solvent after mixing, in described 4th solvent, the mass fraction of butanone is 40-55%；
Preparation complex solvent: utilizing at least two preparation complex solvent in described first solvent, described second solvent, described 3rd solvent and described 4th solvent, in described complex solvent, the mass fraction of butanone is 50-80%；
The solvent that mass fraction is 73-80% of butanone is added at two-stage nitration removing oil cold wash point, the solvent that the mass fraction of described butanone is 73-80% is selected from described first solvent, described second solvent or described complex solvent, and the solvent that the mass fraction of described butanone is 73-80% joins dilution point of raw material at described two-stage nitration removing oil cold wash point after cold wash utilizes；
The solvent that mass fraction is 65-72% of butanone is added at one section of removing oil cold wash point, the solvent that the mass fraction of described butanone is 65-72% is selected from described first solvent, described second solvent, described 3rd solvent or described complex solvent, and the solvent that the mass fraction of described butanone is 65-72% joins raw material secondary dilution point at described one section of removing oil cold wash point after cold wash utilizes；
The solvent that mass fraction is 50-62% of butanone is added at dewaxing cold wash point, the solvent that the mass fraction of described butanone is 50-62% is selected from described 3rd solvent, described 4th solvent or described complex solvent, and the solvent that the mass fraction of described butanone is 50-62% joins three dilution point of raw material at described dewaxing cold wash point after cold wash utilizes.
As preferably, in the process reclaiming the first solvent, the solvent that the tower top of a recovery tower of sweat oil is distillated is dried processed.
Specifically, in described complex solvent, the mass fraction of butanone is 50-60%.
Specifically, in described complex solvent, the mass fraction of butanone is 62-72%.
Specifically, in described complex solvent, the mass fraction of butanone is 66-78%.
As preferably, adding the complex solvent that mass fraction is 78% of butanone at described two-stage nitration removing oil cold wash point, described complex solvent joins dilution point of described raw material at described two-stage nitration removing oil cold wash point after cold wash utilizes.
As preferably, adding second solvent that mass fraction is 72% of butanone at described one section of removing oil cold wash point, described second solvent joins described raw material secondary dilution point at described one section of removing oil cold wash point after cold wash utilizes.
As preferably, adding the 3rd solvent that mass fraction is 60% of butanone at described dewaxing cold wash point, described 3rd solvent joins three dilution point of described raw material at described dewaxing cold wash point after cold wash utilizes.
The technical scheme that the embodiment of the present invention provides has the benefit that
The solvent dilution for ketone-benzol dewaxing process of embodiment of the present invention offer and cold wash method, reclaim the solvent with specifically different ketone benzene ratios, and recovered solvent is carried out reasonable preparation, obtain the complex solvent with bigger ketone benzene proportion further, then the actual particular requirement according to crystal system in ketone-benzol dewaxing process and filtration system, solvent formed, the one in the above-mentioned solvent of suitable desired proportion is added targetedly to different dilution point and cold wash point, solvent load can not only be reduced, effectively reduce the energy consumption of ketone-benzol dewaxing process, and by improving the selectivity of solvent, it is more conducive to generation and the growth of wax crystallization, improve the treatment effeciency of benzol-kentone dewaxing.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the solvent dilution for ketone-benzol dewaxing process and the cold wash method flow diagram of the embodiment of the present invention 1 offer.
Detailed description of the invention
For making technical scheme and advantage clearly, below embodiment of the present invention is described further in detail.
Embodiments provide a kind of solvent dilution for ketone-benzol dewaxing process and cold wash method, including:
Reclaiming the first solvent: be separately recovered the solvent that the tower top of each recovery tower from dewaxed oil, sweat oil and scale wax distillates, as the first solvent after mixing, in this first solvent, the mass fraction of butanone is 70-80%；
Reclaim the second solvent: at the bottom of the tower of above-mentioned each recovery tower, a residual liquid is after heat exchange, enter each secondary recovery tower of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from above-mentioned each secondary recovery tower distillates, as the second solvent after mixing, in this second solvent, the mass fraction of butanone is 65-75%；
Reclaim the 3rd solvent: at the bottom of the tower of above-mentioned each secondary recovery tower, secondary residual liquid is after heat exchange, enter each three recovery towers of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from above-mentioned each three recovery towers distillates, as the 3rd solvent after mixing, in the 3rd solvent, the mass fraction of butanone is 55-65%；
Reclaim the 4th solvent: at the bottom of the tower of above-mentioned each three recovery towers, three residual liquids are after heat exchange, enter each four recovery towers of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from above-mentioned each four recovery towers distillates, as the 4th solvent after mixing, in the 4th solvent, the mass fraction of butanone is 40-55%；
Preparation complex solvent: utilizing at least two preparation complex solvent in above-mentioned first solvent, above-mentioned second solvent, above-mentioned 3rd solvent and above-mentioned 4th solvent, in this complex solvent, the mass fraction of butanone is 50-80%；
The solvent that mass fraction is 73-80% of butanone is added at two-stage nitration removing oil cold wash point, the solvent that the mass fraction of this butanone is 73-80% is selected from the first solvent, the second solvent or complex solvent, and the solvent that the mass fraction of this butanone is 73-80% joins dilution point of raw material at two-stage nitration removing oil cold wash point after cold wash utilizes；
The solvent that mass fraction is 65-72% of butanone is added at one section of removing oil cold wash point, the solvent that the mass fraction of this butanone is 65-72% is selected from the first solvent, the second solvent, the 3rd solvent or complex solvent, and the solvent that the mass fraction of this butanone is 65-72% joins raw material secondary dilution point at one section of removing oil cold wash point after cold wash utilizes；
The solvent that mass fraction is 50-62% of butanone is added at dewaxing cold wash point, the solvent that the mass fraction of this butanone is 50-62% is selected from the 3rd solvent, the 4th solvent or complex solvent, and the solvent that the mass fraction of this butanone is 50-62% joins three dilution point of raw material at dewaxing cold wash point after cold wash utilizes.
It is understandable that, " ketone-benzol dewaxing process " described in the embodiment of the present invention, " dewaxed oil, each recovery tower of sweat oil and scale wax ", " dewaxed oil, each secondary recovery tower of sweat oil and scale wax ", " dewaxed oil, each three recovery towers of sweat oil and scale wax ", " dewaxed oil, each four recovery towers of sweat oil and scale wax ", " two-stage nitration removing oil cold wash point ", " one section of removing oil cold wash point ", " dewaxing cold wash point ", " dilution point of raw material ", " raw material secondary dilution point ", " three dilution point of raw material " are state of the art, those skilled in the art can know above-mentioned each recovery tower according to prior art, cold wash point and dilution point also carry out aforesaid operations, and product dewaxed oil can be obtained simultaneously, sweat oil and scale wax, it is not made concrete restriction at this by the embodiment of the present invention.
The solvent dilution for ketone-benzol dewaxing process of embodiment of the present invention offer and cold wash method, reclaim the solvent with different ketone benzene ratio, and recovered solvent is carried out reasonable preparation, obtain the complex solvent with bigger ketone benzene proportion further, then the actual particular requirement according to crystal system in ketone-benzol dewaxing process and filtration system, solvent formed, the one in the above-mentioned solvent of suitable desired proportion is added targetedly to different dilution point and cold wash point, solvent load can not only be reduced, effectively reduce the energy consumption of ketone-benzol dewaxing process, and by improving the selectivity of solvent, it is more conducive to generation and the growth of wax crystallization, improve the treatment effeciency of benzol-kentone dewaxing.
As preferably, owing to recycling design of sweat oil contains the water of about 1%, directly utilize dilution and cold wash weak effect, and the water capacity easily freezes on filter, reduce the rate of filtration of filter, therefore, in the process reclaiming the first solvent, the solvent that the tower top of a recovery tower of sweat oil is distillated is dried processed.That is, it is dried processed before mixing by the solvent distillated at the tower top of the solvent distillated by the tower top of a recovery tower of the sweat oil reclaimed with dewaxed oil and each recovery tower of scale wax.
In the embodiment of the present invention, utilize at least two preparation complex solvent in above-mentioned first solvent, above-mentioned second solvent, above-mentioned 3rd solvent and above-mentioned 4th solvent, the complex solvent that mass fraction is 50-80% of preparation butanone.
It is understood that this complex solvent can be made up of any two kinds in the first solvent, the second solvent, the 3rd solvent and the 4th solvent, any three kinds or any four.
For example, in this complex solvent, the mass fraction of butanone can be 50-60%, 62-72% or 66-78%, it is also possible to is 51%, 57%, 61%, 67%, 71%, 75%, 79% etc..
As preferably, in order to reduce the loss of wax while remaining fluid in elimination wax, adding the complex solvent being made up of the first solvent and the second solvent that mass fraction is 78% of butanone at two-stage nitration removing oil cold wash point.In order to reduce the yield of sweat oil, add second solvent that mass fraction is 72% of butanone at one section of removing oil cold wash point and dilution point.For the oil in abundant dissolving wax, add the 3rd solvent that mass fraction is 60% of butanone at dewaxing cold wash point.
At present, the solvent dilution method adopted in ketone-benzol dewaxing process mostly is 3 dilutions or 4 dilutions, for example, common 3 dilution flow processs are as follows: a solvent dilution: removing oil two-stage nitration cold wash vacuum filtrate (including part fine vacuum filtrate and recycling design) is from removing oil two-stage nitration filtrate tank, after being extracted out by solvent pump, by the retarder thinner line that dewaxes, respectively through one time, each road solvent flow control valve, it is applied directly to heat exchange sleeve raw material tube side middle and lower part, each road, once dilutes fresh solvent as dewaxing.Secondary solvent dilutes: one section of cold wash vacuum filtrate of removing oil (including part fine vacuum filtrate and recycling design) is from one section of filtrate tank of removing oil, after being extracted out by one section of recycle liquid pump, after a solvent heat exchanger and secondary solvent heat exchanger and dewaxed filtrate Continuous Heat Transfer, then respectively through each road secondary solvent flow control valve, it is added in the heat exchange sleeve material outlet line of each road, as dewaxing secondary dilution fresh solvent.Three solvent dilutions: dewaxing cold wash vacuum filtrate (including part fine vacuum filtrate and recycling design) is from dewaxed filtrate tank, after being extracted out by dewaxed filtrate circulating pump, first pass through three solvent flow control valve, cool then through the ammonia effective ammonia of cold set, then the cold cannula exit bus of secondary amine is gone, as three dilution fresh solvents of dewaxing.Dewaxing cold wash solvent, removing oil cold wash solvent are recovery system recovered solvent, use after cooling.
In order in solvent dilution process, the selectivity of solvent for use is improved targetedly in different dilution point, and then improve the yield of wax crystallization, reduce the productivity of sweat oil, and reduce the generation of energy consumption, as preferably, the embodiment of the present invention is added in the complex solvent that mass fraction is 78% of two-stage nitration removing oil cold wash point butanone after cold wash utilizes in dilution point of raw material.Further, it is added in one section of removing oil cold wash point, second solvent that mass fraction is 72% of butanone after cold wash utilizes at raw material secondary dilution point.Further, the 3rd solvent that mass fraction is 60% of dewaxing cold wash point butanone after cold wash utilizes it is added in three dilution point of raw material.
Wherein, above-mentioned " after cold wash utilizes " refers to solvent for use and had been carried out cold wash utilization before being diluted utilizing, and is also about to the solvent after cold wash utilizes and is used as retarder thinner further, to improve its utilization rate, reduces energy consumption.
Visible, the method provided according to embodiments of the present invention, utilize in the process that solvent is diluted in above three raw material dilution point, from dilution point of raw material to three dilution point of raw material, toluene level in retarder thinner used gradually rises, it is more conducive to generation and the growth of wax crystallization, reduces wax dissolubility in solvent and oil, and be more conducive to reduce the condensation point of dewaxed oil.
Hereinafter will be further described through the present invention by specific embodiment.
Unreceipted condition person in specific examples below, all conventionally condition carries out.The unreceipted production firm of raw materials used and device and specification person be can pass through city available from conventional products.
Embodiment 1
The present embodiment utilizes conventional ketone-benzol dewaxing device to process certain second line of distillation oil, in the ketone-benzol dewaxing process of this second line of distillation oil, make use of solvent dilution and cold wash method that the embodiment of the present invention provides.Accompanying drawing 1 for the present embodiment provide for the solvent dilution of ketone-benzol dewaxing process and cold wash method flow diagram, wherein, the raw material dilution point of three grades of crystallisation by cooling parts from left to right respectively dilution point of raw material, raw material secondary dilution point, three dilution point of raw material；Each recovery tower of dewaxed oil, sweat oil and scale wax refers to the recovery tower simultaneously including a recovery tower of dewaxed oil, a recovery tower of sweat oil and scale wax；Correspondingly, each four recovery towers of each three recovery towers of each secondary recovery tower of dewaxed oil, sweat oil and scale wax, dewaxed oil, sweat oil and scale wax, dewaxed oil, sweat oil and scale wax are respectively provided with the implication similar to each recovery tower of above-mentioned dewaxed oil, sweat oil and scale wax.
As shown in Figure 1, specifically comprising the following steps that of the method that the present embodiment provides
Being separately recovered the solvent that the tower top of each recovery tower from dewaxed oil, sweat oil and scale wax distillates, as the first solvent after mixing, in this first solvent, the mass fraction of butanone is 80%.Wherein, before above-mentioned each solvent is mixed into the first solvent, to from the recovered overhead of sweat oil recovery tower to solvent be dried processed.
At the bottom of the tower of an above-mentioned recovery tower, a residual liquid is after heat exchange, enter each secondary recovery tower of dewaxed oil, sweat oil and scale wax, being separately recovered the solvent that the tower top from above-mentioned secondary recovery tower distillates, as the second solvent after mixing, in this second solvent, the mass fraction of butanone is 72%.
At the bottom of the tower of above-mentioned secondary recovery tower, secondary residual liquid is after heat exchange, enter each three recovery towers of dewaxed oil, sweat oil and scale wax, being separately recovered the solvent that the tower top from above-mentioned each three recovery towers distillates, as the 3rd solvent after mixing, in the 3rd solvent, the mass fraction of butanone is 60%.
At the bottom of the tower of each three recovery towers of above-mentioned dewaxed oil, sweat oil and scale wax, three residual liquids are after heat exchange, enter each four recovery towers of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from above-mentioned four recovery towers distillates, as the 4th solvent after mixing, in the 4th solvent, the mass fraction of butanone is 42%.
At two-stage nitration removing oil filtration fraction, it it is 78% added two-stage nitration removing oil cold wash point by the complex solvent of the first solvent and the 4th solvent complex and carry out cold wash utilization by the mass fraction of butanone.Then at the scale wax liquid of two-stage nitration removing oil filtration fraction acquisition, four recovery towers of the recovery tower to scale wax that sequentially enter scale wax are carried out the recovery of scale wax, and raw oil is once diluted by the dilution point of raw material that will go in the raw material dilution point of three grades of crystallisation by cooling parts through the complex solvent by the first solvent and the 4th solvent complex that mass fraction is 78% of the above-mentioned butanone of cold wash utilization.
At one section of removing oil filtration fraction, the second solvent that the mass fraction of butanone is 72% is added one section of removing oil cold wash point and carries out cold wash utilization.Then, one section of removing oil filtration fraction entrance two-stage nitration removing oil filtration fraction is carried out deoiling treatment again by the first scale wax liquid obtained；Four recovery towers of the recovery tower to sweat oil that sequentially enter sweat oil are carried out the recovery of sweat oil by the sweat oil liquid obtained by one section of removing oil filtration fraction；And raw oil is carried out secondary dilution by the raw material secondary dilution point that second solvent that mass fraction is 72% of the above-mentioned butanone after cold wash utilizes will go in the raw material dilution point of three grades of crystallisation by cooling parts.
At dewaxing filtration fraction, the 3rd solvent that the mass fraction of butanone is 60% is added dewaxing cold wash point and carries out cold wash utilization.Then, dewaxing filtration fraction the non-scale wax liquid obtained carries out one section of deoiling treatment by entering one section of removing oil filtration fraction；Four recovery towers of the recovery tower to dewaxed oil that sequentially enter dewaxed oil are carried out dewaxing oil recovery by the dewaxing fluid obtained by dewaxing filtration fraction；And the 3rd solvent that mass fraction is 60% of the above-mentioned butanone after cold wash utilizes will go into three dilution point of raw material in the raw material dilution point of three grades of crystallisation by cooling parts and raw oil carry out three dilutions.
The recovery of dewaxed oil, sweat oil and scale wax sequentially will be carried out respectively through each four recovery towers of each recovery tower of dewaxing filtration fraction, one section of removing oil filtration fraction, two-stage nitration removing oil filtration fraction and dewaxed oil, sweat oil and scale wax to dewaxed oil, sweat oil and scale wax at three grades of crystallisation by cooling parts dilution raw oil after above-mentioned three dilutions.The present embodiment by utilizing composition different retarder thinner and cold wash solvent targetedly to different dilution point with cold wash point, give full play to the specific aim effect of solvent, it is beneficial to the growth of wax crystallization, wax yield improves 2%, and solvent can be reduced make consumption 5%, corresponding reduce the energy consumption about 4% that removal process consumes.Additionally, due to the solvent that the tower top of recovery tower of sweat oil is distillated has carried out drying and dehydrating process, it is therefore prevented that water freezes on filter, improves the filter rate of filtration.
Embodiment 2
The present embodiment is essentially identical with embodiment 1 operating procedure, is distinctive in that, the present embodiment mass fraction of butanone in the solvent that two-stage nitration removing oil cold wash point and dilution point of follow-up raw material are affiliated is 76%；In the solvent that one section of removing oil cold wash point and follow-up raw material secondary dilution point are affiliated, the mass fraction of butanone is 69%；In the solvent that dewaxing cold wash point and three dilution point of follow-up raw material are affiliated, the mass fraction of butanone is 57%.
By the present embodiment, retarder thinner, cold wash solvent that each dilution point and cold wash are pointed out are different on composition, give full play to the specific aim effect of solvent, it is beneficial to the growth of wax crystallization, wax yield improves 2%, and reduction solvent makes consumption 6%, the energy consumption about 5% that corresponding minimizing removal process consumes.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the scope of the invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (8)
1. for the solvent dilution of ketone-benzol dewaxing process and a cold wash method, including:
Reclaiming the first solvent: be separately recovered the solvent that the tower top of each recovery tower from dewaxed oil, sweat oil and scale wax distillates, as the first solvent after mixing, in described first solvent, the mass fraction of butanone is 70-80%；
Reclaim the second solvent: at the bottom of the tower of described each recovery tower, a residual liquid is after heat exchange, enter each secondary recovery tower of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from described each secondary recovery tower distillates, as the second solvent after mixing, in described second solvent, the mass fraction of butanone is 65-75%；
Reclaim the 3rd solvent: at the bottom of the tower of described each secondary recovery tower, secondary residual liquid is after heat exchange, enter each three recovery towers of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from described each three recovery towers distillates, as the 3rd solvent after mixing, in described 3rd solvent, the mass fraction of butanone is 55-65%；
Reclaim the 4th solvent: at the bottom of the tower of described each three recovery towers, three residual liquids are after heat exchange, enter each four recovery towers of dewaxed oil, sweat oil and scale wax, it is separately recovered the solvent that the tower top from described each four recovery towers distillates, as the 4th solvent after mixing, in described 4th solvent, the mass fraction of butanone is 40-55%；
Preparation complex solvent: utilizing at least two preparation complex solvent in described first solvent, described second solvent, described 3rd solvent and described 4th solvent, in described complex solvent, the mass fraction of butanone is 50-80%；
The solvent that mass fraction is 73-80% of butanone is added at two-stage nitration removing oil cold wash point, the solvent that the mass fraction of described butanone is 73-80% is selected from described first solvent, described second solvent or described complex solvent, and the solvent that the mass fraction of described butanone is 73-80% joins dilution point of raw material at described two-stage nitration removing oil cold wash point after cold wash utilizes；
The solvent that mass fraction is 65-72% of butanone is added at one section of removing oil cold wash point, the solvent that the mass fraction of described butanone is 65-72% is selected from described first solvent, described second solvent, described 3rd solvent or described complex solvent, and the solvent that the mass fraction of described butanone is 65-72% joins raw material secondary dilution point at described one section of removing oil cold wash point after cold wash utilizes；
The solvent that mass fraction is 50-62% of butanone is added at dewaxing cold wash point, the solvent that the mass fraction of described butanone is 50-62% is selected from described 3rd solvent, described 4th solvent or described complex solvent, and the solvent that the mass fraction of described butanone is 50-62% joins three dilution point of raw material at described dewaxing cold wash point after cold wash utilizes.
2. method according to claim 1, it is characterised in that in the process reclaiming described first solvent, the solvent that the tower top of a recovery tower of sweat oil is distillated is dried processed.
3. method according to claim 1, it is characterised in that in described complex solvent, the mass fraction of butanone is 50-60%.
4. method according to claim 1, it is characterised in that in described complex solvent, the mass fraction of butanone is 62-72%.
5. method according to claim 1, it is characterised in that in described complex solvent, the mass fraction of butanone is 66-78%.
6. method according to claim 2, it is characterized in that, add the described complex solvent that mass fraction is 78% of butanone at described two-stage nitration removing oil cold wash point, described complex solvent joins dilution point of described raw material at described two-stage nitration removing oil cold wash point after cold wash utilizes.
7. method according to claim 6, it is characterized in that, add described second solvent that mass fraction is 72% of butanone at described one section of removing oil cold wash point, described second solvent joins described raw material secondary dilution point at described one section of removing oil cold wash point after cold wash utilizes.
8. method according to claim 7, it is characterised in that add described 3rd solvent that mass fraction is 60% of butanone at described dewaxing cold wash point, described 3rd solvent joins three dilution point of described raw material at described dewaxing cold wash point after cold wash utilizes.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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