CN102234525A - Method for reducing water content in hydrocarbon oil - Google Patents
Method for reducing water content in hydrocarbon oil Download PDFInfo
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- CN102234525A CN102234525A CN2010101655411A CN201010165541A CN102234525A CN 102234525 A CN102234525 A CN 102234525A CN 2010101655411 A CN2010101655411 A CN 2010101655411A CN 201010165541 A CN201010165541 A CN 201010165541A CN 102234525 A CN102234525 A CN 102234525A
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Abstract
The invention discloses a method for reducing water content in hydrocarbon oil, which comprises the following steps of: contacting the hydrocarbon oil with an aqueous solution of salt and performing oil-water separation on a product obtained through contact. In the method, the hydrocarbon oil is contacted with the aqueous solution of salt, and the product obtained through contact is subjected to oil-water separation, so that the aim of reducing the water content in the hydrocarbon oil is successfully fulfilled. The method has the advantages of high efficiency, wide application range, no special requirements on water content and mechanical impurities, simple operation and low cost, and is suitable for dehydrating the hydrocarbon oil of hydrocarbon refining, hydrocarbon cracking, catalytic cracking and atmospheric and vacuum distillation units. By the method, free water can be completely removed and at least partial dissolved water can be effectively removed from the hydrocarbon oil.
Description
Technical field
The present invention relates to a kind of hydrocarbon oil refining process, relate in particular to a kind of method that reduces water-content in the hydrocarbon ils.
Background technology
Petroleum products in process of production, unavoidably to contact water, cause being with in the product water, for example liquid hydrocarbon by the desulfurization of agent alkali after again by the washing, carry out plain sedimentation or pass through the processing of dehydration coalescer, free water content causes micro-alkali lye to bring the gas branch into from unclean sometimes, enter after the fractionation among the C4, influence catalyst for etherification; The boat coal also often carries free-water through after the desulfurization, and the coalescer dewatering is limited, causes the part free-water to enter clay tower, influences the refining life-span of carclazyte; The sodium napthionate that produces during the straight-run diesel oil soda finishing often is brought in the diesel oil with the form of micro emulsion, the washing emulsifying water that causes next step is in diesel oil, divide very difficulty of water by coalescer, and because of the particulate matter of carrying in the higher and diesel oil of diesel oil gum level usually blocked; Hydrogenated diesel oil (hydrofining, hydrocracking) is often carried with water vapour gas in addition, residues in the diesel oil after the portion water steam cooling after gas is carried, and also is difficult to separate; Also there is the free-water that is difficult to remove in the catalytic diesel oil.Moisture is the existence of free-water especially, influence oil product outward appearance and use properties, even cause flame-out of engine, damage engine, increase the corrosion tendency of storage and handling facility, therefore, liquid hydrocarbon, petroleum naphtha, gasoline, kerosene (containing rocket engine fuel), diesel oil, the quality index of lubricated wet goods product all requires not contain free-water or only allows the vestige water-content.
CN101037608A discloses a kind of diesel oil hydrogenation refining fractionation method, this method comprises that a hydrogenation reaction generates oil vapour stripping fractionation process and a refined diesel oil ionization dehydration, wherein ionization dehydration comprise the steps: (1) with the refined diesel oil at the bottom of the separation column by the topping-up pump supercharging, be cooled to 20-50 ℃ through the heat exchange cooling unit then, enter vertical ionization water knockout after the cooling; (2) the high voltage direct current field action by ten thousand volts of the 1.5-2.2 in the vertical ionization water knockout, make the micro-steam condenses in the refined diesel oil be gathered into bigger drops of water fall down to a jar end, and by the dehydration pipeline take off, become the qualified refined diesel oil product of every index after water-free refined diesel oil comes out from the top of ionization water knockout.
CN101397506A discloses a kind of diesel oil dewatering process and device, and this method is carried out the one or many cyclonic separation to the diesel oil that derives from hydrocracking process, is reduced to purification of diesel below the 40mg/kg to obtain water-content in the diesel oil.
Adopting the coalescer dehydration is domestic and international common another kind of dewatering, and this method has for lightweight oil significantly takes off the free-water effect.But for water-content superelevation or density, viscosity is big or contain the diesel oil or the lubricating oil of more mechanical impurity, DeGrain or do not have effect substantially.Even for lightweight oil such as liquid hydrocarbon or boat coal etc., coalescer also can only remove free-water wherein, and effect is limited, and the water that exists for the another kind of form in the hydrocarbon ils, dissolving water, then can not remove substantially, be partly dissolved elutriation when causing the oil temperature to descend and go out to become free-water, influence the hydrocarbon ils outward appearance.
People such as Haitao Liu are at " application of DIESEL ELECTRIC DEHYDRATION AND SALT DEHYDRATION " (petrochemical complex corrosion and protection, 2006,23 (5), 47-49) disclose in the literary composition a kind of with electro-dewatering and dehydration of salt combines or electro-dewatering and dehydration of salt combine with coalescent dehydration diesel oil dewatering technology.This method need adopt electro-dewatering to combine with dehydration of salt, just the diesel oil water-content can be reduced to below the 300mg/kg.
Summary of the invention
The objective of the invention is provides the method for water-content in the reduction hydrocarbon ils that a kind of dehydrating effect is good and energy consumption is low for petroleum products dewatering that overcomes prior art or the shortcoming that dehydrating effect is relatively poor or energy consumption is very high.
The method of water-content in the reduction hydrocarbon ils provided by the invention, wherein, this method comprises hydrocarbon ils is contacted with the aqueous solution of salt, and the product after will contacting carries out oily water separation.
The present inventor finds, adopts the dehydrating effect of the aqueous solution of salt obviously to be better than using the dehydrating effect of the fixed bed that solid salt forms, and reason may be the weak effect that solid salt contacts with hydrocarbon ils, thereby causes demulsification obviously to be worse than the aqueous solution of salt.Be in particular in, when using the saturated solution of salt, can realize that the water-content of hydrocarbon ils is reduced to below the 200mg/kg, when using the combination of specific salts, the present invention not only can remove free-water fully, and can remove effectively and be partly dissolved water at least in the hydrocarbon ils.And when adopting the fixed bed that solid salt forms, even if combine with electro-dewatering technology, also the diesel oil water-content can only be reduced to below the 300mg/kg.Hydrocarbon ils dehydration method of the present invention, the efficient height, suitable wide, there is not particular requirement for water-content, mechanical impurity, simple to operate, cost is low, is applicable to the dehydration from the hydrocarbon ils of hydrofining, hydrocracking, catalytic cracking and atmospheric and vacuum distillation unit.
Embodiment
Among the present invention, the aqueous solution of described salt can be the solution that solute water-soluble salt and water form.Although the solution of various concentration all can be realized purpose of the present invention, the present inventor finds that the concentration of the aqueous solution of salt is high more, and the ability of breaking emulsion and dewatering is also just strong more, so under the preferable case, the concentration of the aqueous solution of described salt is not less than 5 weight %.More preferably concentration be 5 weight % to the salt of solubleness be that the aqueous solution is saturated solution.Be preferably the saturated solution of salt especially, the saturated solution of described salt can be the saturated solution of salt according to the water-soluble acquisition of solubleness proportioning, concentration that also can solute salt is greater than the supersaturated solution of solubleness, can also be the excessive and saturated solution system that separate out with solid form of salt wherein.
As for the condition of contact and the consumption of the aqueous solution of salt, those skilled in the art can specifically determine according to the water-content of the hydrocarbon ils of the water-content of hydrocarbon ils itself and needs acquisition fully.Usually, the water-content of hydrocarbon ils the water-content high more or hydrocarbon ils that needs obtain itself is low more, and the consumption of the aqueous solution of salt is big relatively more, and the time of contact is long relatively more.And because the aqueous solution of hydrocarbon ils and salt and incompatible, the two is easy to realize that profit is separated, and therefore for the water-content that makes hydrocarbon ils reduces as far as possible, preferably makes the aqueous solution of salt excessive as far as possible.
For the water-content that guarantees on the one hand the hydrocarbon ils after the contact lower, do not make the aqueous solution of salt excessive too big on the other hand, thereby save energy, preferably when the water content of described hydrocarbon ils is 250-20000mg/kg, the volume ratio of the aqueous solution of described hydrocarbon ils and described salt is 100: 0.05-50, more preferably 0.5-10.Among the present invention, unless stated otherwise, the water content of hydrocarbon ils is meant the total content of hydrocarbon dissolved water in fuel and free-water.Among the present invention, for the hydrocarbon ils of water-content＞200mg/kg, described water content is meant the water content that adopts GB/T260 " petroleum products aquametry (distillation method) " to measure; For water content is the hydrocarbon ils of 100-200mg/kg, and described water content is meant the water content that adopts SH/T 0246-92 " water-content assay method in the oils (coulometry or karl Fischer method) " or GB/T260 to measure; For water content is hydrocarbon ils less than 100mg/kg, and described water content is meant the water content that adopts SH/T 0246-92 " water-content assay method in the oils (coulometry or karl Fischer method) " to measure.
Among the present invention, described salt is preferably inorganic salt, and further preferred described inorganic salt are one or more in the water-soluble inorganic salt of being made up of one or more positively charged ions in potassium ion, sodium ion, calcium ion, the ammonium ion and one or more negatively charged ion in chlorion, sulfate ion, phosphate anion and the nitrate ion.
Although adopt above-mentioned salt can realize purpose of the present invention, under the preferable case, described inorganic salt are sodium-chlor and ammonium nitrate, and the weight ratio of sodium-chlor and ammonium nitrate is 0.05-10: 1, and 0.1-7 more preferably: 1.The present inventor finds, sodium-chlor by using above-mentioned weight ratio and ammonium nitrate are as described inorganic salt, under the identical situation of the consumption of the aqueous solution of other conditions such as hydrocarbon ils character, duration of contact and salt, the dissolving water-content of described hydrocarbon ils can further reduce.Therefore, the preferred especially described inorganic salt of the present invention are sodium-chlor and ammonium nitrate, and the weight ratio of sodium-chlor and ammonium nitrate is 0.05-10: 1, and 0.1-7 more preferably: 1.
When using sodium-chlor and ammonium nitrate as inorganic salt, although being contacted with the saturated aqueous solution that contains sodium-chlor and ammonium nitrate simultaneously, described hydrocarbon ils can realize above-mentioned purpose, but the present inventor finds, by making described hydrocarbon ils that hydrocarbon ils is contacted with the preferred saturated aqueous solution of the aqueous solution of sodium-chlor, make again with the mixture that obtains after the preferred saturated aqueous solution of the aqueous solution of sodium-chlor contacts and contact with the preferred saturated solution of the aqueous solution of ammonium nitrate, can obtain the effect that free-water removes fully in the hydrocarbon ils, overcome the deficiency that sodium chloride saturated solution only removes most of free-water.Therefore, the mode that the preferred described hydrocarbon ils of the present invention contacts with the aqueous solution of salt is for to make hydrocarbon ils contact with the saturated aqueous solution of sodium-chlor earlier, makes with the mixture that obtains after the saturated solution of sodium-chlor contacts to contact with the saturated aqueous solution of ammonium nitrate again.
Among the present invention, described hydrocarbon ils can carry out in every way with the contacting of the aqueous solution of salt, can under agitation carry out, also can in static mixer, pipeline, carry out, perhaps can also use hybrid modes such as tunica fibrosa mixing to carry out, the present invention preferably carries out in static mixer, thereby the time of described contact is so that hydrocarbon ils and the aqueous solution of salt fully contact in the aqueous solution that free-water in the hydrocarbon ils and dissolving water fully enters salt is as the criterion.The present inventor finds, when surpass 60 minutes the duration of contact of the aqueous solution of hydrocarbon ils and salt, the content of hydrocarbon W/O there is no obvious reduction, thus the time that contacts of the preferred described hydrocarbon ils of the present invention and the aqueous solution of salt be 0.05-60 minute, more preferably 2-10 minute.
For the contacting effect and shorten duration of contact of the aqueous solution that further improves described hydrocarbon ils and salt, the preferred described hydrocarbon ils of the present invention carries out with the contacting in the presence of emulsion splitter of the aqueous solution of salt.With respect to the hydrocarbon ils of 100 weight parts, the consumption of described emulsion splitter can be the 0.001-0.1 weight part, is preferably the 0.0040-0.015 weight part.Described emulsion splitter can be selected from least a in polyether demulsification agent well known in the art, urethane emulsion splitter and other the conventional emulsion splitter.Described emulsion splitter is preferably water-soluble demulsifier, and further preferred described emulsion splitter is one or more in nonyl phenol polyoxyethylene polyoxypropylene ether, Nonyl pheno sodium sulfate, the isooctylphenol urea formaldehyde-polyoxyethylene polyoxypropylene ether etc.Above-mentioned emulsion splitter can be commercially available.
Contacting of the aqueous solution of described hydrocarbon ils and salt can be carried out under each temperature of the condensation point temperature of the aqueous solution that is higher than hydrocarbon ils and salt, but for energy efficient, and contacting under envrionment temperature such as 5-60 ℃ of the aqueous solution of the preferred described hydrocarbon ils of the present invention and salt carried out.
According to the present invention, described hydrocarbon ils can be in the mixture of free carbon hydrogen compound such as the liquid hydrocarbon of straight run or secondary, three processing, gasoline, solvent oil, kerosene, diesel oil, lubricating oil, C3-C35 or hydrocarbon polymer one or more.Described diesel oil can be for from the diesel oil of hydrofining, hydrocracking, catalytic cracking and atmospheric and vacuum distillation unit one or more.
Adopt method provided by the invention not only can thoroughly remove free-water in the hydrocarbon ils, can also be removed to small part dissolving water, even make the hydrocarbon ils product after handling under the low temperature below 10 ℃, also not have free-water to separate out, thereby make hydrocarbon ils outward appearance at a lower temperature still as clear as crystal.
The following examples will the present invention is described further.Although the water content of hydrocarbon ils all is higher than 250mg/kg in following examples, obviously, when the water content of described hydrocarbon ils is lower than 250mg/kg, adopt method of the present invention also can reach the purpose of the water-content of further reduction hydrocarbon ils.In following examples,, adopt GB/T260 " petroleum products aquametry (distillation method) " to measure water content for the hydrocarbon ils sample of water content＞200mg/kg; Be less than or equal to the hydrocarbon ils sample of 200mg/kg for water content, adopt SH/T0246-92 " moisture determination method in the oils (karl Fischer method) " to measure water content.
It is generally acknowledged, the free-water of filter paper in can the effective elimination hydrocarbon ils, but do not influence the dissolving water-content substantially.Therefore, among the present invention in the hydrocarbon ils free water content remove free-water by hydrocarbon ils being adopted the filtering method of qualitative filter paper, treatment capacity is as clear as crystal and filter oil sample bottom, back not have the globule be judgment basis to guarantee to filter back oil sample outward appearance, otherwise changes filter paper; Predictor according to water-content adopts GB/T260 or SH/T 0246 to measure the water-content that filters in the preceding oil sample then, adopts SH/T 0246 to measure the water-content that filters the back oil sample.Water-content before filtering deducts and filters the back water-content is free water content, filters the back water-content and is the dissolving water-content.
Embodiment 1
This embodiment is used for illustrating the method for reduction hydrocarbon ils water-content provided by the invention.
Will (total acid value be 0.008mgKOH/g by the aviation kerosene 2L behind the Merox fixed-bed process mercaptan removal, mercaptan sulfur content 8mg/kg, free water content is 350mg/kg, water content is 480mg/kg) (restrain sodium-chlor with the about 75mL of saturated aqueous sodium chloride that contains ammonium nitrate by 25, the ammonium nitrate of 15 grams and 70 gram deionized water mixed dissolutions obtain, the saturated aqueous sodium chloride that contains ammonium nitrate is 5: 100 with the volume ratio of aviation kerosene) in static mixer after contacting 15 minutes under 40 ℃ in subsider natural subsidence, isolate oil phase wherein, recording free water content is 10mg/kg, water-content is 90mg/kg, finds still for as clear as crystal after being cooled to 10 ℃.
Embodiment 2
This embodiment is used for illustrating the method for reduction hydrocarbon ils water-content provided by the invention.
Will (total acid value be 0.008mgKOH/g by the aviation kerosene 2L behind the Merox fixed-bed process mercaptan removal, mercaptan sulfur content 8mg/kg, free water content is 350mg/kg, water content is 480mg/kg) successively with the about 65mL of saturated aqueous sodium chloride (obtaining with 63 gram deionized water mixed dissolutions) and the about 9mL of ammonium nitrate saturated solution (restraining ammonium nitrate and 8 by 15 restrains the water mixed dissolutions and obtain) by 25 gram sodium-chlor in static mixer after contacting 10 minutes under 40 ℃ in subsider natural subsidence, the total amount of saturated aqueous sodium chloride and ammonium nitrate saturated solution and the volume ratio of aviation kerosene are 3.75: 100, isolate oil phase wherein, recording free water content is 0mg/kg, water-content is 30mg/kg, finds still for as clear as crystal after being cooled to 10 ℃.
Embodiment 3
This embodiment is used for illustrating the method for reduction hydrocarbon ils water-content provided by the invention.
To come from gasoline fraction (abbreviation catalytic gasoline) the process caustic prescrub depriving hydrogen sulphide of catalytic unit and catalytic gasoline 3L (the mercaptan sulfur content 5mg/kg behind the Merox fixed bed mercaptan removal, free water content is 150mg/kg, water content is 320mg/kg, with the about 78mL of the saturated aqueous solution of calcium chloride and ammonium nitrate (by calcium chloride, ammonium nitrate and deionized water obtain with 10: 56: 70 mixed dissolutions of weight ratio, sodium-chlor is 1.6: 100 with the saturated aqueous solution of ammonium nitrate with the volume ratio of catalytic gasoline) in static mixer, under 35 ℃, contact 10 minutes, in subsider, be incubated natural subsidence, isolate oil phase wherein, recording free water content is 10mg/kg, water-content is 60mg/kg, finds still for as clear as crystal after being cooled to 10 ℃.
Embodiment 4
This embodiment is used for illustrating the method for reduction hydrocarbon ils water-content provided by the invention.
To come from diesel oil and Medium diesel oil 1L sample (the free water content 1500mg/kg that obtains after straight-run diesel oil mixes according to volume ratio at 1.8: 1 behind catalytic diesel oil/coking deep hydrofinishing, water content is 1800mg/kg) with the about 75mL of saturated aqueous solution of sodium-chlor and ammonium nitrate (by sodium-chlor, ammonium nitrate and water obtain by weight 10: 45: 47 mixed dissolutions) in 40 ℃ static mixers mix 60 minute at 100: 10 according to volume ratio after in subsider natural subsidence, isolate oil phase wherein, wherein free water content is 5mg/kg, water-content is 55mg/kg, finds still for as clear as crystal after being cooled to 10 ℃.
Embodiment 5
This embodiment is used for illustrating the method for reduction hydrocarbon ils water-content provided by the invention.
Will be from (free water content is 450mg/kg in straight run hydrofining second line of distillation lubricating oil distillate 5L, water-content is 520mg/kg) with the about 78mL of the saturated aqueous sodium chloride that contains ammonium nitrate (obtaining by weight 30: 5: 65 mixed dissolutions with water) by sodium-chlor, ammonium nitrate according to volume ratio 100: 4 in static mixer after mixing 10 minutes under 60 ℃ natural subsidence, isolate oil phase wherein, recording free water content is 15mg/kg, water-content is 33mg/kg, finds still for as clear as crystal after being cooled to 10 ℃.
Embodiment 6
This embodiment is used for illustrating the method for reduction hydrocarbon ils water-content provided by the invention.
According to embodiment 5 described methods the straight run hydrofining second line of distillation lubricating oil distillate of originating identical is carried out processed, different is, the saturated aqueous solution of sodium-chlor and ammonium nitrate is replaced by the sodium chloride saturated solution of equal volume, in static mixer 60 ℃ down mix 10 minutes after natural subsidence, isolate oil phase wherein, recording free water content is 20mg/kg, and water-content is 78mg/kg, finds still for as clear as crystal after being cooled to 10 ℃.
Embodiment 7
This embodiment is used for illustrating the method for reduction hydrocarbon ils water-content provided by the invention.
According to embodiment 6 described methods the straight run hydrofining second line of distillation lubricating oil distillate of originating identical is carried out processed, different is, the concentration that the saturated aqueous solution of sodium-chlor is obtained by same amount sodium-chlor is that the aqueous solution of 20 weight % replaces, in static mixer 60 ℃ down mix 10 minutes after natural subsidence, isolate oil phase wherein, recording free water content is 170mg/kg, and water-content is 225mg/kg, finds still for as clear as crystal after being cooled to 10 ℃.
Comparative Examples 1
Straight run hydrofining second line of distillation lubricating oil distillate 5L that will be identical with embodiment 5 source is that 30 milliliters, sorbent material loadings are that the bottom of the fixed beds (sorbent material is a sodium-chlor) of 35 grams is 2 hours with volume space velocity from volume
-1Send into, oil phase is discharged from the top of fixed bed, and recording free water content is 264mg/kg, and water content is 325mg/kg.
Claims (10)
1. a method that reduces water-content in the hydrocarbon ils is characterized in that, this method comprises hydrocarbon ils is contacted with the aqueous solution of salt, and the product after will contacting carries out oily water separation.
2. method according to claim 1, wherein, the concentration of the aqueous solution of described salt is not less than 5 weight %.
3. method according to claim 2, wherein, the water content of described hydrocarbon ils is 50-20000mg/kg, the volume ratio of the aqueous solution of described hydrocarbon ils and described salt is 100: 0.05-50.
4. according to any described method among the claim 1-3, wherein, described salt is inorganic salt.
5. method according to claim 4, wherein, described inorganic salt are one or more in the water-soluble inorganic salt of being made up of one or more positively charged ions in potassium ion, sodium ion, calcium ion, the ammonium ion and one or more negatively charged ion in chlorion, sulfate ion, phosphate anion and the nitrate ion.
6. method according to claim 5, wherein, described inorganic salt are sodium-chlor and ammonium nitrate, and the weight ratio of sodium-chlor and ammonium nitrate is 0.01-10: 1.
7. method according to claim 6, wherein, the mode that described hydrocarbon ils contacts with the aqueous solution of salt is for to make hydrocarbon ils contact with the aqueous solution of sodium-chlor earlier, makes with the mixture that obtains after the aqueous solution of sodium-chlor contacts to contact with the aqueous solution of ammonium nitrate again.
8. according to claim 1 or 7 described methods, wherein, described contact is carried out in static mixer or in the pipeline, and the time of described contact is 0.05-60 minute.
9. according to claim 1 or 7 described methods, wherein, described hydrocarbon ils is one or more in the liquid light hydrocarbon that obtains of straight run or secondary, three processing, gasoline, solvent oil, kerosene, diesel oil, the lubricating oil.
10. method according to claim 9, wherein, described diesel oil is from the diesel oil of hydrofining, hydrocracking, catalytic cracking and atmospheric and vacuum distillation unit one or more.
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| CN201010165541.1A CN102234525B (en) | 2010-05-07 | 2010-05-07 | Method for reducing water content in hydrocarbon oil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106967459A (en) * | 2017-04-14 | 2017-07-21 | 上海欧勒奋生物科技有限公司 | A kind of method for adding salt method rapidly and efficiently oil-water separation two-phase liquid level by temperature control in PAO15 preparation process |
| CN108865428A (en) * | 2018-07-19 | 2018-11-23 | 河南新县羚锐油茶研究院 | A kind of dewatering in oil and fat refining process |
| CN111208034A (en) * | 2018-11-21 | 2020-05-29 | 中昊晨光化工研究院有限公司 | Method for measuring solubility of paraffin in organic solvent |
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| US6007702A (en) * | 1998-05-22 | 1999-12-28 | Texaco Inc. | Process for removing water from heavy crude oil |
| CN101397506A (en) * | 2008-08-28 | 2009-04-01 | 上海华畅环保设备发展有限公司 | Diesel oil dewatering process and apparatus |
| WO2009070247A1 (en) * | 2007-11-27 | 2009-06-04 | Exxonmobil Research And Engineering Company | Drying fluid hydrocarbons by contacting with an aqueous solution of a salt drying agent prior to passing to a salt dryer |
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| US4551239A (en) * | 1983-04-11 | 1985-11-05 | Exxon Research & Engineering Co. | Water based demulsifier formulation and process for its use in dewatering and desalting crude hydrocarbon oils |
| US6007702A (en) * | 1998-05-22 | 1999-12-28 | Texaco Inc. | Process for removing water from heavy crude oil |
| WO2009070247A1 (en) * | 2007-11-27 | 2009-06-04 | Exxonmobil Research And Engineering Company | Drying fluid hydrocarbons by contacting with an aqueous solution of a salt drying agent prior to passing to a salt dryer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106967459A (en) * | 2017-04-14 | 2017-07-21 | 上海欧勒奋生物科技有限公司 | A kind of method for adding salt method rapidly and efficiently oil-water separation two-phase liquid level by temperature control in PAO15 preparation process |
| CN108865428A (en) * | 2018-07-19 | 2018-11-23 | 河南新县羚锐油茶研究院 | A kind of dewatering in oil and fat refining process |
| CN111208034A (en) * | 2018-11-21 | 2020-05-29 | 中昊晨光化工研究院有限公司 | Method for measuring solubility of paraffin in organic solvent |
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