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4735703 |
Method of increasing the concentration of straight chain paraffin material
Concentrations of straight chain material are material are increased by treating a thermal-cracked oil distillate boiling in the range of 120° to 290° C. and containing aliphatic olefins, at a...
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4504376 |
Urea dewaxing of naphthene oils
In an improved urea dewaxing process a urea/alcohol slurry chilled to 60° F. to 65° F. is added to a naphthenic distillate chilled to 60° F. to 65° F. to produce a refrigerator oil with...
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4259169 |
Process for the separation of n-paraffins from hydrocarbon oils
A process for the separation of n-paraffins from hydrocarbon by means of solid urea wherein the formation of the adduct of n-paraffins with urea is carried out in a fluidized bed.
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4231960 |
Process for the purification of urea solutions containing biuret and the like
Disclosed is a process and apparatus for purifying and regenerating urea solutions which have been contaminated with biuret and triuret and the like during the use of the urea solutions such as in...
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4070269 |
Urea adduction process for refrigeration oil manufacture
In the process of manufacturing a refrigeration oil where an oil stock is dewaxed by forming a complex with urea in the presence of an activator, the improvement of adding hot vacuum gas oil to the...
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4048055 |
Process for regenerating aqueous urea solutions
The useful process life of aqueous urea solutions used in mineral oil urea dewaxing processes may be significantly prolonged by contacting with an acidic ion exchange resin at least a portion of...
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4042411 |
Method of processing food paraffins and uses of obtained products
Food paraffins are processed into a mixture of paraffins of normal structure, iso-structure, and naphthenes with side chains of normal and iso-structure, containing from 20 to 32 carbon atoms, and...
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4033855 |
Mineral oil dewaxing process with dehydration of feed and solvent
In a mineral dewaxing process, the oil solvent and the wax-containing mineral oil feed are dehydrated by a combination of flash evaporation, steam stripping and azeotropic distillation.
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3954598 |
Purification of aqueous urea solutions in a urea dewaxing process
Dilute aqueous urea solutions, contaminated with oil-solvent solution and obtained as filtrate or centrifugate in a urea dewaxing process of the type where a concentrated aqueous solution of urea...
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3953319 |
Preparation of refrigeration oils
Refrigeration oils are prepared by subjecting a crude lubricating oil fraction to mild hydrogenation, acid treating, dewaxing and clay percolation.
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3945912 |
Urea dewaxing of low n-paraffin content oils
Mineral oils containing small amounts (less than 2 weight percent) of normal paraffins may be urea dewaxed to produce refrigerator oils having Freon cloud or flock points of at least minus 55°C....
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3847791 |
PROCESSS FOR THE PRODUCTION OF NORMAL PARAFFINS BY UREA DEWAXING OF MINERAL OIL DISTILLATES
In a urea dewaxing process, a powdery adduct, capable of being effectively separated by centrifuging, is formed at a temperature range of from about 20° to 40° C. if particular oil solvent...
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3847790 |
TWO STAGE UREA DEWAXING PROCESS
A urea dewaxing process wherein normal paraffins are combined with aqueous urea solution in two, sequential, adduct-forming stages produces high purity normal paraffins. Employing fresh solvent...
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3644201 |
EVAPORATION OF WATER DURING UREA ADDUCT FORMATION
Extractive crystallization separation process in which adduct formation and concentration of an aqueous solution of the adduct-forming agent are simultaneously performed in the same reaction zone.
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3537983 |
SEPARATION PROCESSES INVOLVING INCLUSION COMPOUNDS
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3534116 |
SLURRY ADDUCTION PROCESS
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3502568 |
PROCESS FOR THE SEPARATION OF MIXTURES OF ORGANIC COMPOUNDS BY ADDUCT FORMATION
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3488282 |
CYCLIC ADDUCT-TYPE HYDROCARBON SEPARATION USING VARIABLE TEMPERATURE
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3477945 |
ADDUCT TYPE HYDROCARBON SEPARATION USING COMBINATION REACTOR AND DECOMPOSITION ZONE
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3448040 |
ADDUCT TYPE HYDROCARBON SEPARATION WITHOUT FILTRATION WITH A SULFOLANE SOLVENT
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3444261 |
PROCESS FOR THE PRODUCTION OF OLEFINS SUITABLE FOR CONVERSION TO DETERGENT ALKYLATES
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3433734 |
METHOD FOR THE RECOVERY OF NORMAL PARAFFINS BY UREA ADDUCTION
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3412015 |
Thin film evaporator in an adduction process and apparatus system
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3328313 |
Liquid urea adduction
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3245902 |
Demetallization of high boiling petroleum fractions
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3132084 |
Complex forming dewaxing composition and process
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3108942 |
Dewaxing process
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3078222 |
Preparation of multi-grade lubricating oil by severe hydrogenation and urea adduction
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2935457 |
Production of hard and flexible microcrystalline waxes
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2912426 |
Separation process utilizing urea partition chromatography
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2900322 |
Lubricating oil containing a wax pour point and cloud point suppresser
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2799623 |
Process for separating waxes from oil
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2786015 |
Manufacture of lubricating oils
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2779710 |
Process of upgrading petrolatum
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3756945 |
Title is not available
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3661766 |
Title is not available
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3600297 |
Title is not available
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3759818 |
Title is not available
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3835025 |
Title is not available
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3775295 |
Title is not available
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