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| Number | Title | Issue Date |
| 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 temperature of 0° to 330° C. in liquid phase in the presen... | 04/05/1988 |
| 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 improved low temperature properties.... | 03/12/1985 |
| 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.... | 03/31/1981 |
| 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 dewaxing processes. The contaminated urea solution is firs... | 11/04/1980 |
| 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 separated urea complex whereby the activator is flashed o... | 01/24/1978 |
| 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 the urea solution recovered from n-paraffin-urea adduct deco... | 09/13/1977 |
| 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 high-melting paraffins of normal structure, by processing ... | 08/16/1977 |
| 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.... | 07/05/1977 |
| 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 is employed to form the wax-urea adduct, are purified by ad... | 05/04/1976 |
| 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.... | 04/27/1976 |
| 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. by utilizing large excesses of the amount of crystalline ur... | 03/23/1976 |
