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6890425 |
Solvent extraction refining of petroleum products
A method of refining a petroleum product to remove aromatics and to separate paraffinic oils and waxes is provided. The method involves the utilization of phase equilibria wherein crystallized or...
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6827842 |
On-line determination of wax crystallization temperature of waxy solvent stream
A laser beam reflected by wax crystals is used in determining the wax crystallization temperature of a hot dewaxing solvent upstream of solvent chillers. This is automatically achieved by an...
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6024862 |
Petroleum-wax separation
A process for dewaxing including the steps of mixing a waxy feedstock near its pour point with an ambient or below ambient temperature solvent essentially free of a selected cosolvent, to form a...
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5976353 |
Raffinate hydroconversion process (JHT-9601)
A process for producing a high VI/low volatility lubricating oil basestock. The process comprises subjecting the raffinate from a solvent extraction step to a two step, single stage hydroconversion...
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5647971 |
Method and apparatus for changing solvent composition in a solvent recovery system of a dewaxing apparatus
A method and apparatus for changing the solvent composition in a solvent recovery system of a dewaxing apparatus, depending on the type of stock oil, by introducing a part of dry solvent into a wet...
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5547562 |
Oil dewaxing method
The invention decloses a method for dewaxing a hydrocarbon oil which comprises adding an oil-soluble poly C 18 -C 22 alkylmethacrylate having a molecular weight of from about 10,000 to about...
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5221460 |
Continuous autorefrigerative dewaxing crystallization using a centrifuge
Hydrocarbon dewaxing using propane or other autorefrigerative dewaxing solvent can be practiced in a centrifuge wherein the centrifugal force generated in the centrifuge produces a pressure...
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5196116 |
Process for petroleum - wax separation at or above room temperature
There are disclosed processes for separating waxes of different melting points from a room temperature amorphous or liquid hydrocarbon mixture in an energy conservative manner by selectively...
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5098550 |
Method for dewaxing waxy petroleum products
A method for the solvent dewaxing of wax-containing petroleum products with at least one solvent suitable for dewaxing and a polymeric dewaxing aid comprising polyacrylates, by mixing the products...
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4447311 |
Dewaxing process
A dewaxing process for reducing the pour point of waxy oils in which the oil is cooled by direct contact with a liquid autorefrigerant such as propane. The wax which separates upon cooling is...
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4377467 |
Solvent dewaxing waxy hydrocarbon oils using dewaxing aid
An improved dewaxing aid for solvent dewaxing processes comprising a mixture of (a) lithium isostearate and (b) a polymer of an ester of at least one aliphatic alcohol with methacrylic acid or...
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4332670 |
Catalytic dewaxing of middle distillates
The fractionation and stripping equipment of a middle distillate catalytic dewaxing unit may be eliminated by integrating the catalytic dewaxing unit with a catalytic cracking unit. The light cycle...
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4319962 |
Continuous autorefrigerative dewaxing apparatus
A continuous autorefrigerant solvent dewaxing process is disclosed wherein a waxy oil is prediluted with a non-autorefrigerative solvent, such as ketone, preferably a mixture of MEK/MIBK, and then...
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4217203 |
Continuous autorefrigerative dewaxing process and apparatus
A continuous autorefrigerant solvent dewaxing process is disclosed wherein a waxy oil is prediluted with a non-autorefrigerative solvent, such as ketone, preferably a mixture of MEK/MIBK, and then...
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4216075 |
Combination dewaxing process
A continuous, combination ketone-autorefrigerant solvent dewaxing process is disclosed wherein a waxy oil is partially solvent dewaxed to within from about 30° to 110° F. of the final wax...
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4129583 |
Process for separating crystallizable fractions from mixtures thereof
In a continuous process for separating crystallizable organic components from mixtures thereof in solution, a feedstock of such components is mixed with at least one solvent therefor and the...
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4052294 |
Method of solvent recovery in autorefrigerant/ketone dewaxing processes
Autorefrigerative and ketone solvents are separated and recovered from dewaxed oil and wax through the use of high and low pressure flashes followed by steam stripping. Water buildup in the...
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3720599 |
CONTINUOUS DEWAXING OF OILS BY IN SITU REFRIGERATION
An improved process for dewaxing petroleum oil stocks. Feed oil, with or without a dewaxing solvent, is both mixed and cooled by direct contact with boiling liquid refrigerant, with required...
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3658688 |
TWO-STAGE C DEWAXING/DEOILING PROCESS
An improved process for dewaxing and deoiling a petroleum oil stock with a liquid, normally gaseous solvent in which the oil feed is chilled prior to autorefrigeration by dilution with cold...
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3622496 |
LOW-POUR DEWAXING PROCESS UTILIZING DUAL SOLVENTS
An improved process for dewaxing petroleum oil stocks. A dual solvent consisting of an autorefrigerant and a wax antisolvent is employed to chill the petroleum oil and precipitate out the wax. The...
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3549513 |
SOLVENT DEWAXING PROCESS WITH COOLING BY DIRECT CONTACT WITH EVAPORATING REFRIGERANT
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3506564 |
VISCOSITY CONTROL IN LIQUID-SOLIDS SYSTEMS
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3503870 |
DEWAXING SOLVENT
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3458430 |
SEPARATION OF HYDROCARBON WAX FROM MINERAL OIL USING DEWAXING AIDS
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3322667 |
Hydrocarbon stripping process
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3192125 |
Apparatus for deoiling wax
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3113920 |
Method for dewaxing lubricating oil
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2909475 |
Solvent dewaxing plant with unitary compressor
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2905616 |
Automatic control of chilled solutions
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2903410 |
Solvent dewaxing process wherein a critical amount of inert gas is bubbled through the cooling zone so as to improve subsequent filtration
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2880159 |
Solvent dewaxing of petroleum oil
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2809152 |
Method of deoiling wax while supplying supplemental agitation produced by bubbling vaporized solvent through the wax while cooling
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2786015 |
Manufacture of lubricating oils
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3846277 |
Title is not available
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