Why is dewaxing performed?
The main purpose of dewaxing is to remove hydrocarbons that solidify readily (i.e., wax) for making lubricating oil base stock with low pour points (-9 to 14°F).
What is used in dewaxing of lubricating oils?
Removal of the wax from the lubricating base oil is necessary for the base stocks to have the required low temperature properties. The Bechtel Hydrocarbon Technology Solutions (BHTS) solvent dewaxing process uses a mixture of MEK and toluene to aid in the crystallization and filtration of wax from the lube oil stocks.
What is meant by dewaxing and acid refining of crude oil?
ABSTRACT. Degumming, dewaxing and refining are aimed at removing certain fat-soluble impurities. The different operations can be done sepa- rately or in various combinations depending on, e.g., the type of feedstock and the desired refining result.
How do you process refined oil?
Refining the oil Refining consists of heating the oil to between 107 and 188 degrees Fahrenheit (40 and 85 degrees Celsius) and mixing an alkaline substance such as sodium hydroxide or sodium carbonate with it. Soap forms from the undesired fatty acids and the alkaline additive, and it is usually removed by centrifuge.
Why and how the dewaxing of lube oils is done?
Dewaxing of lubricating oil base stocks is necessary to ensure that the oil will have the proper viscosity at lower than ambient temperatures. Two types of process are used; selective hydrocracking and solvent dewaxing. In the formar, one or two zeolite catalysts are used to selectively crack the wax paraffins.
What is solvent dewaxing process?
Solvent dewaxing processes are designed to remove wax from lubricating oils to give the product good fluidity characteristics at low temperatures (e.g., low pour points), rather than being used to treat the whole crude oil (Speight, 2007).
What is solvent dewaxing?
Solvent dewaxing is used to remove wax from either distillate or residual basestock at any stage in the refining process. Other solvents that are sometimes used include benzene, methyl isobutyl ketone, propane, petroleum naphtha, ethylene dichloride, methylene chloride, and sulfur dioxide.
Which chemical is used in refined oil?
Table 1. Basic steps of the refining process
| Alkali or chemical refining | Main groups of compounds removed | Physical Refining |
|---|---|---|
| Degumming | Phospholipids | Degumming |
| Neutralization | Free fatty acids | – |
| Bleaching | Pigments/metals/soaps | Bleaching |
| Winterization | Waxes/saturated triacylglycerols | Winterization |
How is refined oil made in India?
The production process of vegetable oil involves the removal of oil from plant components, typically seeds. This can be done via mechanical extraction using an oil mill or chemical extraction using a solvent. The extracted oil can then be purified and, if required, refined or chemically altered.
Which solvent is used for dewaxing?
In solvent dewaxing the oil feed is diluted with solvent to lower the viscosity, chilled until the wax is crystallized, and then filtered to remove the wax. Solvents used for the process include propane and mixtures of methyl ethyl ketone (MEK) with methyl isobutyl ketone or MEK with toluene.
Which of the following solvent is used for dewaxing?
The two principal solvents used in solvent dewaxing units are methyl ethyl ketone (MEK) and propane.