[′säl·vənt di‚waks·iŋ] (chemical engineering) A petroleum refinery process for solvent removal of wax from oils; the mixture of waxy oil and solvent is chilled, then filtered or centrifuged to remove the precipitated oil; the solvent is recovered for reuse.

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.

What is solvent refining?

[′säl·vənt ri‚fīn·iŋ] (chemical engineering) The process of treating a mixed material with a solvent that preferentially dissolves and removes certain minor constituents (usually the undesired ones); common in the petroleum refining industry.

What type of solvents are used in the dewaxing process?

The two principal solvents used in solvent dewaxing units are methyl ethyl ketone (MEK) and propane.

What is dewaxing of oil?

Dewaxing is the process of removing wax from base oil feedstocks before further processing into lubricants. Dewaxing is done in two ways: selective hydrocracking to crack the wax molecules, and crystallization through refrigeration and dilution of the oil using a light oil solvent.

Solvent Definition and Example

40 related questions found

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 dewaxing in batik?

The dewaxing method in adire making simply means melting the wax off the fabric. Artisan using wax resist and a stamp to create designs on fabric.

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.

How is solvent refined coal obtained?

Solvent refined coal (SRC), a coal extract which is highly polyaromatic in character and relatively high in N, O and S content, is derived from the direct liquefaction of coal. SRC contains mineral matter in the form of soluble organometallic compounds which can not be removed by filtration.

What is removed in solvent extraction?

Solvent extraction is the act of removing something or separating it. This must be done through force and this process occurs over the course of two different immiscible phases. Immiscible liquids (liquids that do not dissolve in one another) form layers when put together. ... Therefore, water will be the bottom phase.

What is solvent refined base oil?

Solvent-refined oils consist commonly of a mix of different hydrocarbon molecules which cannot be distinguished in the refining process. This results in an oil with irregular molecules causing increased friction within the oil. Group I oils are therefore used most often in less demanding applications.

How is dewaxing of a lubricant oil done by solvent refining?

Refining Processes

The mechanism of solvent dewaxing involves either the separation of wax as a solid that crystallizes from the oil at low temperatures, or the separation of wax as a liquid that is extracted at temperatures above its melting point.

What is propane deasphalting?

Abstract: Propane deasphalting is a process of recovery of hydrocarbon distillates from vacuum residue by extracting with liquid propane. A plated tower is used to carry out extraction where extract containing the deasphalted oil and raffinate containing the asphalt are separated.

What is solvent deasphalting process?

Solvent deasphalting (SDA) is a unique separation process in which the residue is separated by molecular weight (density) instead of by boiling point, producing a low contaminant deasphalted oil (DAO) that is rich in paraffins.

How do you remove wax from sunflower oil?

Sunflower, corn, canola and rapeseed oils contain non-triglyceride compounds that create a haze, or wax, in the oil when chilled or stored for long periods. Chilling, followed by filtration, removes these compounds.

Why is catalytic dewaxing not considered as a separation process?

Dewaxing is considered a separation process, but because Catalytic dewaxing involves breaking and making bonds it is usually referred to as a conversion process of n-paraffins. ... Catalytic dewaxing produces lube base stock with a lower pour point and a in higher yield than that of a product from solvent dewaxing.

What are 6 uses of coal in the everyday world?

Coal also has a myriad of other uses, including in cement production, carbon fibers and foams, medicines, tars, synthetic petroleum-based fuels, and home and commercial heating.

What is oil made of chemically?

Crude oil is a mixture of comparatively volatile liquid hydrocarbons (compounds composed mainly of hydrogen and carbon), though it also contains some nitrogen, sulfur, and oxygen. Those elements form a large variety of complex molecular structures, some of which cannot be readily identified.

What is the maximum temperature of crude oil heated in Adu?

Oil and Gas Industry Network

The temperature of the ADU does not exceed about 900°F (482°C), because above this temperature the hydrocarbons break down to smaller molecules. This breakdown is known as cracking.

What is the aim of cracking?

cracking, in petroleum refining, the process by which heavy hydrocarbon molecules are broken up into lighter molecules by means of heat and usually pressure and sometimes catalysts. Cracking is the most important process for the commercial production of gasoline and diesel fuel.

What is Indonesia batik?

Batik is a technique of wax-resist dyeing applied to the whole cloth, or cloth made using this technique. ... Batik is considered a cultural icon in modern Indonesia, where "National Batik Day" (in Indonesian: Hari Batik Nasional) is celebrated annually on October 2.

What are two main types of batik?

There are two main types of batik in Malaysia today; hand-painted and block printed. These types differ in production techniques, motif and aesthetic expression, and are often classified according to the tool that has been used.

What kind of fabric is used for batik?

Batik Artists mostly use cotton fabrics for their designs. That is why a lot of Batik Designs in the market are found in this Cotton fabric. In the art of Batik, several types of cotton fabrics are used for this purpose. (E.g., 100% Pure cotton, Dyed cotton fabrics, Woven cotton, etc.)

What is Winterisation process?

The winterization process, in simple terms, is the removal of fats, lipids and other unwanted materials from crude oil extract. Winterization is necessary to create a higher purity of cannabinoids. Lipids dilute the cannabinoid fraction, therefore removing them results in a higher quality product.

What is in crude oil?

Crude oil is a naturally occurring fossil fuel - meaning it comes from the remains of dead organisms. Crude oil is made up of a mixture of hydrocarbons - hydrogen and carbon atoms. It exists in liquid form in underground reservoirs in the tiny spaces within sedimentary rocks.