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The process of removing asphalt from petroleum fractions.



Related Terms

DEHYDROCYCLIZATION

Any process involving both dehydrogenation and cyclization, as in petroleum refining.

OXIDATION

Occurs when oxygen attacks petroleum fluids. The process is accelerated by heat, light, metal catalysts and the presence of water, acids, or solid contaminants. It leads to increased viscosity and deposit formation.

COKING

  1. Destructive distillation of coal to make coke
  2. A process for thermally converting the heavy residual bottoms of crude oil entirely to lower-boiling petroleum products and by-product petroleum coke.

ACID TREATMENT

A refining process in which unfinished petroleum products, such as gasoline, kerosine, and diesel oil, are contacted with sulfuric acid to improve their color, odor, and other properties.

ISOFORMING

A petroleum refinery process in which olefinic naphtha is contacted with an alumina catalyst at high temperature and low pressure to produce isomers of higher octane number.

FLEMING CRACKING PROCESS

An obsolete liquid-phase thermal cracking process for heavy petroleum fractions; the charge was heated under pressure in a vertical shell still.

DELAYED COKING

A semicontinuous thermal process for converting heavy petroleum stock to lighter material.

CONTACT ADSORPTION

Process for removal of minor constituents from fluids by stirring in direct contact with powdered or granulated adsorbents, or by passing the fluid through fixed-position adsorbent beds (activated carbon or ion-exchange resin); used to decolorize petroleum lubricating oils and to remove solvent vapors from air.

BLOWING STILL

A still or process column in which blown or oxidized asphalt is made.

HYDRODESULFURIZATION

A catalytic process in which the petroleum feedstock is reacted with hydrogen to reduce the sulfur content in the oil.

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