deasphalter bottoms

noun

A mixture of tar and asphalt that is produced as a byproduct of the deasphalting process.

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Meanings

noundeasphalter bottoms pl (plural only)
  1. pluralplural onlyA mixture of tar and asphalt that is produced as a byproduct of the deasphalting process.

    Propane (or sometimes propane/butane mixtures) is extensively used for deasphalting and produces a deasphalted oil (DAO) and deasphalter bottoms (propane deasphalter asphalt, PDA, PD tar) (Dunning and Moore, 1957).

    2015, James G. Speight, Fouling in Refineries, →ISBN, page 210
    1 more example

    The deasphalter unit is usually placed after the vacuum distillation tower, where, by the use of a low-boiling liquid hydrocarbon solvent, such as propane or butane under pressure, the insoluble asphalt-like product (deasphalter bottoms) is .separated from the feedstock.

    2014, R Luque, J Speight, Gasification for Synthetic Fuel Production, →ISBN
Cite this entry
APA

deasphalter bottoms. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/deasphalter%20bottoms

MLA

“deasphalter bottoms.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/deasphalter%20bottoms. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “deasphalter bottoms,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/deasphalter%20bottoms.

Source: deasphalter bottoms on Wiktionary, CC BY-SA 4.0.