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deasphalter bottoms. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Noun
deasphalter bottoms pl (plural only)
- A mixture of tar and asphalt that is produced as a byproduct of the deasphalting process.
2014, R Luque, J Speight, Gasification for Synthetic Fuel Production, →ISBN: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.
2015, James G. Speight, Fouling in Refineries, →ISBN, page 210: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).