Absorption of a linear (L2) and a cyclic (D4) siloxane using different oils: application to biogas treatment.

Abstract:

:Hydrophobic volatile methyl siloxanes (VMS), such as hexamethyldisiloxane (L2) and octamethylcyclotetrasiloxane (D4), present a low solubility in water. An alternative treatment by absorption into hydrophobic absorbents was therefore studied. For this purpose, three different absorbents, motor oil, cutting oil and a water-cutting oil mixture, were selected with the aim of re-using a waste product. The set of experiments was carried out in a bubble column, where parameters such as inlet concentration, residence time and temperature were studied. The best performance for the removal of both siloxanes, in terms of absorption capacity, was observed for motor oil, particularly for D4. In fact, motor oil removal efficiency for D 4 was 80%, whereas for L2 it was 60%, indicating that D 4 is more easily absorbed than L2. In the case of water-cutting oil, this showed a mass transfer enhancement from the gas phase to the liquid phase compared with water alone. Furthermore, a removal efficiency of 70% was observed for D 4, showing that the addition of an oil fraction to a water system improves the absorption of VMS. These results show that VMS absorption into oils could be a promising way to achieve their abatement.

journal_name

Environ Technol

journal_title

Environmental technology

authors

Rojas Devia C,Subrenat A

doi

10.1080/09593330.2013.804588

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

3117-27

issue

21-24

eissn

0959-3330

issn

1479-487X

journal_volume

34

pub_type

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