Biogas Siloxane Removal
From Biogas Treatment
The reactor is built in stainless steal, with retention time, which is considered a huge safety reserve for possible concentration and flow rate peaks. The SILOXANE REACTOR can have one or more chambers, depending on the biogas flow rate. It is vital to have an effective biogas pre-treatment regarding the removal of siloxanes to prevent the premature deterioration of tge equipments.
The name Siloxane is derived from the words: Sil(i...
The name Siloxane is derived from the words: Sil(icon) + Ox(ygen) + (Meth)ane
The polydimethylsiloxanes (PDMS) are polymers presenting units of silica and oxygen repeated n times, with two methyl groups bonded to the silica atom. The value of n may vary between 3 and more than 10,000. The PDMS can be transformed by hydrolysis into smaller-chain compounds, called volatile methyl siloxanes (VMS) and these may have a linear or cyclic structure.
There are thousands of Siloxanes, some examples below:
Cyclic siloxanes
- D3: hexamethylcyclotrisiloxane
- D4: octamethylcyclotetrasiloxane
- D5: decamethylcyclopentasiloxane
- D6: dodecamethylcyclohexasiloxane
Linear siloxanes
- L2: hexamethyldisiloxano
- L3: octamethyltrisiloxano
- L4: decamethyltetrasiloxano
Siloxanes are not decomposed in the activated sludge process, and during the anaerobic digestion volatilise into the biogas. The combustion of these gases produces microcrystalline silica which leads to the abrasion of the surfaces of the engines, due to the hardness of this residue. Volatile compounds of silica generate a fouling layer in engines, turbines, boilers, etc..., contributing to deterioration of motors and equipment malfunctions.
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