Difference between revisions of "Glycerol wash"
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| − | Glycerol wash, also known as Glycerol pre-wash, is the process of mixing the waste glycerine from previous reactions before the biodiesel reaction. This has a variety of benefits. | + | Glycerol wash, also known as Glycerol pre-wash, is the process of mixing the waste [[Glycerol |glycerine]] from previous reactions before the biodiesel reaction. This has a variety of benefits. |
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This method is only possible if you have access to glycerol by-product from a previous biodiesel reaction, this is not possible on your first batch. | This method is only possible if you have access to glycerol by-product from a previous biodiesel reaction, this is not possible on your first batch. | ||
| − | The Method below assumes you have a GL eco reactor or similar, although this can be adapted to alternate designs. | + | The Method below assumes you have a [[GL Processor|GL eco reactor]] reactor or similar, although this can be adapted to alternate designs. |
*Fill your reactor with feedstock as normal, although ensure you have enough space for the glycerine to be added. | *Fill your reactor with feedstock as normal, although ensure you have enough space for the glycerine to be added. | ||
| − | *Heat feedstock to ~ | + | *Heat feedstock to ~65°C |
| − | *Inject Glycerine into the reactor using the venturi. Typically the full amount of glycerine from the previous batch is used. | + | *Inject Glycerine into the reactor using the [[venturi]]. Typically the full amount of glycerine from the previous batch is used. |
| − | *Mix for at | + | *Mix for at least 30 minutes, although longer will improve the result. |
*Settle the mixture, turn off all pumps, drain lower pipework if you are using NaOH derived glycerine. | *Settle the mixture, turn off all pumps, drain lower pipework if you are using NaOH derived glycerine. | ||
*Drain off the lower glycerine layer, until oil starts to appear. | *Drain off the lower glycerine layer, until oil starts to appear. | ||
| − | *Mix then take a sample for [ | + | *Mix then take a sample for [[titration]] |
Please note the amount of glycerine drained off can differ to the amount originally loaded into the reactor | Please note the amount of glycerine drained off can differ to the amount originally loaded into the reactor | ||
| − | This can be greater if water has been absorbed into the glycerine, or lower if biodiesel and Methanol have been released into the oil. | + | This can be greater if water has been absorbed into the glycerine, or lower if biodiesel and [[Methanol]] have been released into the oil. |
==Titration== | ==Titration== | ||
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==Toxicology== | ==Toxicology== | ||
| − | If you do not currently de-meth with the glycerine present AKA [ | + | If you do not currently de-meth with the glycerine present AKA [[Whole Batch Demeth]] then Methanol will be present in the waste glycerine and care should be taken to limit exposure to the vapours. Residual [[catalyst]] will be from the last reaction, and so will be highly corrosive so wear protective clothing and eye wear. |
==Safety== | ==Safety== | ||
Revision as of 14:32, 27 March 2011
Glycerol wash, also known as Glycerol pre-wash, is the process of mixing the waste glycerine from previous reactions before the biodiesel reaction. This has a variety of benefits.
Contents
Benefits
- Lowers Titration/Acid value of the oil
- Lowers the water content of the oil
- Frees biodiesel trapped in the glycerol by-product.
- Can Release Methanol from the glycerol layer.
Process
This method is only possible if you have access to glycerol by-product from a previous biodiesel reaction, this is not possible on your first batch.
The Method below assumes you have a GL eco reactor reactor or similar, although this can be adapted to alternate designs.
- Fill your reactor with feedstock as normal, although ensure you have enough space for the glycerine to be added.
- Heat feedstock to ~65°C
- Inject Glycerine into the reactor using the venturi. Typically the full amount of glycerine from the previous batch is used.
- Mix for at least 30 minutes, although longer will improve the result.
- Settle the mixture, turn off all pumps, drain lower pipework if you are using NaOH derived glycerine.
- Drain off the lower glycerine layer, until oil starts to appear.
- Mix then take a sample for titration
Please note the amount of glycerine drained off can differ to the amount originally loaded into the reactor
This can be greater if water has been absorbed into the glycerine, or lower if biodiesel and Methanol have been released into the oil.
Titration
It is very important to titrate after the pre-treat as the main effect it has on is that of reducing the acid value/titration value of the oil, Failure to titrate after may result in excess soap production during the reaction stage.
Toxicology
If you do not currently de-meth with the glycerine present AKA Whole Batch Demeth then Methanol will be present in the waste glycerine and care should be taken to limit exposure to the vapours. Residual catalyst will be from the last reaction, and so will be highly corrosive so wear protective clothing and eye wear.
Safety
Methanol is both highly flammable and toxic, take great care when dealing with this hazardous material. Glycerine will contain residual catalyst from the previous reaction, and so should be treated with care as it is highly corrosive. Ensure you wear long sleeve clothing and wear eye protection.
Mon 19:15, 26 March 2011 (UTC)
