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Safe Methoxide-Diluted Batch Removal/Seperation
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Methoxide was added to a batch of biodiesel for reprocessing without first heating the oil. Of course, no heating can occur at this point given that the batch is now diluted with methoxide. At this point, I'm thinking that our only option is to dispose of the batch if we can't somehow separate the methoxide from biodiesel. Does anyone have any suggestions for either safe disposal or separation of the methoxide from the diluted batch?


"It is easier to ship recipes than cakes and biscuits." -Keynes
 
Location: Dickinson College-Carlisle PA | Registered: June 19, 2013Reply With QuoteReport This Post
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Hi Justin,
As long as everything remains liquid in the reactor, the temperature of the reaction is not a limiting factor to the eventual quality of the biodiesel.
In other words, as long as everything is still liquid in the reactor just keep mixing and the reaction will continue, just at a slower rate.

The rule of thumb is that for every 10deg C the temperature is reduced, reaction time doubles.
Assuming everything else is normal and you have an adequate reactor, reaction times would look something like this.

50deg C- 1 hour for the reaction to complete
40deg C- 2 hours
30deg C- 4 hours
20deg C- 8 hours






 
Location: ลึก ประเทศอินเดีย | Registered: March 03, 2001Reply With QuoteReport This Post
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Justin,
I have processed and re-processed many batches to full conversion at between 20 and 30 degs C

The conversion time in practice does not take as long as suggested in the previous post.
 
Location: YORK UK | Registered: April 27, 2014Reply With QuoteReport This Post
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Hi Dgs,

quote:
Originally posted by Dgs:
The conversion time in practice does not take as long as suggested in the previous post.
That is likely to be the case. The times I posted above are for a single stage reaction from start to finish and then they would only be approximates.
When reprocessing, about half the oil remaining to be reprocessed is already partially converted into mono and diglycerides.

Also, if you are using the Warnqvest test to determine the amount of chemicals to use in the reprocess you end up using a large excess of chemicals in the reprocess which will likely accelerate the rate of the reprocess.

In your experience, how long should he mix before doing his first Warnqvest test to check the progress of the reprocess?






 
Location: ลึก ประเทศอินเดีย | Registered: March 03, 2001Reply With QuoteReport This Post
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