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World Famous Dr Pepper Technique (Pat Pend)

This topic can be found at:
http://biodiesel.infopop.cc/eve/forums/a/tpc/f/719605551/m/857600061

November 03, 2008, 07:08 AM
Bunk
World Famous Dr Pepper Technique (Pat Pend)
Heat the bottle back up by floating it in a bucket of hot water. I had some test batches turn out just like yours and that usually fixes it.

Ken
December 05, 2008, 11:51 PM
Chrismyth
Here is what I have after many attempts. I tried both my WVO and some virgin Canola. Oddly, my WVO looks a bit better compared to where it started! After 2 days of settling and proper washing, it still looks like apple cider. I even heated it to make sure the water was gone - and when I do it goes clear....but then looks like this again in a day after sitting room temp.
HOWEVER, pass 3/27 with flying colors! How can this be if it looks this bad? (not clear) The examples and pictures of the "experts" brew always look clear and shiny. I have yet to produce any that looks like that no matter how carefully I follow directions. (I've been doing this for a week now - probably a dozen batches)



This is how they looked immediately after washing:

December 07, 2008, 02:17 PM
irishtkd
THis is a sample of mine, but it took 8 hours to look like this and it doesn't look like the explanation you have given. I measured out 250ml of HEET with a plastic measuring cup. I used a cleaned spaghetti sauce jar and it seemed like the seal was melting or at least not working when I was "sloshing" arund the methanol and lye.

I mixed the methanol and lye and Canola veggie oil outside so that I had proper ventilation, But I set the 1 liter bottle inside after I mix and shook becuase it is about 40degrees outside.

The only thing I didnt measure absolutely correct was the lye...I used half a tablespoon of lye instead of a teaspoon.

Attached is the pic of my final product after 12 hours sitting....

Any advice would be helpful or does my experiment look correct?

final product

January 10, 2009, 04:08 AM
elmejor
i have definitely heard about this Dr.Pepper technique...but have never used it personally coz of the danger of chemicals involved in it
January 10, 2009, 06:20 AM
Bunk
quote:
Originally posted by Chrismyth:
How can this be if it looks this bad? (not clear) The examples and pictures of the "experts" brew always look clear and shiny. I have yet to produce any that looks like that no matter how carefully I follow directions. (I've been doing this for a week now - probably a dozen batches)
It probably still has too much water in it. It should clear up when dried thoroughly. I'd try putting it into a large shallow pan and then blow a fan across the surface for a few hours.

Ken
January 10, 2009, 06:22 AM
Bunk
quote:
Originally posted by irishtkd:
The only thing I didnt measure absolutely correct was the lye...I used half a tablespoon of lye instead of a teaspoon.

Tilly's directions call for half a teaspoon of "lye". Three teaspoons = one tablespoon. You used about a teaspoon too much "lye".
quote:

Any advice would be helpful or does my experiment look correct?

Biodiesel quality is difficult to judge by appearance. If the reaction goes well it will appear good. If the reaction is marginal it can still look good.

New vegetable oil usually yields a very clean looking byproduct layer. It's sometimes hard to see the difference between the biodiesel layer and byproduct layer. Used vegetable oil gives a very dark byproduct layer. Biodiesel doesn't always look like liquid gold over a layer of tar.

It's hard to tell in your photo but it looks like your batch had a reaction and separation. It might be correct but you used three times the recommended amount of "lye". If your "lye" is NaOH it can turn the biodiesel to gel. If your "lye" is KOH it probably won't turn to gel but it will be very soapy.

Ken
January 10, 2009, 06:34 AM
Bunk
quote:
Originally posted by elmejor:
i have definitely heard about this Dr.Pepper technique...but have never used it personally coz of the danger of chemicals involved in it


True, the chemicals can be harmful if handled improperly. Safety precautions are included in the directions for the Dr Pepper technique. If the safety procedures are followed and the chemicals are handled with respect and common sense the risks are manageable. If you are unclear about anything in the procedure you should seek clarification before beginning.

Ken
February 18, 2009, 10:15 AM
irishtkd
quote:
Originally posted by Bunk:
quote:
Originally posted by irishtkd:
The only thing I didnt measure absolutely correct was the lye...I used half a tablespoon of lye instead of a teaspoon.

Tilly's directions call for half a teaspoon of "lye". Three teaspoons = one tablespoon. You used about a teaspoon too much "lye".
quote:

Any advice would be helpful or does my experiment look correct?

Biodiesel quality is difficult to judge by appearance. If the reaction goes well it will appear good. If the reaction is marginal it can still look good.

New vegetable oil usually yields a very clean looking byproduct layer. It's sometimes hard to see the difference between the biodiesel layer and byproduct layer. Used vegetable oil gives a very dark byproduct layer. Biodiesel doesn't always look like liquid gold over a layer of tar.

It's hard to tell in your photo but it looks like your batch had a reaction and separation. It might be correct but you used three times the recommended amount of "lye". If your "lye" is NaOH it can turn the biodiesel to gel. If your "lye" is KOH it probably won't turn to gel but it will be very soapy.

Ken


Thank you, I have since bought metal measuring spoons and glass mixing pitchers so I am going to try again. I am trying to get enough WVO from our own home use to try again to see if I get a clearer seperation. I appreciate the advice!!

Just outta curiousity, what "tests" can I put my final batch through to VERFIY it is Bio-diesel? I dont want to try to make batches and then just pour them into a diesel engine and ruin the engine.

ANY HELP WOULD BE APPRECIATED.
February 18, 2009, 04:19 PM
Andrew M
quote:
Just outta curiousity, what "tests" can I put my final batch through to VERFIY it is Bio-diesel?


The 3/27 test is described here in an CBT article and here in the thread where it was introduced to this forum.


Andrew

http://biodieselcommunity.org
03 Dodge 2500 B100 homebrew
79 Rabbit B100 homebrew
February 24, 2009, 01:02 AM
StephanieD
I have made 5 dr Pepper batches of biodiesel and it is good to know there is a test for quality. I will read your recommended test and check out the batches I have made.
I hope it will work with unwashed biodiesel.
March 28, 2009, 09:00 PM
CalgaryBioDiesel
Hi all,
My friend and I made our 1st batch of bioDiesel the other day using the Dr. Pepper method.

We had 1 Liter Virgin Veg oil, 250ML methanol and 7g KOH.

When it came time to wash we did the following:
Wash 1, about 500ml, tipping the 2l bottle end over end (taking the lid, turning the bottle so the lid was at the bottom. Then similarly till the lid was at the top. repeat.) For about 30s, then drained. We repeated 3 more times with increasing force/vigor.

The book we were reading said to use 500ml and shake with vigor for the 5th wash. Now we have what looks like biodiesel on the top and Milk on the bottom. (ocassional wisp of mayo can be seen if we swirl it around).
I have pictures. Is this bioD ok or did we make emusion? (see: http://picasaweb.google.com/Ca...E7AE&feat=directlink )

This message has been edited. Last edited by: CalgaryBioDiesel,
June 27, 2009, 05:51 PM
KSanford
Hey Guys,
First, let me give my thanks to Tilly for this technique. I apologize if my question is a bit newbie-ish, but I've just made my 1st batch using this technique and I'm waiting for it to settle. My question is, how do I dump out the biodiesel and/or glycerine after it has seperated? Thanks guys, I appreciate it.


-KS
October 22, 2009, 01:49 PM
Renntag
I have not tried this method, but will be shortly. To answer the previous post, my plan was to attach a small piece of hose to a hole drilled in the bottle cap. Using a small valve at the end of the hose, the lower layer of waste can be drained out.

I can only assume that the next step would be a series of washes, settle, and drain.

After this, perform the 3/27 test.


________________________________________________________
Has anyone converted a W210 Mercedes to use SVO?
http://biodiesel.infopop.cc/ev...=857104535#857104535
October 25, 2009, 04:07 PM
Garfield
You can use the pull top off of a small water bottle that you get at the store.. Just make sure the cap threads match. Had one that did not fit good. Big mess as soon as I flipped it over.
December 19, 2009, 09:42 AM
Debbie
Hey all. Good forum. I think the links to the Dr Pepper wash and titration parts are broken. I can't read up anymore.
December 19, 2009, 10:53 AM
keelec
Ouch,
Here is why you can't find them:
http://biodiesel.infopop.cc/ev...44600361/m/947101592

Perhaps this is something that should be discussed.

I went to the new archive:
http://www.biodieseldiscussion.com/forums/index.php
http://www.biodieseldiscussion.com/forums/search.php

And put in the search criteria:
Title: Dr Pepper - selected Titles only.
Author: Tilly - select "Topic Starter Only" (first search was on Author).

I tried to "save" the searches, but it doesn't seem to be encoding in a method to save them. Go ahead and search as above. You want just articles with the Dr Pepper in the title. The best of the Dr Pepper series will also have Tilly as the topic starter, but there may be others so you can decide if you wish to include the name as "author, topic starter, or not at all". I discovered that the Titration topic did not include Dr Pepper in the title, but the link is below.

I had to do a second search for Titration as apparently it didn't have Dr. Pepper in the title.

Here are the links you're hunting for:
Dr. Pepper Wash:
http://www.biodieseldiscussion...701&highlight=Pepper

I think this is the Dr. Pepper Titration Page:
http://www.biodieseldiscussion...&highlight=Titration

This message has been edited. Last edited by: keelec,
December 19, 2009, 11:52 AM
Eurocab
Try these links:

http://biodieseltutorial.com/makingasmallbatch/\

http://biodieseltutorial.com/washingasmallbatch/
December 20, 2009, 10:29 PM
Debbie
Thanks all. Very helpful links.
February 15, 2010, 11:40 PM
Debbie
Hey all. I have been making Dr. Pepper size batches with little problems. I moved up to 10liter batches. They fail the quality tests, but not by much. I reprocessed a batch at 100ml/3.5g. I
had no more glycerin seperate out. I had a thin skin on top though. I assumed it was soap and was careful when I washed it. After about 5 washes it was clear. It has since air dryed and has passed the tests. What part of the process do I need to improve so this doesn't happen again?
February 16, 2010, 08:06 AM
Bunk
Hi Debbie.

It sounds like you're off to a good start. Now that you have moved beyond the Dr. Pepper method please consider posting questions in a new discussion in the Making Biodiesel section of the forum.

Please list all of the details of your 10 liter batches including feedstock type, feedstock titration number, feedstock moisture test results, caustic type and amount used, amount of methanol used, process temperature, mixing method, mixing time, settling time, and washing and drying methods.

What quality tests were performed and what were the resuts? Sometimes it helps to know exactly what happened in the quality tests instead of a "fail" statement.

I'm a bit unclear about the reprocess attempt. Did you try to reprocess the 10 liter batch with an additional 3.5 grams of caustic and 100ml methanol? Was the reprocess done before washing and drying?

How exactly do you air dry the batch? Is that just leaving it stand in an open bucket?

Ken