Buy our Pretty Good BioDiesel Book
Free Hand Soap Recipe.
How to Make Hand Soap out of waste Glycerol
Making BioDiesel results in a byproduct
glycerin or glycerol.
This Glycerol can easily be recycled into a good quality Bar type Hand Soap using this recipe.
Glycerol through an old pair of pantyhose to remove impurities.
Heating it up
slightly may be required to turn it liquid again.
Heat RAW Glycerol to 160F in an
old stainless steel pot to evaporate out residual methanol.
Do not use a container made of aluminum.
In another stainless steel pot
measure out 1 Qt of water per gallon of Glycerol & heat to 100F.
(Lye eats aluminum so do not use any aluminum
pots or utensils for this)
Slowly add 5.5 oz. of Red Devil Lye
(Sodium Hydroxide) per gallon of glycerin to the hot water & mix until
dissolved. Be careful do not breathee any lye dust and it is best to do this outside.
Pour the lye water mixture into
the glycerin & continue to heat the glycerin for another ten minutes while
mixing. Turn off the heat & mix for another ten minutes at a slow
speed. (20 mins. total mix time)
The mixture may foam up slightly
and form soap bubbles, that is ok. After mixing is complete, the soap
poured into a container and allowed to cool.
3 gallons of melted soap will
make about ninety 2 x 3 x 1 1/2" thick soap bars.
To do this you will need two 28 qt.
Plastic sweater containers (buy them cheap at Wal-Mart).
Pour the melted soap
into the containers to the desired thickness and cover with a piece of cardboard
or plywood to help hold the heat in, and let set for 24 hrs.
After cooling 24 hr, the (green)
soap will be ready to be removed and cut into bars. Use a butter knife or
knife to slice around the inside edge of the container so you can release the
green soap from
the sides of the plastic containers.
Quickly flip the container
upside down over a piece of newspaper or cardboard. You may need to tap
on the bottom of the container to help it release and drop out. You should now
have an evenly
shaped "slab" of (uncured or green) soap which can be cut into
individual bars. Each slab will produce
about 45 bars of soap measuring 2" X 3"
uncured or green soap can burn your skin so allow the soap to age cure in a dry
cool area for
between 1 to 2 weeks before using. When first cut the (green) soap will
appear dark in color, but will
eventually lighten to a tan color as drying (curing)
progresses. The resulting soap is a long lasting bar
with good cleansing
abilities leaving no greasy residues.
This cured soap can be stored in
plastic zip lock bags or placed in plastic tubs in layers with waxed paper
between each layer or individually wrapped in paper and kept in a cool place
until ready for use.
Fragrances or dyes can be added
during the mixing process to improve color and scent. Some people use
squeezed oranges for the citric acid, which helps with cutting grease, and gives
the soap a
citrus aroma. Another idea is to scent it with cinnamon since it is
naturally a brownish color.
Total cost per bar
of soap is around 15 cents per bar, recipe makes aprox 90 bars.