Glycerol purification

Do not know how pure you need it. But a Reverse Osmosis should do it. Need to know the molecular weight of glycerin.

Are you removing water from it, because glycerin is hygroscopic.

(It can absorb water from the air or surronding environment)

It this a by-product of transesterification of vegetable oils from a bio-diesel process?

oops I just read your email address

phoenix911

Maybe you need to look at your distillation setup and see if you can improve it. I was under the impression that distillation was capable of separating molecular densities that were only a few fractions different from each other.

Unless you want to distill something that is virtually of the same density with the same boiling point, you should be able to split them up. Look here for accurate high vacuum distillation set-up.

I wish to give you an insight into how it is done on a commercial basis. I believe you must be first getting Glycerin mixed with water (which is called Sweet water) and you distill it to get the water component out. In commercial plants this is followed by filtering the glycerin through a specially formulated (mostly proprietary- I should know because i make it for Oleon in Europe!) Active Carbon bed followed by no of filtration stages.

If you need assistance in designing equipment I will help you (as a professional for no fee!). I make my money with carbon!! just joking ..I have made enough money in my life.

Please get in touch with me on sisiraa@gmail.com

you also can buy already design proven plants from De smet, Lurgi etc

When you say the vacuum distilled glycerine is not pure enough, we need to know what IMPURITIES are present in the distilled gylcerol. Are these azeotropes? Other alcohols, other organics with boiling points (under vacuum) similar to glycerine? Afraid we can't help much if we don't know what your exact problem is.

I think, you can with additional phosoric acid (H3PO4) pure your glyserol.

this is a extraction method. but i do not know principel of method.

reza_sharafati@yahoo.co.in

Hi,

let me guess your questions! purify a glycerol is almost the same as processing an edible oil in many type of process maybe....

however, you need to understand the product composition and the standard analysis required. removal of impurities is not a problem heat up and pass it to a pure vacuum state using umbrella type diffuser, that will evaporate completely. changing its color to lighter is another process that has to be subject to much higher temprature to break that molecules and evaporate too. removal of other carbon atoms to change its viscosity and other specs limitations, that has to be known what is the specs of pure glycerol.

The process parameters of the above is not an easy way to build in a pilot plant at all. pure vacuum system need acurate equipment using steam jet ejector or maybe other type of vacuum equipment.

Removal of impurities from a high temperature requires sparging steam for evaporation reaction inside the vessel. or maybe not if impurities are light, enough without sparging in trays.

please correct if i'm wrong about glycerol as mentioned above.

jojie_oak