- 12-02-2003, 11:50 PM
One of the by-products when conversion to PEG (at the processing plant) is ethylene glycol (EG).
Think of a fractioning column for petroleum products; the heavier molecular weights (higher viscosity, thicker) stay lower in the column because of their higher melting point -- they boil off, or are drawn off, last. the smaller the hydrocarbon chain, the lower the boiling point to distill out (purify) the end product.
PEG-200 (lightest of the PEG viscosities) has a boiling point roughly equal to (within 3 degrees C@ 760torr) ethylene glycol. EG is the primary constituant of automotive anti-freeze, and as you've heard all your life, is very toxic (sweet to the taste, but deadly). The problem with PEG is it's somewhat more difficult to purify PEG-200 than the other viscosities, requiring a more complicated (and expensive) multi-plate (vacuum) distillation process. This is also one big reason why PEG-200 is difficult to get in NF/USP grades at a reasonable price (in bulk for resale).
PEG-300, on the other hand, is almost as attainable as PEG-400, and is basically the same price. I do not know why it is not being carried.
Last edited by GIJoe; 12-06-2003 at 10:53 AM.
- 12-05-2003, 08:44 PM
You'll post more later if the board leadership gives you permission...
Don't come on my forum spewing advertisements for your site without running it by me first.
12-06-2003, 12:46 AM
12-06-2003, 12:54 AM
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