You mean that lawn weed killer?
Active Ingredients
2,4-Dichlorophenoxyacetic acid, dimethylamine salt*.....10.8%
2-(-Methyl-4-chlorophenoxy) propionic acid,
dimethylamine salt**....................................11.6%
Inert Ingredients.......................................77.6%
*2,4-Dichlorophenoxyacetic acid equivalent,
isomer specific by AOAC Method 6.D01-5: 9.0%
**2-(2-Methyl-4-chlorophenoxy) propionic acid
equivalent: 9.6%
Never heard of it.
The free 2,4-D is insoluble in water and can be filtered out after adding muriatic acid or hydrochloric acid. Evaporate the filtrate to get dimethylamine hydrochloride which can be used for making DMT or a million other things. I think heating the dimethylamine hydrochloride with quicklime or other strong base to produce dimethylamine base might be best for the last step in purifying it, ie distill it out or use to gas something with. What are the inert ingredients, BTW?
Also, everything dissolved in water when I tried it, which means it contains no solvent that's immiscible in water. After filtering it I left it to stand in a dish to evaporate, but lost interest later and forgot what I did with it. Another shelved project. I can't remember if I looked up the solubility of 2-(2-Methyl-4-chlorophenoxy) propionic acid (the free acid), but its probably insoluble in water, too.
http://www.geocities.com/dritte123/PSPF.html