{HEAD ~ Discoloration} of maleic anhydride is minimized by first passing the maleic anhydride in {TAIL ~ molten or dissolved form} through a bed of cation exchange resin and then adding to the maleic anhydride a small amount of 3,3 thiodipropionitrile 
{ HEAD ~ Discoloration } of maleic anhydride is minimized by first passing the maleic anhydride in { TAIL ~ molten or dissolved form } through a bed of cation exchange resin and then adding to the maleic anhydride a small amount of 3,3 thiodipropionitrile
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH