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