Don't know if this is helpful or not. I've been searching for a list of banned items and it includes lots of stuff (including pencil erasers of all things), but this is a link to the UN resolution that describes the import/export mechanism in place for Iraq.
I suppose it's possible some of this stuff is dual use, but not when the military is requesting it!
Iraq elected to develop a local capacity for thiodiglycol production using ethylene oxide and hydrogen sulfide obtained from its petroleum industry. By the end of the Iran-Iraq war, they had the capability to produce mustard gas without the need to use outside suppliers for precursors (although they still bought hydrochloric acid abroad because they could do so relatively cheaply and - by claiming a different use - easily). They were thus effectively immune to the opinions - and the sanctions produced by those opinions - of the international community.
What was the chemical in the drums that we kept finding as we were rolling into Baghdad...?