epa 454 r 93 046 locating and estimating air emissions from sources of methyl ethyl ketone office quality planning standards us environmental protection agency research triangle park north carolina 27711 march 1994 disclaimer this report has been reviewed by the approved for publication any mention trade names or commercial products is not intended to constitute endorsement recommendation use ii contents section page list figures vi tables vii 1 0 purpose document reference 5 2 overview references 3 background nature pollutant production 4 secondary butyl alcohol dehydrogenation process description 6 n butane oxidation 8