...by some, but not all, petroleum refineries producing hydrogen from catalytic reforming operations. ^Excludes amounts produced and consumed in the manufacture of synthetic ammonia or ammonia derivatives. "Value of shipments of lower purity oxygen included with "Other gases, nec" 20Excludes hydrocarbon...

...of electrolytic hydrogen and 1*7,444 million cu. ft. in 1959, that was produced from other sources. "Excludes amounts produced and consumed in the manufacture of synthetic ammonia or ammonia derivatives. 197alue of shipments of lower purity oxygen included with "Other gases, nee." ^Excludes hydrocarbon...

...nil. petroleum refineries producing hydrogen from catalytic reforming operations. 18Ехс1цдев amounts produced and consumed in the manufacture of synthetic ammonia or ammonia derivatives. ^Value of shipments of lower purity oxygen included with "Other gases, nee." 20Excludes hydrocarbon...

...Interior, Bureau of (.fines. 19 7alue of shipments of lower purity oxygen included with "Other gases, nee." "Excludes amounts produced and consumed in the manufacture of synthetic ammonia or ammonia derivatives. ^Excludes hydrocarbon gases such as propane, butane and propylene or halogenated hydrocarbons and cyclopropane,...

...earlier periods. 5 Low purity nitrogen (less than 99.5%) included beginning January 1971. Data exclude amounts produced and consumed in the manufacture of synthetic ammonia or ammonia derivatives. 6 Low purity oxygen (less than 99.5%) included beginning January 1970. Source: US International Trade...