environmental control apparatus and instruments, namely distillation trays, contacting trays, and centrifugal separators for contacting gases and liquids in the field of oil refining and natural gas liquifaction; fluid separation apparatus for separation of gas from liquid in a chemical or oil refinery, namely, separation columns for the distillation, extraction, absorption or stripping of gas from liquid in refining operations so as to refine petroleum productions

'absorpt':51 'apparatus':3,31 'centrifug':12 'chemic':40 'column':46 'contact':9,15 'control':2 'distil':7,49 'environment':1 'extract':50 'field':21 'fluid':29 'gas':27,35,55 'gase':16 'instrument':5 'liquid':18,37,57 'liquifact':28 'name':6,44 'natur':26 'oil':23,42 'oper':60 'petroleum':65 'product':66 'refin':24,59,64 'refineri':43 'separ':13,30,33,45 'strip':53 'tray':8,10

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