35 Ill. Adm. Code 214.383
Chemical Manufacturing
Section 214
Section 214.383 Chemical
Manufacturing
Section 214.301 shall not apply
to existing hydrogen sulfide flares at a chemical manufacturing plant provided:
a) Said flares are operative on existing batch type processes;
and
b) The hydrogen sulfide emissions being flared are not, as of
September 11, 1975, passed through existing processes designed to remove sulfur
compounds from the flue gases as provided in Section 214.382(a); and
c) The emission of sulfur dioxide into the atmosphere from said
flares does not exceed 500 pounds per hour and 3500 pounds per eight-hour
period (230 kg/hr and 1590 kg/8 hrs); and
d) Provided, however, that if emission controls for said flares
become economically reasonable and technically feasible the owner/operator of
such hydrogen sulfide flares shall install such controls.