Abstract: Systems and methods for separating a mixture of olefinic and paraffinic C4 components are disclosed. The systems and methods include adsorptive equipment and adsorptive processes for separating components from the mixture.

Abstract: Primary vibrations (N), e.g. acoustic noise or vibration from a source thereof such as a motor, are cancelled by secondary vibrations (C) produced by an actuator (2) driven by a controller (3) that is responsive to an error signal (E) detected by a detector (4) and representative of the residual or difference between the primary and secondary vibrations. The controller samples the error signal (E) during successive sampling periods determined by a synchronising signal (syn) taken from the motor. The secondary vibrations C.sub.n+1 for a sampling period n+1 are determined as follows: C.sub.n+1 =C.sub.n -.mu.E.sub.n SGN[1/H], where C.sub.n represents the secondary vibrations produced during a preceding sampling period (n); E.sub.n represents the detected error signal for said preceding period n, H represents the transfer coefficient between the actuator (2) and the detector (4) and .mu. is a scaling factor where 0.ltoreq..mu..ltoreq.1.