Abstract: The presently disclosed seismic acquisition technique employs a receiver array and a processing methodology that are designed to attenuate the naturally occurring seismic background noise recorded along with the seismic data during the acquisition. The approach leverages the knowledge that naturally occurring seismic background noise moves with a slower phase velocity than the seismic signals used for imaging and inversion and, in some embodiments, may arrive from particular preferred directions. The disclosed technique comprises two steps: 1) determining from the naturally occurring seismic background noise in the preliminary seismic data a range of phase velocities and amplitudes that contain primarily noise and the degree to which that noise needs to be attenuated, and 2) designing an acquisition and processing method to attenuate that noise relative to the desired signal.

Abstract: A rotary pressure filter apparatus, a sealing device for use with the rotary pressure filter apparatus, and a process of using the apparatus. The rotary pressure filter apparatus is designed to treat a solid-liquid mixture under pressure in successive work zones. A rotary drum moves compartments containing the solid-liquid mixture through the successive zones. The zones are separated by a sealing member, which is designed to reduce pressure fluctuations as the compartments enter a successive zone.

Abstract: A process for the separation of the components of a solid/liquid mixture. The process Includes the use of a rotary pressure filter apparatus having improved capacity.

Abstract: Toluene disproportionation and C9/C10 transalkylation are a significant source of xylenes in a modern aromatics complex. Methods and apparatuses for improving the energy efficiency of these disproportionation and transalkylation processes are provided.