Centrifuges baffle

Inverting bag centrifuge Screen baffle centrifuge Single and multi- stage pusher... 

The unit has virtually the same flow sheet (see Fig. 2) as that of methanol carbonylation to acetic acid (qv). Any water present in the methyl acetate feed is destroyed by recycle anhydride. Water impairs the catalyst. Carbonylation occurs in a sparged reactor, fitted with baffles to diminish entrainment of the catalyst-rich Hquid. Carbon monoxide is introduced at about 15—18 MPa from centrifugal, multistage compressors. Gaseous dimethyl ether from the reactor is recycled with the CO and occasional injections of methyl iodide and methyl acetate may be introduced. Near the end of the life of a catalyst charge, additional rhodium chloride, with or without a ligand, can be put into the system to increase anhydride production based on net noble metal introduced. The reaction is exothermic, thus no heat need be added and surplus heat can be recovered as low pressure steam. 

Other modifications have special but more limited apphcations. A centrifugal bowl may contain, instead of disks, several aimular baffles that take the hquid through a labyrinth path before discharge. The multiple cylinders increase cake capacity to as much as 70 L for easily sedimented sohds. This centrifuge is used for clarification of food symps and antibiotics (qv), and for recovery of heavy metallic salts and catalysts (see Fig. 14c). 

The feed slurry is introduced into the lower portion of the bowl through a small orifice. Immediately downstream of the orifice is a distributor and a baffle assembly which distribute and accelerate the feed to circumferential speed. The centrate discharges from the top end of the bowl by overflowing a ring weir. Solids that have sedimented against the bowl wall are removed manually from the centrifuge when the buildup of solids inside the bowl is sufficient to affect the centrate clarity. 

In this case, a controlled quantity of water is discharged against a rapidly rotating disk where centrifugal force spins the droplets radially against circumferentially placed baffles, producing a fine water mist which is discharged into the airstream. 

Lines in vacuum service, 135—141 Line symbols, 17, 23 Numbering, 23 Lined centrifugal pumps, 171 Liquid-solid particle, separators, 228 Baffle type specifications, 248 Baffle type, 247, 248 Centrifugal, 256, 259-261 Chcvron-vanc, 248, 235 Comparison chart, 230 Cyclone, 259 Specification form, 268 Vane, 259 Wire mesh, 246 York-vane, 248 Low pressure storage... 

Primary steam separators These devices are located horizontally, immediately above the top drum waterline and use baffles or chevrons and dry pipe collectors, or cyclone or centrifugal action to radically change the steam flow, resulting in the heavier water and contaminants separating out from the steam. 

Cyclones are more efficient than gravity and baffle chambers, and also occupy less space. The dust-laden gas makes a tangential entry into a cylindrical or conical chamber. The dust particles travel outwards to the outer wall due to centrifugal forces there they collide with the wall and fall downwards to the receiver chamber, whilst the gases escape from an opening provided at the top. 

Culture and bioconversion. The precultured cells were recovered by centrifugation at 4 °C and the cell pellet was inoculated into a 3 L fermenter (stirred tank with two Rushton turbine impellers and four baffles) containing 1.0 L of supplemented M9 medium. 

Fig. —Deflector baffle aeparates oil and gas by forcing directional and velocity changes on flowatrotm. Cyclone inlet achieves same result with centrifugal force... 

---