Conditioning tanks

Figure 12-5. The Lummus Crest Inc. process for producing polystyrene " (1) reactor, (2) holding tank (Polystyrene beads and water), (3) centrifuge, (4) pneumatic drier, (5) conditioning tank, (6) screening of beads, (7,8) lubrication and blending, (9) shipping product.

HAZARD RISK Fire hazard when exposed to heat or flame moderate explosion hazard gas more dangerous than vapor under fire conditions tank rupture produces accumulation of toxic fumes explosive reaction with nitrogen oxides, performic acid and peroxide decomposition emits acrid smoke and fumes NFPA Code H 3 F 4 R 0. 

A brewer racks beer from an 8001 fermentation tank into 7.93 gal (US) conditioning tanks. How many tanks are filled if0.200 ft are lost for each tank and they are filled to 98% of their capacity M. Bourassa-Bedard... 

The pressure leach circuit for this concentrate is estimated to consist of one 2.7 m diameter by 16 m long autoclave with six 45 kW agitators, plus feed solution and slurry pumps and agitated flash and conditioning tanks. A 45 t/d oxygen plant is included, as is a seal water circuit. The overall installed capital cost for this circuit is estimated at 8.82 million. 

The isomerization of a-acids is catalysed by calcium or magnesium ions, either in methanol solution or the solid state, without the formation of humulinic acid [86]. In the latter case the calcium and/or magnesium salts of the a-acids are heated at 70°C for 20 min to effect the isomerization. The iso-a-acid salts are usually ground to a fine powder (particles < 10 [tm) which is added to conditioning tanks where a contact time of at least 24 hr is necessary to achieve 85% utilization [121]. A modification of this process involves heating stabilized hop pellets, in which the a-acids are in the form of their calcium or magnesium salts, at 80°C for 2 hr to form isomerized pellets which contain the calcium and/or magnesium salts of iso-a-acids [122]. 

It has been claimed that the lethal rate is enhanced when carbonated instead of noncarbonated beer is used. The most resistant of the normal brewery contaminants are members of the lactic acid bacteria and certain species of Saccharomyces, e.g. S. pastorianus. Special difficulties attend the pasteurization of returned beer where the level of contaminants may be very high. However since such beer may be filtered before pasteurization and is usually blended into conditioning tank at low rates, the adverse effect on flavour of using a large number of pasteurization units may be discounted. With normal beers, excessive pasteurization leads to cooked, biscuity flavours, especially when the dissolved oxygen content of the beer is high (say in excess of 0-3 mg/1). 

The RIM machine, including at least two metering pumps, a selfcleaning impingement mixer, a set of temperature-controlled conditioning tanks, and the piping, hoses, filters and controls required for operation. 

The electrochemical cell was scaled up to a volume of 23 L, exhibiting the capacity to treat 6 m of wastewater per day. Electrodes of parallel aluminum plates were used, incorporating potential for polarity inversion in order to avoid incrustation. Based on the pilot unit results, the clarifier was modified with internal conduits serving as transition zones to turn turbulent to laminar flow and enhance electroflocculation. Sludge from sedimentation and electroflotation was sent to a conditioning tank and then to a horizontal plate pressure filter to produce a dry filter cake. Clear effluent was filtered... 

Therefore, the actual temperature in the conditioning tank of the furnace is about 30 K higher than that in the feeders head in order to compensate for cooling of the melt during its transport. 

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