Batch-forming process

In a typical batch suspension process (Figure 12-5), styrene is suspended in water by agitation and use of a stabilizer. The polymer forms beads. The bead/water slurry is separated by centrifugation, dried, and blended with additives. 

No enzymatic side effects are observed and substrate concentrations up to 20% by weight can be used without affecting the enzyme activity. The biocatalyst is used in soluble form in a batch wise process, thus poorly soluble amino adds can be resolved without technical difficulties. Re-use of the biocatalyst is in prindple possible. 

Antiblock agents like talc, chalk or silica can be used in form of masterbatches [23, 25]. The antiblock batches for processing Ecoflex and Ecovio are sold by BASF under the name Ecoflex Batch AB 1 or AB 3. 

Assumptions Synthesis of phenylpyruvic acid Batch synthesis process for precursors overal yield of 95+% of theoretical to pheny Ihydantoin overall yield of 90+% of theoretical from phenylhydantoin to phenylpyruvic acid recovery and recycle of acetic acid no byproduct crec taken for acetic acid formed from acetic anhydride addition. Conversion of phenylpyruvic acid and aspartic acid. Bioreactor productivity of-18 g PHE/L/h (four columns in parallel) 98% overall conversion no byproduct credit taken for pymvic acid (recovery cost assumed to be of by revenue from sale) 80% recovery of L-PHE downstream of bioreactor. 

The general mode of operation of a cyclic batch adsorption process is illustrated in Fig. 8. In its simplest form such a process employs two adsorbent beds, each of which is alternately saturated and regenerated. During the saturation or adsorption cycle, adsorption is continued until the mass transfer zone has almost reached the bed outlet. At this point the beds are switched so that the spent bed is replaced by a freshly regenerated bed, while the more strongly absorbed species is removed from the spent bed in... 

The choice of a particular forming process depends upon the geometric shape of the component being manufactured. The required end product properties such as density and the batch size are also important. 

Table 5.5-1. Water Content of Porcelain Batches for Different Forming Processe.s.

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