Short capacity data

Styrene is produced by the catalytic dehydrogenation of ethyl benzene (EB) in a two-stage fixed-bed adiabatic reactor. Equilibrium and heat capacity data are as given shortly. 

For data storage two types of memory are distinguished (/) main memory with moderate capacity (currentiy 4 x 10 bit in each element) and extremely short access time (<10 s), and (2) mass memory with very high capacity (>10 bit in each element) and moderate access time (>10 s). 

Short- to medium-term exposure has shown neurotoxicity, developmental toxicity, immunotoxicity, and endocrine disruption to be relevant end-points. Table 24 summarizes the critical studies for each compound and identifies NOAELs or LOAELs. The degree of each of the toxic end-points differs across the group as a whole. For example, tributyltin is well established as an aromatase inhibitor, and dibutyltin appears to have some potency also (exact characterization of the endocrine disrupting capacity of dibutyltin alone is difficult because of the presence of tributyltin as an impurity). Monobutyltin and mono- and dioctyltins have no aromatase inhibiting capacity in in vitro tests. No data are available for this end-point for the methyltins. 

A detector plays an important part in achieving overall performance when optimizing for very short run times with reasonable peak capacities. The detector should match the optimized LC conditions in terms of flow rate and dispersion. The electronics must accurately capture the peak form produced by the column this is most important for quantitative analyses. The data quality may be limited by the laws of physics at high speed. The amount of data produced over time can become an issue. 

Figure 17.21(a), and some temperature profiles in Figures 17.22(d) and 17.23(e). For modern high capacity performance in single units, reactors with short travel paths through the catalyst and pressures below 200 atm are favored. Comparative performance data over a range of conditions appear in Figure 17.22. 

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