Separation of Pinenes

Both Abcor and Elf-SRTF have developed gas chromatographic processes for the separation of a and ji pinenes. The processes, which are similar in general principle and differ mainly in the methods used to pack the column, are compared in Table 10.1. By improvements in column-packing technology Elf-SRTI were able to eliminate baffles and still achieve a reasonably low HETP in a production scale column. (// 1.0 mm for a 40 cm. diameter column.) However, even in the largest of these units throughput is only about 

TABLE 10.1. Comparison of Chromatographic Processes for Separation of a and fi Pinenes 

Date Adsorbent Abcor 1968 Chromasorb + Elf-SRTl 1973 20% Carbowax 

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The adsorptive separation of pinenes on Zeolites is reported.303 The C-6 and C-7 13C n.m.r. chemical shifts in bicyclo[3,l,l]heptanes support other known conformational evidence and confirm that cls-pinane and ds-myrtanol (209 X = OH) have a bridged-boat conformation, that trans-myrtanol has a bridged-chair conformation, and that trans-2-pinanol and myrtenol (210 X = OH) have Y-shaped conformations verbenone (211 R R2 = O), and trans-verbenol (211 R1 = H, R2 = OH) give anomalous results which may be due to a conjugation effect the bridged-chair... 

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