Flavonoids ofGoebelia pachycarpa
The following substances were isolated and were identified on the basis of chemical and spectral characteristics: kaempferol, quercetin, and genistein. A fourth compound C26H2sO14 (I), mp 125-128°C, [a]~ 2 --34.4 ± 2 ° (c 1.05 MeOH) was an isoflavone derivative according to its UV spectrum (%maxethanol, nm: 263, 328 sh; log g 4.56, 3.73) [i]. Its IR spectrum contained absorption bands at (cm -I) 3527-3295 (OH groups), 1660 (C=O of a a-pyrone), 1622, 1589 (aromatic ~ bonds), and 1098-1040 (C O vibrations of glycosides).
Isoflavonoids in the Roots of Thermopsis fabacea D. C. (Leguminosae)
Nine isoflavonoids (I-IX) were isolated from the roots of Thermopsis fabacea D. C. (Leguminosae). The methanol extract afforded formononetin (I) and daidzein (II), the ethereal extract afforded trifolirhizin (III), dl-maackiain (IV), genistein (V), and 7, 3'-dihydroxy-4'-methoxyisoflavone (VI), and the ethyl acetate extract afforded formononetin-7-O-β-D-glucoside (VII), daidzin (VIII), and genistin (IX). These compounds were identified by means of degradation, spectroscopic studies, and direct comparison with authentic samples.
Research on velocity distribution in semi-dry flue gas desulfurization tower
As an accurate high-quality instantaneous measurement technology, particle image velocimetry (PIV in acronym) has applied widely in single-phase flow and multiphase flow. The velocity distribution in semi-dry FGD tower directly influences gas-solid mix and contact situation. In base of the tower, gas-solid two-phase flow field is more complex, and has the quite tremendous influence to the overall system desulphurization efficiency. This paper utilized PIV to study velocity distribution in Semi-dry flue gas desulfurization tower and obtained velocity distribution.