Figure 2.8 shows the essential features of a refinery catalytic cracker. This particular reaction is accompanied hy the deposition of carhon on the surface of the catalyst. The fiuidized-hed reactor allows the catalyst to he withdrawn continuously and circulated to a fiuidized regenerator, where the carhon is burnt ofi" in an air stream, allowing regenerated catalyst to he returned to the cracker.  [c.59]

Curran, M. A., Broad-Based Environmental Life Cycle Assessment, Environ. Sci. Technol, 27 430 1993.  [c.298]

It may be regarded as the parent of a number of important classes of compounds derived from the y-pyrone skeleton (e.g. flavone, xan-thone) and the important chroman derivatives called the tocopherols (vitamin E).  [c.97]

Chromium pentafluoride, CrFs. Red, m.p. 30 C (CrFa plus F2 at 350-500 C).  [c.98]

The higher chromium fluorides, CrF[c.99]

H2N-CH2C0-CH2CHjC02H. The base unit in the biosynthesis of porphyrins and so furnishing all the carbon and nitrogen atoms in the haem of haemoglobin, myoglobin, cytochromes, catalase and peroxidase as well as the dihydroporphyrin ring of chlorophyll. It is also incorporated into the corrin ring of vitamin Bi2. 5-Aminolaevulinic acid is formed from succinyl coenzyme A and glycine. Condensation of two molecules yields porphobilinogen (a pyrrole derivative) and four molecules of this condense to give the porphyrin skeleton.  [c.29]

Chromium IV) chloride, CrCU. Formed CrClj and CI2 at 600-700 C followed by rapid cooling. Decomp, above — 80 "C.  [c.98]

Chromium(IH) chloride, chromic chloride, CrClj. Violet solid (Cr plus CI2, hydrate plus SOCI2) only soluble in water in presence of Cr. Forms many complexes including the hydrates [Cr(H20)6]Cl3 - violet, [Cr(H20)jCl]Cl2,H20 - green, [Cr(H20)4Cl2]Cl,2H20 - green.  [c.98]

Chromium(IJ) chloride, chromous chloride, CrCl2- White solid (Cr plus HCl gas) dissolving to give a blue solution. Forms hydrates, widely used as a reducing agent.  [c.98]

Cr(02CCH3)2]2,2H20. Red insoluble compound formed from sodium ethanoate and CrC)2 in aqueous solution. The most stable Cr(II) compound contains a Cr —Cr bond, chromium fluorides  [c.98]

Chromium tetrafiuoride CrF4. Green, sublimes lOO C (CrFa plus Fj).  [c.99]

See pages that mention the term Curium : [c.38]    [c.149]    [c.150]    [c.311]    [c.13]    [c.20]    [c.45]    [c.45]    [c.45]    [c.49]    [c.56]    [c.86]    [c.88]    [c.88]    [c.88]    [c.91]    [c.93]    [c.96]    [c.96]    [c.97]    [c.97]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.98]    [c.99]    [c.99]    [c.99]    [c.99]    [c.99]   
Chemistry of the elements (1998) -- [ c.1252 , c.1262 ]