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When the chromatographic method of Stagg and Reed (CA 51, 16208a) was applied to tech. Ph2NH containing PhNH2 a small amount of 4-aminobiphenyl was generated.The mechanism was explained on the basis of the formation of the free Ph radical at the R salt coupling stage with the diazotized PhNH2.The error due to this side reaction became significant if more than 1% PhNH2 was present, or if the method was used in either PhNH2 alone or in the analysis of other primary aromatic amines.To suppress the side reaction, a concentration of 0.5 M R salt as a coupler was recommended.

Erdoel und Kohle, Erdgas, Petrochemie vereinigt mit Brennstoff-Chemie

Hydrofining coke oven crude benzene by the litol process

Author: Wark, Thomas

The process is a single step catalytic hydrogenation in which S is removed as H2S, paraffins and naphthenes are hydrocracked, styrene is hydrogenated to ethylbenzene (I), and compounds, such as I are dealkylated.The main cause of nonselectivity is the condensation of aromatic rings to form compounds, such as biphenyl.The process can also be used with middle heavy oil to yield purity naphthalene.The olefinic products are removed by clay treatment.The catalyst was regenerated after throughputs of 8, 20, 19, and 18 M gal, resp.The nominal consumption of H is 0.4 m3/gal feed, of steam is 3.7-4.1 kg/gal feed, and of cooling water is 60 m3/m3 feed.

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