Abstract: A method for preventing a carbon dispersion from increasing in viscosity during use is described. The dispersion comprises graphite particles or carbon black particles or a combination of both dispersed in a fluid. The method involves lowering the susceptibility of the carbon dispersion to an increase in viscosity or ionic strength by lowering its pH or reducing its exposure to reactive components in the ambient atmospheric gas. The pH can be lowered by at least partially removing ammonia from the dispersion, or by adding a material that reduces the pH of the dispersion. The stability of the dispersion can also be improved by isolating the dispersion from reactive atmospheric gas. The stabilized aqueous carbon dispersion can have a viscosity of less than about 20 cps and a conductivity of less than about 3 mS.

Abstract: A useful method for the recovery of heavy metal sulfides and alkali or alkaline earth metal salts of N-substituted dithiocarbamic acids from material containing heavy metal salts of N-substituted dithiocarbamic acids.

Abstract: Disclosed is a process for the preparation of stilbene compounds such as bis(2-benzoxazolyl) stilbenes by reacting a stilbenedicarboxylate such as dimethyl-4,4'-stilbenedicarboxylate with an o-aminophenol in an organic solvent such as chloronaphthalene in the presence of a catalytic amount of a tin or titanium compound. The reaction is typically carried out at a temperature of about 200.degree.-250.degree. C. and a preferred catalyst is either dibutyl tin oxide or titanium tetra-alkoxide.

Abstract: Process is disclosed for the preparation of phenylhydroquinones by the alkylation of hydroquinone (or derivatives thereof) with the cyclohexyl moieties, cyclohexanol or cyclohexene (or derivatives thereof), followed by dehydrogenation of the intermediate cyclohexylhydroquinone.

Abstract: Disclosed is a process for preparing 2,2,4-trimethyl-1,2-dihydroquinoline compounds by reacting acetone with an aniline compound in the presence of a strongly acidic sulfonic acid-type macroreticular cation exchange resin catalyst. 2,2,4-Trimethyl-1,2-dihydroquinoline compounds are obtained in good yield and containing substantially no catalyst residue contaminant.

Abstract: Process for the preparation of Compound I by treating Compound II with X.sub.2 or SO.sub.2 X.sub.2 in the presence of a free radical initiator and an anhydride having the formula (RCO).sub.2 O while eliminating the acid halide formed having the formula RCOX from the reaction mixture, wherein Compounds I and II have the formulas ##STR1## and R is C.sub.1 -C.sub.3 alkyl, X is Cl or Br and n is 1, 2 or 3.