Betz Laboratories, Inc.

Scott E Lehrer

Vladimir Jovancicevic

James G Edmondson

Paul R Hart

Alan E Goliaszewski

Wiley Lyle Parker

Joseph H Niu

April Jean

A method for determining the concentration of cyanide in an aqueous system is disclosed. The method determines the cyanide concentration from a determination of reference thiocyanate concentrations and will measure the cyanide concentration in the presence of sulfides.

Methods for determining the concentration of cyanide in sour aqueous

A method for accelerating the settling of finely divided solids in hydrocarbon fluids comprising adding to the hydrocarbon a sufficient settling amount of quaternary fatty ammonium compound. Preferably, the hydrocarbon is a fluid catalytic cracker slurry containing spent catalyst fines.

Settling aids for solids in hydrocarbons

A method for neutralizing acidic species and inhibiting the deposition of amine acid salts on the internal surfaces of elevated temperature processing units in a petroleum refinery comprising adding to the hydrocarbon liquid being processed therein a tertiary amine, including trimethylamine and triethylamine.

Neutralizing amines with low salt precipitation potential

A process for adding an amine having a pKa of between 5 and 8 to a petroleum refinery distillation unit for the purpose of neutralizing acidic species contained in the hydrocarbon feedstock. The use of these amines raises the dew point pH sufficiently to prevent corrosion of the metallic surfaces of the overhead equipment while reducing the potential for the precipitation of amine salts.

Hydrocarbon soluble polyamidoamines prepared from tallowtriamine and/or tallowtetramine--(methyl)acrylate reactants are effective corrosion inhibitors for metal surfaces in contact with corrosive hydrocarbon mediums even under alkaline conditions.

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Houston, TX, United States of America

Scott E Lehrer