Betz Laboratories, Inc.

Other

Hercules Corporation

Betzdearborn, Inc.

James G Edmondson

Scott E Lehrer

E Paul Holder

Joseph H Niu

Grace B Arhancet

T Miles McCullough

S Blake Pruett

Joseph J Perugini

Inhibitor compounds containing a moiety according to this invention are used to inhibit air oxidation and thermal polymerization of furfural or furfural derivatives. A process is provided for use of the inhibitors in the solvent refining of lubricating oils where furfural is used to extract impurities including polycyclic aromatic and oxygen-containing compounds from the lubricating oils. The process provides for combination of the inhibitor with a continuously recirculating furfural stream in the extraction process.

Compounds and methods for stabilization of furfural compositions

A process for the inhibition of corrosion caused by naphthenic acid and sulfur compounds during the elevated temperature processing of crude oil by use of an aryl containing phosphite compound having one of the structures: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are C.sub.6 to C.sub.12 and at least one R group is an aryl radical.

High temperature corrosion inhibitor

A process for the inhibition of corrosion caused by naphthenic acid and sulfur compounds during the elevated temperature processing of crude oil by use of a corrosion inhibitor consisting of trialkylphosphate and an alkaline earth metal phosphonate-phenate sulfide.

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.

A composition and methods for use in oilfield waterflood systems are disclosed. The composition is comprised of a phosphonate, a copolymer, and a permanganate and is effective at inhibiting the corrosion of metallic systems in petroleum oilfields caused by chlorine dioxide. Methods of use of phosphonate and permanganate alone are also disclosed. Chlorine dioxide is used in oilfield waterflood systems to control sulfides and sulfate reducing bacteria. However, chlorine dioxide is highly corrovive to the metallic components in the processing equipment of an oilfield system. The most effective system currently used to inhibit corrosion caused by chlorine dioxide comprises chromates. However, chromates are highly toxic and their use throughout the country is becoming increasingly restricted. The use of a composition comprised of 1-hydroxyethylidene diphosphonic acid, a compolymer comprised of acrylic acid/allyl hydroxy propyl sulfonate ether and potassium permanganate has proved to be more effective than chromates as a chlorine dioxide corrosion inhibitor without the serious toxicological effects caused by the use of chromates.

Inhibitor treatment program for chlorine dioxide corrosion

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.

Method of inhibiting corrosion of metal surfaces in contact with a

A composition and methods for use in oilfield waterflood systems are disclosed. The composition is comprised of a phosphonate, a copolymer, and a permanganate and is effective at inhibiting the corrosion of metallic systems in petroleum oilfields caused by chlorine dioxide. Methods of use of phosphonate and permanganate alone are also disclosed. Chlorine dioxide is used in oilfield waterflood systems to control sulfides and sulfate reducing bacteria. However, chlorine dioxide is highly corrosive to the metallic components in the processing equipment of an oilfield system. The most effective system currently used to inhibit corrosion caused by chlorine dioxide comprises chromates. However, chromates are highly toxic and their use throughout the country is becoming increasingly restricted. The use of a composition comprised of 1-hydroxyethylidene diphosphonic acid, a copolymer comprised of acrylic acid/allyl hydroxy propyl sulfonate ether and potassium permanganate has proved to be more effective than chromates as a chlorine dioxide corrosion inhibitor without the serious toxicological effects caused by the use of chromates.

A method of neutralizing chloride ions present in a hydrocarbon medium during processing in a petroleum refinery. Nitrilotriacetic acid or its salt form is injected into the crude charge upstream of the preheat unit. Chloride levels are reduced in this way without the deleterious effects which result from treatment with the conventionally used NaOH.

Method of charge neutralization using chelants

The present invention is directed to methods of reducing the amount of hydrogen sulfide in hydrogen sulfide-containing aqueous or wet gaseous mediums without solids formation. This invention comprises adding an effective amount for the purpose of glyoxal or glyoxal in combination with formaldehyde or glutaraldehyde to the desired hydrogen sulfide-containing medium.

Method of scavenging hydrogen sulfide

The present invention is directed to the use of a reaction product of an alkynediol and a polyalkylene polyamine to control corrosion of metallic surfaces in contact with a substantially anhydrous elevated temperature mixture of a hydrocarbon and propionic acid. The method is particularly useful in controlling the corrosion of overheads in a crude unit of a refinery where problems of this nature are prevalent.

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Conroe, TX, United States of America

James G Edmondson