Nalco Chemical Company

Morris Kaplan

William K Stephenson

John C Kisalus

William A Lindley

The present invention provides a method for inhibiting fouling deposits in refinery processing equipment caused by the heat treatment of hydrocarbon feedstocks. The deposits are inhibited by adding to the feedstock an effective amount of an iron sulfide dispersant prepared in accordance with this invention. The dispersants comprise polyimides which are prepared by reacting fatty amines with maleic anhydride/alpha-olefin copolymers.

Inhibiting fouling employing a dispersant

A method of dispersing asphalt/asphaltene comprising an admixture of polymer A and polymer B ranging from 90 to 10 weight percent A to from 10 to 90 weight percent B. Wherein polymer A is an alkyl substituted phenolformaldehyde liquid resin having a weight average molecular weight ranging from about 1000 to about 20,000 and an alkyl substituent containing from 4 to 24 carbon atoms, with alkyl substituent may be linear or branched alkyl group. Polymer B is a hydrophilic-lipophilic vinylic polymer.

Asphaltene dispersants - inhibitors

An asphalt/asphaltene dispersant comprising an admixture of polymer A and polymer B ranging from 100 to 10 weight percent A to from 10 to 100 weight percent B. Wherein polymer A is an alkyl substituted phenol-formaldehyde liquid resin having a weight average molecular weight ranging from about 1000 to about 20,000 and an alkyl substituent containing from 4 to 24 carbon atoms, with alkyl substituent may be linear or branched alkyl group. Polymer B is a hydrophilic-lipophilic vinylic polymer.

An improved method for reducing fouling and corrosion of ethylene cracking furnaces petroleum feedstocks, the improvement comprising treating the petroleum feed stock with at least 10 ppm of a combination of a phosphorous antifoulant compound and a filming inhibitor. The antifoulant compound is chosen from the group consisting of phosphite esters, phosphate esters, thiophosphite esters, thiophosphate esters and mixtures thereof, said esters being characterized by the formulas ##STR1## where X equals S or O, and R.sub.1, R.sub.2, and R.sub.3, are each independently selected from the group consisting of hydrogen, water soluble amine, alkyl, aryl, alkaryl, cycloalkyl, alkenyl, and aralkyl group provided that in at least one and not more than two of each R.sub.1, R.sub.2, and R.sub.3 are water soluble amines having partition coefficients greater than 1.0 mixed with a filming amount of at least 2-20 ppm imidazoline filming inhibitor prepared preferably from naphthenic or fatty acids and poly amines.

Ethylene furnace antifoulants

An aqueous sol composition from the group consisting of antimony and tin sols useful in restoring the activity of metal contaminated molecular sieve cracking catalysts which comprises a major portion of an aqueous antimony sol or tin sol containing between 1-50% by weight of antimony oxide as Sb.sub.2 O.sub.5 or tin oxide as SnO.sub.2 and between 0.1-20% by weight of a compatable water-soluble surfactant which is capable of producing a water-in-oil emulsion and having an HLB of at least 6.0.

Self-dispersing tin oxide sols

An improved method of reducing fouling and corrosion in ethylene cracking furnaces using petroleum feedstocks, the improvement comprising treating the petroleum feedstock with at least 10 ppm of a compound chosen from the group consisting of phosphite esters, phosphate esters, thiophosphite esters, thiophosphate esters and mixtures thereof, said esters being characterized by the formulas: ##STR1## where X equals S or O, and R.sub.1, R.sub.2, and R.sub.3, are each independently selected from the group consisting of hydrogen, water soluble amine, alkyl, aryl, alkaryl, cycloalkyl, alkenyl, and aralkyl group provided that in at least one and not more than two of each R.sub.1, R.sub.2, and R.sub.3 are water soluble amines having partition coefficients greater than 1.0.

Use of phosphate and thiophosphate esters neutralized with water soluble

An aqueous antimony sol composition useful in restoring the activity of metal contaminated molecular sieve cracking catalysts which comprises a major portion of an aqueous antimony sol containing between 1-50% by weight of antimony oxide as Sb.sub.2 O.sub.5 and between 0.1-10% by weight of a compatible water-soluble surfactant which is capable of producing an oil-in-water emulsion and having an HLB of at least 8.0.

Growing community of inventors

Houston, TX, United States of America

Morris Kaplan