Abstract: A method for controlling the formation of fouling deposits in a liquid hydrocarbonaceous medium, wherein in the absence of such fouling inhibition, fouling deposits would normally be formed within said medium is disclosed. The method comprises adding to said medium an antifoulant composition comprising a basic antifouling compound, component (1), selected from the group consisting of alkyl phosphonate phenate sulfide, alkaline earth alkyl phosphonate phenate sulfide, an amine neutralized alkyl phsophonate phenate sulfide, or mixtures thereof, and at least one additional antifouling compound selected from components (2), (3) and (4) wherein component (2) is an effective antioxidant compound adapted to inhibit oxygen based polymerization of said hydrocarbon or petrochemical, component (3) is a corrosion inhibiting compound, and component (4) is a metal deactivator. The process comprises adding from about 0.

Abstract: Multifunctional process antifoulant compositions and methods are disclosed. The compositions comprise (1) a polyalkenylthiophosphonic acid or ester thereof, and at least one additional antifouling component selected from the groups (2), (3) and (4) wherein (2) is an effective antioxidant compound adapted to inhibit oxygen based polymerization of said hydrocarbon or petrochemical, (3) is a corrosion inhibiting compound, and (4) is a metal deactivator. The process comprises adding from about 0.5-10,000 parts of the combination of (1) and additional antifoulant component(s) to the particular petrochemical or hydrocarbon for which multifunctional antifouling protection is desired.

Abstract: The present invention is directed to a method of using cerium and/or cerium contaning compounds to passivate nickel contaminants in hydrocarbon feedstocks which are used in catalytic cracking processes.

Abstract: Methods for inhibiting coke formation in pyrolytic reactors and furnaces are disclosed wherein effective alkaline earth metal salt coke retardant treatments are used. Exemplary coke retardant treatments include magnesium and calcium salts such as the acetate, chloride, and nitrate, and magnesium sulfate salt.

Abstract: A method for controlling the formation of fouling deposits in a liquid hydrocarbonaceous medium during processing at elevated temperatures is disclosed. The method comprises adding to said medium an antifoulant compound comprising an alkaline earth alkyl phosphonate phenate sulfide, an alkyl phosphonate phenate sulfide, an amine neutralized alkyl phosphonate phenate sulfide, or mixtures thereof.

Abstract: Methods for controlling the formation of fouling deposits in petroleum hydrocarbons or petrochemicals during processing at elevated temperatures are disclosed. The methods comprise adding from about 0.5-10,000 ppm of an amine salt of polyalkenylthiophosphonic acid to the desired petrochemical or hydrocarbon.

Abstract: Methods for controlling the formation of fouling deposits in petroleum hydrocarbons or petrochemicals during processing at elevated temperatures are disclosed. The methods comprise adding from about 0.5-10,000 ppm of a Group II(a) cation salt of polyalkenylthiophosphonic acid to the desired petrochemical or hydrocarbon.

Abstract: Multifunctional process antifoulant compositions and methods are disclosed. The compositions comprise (1) a polyalkenylthiophosphonic acid or ester thereof, and at least one additional antifouling component selected from the groups (2), (3) and (4) wherein (2) is an effective antioxidant compound adapted to inhibit oxygen based polymerization of said hydrocarbon or petrochemical, (3) is a corrosion inhibiting compound, and (4) is a metal deactivator. The process comprises adding from about 0.5-10,000 parts of the combination of (1) and additional antifoulant component(s) to the particular petrochemical or hydrocarbon for which multifunctional antifouling protection is desired.

Abstract: The present invention is directed to a method of reducing fouling and corrosion in furnaces during the thermal cracking of hydrocarbons. The method generally comprises adding to the hydrocarbon an effective amount of boron or boron compounds. The preferred boron materials are the oxides, borates, borate esters, peroxyborates, boranes, organoboranes, borazine and salts of boron oxides. The oxides, borates or salts thereof, are preferable in non-mono-alcohol solvents.

Abstract: The present invention is directed to a method of inhibiting the formation of coke during the elevated temperature cracking of hydrocarbons. The method generally comprises adding to the hydrocarbon an effective amount of an ammonium borate, particularly ammonium biborate and ammonium pentaborate. Preferably, the ammonium borates are in a glycollic solvent or water.

Abstract: The present invention is directed to a method of inhibiting the formation of coke during the elevated temperature cracking of hydrocarbons. The method generally comprises adding to the hydrocarbon an effective amount of an ammonium borate, particularly ammonium biborate and ammonium pentaborate. Preferably, the ammonium borates are in a glycollic solvent or water.

Abstract: This invention is directed to a method of using tin to passivate cracking catalysts contaminated with vanadium. The improvement resides in the use of tin alone without the need for synergists such as antimony, phosphorus, and/or sulfur compounds.

Abstract: A method for controlling the formation of fouling deposits in a petroleum hydrocarbon or a petrochemical during processing at elevated temperatures, comprising dispersing within said petroleum hydrocarbon or petrochemical an antifouling amount of a polyalkenylthiophosphonic acid or ester thereof.