Abstract: A method of controlling the fouling potential of macroinvertebrates, such as mollusks in aqueous systems which comprises adding to the system an effective controlling amount of an alkylthioalkylamine or acid addition salt thereof.

Abstract: Methods are disclosed for inhibiting coke formation in pyrolytic reactors or furnaces during the pyrolysis operation. Rare earth elements or compounds thereof, such as cerium and lanthanum elements or compounds, are added to the particular hydrocarbonaceous medium undergoing such pyrolysis.

Abstract: Methods of scavenging hydrogen halide species from hydrocarbon liquids are disclosed. Preferred scavengers includes allyl alcohol, benzyl alcohol and tertiary alcohols such as tert-butyl alcohol.

Abstract: A method for treatment of boiler waters is disclosed. The method comprises a synergetic combination of ametacrylic acid-containing polymer with a strongly interacting nonionic surfactant, together with a chelant and/or a phosphate-generating species. The method is particularly effective when the surfactant is an alkoxylated alkylphenol or an alkoxylated alkylphenol ether.

Abstract: A method for inhibiting the formation of polymeric based fouling deposits normally formed during the caustic washing of hydrocarbons is disclosed. The method comprises adding an effective amount for the purpose of an ethylenediamine compound (e.g., ethylenediamine, diethylenetriamine, etc.) to the caustic wash system.

Abstract: In the desalter operation of a petroleum refinery, a method which measures and regulates the stability of the oil-in-water emulsion. A device located downstream of the desalter monitors the electrical charge of oil droplets in the effluent brine. This charge reflects emulsion stability. The amount of charge streaming past a point defines a current. When a predetermined streaming current threshold is crossed, the monitoring device electrically sends a signal proportional to the excess to a metering pump or valve which adds a predetermined proportional quantity of emulsion breaker to the petroleum/water mixture in the desalter.

Abstract: A water soluble polymer composition is disclosed. The polymer has repeat units characterized by the structural formulae: ##STR1## wherein R.sub.1 is H or lower alkyl (C.sub.1 -C.sub.3); R.sub.2 is OH, OM, or NH.sub.2 ; M is a water soluble cation; R.sub.3 is a hydroxy substituted alkyl or alkylene radical having from 1 to about 6 carbon atoms or a non-substituted alkyl or alkylene radical having from 1 to 6 carbon atoms; X is an anionic radical; Z is H or hydrogens or a water soluble cation or cations which together counterbalance the valence of X, and a is 0 or 1. The copolymer is effective in inhibiting the precipitation of certain scale forming salts, and also acts to inhibit corrosion of metal parts in contact with water systems.

Abstract: A process for stabilizing manganese ions in aqueous solutions is disclosed. The process comprises adding to an aqueous solution containing maganese ions a polymer or copolymer of unsaturated carboxylic compounds such as acrylic acid, methacrylic acid, polyacrylic acid and maleic anhydride and an orthophosphate. The ratio of polymer to orthophosphate is preferrably about 2 to 1.

Abstract: Gum and sediment formation in liquid hydrocarbon mediums are inhibited by adding to the medium an alkyl 1,2-dihydroquinoline compound, dimer, trimer or polymer thereof. The invention is particularly well-suited for use in hydrodesulfurizer processes wherein the hydrocarbon medium is typically a naphtha, diesel, kerosene, light gas and or residual fuel charge and the charge or medium is subjected to high temperature and pressure treatment in the presence of a catalyst.

Abstract: A process for detackifying and coagulating paint in a wet paint spray booth wherein water is used to wash the air containing oversprayed paint from the paint spray operation. The process comprises forming stable colloid solutions consisting of weakly electropositive metals. Additionally, to activate the metal cation, various anionic or cationic polymers may be selected and used.

Abstract: A composition for treatment of boiler waters is disclosed. The composition comprises a synergetic combination of a methacrylic acid-containing polymer with a strongly interacting nonionic surfactant, together with a chelant and/or a phosphate-generating species. The composition is particularly effective when the surfactant is an alkoxylated alkylphenol or an alkoxylated alkylphenol ether.

Abstract: Methods of using novel water soluble polymers to inhibit corrosion and control the formation and deposition of scale imparting compounds in boiler water systems are disclosed. The polymers are comprised of repeat units formed from .gamma., .beta. ethylenically unsaturated compounds, and repeat units formed from allylalkylene ether monomers.

Abstract: Methods and compositions are provided for inhibiting the polymerization of styrene monomer during elevated temperature processing thereof or during storage or shipment of styrene containing product. The compositions comprise a combination of (a) a phenylenediamine compound having at least one N-H bond and (b) a hindered phenol compound. The methods comprise adding from 1-10,000 ppm of the combination to the styrene medium, per one million parts of styrene.

Abstract: Methods for controlling the formation of proteinaceous fouling deposits in high temperature evaporators and concentrators as employed in processing steepwater in the wet milling of corn. The methods comprise adding a surfactant, preferably a nonionic surfactant to the steepwater. Particularly effective surfactants are oxyalkylated sorbitan R surfactants where R is monooleate, trioleate, monostearate, tristearate, monopalmitate and monolaurate.

Abstract: Calcium phosphate scale control methods and compositions are disclosed. Water soluble acrylic acid/monohydroxylated alkyl allyl ether copolymers are used.

Abstract: New composition of monomers and polymers and their methods of use are disclosed. The polymers are water soluble and are composed of repeat units formed from an ethylenically unsaturated compound, and repeat units formed from substituted allyloxy alkylenes.

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: 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: A chromate and phosphate free composition and method for forming a dried in place conversion coating for aluminum and aluminum alloys. The method entails the application of the composition to aluminum or aluminum alloys and allowing the composition to dry in place. The composition is an acidic aqueous solution preferably containing more than 8 grams per liter dihydro-hexafluozirconaic acid, more than 10 grams per liter polyacrylic acid and more than 0.17 grams per liter hydrofluoric acid in a ratio of 1:0.84:0.014. The solution forms a dried in place conversion coating having a weight of from 6 to 25 milligrams per square foot in treatment (contact and drying) times as short as 2 seconds.

Abstract: Method and composition for sealing of a phosphate conversion coating is disclosed. The method includes contacting a phosphate conversion coating with an acidic aqueous solution of substituted iminodimethylene diphosphonic acids represented, as a class, by the formula R1--N--(CH.sub.2 --PO.sub.3 H.sub.2).sub.2 where R1 is a Z, alkyl or aryl moiety having a carbon chain up to the length where solubility in an acidic aqueous solution is lost. Z is ##STR1## where R2 and R3 are hydrogen, alkyl, aryl, or phosphono alkyl moieties, m is from 1 to 3 and Cn is a methylene carbon chain up to the length where solubility in an acidic aqueous solution is lost, and water soluble salts thereof. Preferably, R1 is methyl through octyl, benzyl, or diethylenediaminotrimethylene triphosphonic acid. The substituted iminodimethylene diphosphonic acid is applied as an aqueous bath with a pH of from about 3.3 to 4.0. The substituted iminodimethylene diphosphonic acid may dry in place or be followed by a deionized water rinse.