The instant invention is directed to an admixture, and its use in inhibiting scale and corrosion in aqueous systems, comprising: (a) a water-soluble polymer having a weight average molecular weight of less than 25,000, as determined by low angle laser light scattering, comprising an unsaturated carboxylic acid and an unsaturated sulfonic acid, or their salts, having a ratio of 1:20 to 20:1, and (b) at least one compound selected from the group consisting of water-soluble polycarboxylates, phosphonates, phosphates, polyphosphates, metal salts and sulfonates. The instant invention is also directed to a method of inhibiting the formation of insoluble alluvial, metal oxide and metal hydroxide deposits in an aqueous system, comprising adding to the system at least 0.1 mg/l of a water-soluble polymer having a weight average molecular weight of less than 25,000, as determined by low angle laser light scattering, comprising an unsaturated carboxylic acid and an unsaturated sulfonic acid, or their salts, having a ratio of 1:20 to 20:1 and a phosphonate.

Synergistic scale and corrosion inhibiting admixtures containing carboxylic acid/sulfonic acid polymers

A method for inhibiting the plugging of a conduit by gas hydrates comprises adding to a mixture of water and hydrocarbons flowing through the conduit an amount of a hydrate formation inhibitor component of formula (a), wherein two of R1-R4 are independently normal or branched alkyls having 4 or 5 carbon atoms, two of R1-R4 are independently representing organic moieties having at least 8 carbon atoms, A represents a nitrogen or phosphorus atom, and Y represents an anion.

Method for inhibiting the plugging of conduits by gas hydrates

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.

Water treatment polymers and methods of use thereof

The instant invention relates to the use of water-soluble polymers comprising structural elements of formula (I) wherein each R is independently H or C1-5-alkyl; X is H, an alkaline or earth alkaline metal or a quaternary ammonium group; R1 is H or C1-18-alkyl; and R2 is C1-18-alkyl; and wherein the alkyl groups represented by R1 and R2 may carry a hydroxy or amino substituent; and, if desired, a minor proportion of structural elements of formula (II) wherein R, R1, R2 and X may have the meaning as above, and Alk is a C1-C5-alkylene chain, as additives for inhibiting the formation of gas hydrates in connection with hydrocarbon production and transportation.

Additives for inhibiting gas hydrate formation

A method of treating an aqueous system is disclosed which comprises adding thereto a water-soluble zinc salt, a chelant and either a product containing at least one phosphorous-containing acid group and at least one carboxylic acid group or an acrylic, vinyl or allyl carboxylic acid polymer.

Treatment of aqueous systems

A method of inhibiting corrosion and scale formation in an aqueous system is disclosed which comprises the step of treating the said system with 0.1 to 500 parts per million by weight of the total aqueous content of the said system, of a composition which may additionally include zinc and which comprises a polymer selected from the group consisting of: Polymers having recurring units of the formula: ##EQU1## WHEREIN M + may be H + , alkali metal cation, or quaternary ammonium cation of the formula: ##EQU2## wherein for all of the above formulas, R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are each independently selected from the group consisting of hydrogen, alkyl of from one to 10 carbon atoms, and substituted alkyl of from one to 10 carbon atoms, where the substituent is hydroxyl; carbonyl; and carboxylic acid groups, and alkali metal ion and ammonium salts thereof; and Wherein n is an integer of from 2 to 100; and polymers having recurring units of the formula: ##EQU3## WHEREIN R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are each independently selected from the group consisting of hydrogen, alkyl of from one to 10 carbon atoms, and substituted alkyl of from one to 10 carbon atoms, where the substituent is hydroxyl; carbonyl; and carboxylic acid groups, and alkali metal ion and ammonium salts thereof; Wherein p is an integer of from 1 to 6; Wherein m is an integer of from 2 to 100; and Wherein n is an integer of from 2 to about 100, provided that, n not equal to m, the lesser of m or n is multiplied by a factor such that n = m.

Scale inhibition and corrosion inhibition

A method of inhibiting corrosion and scale formation in an aqueous system is disclosed which comprises the step of treating the said system with 0.1 to 500 parts per million by weight of the total aqueous content of the said system, of a composition which comprises amine adducts of maleic anhydride polymers and which may additionally include zinc.

Michael M. Cook

Papers

Scale inhibition and corrosion inhibition

Corrosion inhibition with amine adducts of maleic anhydride polymers