Styrene copolymers combined with metallic species in deposition inhibition
AssigneeHuntsman Petrochemical Corporation
InventorsDuy T. Nguyen, Rodney W. Parr
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Abstract
Provided herein are compositions useful for inhibiting the formation of gummy residues on equipment in processing operations which liberate tiny adhesive particles having a tendency to agglomerate into larger particles and/or films. The compositions comprise a complex or adduct formed from styrene/methacrylic acid copolymer and calcium ions. The compositions according to the invention may be added to a processing system at any point, either upstream or downstream from the location at which residues are formed. Compositions according to the invention may be applied by spray techniques.
Claims20
1) An aqueous composition of matter which consists essentially of:
- a) water;
- and
- b) the complex formed between:
- i) a copolymer component comprising a water soluble anionic form of styrene/methacrylic acid copolymer in which the copolymer has a styrene content in the range of 10.0% to 45.0% by weight based upon the total weight of the styrene/methacrylic acid copolymer, including every hundredth percentage therebetween, and wherein said copolymer component has a molecular weight in the range of 2,000 to 30,000 including every molecular weight therebetween;
- and
- ii) a metal component comprising an aqueous solution containing at least one multivalent cation selected from the group consisting of:
- calcium, magnesium, strontium, barium, nickel, copper, tin, cobalt, iron, zinc, or mixtures thereof,
- wherein the ratio of the copolymer component to the metal component is in the range of between 1:4 to 1:500 on a weight basis.
6) An aqueous composition of matter which consists essentially of:
- a) water;
- and
- b) the complex formed between:
- i) a copolymer component comprising a water soluble anionic form of styrene/methacrylic acid copolymer in which the copolymer has a molecular weight in the range of 2,000 to 30,000 including every molecular weight therebetween;
- and
- ii) a metal component comprising an aqueous solution containing at least one multivalent cation selected from the group consisting of calcium, magnesium, strontium, barium, nickel, copper, tin, cobalt, iron, zinc or mixtures thereof,
- wherein the ratio of the copolymer component to the metal component is in the range of between 1:4 to 1:500 on a weight basis.
12) An aqueous composition of matter which consists essentially of:
- a) water;
- and
- b) the complex formed between
- i) a copolymer component comprising a water soluble form anionic of styrene/methacrylic acid copolymer in which the copolymer has a styrene content in the range of 10.0% to 45.0% by weight based upon the total weight of the styrene/methacrylic acid copolymer, including every hundredth percentage therebetween;
- and
- ii) a metal component comprising an aqueous solution containing at least one multivalent cation selected from the group consisting of calcium, magnesium, strontium, barium, nickel, copper, tin, cobalt, iron, zinc, or mixtures thereof,
- wherein the ratio of the copolymer component to the metal component is in the range of between 1:4 to 1:500 on a weight basis.
16) A process for preventing deposition of pitch, resin, stickies, lignin, and other residues on processing equipment in processes in that such species are present which comprises the steps of:
- a) providing an aqueous composition of matter which comprises:
- i) a copolymer component comprising a water soluble anionic form of styrene/methacrylic acid copolymer;
- and
- ii) a metal component comprising an aqueous solution containing at least one multivalent cation selected from the group consisting of calcium, magnesium, strontium, barium, nickel, copper, tin, cobalt, iron, zinc, or mixtures thereof, and
- b) introducing an effective deposition inhibiting amount of said aqueous composition into a process stream in which pitch, resin, lignin, and other residues are liberated,
- wherein the concentration of the copolymer component of said aqueous composition in said process stream is in the range of between 0.5 parts per million to 500 parts per million by weight based upon the weight of said process stream.
Dependencies are inferred from the claim text.