The present invention generally relates to compositions and methods for inhibiting corrosion at a surface in the production, transportation, storage, and separation of crude oil and natural gas.

The present invention generally relates to compositions and methods for inhibiting corrosion at a surface in the production, transportation, storage, and separation of crude oil and natural gas.

The present invention generally relates to compositions and methods for inhibiting corrosion at a surface in the production, transportation, storage, and separation of crude oil and natural gas.

An inhibitor composition contains alkyl thiophosphoric triamide (or a mixture of alkyl thiophosphoric triamide and dicyandiamide), dissolved in a liquid medium comprising at least one organic solvent, at least one amine stabilizer and, optionally, at least one dye and/or at least one odor masking agent, is useful in making fertilizer compositions and in a method of fertilizing target plants.

Methods and compositions for inhibiting carbonyl-based fouling of basic wash systems. The methods comprise contacting the hydrocarbon stream that is or will be subjected to such washing with water soluble or water dispersible copolymers comprising repeat units of 1) ethylenically unsaturated monomers such as acrylic acid with one or more 2) other repeat units such as alkyl acrylates, allyl ethers, ethoxylated allyl repeat units, etc. In other embodiments, a third repeat unit 3) is present and may comprise a hydrophobic moiety such as a styrene repeat unit. The compositions may be terpolymers comprising repeat units 1), 2), and 3).

Methods and compositions for inhibiting carbonyl-based fouling of basic wash systems. The methods comprise contacting the hydrocarbon stream that is or will be subjected to such washing with water soluble or water dispersible copolymers comprising repeat units of 1) ethylenically unsaturated monomers such as acrylic acid with one or more 2) other repeat units such as alkyl acrylates, allyl ethers, ethoxylated allyl repeat units, etc. In other embodiments, a third repeat unit 3) is present and may comprise a hydrophobic moiety such as a styrene repeat unit. The compositions may be terpolymers comprising repeat units 1), 2), and 3).

Disclosed is an antioxidant for a thermoplastic resin that provides an excellent oxidation-preventing effect to a thermoplastic resin and that has an excellent effect of preventing a change in color caused by nitrogen oxides. Specifically, a compound represented by any of General Formulae (2) to (4), particularly a compound in which R.sup.2 in the formulae is an alkyl group having 1 to 8 carbon atoms whose terminal on an oxygen atom side is linked with COO, is used as the antioxidant for a thermoplastic resin. Details of General Formulae (2) to (4) are as described in the description.

A stabilizer composition having low volatility and high efficiency comprising: (i.) 25.000% to 99.997% by weight of at least one dimethyltin compound of formula (CH.sub.3).sub.2Sn(S(CH.sub.2).sub.mCOOR.sub.1).sub.2 wherein R.sub.1 is a linear, branched or cyclic C.sub.10-C.sub.20 alkyl group and m is 1 or 2, optionally containing unsaturations in the form of double or triple bonds; (ii.) 0.001% to 50.000% by weight of at least one mono-methyltin compound of formula CH.sub.3Sn(S(CH.sub.2).sub.nCOOR.sub.2).sub.3 wherein R.sub.2 is a linear, branched or cyclic C.sub.10-C.sub.20 alkyl group and n is 1 or 2, optionally containing unsaturations in the form of double or triple bonds; (iii.) 0.001% to 10.000% by weight of at least one tri-methyltin compound of formula (CH.sub.3).sub.3Sn(S(CH.sub.2).sub.pCOOR.sub.3) wherein R.sub.3 is a linear, branched or cyclic C.sub.10-C.sub.20 alkyl group and p is 1 or 2, optionally containing unsaturations in the form of double or triple bonds; and (iv.) 0.001% to 15.000% by weight of at least one thioester of formula HS(CH.sub.2).sub.qCOOR.sub.4 wherein R.sub.4 is a linear, branched or cyclic C.sub.10-C.sub.20 alkyl group and q is 1 or 2, optionally containing unsaturations in the form of double or triple bonds.

A stabilizer composition having low volatility and high efficiency comprising: (i.) 25.000% to 99.997% by weight of at least one dimethyltin compound of formula (CH.sub.3).sub.2Sn(S(CH.sub.2).sub.mCOOR.sub.1).sub.2 wherein R.sub.1 is a linear, branched or cyclic C.sub.10-C.sub.20 alkyl group and m is 1 or 2, optionally containing unsaturations in the form of double or triple bonds; (ii.) 0.001% to 50.000% by weight of at least one mono-methyltin compound of formula CH.sub.3Sn(S(CH.sub.2).sub.nCOOR.sub.2).sub.3 wherein R.sub.2 is a linear, branched or cyclic C.sub.10-C.sub.20 alkyl group and n is 1 or 2, optionally containing unsaturations in the form of double or triple bonds; (iii.) 0.001% to 10.000% by weight of at least one tri-methyltin compound of formula (CH.sub.3).sub.3Sn(S(CH.sub.2).sub.pCOOR.sub.3) wherein R.sub.3 is a linear, branched or cyclic C.sub.10-C.sub.20 alkyl group and p is 1 or 2, optionally containing unsaturations in the form of double or triple bonds; and (iv.) 0.001% to 15.000% by weight of at least one thioester of formula HS(CH.sub.2).sub.qCOOR.sub.4 wherein R.sub.4 is a linear, branched or cyclic C.sub.10-C.sub.20 alkyl group and q is 1 or 2, optionally containing unsaturations in the form of double or triple bonds.

Compositions for corrosion inhibition and methods of using the same are disclosed to replace conventional corrosion inhibitors with improved performance and improved environmental profiles.