A viscoelastic surfactant (VES) for a self-diverting acid under high temperature has a structural formula shown as formula (I), wherein, n is saturated hydrocarbon with 2 to 8 carbon atoms; R.sub.1 is saturated or unsaturated hydrocarbon with 18 to 28 carbon atoms; R.sub.2 and R.sub.3 are independently methyl, ethyl or hydrogen, and R.sub.2 and R.sub.3 can be the same or different; and X.sup.− is any one of Cl.sup.−, Br.sup.−, CO.sub.3.sup.2−, SO.sub.4.sup.2−, HCOO.sup.− and CH.sub.3COO.sup.−. The method for preparing the surfactant includes subjecting a fatty acid and an organic amine to acid-amine condensation to obtain an intermediate. The intermediate reacts with a metal hydride to obtain a fatty amine. Then, an acid solution is used to protonate the fatty amine to obtain an ultra-long-chain viscoelastic cationic surfactant. The present invention also provides use of the surfactant as a thickener for a self-diverting acid.

A viscoelastic surfactant (VES) for a self-diverting acid under high temperature has a structural formula shown as formula (I), wherein, n is saturated hydrocarbon with 2 to 8 carbon atoms; R.sub.1 is saturated or unsaturated hydrocarbon with 18 to 28 carbon atoms; R.sub.2 and R.sub.3 are independently methyl, ethyl or hydrogen, and R.sub.2 and R.sub.3 can be the same or different; and X.sup.− is any one of Cl.sup.−, Br.sup.−, CO.sub.3.sup.2−, SO.sub.4.sup.2−, HCOO.sup.− and CH.sub.3COO.sup.−. The method for preparing the surfactant includes subjecting a fatty acid and an organic amine to acid-amine condensation to obtain an intermediate. The intermediate reacts with a metal hydride to obtain a fatty amine. Then, an acid solution is used to protonate the fatty amine to obtain an ultra-long-chain viscoelastic cationic surfactant. The present invention also provides use of the surfactant as a thickener for a self-diverting acid.

The present invention relates to a modification polymerization initiator and a method for preparing the same, and the modification polymerization initiator includes a derived unit from a compound represented by Formula 1 and may include various functional groups in a molecule, and thus, may initiate polymerization reaction and introduce a functional group into a polymer chain at the same time. In addition, the preparation method according to the present invention may prepare the modification polymerization initiator with high purity in high yield.

The present invention relates to a modification polymerization initiator and a method for preparing the same, and the modification polymerization initiator includes a derived unit from a compound represented by Formula 1 and may include various functional groups in a molecule, and thus, may initiate polymerization reaction and introduce a functional group into a polymer chain at the same time. In addition, the preparation method according to the present invention may prepare the modification polymerization initiator with high purity in high yield.

A viscoelastic surfactant (VES) for a self-diverting acid under high temperature has a structural formula shown as formula (I), wherein, n is saturated hydrocarbon with 2 to 8 carbon atoms; R.sub.1 is saturated or unsaturated hydrocarbon with 18 to 28 carbon atoms; R.sub.2 and R.sub.3 are independently methyl, ethyl or hydrogen, and R.sub.2 and R.sub.3 can be the same or different; and X.sup.− is any one of Cl.sup.−, Br.sup.−, CO.sub.3.sup.2−, SO.sub.4.sup.2−, HCOO.sup.− and CH.sub.3COO.sup.−. The method for preparing the surfactant includes subjecting a fatty acid and an organic amine to acid-amine condensation to obtain an intermediate. The intermediate reacts with a metal hydride to obtain a fatty amine. Then, an acid solution is used to protonate the fatty amine to obtain an ultra-long-chain viscoelastic cationic surfactant. The present invention also provides use of the surfactant as a thickener for a self-diverting acid.

A viscoelastic surfactant (VES) for a self-diverting acid under high temperature has a structural formula shown as formula (I), wherein, n is saturated hydrocarbon with 2 to 8 carbon atoms; R.sub.1 is saturated or unsaturated hydrocarbon with 18 to 28 carbon atoms; R.sub.2 and R.sub.3 are independently methyl, ethyl or hydrogen, and R.sub.2 and R.sub.3 can be the same or different; and X.sup.− is any one of Cl.sup.−, Br.sup.−, CO.sub.3.sup.2−, SO.sub.4.sup.2−, HCOO.sup.− and CH.sub.3COO.sup.−. The method for preparing the surfactant includes subjecting a fatty acid and an organic amine to acid-amine condensation to obtain an intermediate. The intermediate reacts with a metal hydride to obtain a fatty amine. Then, an acid solution is used to protonate the fatty amine to obtain an ultra-long-chain viscoelastic cationic surfactant. The present invention also provides use of the surfactant as a thickener for a self-diverting acid.

Disclosed are succinimide-based compounds used in compositions and methods for inhibiting natural gas hydrate agglomerates. The succinimide-based compounds are reaction products of an alkenyl succinic anhydride and an amine or amine alcohol.

Disclosed are succinimide-based compounds used in compositions and methods for inhibiting natural gas hydrate agglomerates. The succinimide-based compounds are reaction products of an alkenyl succinic anhydride and an amine or amine alcohol.

Described herein is a fluorinated diaminoolefin of formula (I) (R.sub.f.sup.1CF.sub.2)(R.sub.f.sup.2)NCH.sub.2CH═CHCH.sub.2N(R.sub.f.sup.4)(CF.sub.2R.sub.f.sup.3) where: R.sub.f.sup.1 and R.sub.f.sup.3, are independently selected from F, a linear or branched perfluorinated alkyl group comprising 1-7 carbon atoms, or a linear or branched perfluorinated alkyl group comprising 1-7 carbon atoms comprising at least one catenated atom selected from O, N, S or combinations thereof; and R.sub.f.sup.2 and R.sub.f.sup.4 are independently selected from a linear or branched perfluorinated alkyl group comprising 1-7 carbon atoms, or a linear or branched perfluorinated alkyl group comprising 1-7 carbon atoms comprising at least one catenated atom selected from O, N, S or combinations thereof or at least one of (i) R.sub.f.sup.1CF.sub.2 and R.sub.f.sup.2 and (ii) R.sub.f.sup.3CF.sub.2 and R.sub.f.sup.4 are bonded together to form a fluorinated ring structure comprising 4-8 carbon atoms and optionally comprising at least one catenated atom selected from O, N, S or combinations thereof.

The present invention relates to a process for preparing ethyleneamines and/or alkanolamines, comprising the following steps: 1) reacting MEG with ammonia in the presence of hydrogen and an amination catalyst; 2) removing hydrogen and ammonia from the reaction output from stage 1, wherein the removal of hydrogen and ammonia in stage 2 comprises the following steps: 2-1) separating the reaction output from stage 1 into a gaseous phase comprising ammonia and hydrogen, and a liquid phase comprising ethyleneamines and/or alkanolamines, 2-2) passing the gaseous phase from stage 2-1) through one or more condensers to obtain one or more liquid phases in which ammonia has been enriched, and a gaseous phase in which hydrogen has been enriched, 2-3) contacting the gaseous phase from stage 2-2) with MEG so as to obtain a liquid phase comprising MEG and ammonia and a gaseous phase comprising hydrogen and optionally ammonia.