METHOD OF PRODUCING ALKENYLPHTHALAMIDOSUCCINIMIDES BASED ON ACYCLIC DIETHYLENETRI- AND TRIETHYLENE TETRAMINES Russian patent published in 2020 - IPC C08F8/46 C08F8/32 C08F122/40 C10M149/22 C10L1/22 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to petrochemical synthesis, in particular to a method of producing alkenylphthalamidosuccinimides based on acyclic diethylenetri- and triethylene tetramines, which can be used as anti-corrosion, detergent and dispersant additives in the composition of lubricating oils to reduce the formation of carbon deposits on the parts of internal combustion engines. Method of producing alkenylphthalamidosuccinimides involves reacting maleic anhydride with polyalphaolefin of molecular weight 600–700, or polyisobutylene with molecular weight 650–750, or with an ethylene oligomer of molecular weight 700–800, or an ethylene and propylene copolymer containing 55–60 % of propylene units, with molecular weight of 750–850. Process is carried out in the presence of an initiator first at temperature of 80–90 °C for 1.5–2 hours, then at 175–195 °C for 4–6 hours at a molar ratio of polyalphaolefin, polyisobutylene, ethylene oligomer, ethylene and propylene copolymer to maleic anhydride of 1:1–1.02. Further, the obtained alkenyl succinic anhydride is condensed in oil with N-diethylenediamino, N^'-triethylenetriaminophthalenediamide or N-diethylenediamino, N^'-triethylene triaminothaphthalide in the presence of a solvent while heating the reaction mixture first at 95–100 °C for 2 hours, then at 155–165 °C for 5–6 hours N-diethylenediamino, N^'-triethylene triaminopthalaldiamide is obtained by reacting diethylenetriamine and triethylene tetramine in molar ratio of 1:1 with terephthalic acid first at temperature of 105–110 °C for 4 hours, and then at 115–120 °C for 3 hours N-diethylenediamino, N^'-triethylene triaminothaphthalide is obtained by reacting diethylenetriamine and triethylene tetramine in molar ratio of 1:1 with carboxybenzaldehyde first at temperature of 105–110 °C for 3 hours, then at 125–130 °C for 4–6 hours.

EFFECT: invention enables to obtain alkenylphthalamido succinimides with high output and high active corrosion properties.

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