HIGH-TEMPERATURE CORROSION INHIBITOR Russian patent published in 2009 - IPC C10G7/10 C10G75/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of inhibiting corrosion in oil refining processes, and is particularly aimed at inhibiting corrosion caused by naphthenic acids. The invention relates to a method of inhibiting corrosion of inner metal surfaces of equipment used in refining crude oil or high-temperature distillates, which are heated to temperature between approximately 350°F and approximately 790°F. The method involves mixing crude oil or high-temperature oil distillate with a corrosion inhibiting amount of corrosion inhibitor, which is selected from a group from (I) and (II) and their mixtures, where the said corrosion inhibitor (I) has formula: in which W, X, Y and Z are all present and can be identical or different and are separately selected from a group consisting of (OH), (COOH) and COOR₁, under the condition that, adjacent pairs of W, X, Y and Z can be selected from ; R₁ is an alky group with approximately 1 to approximately 16 carbon atoms; and Ar is an aromatic compound; and the said corrosion inhibitor (II) has formula: , in which R₂ and R₃ are COOR₅, or under the condition that, when one of R₂ and R₃ is or , then the other is either or , sufficient for formation of an anhydride group which links functional groups R₂ and R₃; each R₅ is independently selected from alkyl groups with approximately 1 to approximately 16 carbon atoms; R₄ is COOR₆, where R₆ is an alkyl group with approximately 1 to approximately 16 carbon atoms; when refining crude oil or high-temperature distillates obtained from the crude oil at high temperature, containing (I) tetrafunctional substituted aromatic compounds and (II) trimellitic acid anhydride ethers.

EFFECT: effective reduction of corrosion of metal surfaces when in contact with high-temperature crude oil.

10 cl, 6 ex