| 摘要 |
The present invention relates to inhibition of high temperature naphthenic acid corrosion occurring in hydrocarbon processing units. The invention provides an effective novel non-polymeric and non-fouling additive for inhibiting high-temperature naphthenic acid corrosion, comprising an effective corrosion-inhibiting amount of a second phosphate ester wherein said second phosphate ester is obtained by reacting a first phosphate ester with an oxirane compound selected from the group consisting of butylene oxide, ethylene oxide, propylene oxide or any other oxirane compound or a combination thereof, preferably with butylene oxide, capably yielding said second phosphate ester, having a structure A or B,;;wherein R1 and R2 are each independently selected from the group consisting of moieties having 1 to 20 carbon atoms and R1 and R2 may be identical or different, X is H, CH3 or C2H5; and n may vary from 1 to 20,
wherein said first phosphate ester is having a structure I or II,
;;wherein R1 and R2 are each independently selected from the group consisting of moieties having 1 to 20 carbon atoms and R1 and R2 may be identical or different, said first phosphate ester being obtained as a reaction product of reaction of an alcohol with a phosphorous pentaoxide. |
| 主权项 |
1. A process for inhibiting high temperature naphthenic acid corrosion of a metallic surface of a hydrocarbon processing unit of a petrochemical plant, used for processing a stream containing naphthenic acid, with said processing units comprising distillation columns, strippers, trays, pump around piping and related equipments, and wherein the process comprises the steps of:
(a) heating said hydrocarbon containing naphthenic acid to vapourize a portion of said hydrocarbon; (b) condensing a portion of the hydrocarbon vapors, passing through said hydrocarbon processing unit, to produce a condensed distillate; (c) adding to said condensed distillate, before said condensed distillate is returned to said hydrocarbon processing unit or collected as a product, from 1 to 2000 ppm of a non-polymeric and non-fouling additive for inhibiting high-temperature naphthenic acid corrosion in a corrosion-inhibition-effective-amount to form a reaction mixture; (d) allowing said reaction mixture to contact said metallic surface of said hydrocarbon processing unit to form a protective film on said metallic surface whereby said metallic surface is inhibited against corrosion; and (e) allowing said condensed distillate to return to said hydrocarbon processing unit, or to be collected as said product,wherein said non-polymeric and non-fouling additive comprises oxide treated phosphate ester,wherein the oxide treated phosphate ester is a reaction product of a phosphate ester and an oxirane compound selected from the group consisting of butylene oxide, ethylene oxide, propylene oxide or any other oxirane compound or a combination thereof, and comprises a mixture of compounds having structural formulae A and B:wherein R1 and R2 are each independently selected from the group consisting of moieties having 1 to 20 carbon atoms, and R1 and R2 may be identical to or different from each other, X is H, CH3 or C2H5; and n may vary from 1 to 20,wherein said phosphate ester at least comprises a mixture of compounds of structural formulae I and II:wherein R1 and R2 are each independently selected from the group consisting of moieties having 1 to 20 carbon atoms, and R1 and R2 may be identical to or different from each other,wherein said phosphate ester is a reaction mixture of reacting an alcohol with a phosphorous pentaoxide. |
