DISCUSSION AND PRACTICE OF CAUSTIC INJECTION IN CRUDE DISTILLATION UNITS

Petroleum Processing and Petrochemicals ›› 2019, Vol. 50 ›› Issue (7): 58-62.

DISCUSSION AND PRACTICE OF CAUSTIC INJECTION IN CRUDE DISTILLATION UNITS

Received:2018-11-12 Revised:2019-02-02 Online:2019-07-12 Published:2019-07-25
Contact: Yong-Feng DUAN E-mail:duanyf.lpec@sinopec.com
Supported by:

Abstract

Abstract: With the increasing proportion of poor quality crudes with high acid, high sulfur processing, corrosion has become a common problem for the world's oil refiners. The corrosion of the distillation tower overhead system of the crude distillation unit (CDU) is the most prominent issue. The advantages and disadvantages of caustic injection into CDU were discussed, including the effects of caustic injection limits, alkali brittleness of pipeline and heater tube, heat exchanger scaling and secondary processing device. Measures were proposed, including caustic dosage, injection location, injection equipment and selection of building materials, as well as related corrosion monitoring and inspection. The results of the application in domestic refineries indicated that as a traditional and effective anti-corrosion measure, the crude oil caustic injection technology has a very good effect on controlling the corrosion of the top system of CUD unit under the condition of unfavorable factors as alkali brittleness, scale formation and catalyst poisoning.

Key words: crude distillation units, tower overhead system, caustic injection, Low-temperature corrosion, chloride ion

CLC Number:

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