Combined desalting and anti-corrosion method of catalytic reforming device

Abstract

The invention relates to a combined desalting and anti-corrosion method of a catalytic reforming device. According to the method, a dewatering dechlorination tank (7) is additionally arranged behind a stabilizing tower feeding pressurizing pump (6); after the dewatering by the dewatering dechlorination tank, the water content is less than or equal to 15 ug / g; the chloride content is less than or equal to 0.5ug / g; a water washing desalination device (5) is additionally arranged on a tower top liquefied gas tower return backflow flow process; a great number of NH3, H2S and HCl inorganic matters are removed through the water washing desalination device (5), so that the backflow total salt content is reduced to be within 1mg / L. The long-period stable operation of the catalytic reforming device is realized.

Description

technical field [0001] The present invention relates to a combined desalting and anti-corrosion method for a catalytic reforming unit, in particular to a combined desalting and anti-corrosion method for a stabilization tower (or depentanizer) with serious corrosion and salt formation in a catalytic reforming unit, and The same transformation is carried out on similar towers in catalytic reforming to realize long-term stable operation of catalytic reforming units. Background technique [0002] Catalytic reforming can be used to produce high-octane gasoline blending components, aromatics, and cheap hydrogen for various hydrogenation units. As the nature of crude oil becomes heavier and worse, environmental protection requirements continue to increase, the catalytic reforming process has encountered good development prospects, and the processing scale has gradually expanded. [0003] The liquid product of the catalytic reforming reaction is sent to the stabilizing tower (or de...

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Problems solved by technology

However, the water injection extraction efficiency is not high, and inorganic salt impurities cannot be efficiently removed; the hydrocarbons returned to the tower after water cutting are easy to bring liquid water into the bottom of the tower; at the same time, the cut water entrains hydrocarbons, resulting in difficulties in water treatment and waste of hydrocarbons

[0016] It is also common to inject water at the feed of the tower. Although it can temporarily solve the problem of salt accumulation on the top of the tower, the injection of water into the feed will aggravate the chlorine corrosion of the equipment, which is not a perfect treatment method.

None of the above methods are ideal

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