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A combined desalination and anti-corrosion method for a catalytic reforming unit

A technology for catalytic reforming and desalination, which is applied in the catalytic reforming of naphtha, chemical instruments and methods, separation methods, etc., can solve the problems of low efficiency of water injection extraction, not ideal, and liquid water being brought into the bottom of the tower.

Active Publication Date: 2018-12-28
EAST CHINA UNIV OF SCI & TECH
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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

Method used

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  • A combined desalination and anti-corrosion method for a catalytic reforming unit

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Embodiment

[0053] In a 1.2 million tons / year continuous reforming unit in China, the reforming and depentane operation is extremely unstable, the pressure at the top of the tower fluctuates intermittently, and the temperature operation is not flexible. 160°C, the temperature at the bottom of the tower dropped from the normal 212±2°C to 205-208°C, and the content of C4 and C5 in the reformed oil at the bottom of the tower continued to exceed the standard. According to the method of the present invention, a dehydration and dechlorination tank is added after the feed booster pump of the depentanizer, and a high-efficiency water washing and desalination device is added on the reflux process of the liquefied gas at the top of the tower.

[0054] (1) The feed flow rate of the depentanizer tower is 110t / h, the temperature entering the tower is 147°C, the pressure at the top of the tower is 0.85MPa, and the oil flow rate at the top of the tower is 25t / h.

[0055] (2) The dehydration and dechlori...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G35/04B01D53/14B01D53/26
CPCB01D53/14B01D53/261B01D2257/2045B01D2257/304B01D2257/406C10G35/04
Inventor 杨强许萧卢浩竺嘉斌
Owner EAST CHINA UNIV OF SCI & TECH
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