Hydrogenation reaction ammonium salt crystallization prevention device

Abstract

A hydrogenation reaction ammonium salt crystallization prevention device specifically includes a reaction furnace, a refining reactor, heat exchangers, a new hydrogen inlet, a raw oil inlet, water injection points and a water injection line, and is characterized in that: the four heat exchangers are in series connection, the reaction furnace and the refining reactor are in series connection, three stages of water injection points are arranged in front of the heat exchangers, and are in series connection, and according to the demand, the water injection points are intermittently used, the water injection points are replaced by E-2101A / B outlet for water injection, device circulating volume can be restored to normal, and the system pressure drop is decreased significantly. By adjusting of the water injection point temperature between ammonium salt crystallization point and water dew point temperature adjusting of the water injection flow of water injection points 1 and 2 according to the flow, the heat exchange effect can achieve the best state, and solid ammonium salt crystallization can be eliminated. The hydrogenation reaction ammonium salt crystallization prevention device solves the problem of low temperature part ammonium salt crystallization in the reaction system, improves the heat exchange efficiency, reduces the load of a heating furnace, and increases the output of the product.

Description

1. Technical field [0001] The invention relates to petrochemical industry, in particular to an anti-ammonium salt crystallization device in hydrogenation reaction. 2. Background technology [0002] During the diesel hydrogenation process, ammonium salts will be precipitated in the reaction system. These ammonium salts not only affect the heat exchange effect, but also block the pipeline, causing the pressure drop of the system to rise, which is not conducive to the safe operation of the device. The ammonium salt precipitated by the reaction product includes two types, one is NH 4 The crystallization temperature of Cl is 180-200°C, the other is NH 4 The crystallization temperature of HS is 150°C. Because the crystallization temperature is different, the parts that precipitate in the system are different. NH 4 Cl is generally precipitated at the last heat exchanger, while NH 4 HS is generally precipitated in high-pressure air-cooled places. As the market changes and the ...

AI Technical Summary

Problems solved by technology

As the market changes and the raw materials are changing day by day, the problem of ammonium salt crystallization in the low temperature part of the reaction system is prominent, which not only leads to an increase in the pressure drop of the system, but also reduces the heat exchange efficiency

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