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Reaction sequence and temperature rise of the reaction vessel
Oct 13, 2018

The reaction vessel strictly monitors and controls the temperature, pressure, material composition and feeding sequence in the reaction vessel according to its regulations, so that the reaction can be kept normal, and the reaction vessel can add a trace inhibitor to the raw material gas to partially poison the catalyst. The upper part of the reaction tube near the inlet of the raw material gas is placed with a catalyst diluted by an inert carrier or a partially aged catalyst, and a staged cooling method is employed to increase the heat exchange rate.


The cooling pipe provided in the reaction vessel should have a sufficient cooling area, so as to ensure continuous supply of the coolant having a stable parameter, and at the same time, the reaction temperature can be finely adjusted by the preheating temperature of the raw material gas. The feeding speed is controlled, the double valve is used to control the feeding of the nitrating agent, and the solid material is prohibited from being put into large pieces. The reddish brown oxidizing nitrogen gas appears in the nitrification process, which is a sign that the temperature rise may cause danger, and the feeding is stopped immediately, and the nitration reactor is stopped. It should be equipped with a cooling water source backup system, the materials are evenly mixed, and the reactor should be stirred with an automatic starting backup power supply, with auxiliary facilities for protective gas mixing or manual mixing.


When the reaction vessel is reacted, it can be accurately fed according to the order of its feeding and the ratio of feed ratio. The total material should not exceed the amount, and the temperature should be prevented from rising too fast in the early stage of the reaction. When the reaction is accelerated, the heat release is gradually increased. Cooling and cooling, in the process of the reaction, it is necessary to pay attention to the temperature and pressure change. The polymerization heat is large. It is not enough to increase the size of the reactor to obtain more jacket and tongue tube cooling area. Or the solvent vaporization reflux brings out the heat of reaction, after condensing or compressing and liquefying, and then returning to the polymerization tank for heat absorption.

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