How to avoid wall sticking phenomenon in glass lined reactor


The glass lined reactor is prone to sticking to the wall when it is used, which not only affects the work, but also affects the performance of the equipment. Therefore, you must pay attention to some matters during operation to reduce the occurrence of this phenomenon. How to avoid this phenomenon:

   1. The degree of balance of operation

   When the temperature, pressure and other parameters of the glue making process are unstable or fluctuate too much, the resin polycondensation reaction process of the glass lined reactor is uneven, which is easy to cause wall sticking. Therefore, in the production operation, the pressure and temperature should be slowly increased. Generally, about 0.15Mpa of water vapor is passed in and kept for 2 to 3 minutes, and then the pressure is increased slowly. The proper lifting speed is 0.1~0.15Mpa per minute.

  2, raw material factors

Because the sulfate content in urea is too high, urea will be added in the later stage. If it is not processed in time, the resin will solidify in the reactor. Therefore, standard industrial urea raw materials should be used in the production to make the sulfuric acid in urea The salt content is limited to less than 0.01%.

  3, reaction temperature and time

When the temperature of the reaction solution is lower than 80°C, if ammonia chloride is used as a catalyst, the pH value will not be displayed due to the fast reaction speed of ammonia chloride. After the temperature rises, the pH value will drop rapidly, the reaction speed will increase, and the polycondensation reaction will be too high. Vigorously cause gel and sticky walls. Therefore, the temperature and time of the polycondensation reaction should be properly controlled during operation, and the reaction should be terminated in time. Generally, the temperature of the reaction liquid should be controlled within 0~95℃.

  4. The temperature difference of the wall of the glass lined reactor

   The temperature of the cooling medium is too low or the temperature drops suddenly, so that the temperature difference between the temperature of the kettle wall and the material is too large, causing the glue that contacts the glass lined reactor wall to stick to the wall. Therefore, both heating and cooling should be carried out within a reasonable temperature difference range. Generally, the steam temperature should be less than 180°C, the temperature difference thermal shock should be less than 120°C, and the cooling shock should be less than 90°C.

   These are common causes and treatment methods. They are precautions in the operation of glass lined reactors. This phenomenon can also be caused by improper maintenance and production. Therefore, the production and processing of the glass lined reactor must comply with the process and production standards, and must be used in accordance with the operating specifications.

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