What are the reasons for the sticky wall of stainless steel reactor? About this problem, as a second-hand reactor manufacturer in Liangshan recycling, let Xiaobian take you to learn about it!
When the temperature, pressure and other glue making process indicators are not stable or fluctuate too much, the resin condensation reaction process is uneven, which is easy to cause sticky wall. Therefore, in the production, it should be slowly pressurized and heated. Generally, the water steam of about 0.15Mpa is kept for 2 ~ 3min and then slowly raised pressure and heated up. The lifting speed should be 0.1-0.15mpa per minute.
If ammonia chloride is used as a catalyst, due to the fast reaction speed of ammonia chloride, the PH value can not be shown, and after the temperature rises, the PH value decreases rapidly, the reaction speed is accelerated, and the condensation reaction is too intense, resulting in gel and sticky wall.
Due to the high sulfate content in urea, when urea is added in the later stage of the resin polycondensation reaction, it is equivalent to adding a curing agent to promote the resin to quickly cross-link into a network structure, if the treatment is not timely, it will make the resin solidified in the reactor, therefore, in the production should choose standard industrial urea raw materials, Limit the sulfate content of urea to less than 0.0001.
Fourth, the temperature difference of the kettle wall cooling medium temperature is too low or suddenly cooling, so that the temperature difference between the kettle wall temperature and the material is too large, resulting in contact with the reaction kettle wall glue wall. Therefore, both heating and cooling should be carried out within a reasonable temperature difference range, usually the steam use 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. At the same time, it should be noted that the appropriate inlet and outlet temperatures of the cooling medium are determined to maintain operational balance.
