The stainless steel reactor is prone to sticking to the wall when it is in use. The importedion exchange systemwill affect the normal operation of the equipment if the time is too long. Therefore, we must understand the factors before solving the problem. Let me introduce the equipment to you. The process factors of sticking wall:
1. The temperature difference of the kettle wall
①The 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 wall of the stainless steel reactor to stick to the wall.
② Both heating and cooling should be carried out within a reasonable temperature difference range. Generally, the steam temperature should be less than 180℃, the thermal shock of the temperature difference should be less than 120℃, and the cooling shock should be less than 90℃.
③ Pay attention to determine the appropriate cooling medium inlet and outlet temperatures to maintain balanced operation.
2. Balance of operation
① Therefore, in the production operation, the pressure should be slowly increased and the temperature should be raised.
② When the temperature, pressure and other glue-making process indicators are unstable or fluctuated too much, the polycondensation reaction process of the resin is uneven, which is easy to cause sticking to the wall.
③ Generally, the water vapor of about 0.15Mpa is passed in for 2-3 minutes, and then the pressure is gradually increased and the temperature is raised. The lifting speed is preferably 0.1-0.15Mpa per minute.
3. Raw material factors
①Because the sulfate content in urea is too high, when urea is added in the late stage of the polycondensation reaction of the resin, it is equivalent to adding a curing agent to promote the rapid cross-linking of the resin into a network structure. If the treatment is not timely, the resin will be cured in the reaction. inside the kettle.
② Therefore, standard industrial urea raw materials should be used in production, so that the sulfate content in urea is hindered below 0.01%.
4. Reaction temperature and time
①Generally, the temperature of the reaction solution should be controlled within 0～95℃.
②The polycondensation reaction time is too long, the molecular weight of the resin is large, and the viscosity is too high, and the phenomenon of sticking to the wall is easy to occur. Therefore, the temperature and time of the polycondensation reaction should be correctly controlled during operation, and the reaction should be terminated in time.
③When the temperature of the reaction solution is lower than 80℃, if ammonium chloride is used as a catalyst, the pH value cannot be displayed due to the fast reaction speed of ammonia chloride. After the temperature rises, the pH value drops rapidly, the reaction speed is accelerated, and the polycondensation reaction is too high. Intense resulting in a gel and the appearance of a sticky wall.
Once the stainless steel reaction kettle sticks to the wall, it means that there is a problem with our equipment, but as long as we use the correct operation method, the above factors can be avoided, so that the normal operation of the equipment will not be affected. In addition, daily maintenance is also very important.