CDI issues
Thread Content
In hydrogen adsorption, how often should activated carbon be replaced? What consequences can excessively high levels of trichlorosilane have on adsorption?
Reply to 1# naihuhu: The designed service life of the activated carbon in our factory is around ten years, but it also depends on specific circumstances; this can increase the load on the adsorption columns and affect the quality of the hydrogen recovered
What consequences can excessively high levels of trichlorosilane have on adsorption? Answer: An excessive level of trichlorosilane requires frequent regeneration of the activated carbon in order to maintain the quality of hydrogen; furthermore, it also affects the service life of the activated carbon
The activated carbon manufacturer provides a ten-year warranty; too much trichlorosilane affects the adsorption efficiency, resulting in low hydrogen purity
Reply to 2# wrn1115: What causes the carbon activation column to be inverted? Will this kind of problem occur frequently?
Reply to 3# liuzhts: Does hydrogen chloride have a significant impact on the adsorption efficiency of activated carbon?
Reply to 4# liusuibian: What causes the carbon filter column to be reversed? Will this kind of problem occur frequently?
The adsorption part at the front, as well as the portion related to leading the process, wasn’t handled properly; under normal production conditions, Mars C can be used for a long time
You want to know how often the tower needs to be replaced. The frequency of tower replacement is determined by two factors: 1) How long the activated carbon can retain substances; in general, applications leave some margin for this purpose, but in the current situation that margin is not sufficient. 2) The purification time – it takes a certain amount of time under low pressure to remove hydrogen chloride and chlorosilanes that have been absorbed in the tower. In actual operation, the adsorption time and purification time are determined by the program; if it seems that the tower is not clean, the only options are to increase the backwashing volume or modify the program (which is not recommended).
An excess of trichlorosilane can make it difficult to raise the temperature of the tower, affecting the proper operation of the process. Additionally, since it is harder to remove, it consumes more of the activated carbon available for adsorbing hydrogen chloride, resulting in a reduced adsorption efficiency
Reply to 9# Windless: If testing is carried out intermittently at the beginning, the chlorine silane content in the exhaust gases will definitely be high; in such a case, the performance of the activated carbon shouldn’t decline that quickly, right? Will it pose certain difficulties for backblowing? If the content is very high, is it not necessary to modify the program control?