Process of chlorination of benzene in catalytic-distillation column with vapor diffluence - Calculation of pressure drop of beds and ratio of vapor diffluence

According to the fact that the direct load of the small particle catalyst in commercial scale catalytic-distillation tower results in remarkable pressure drop which makes operation infeasible, an idea is put forth that part of the benzene vapor rising from the tower bottom can shunt through bypass instead of passing through the catalyst beds because the bed pressure drop is directly proportional to the square of flow rate. But, in this way, the catalyst beds were of the mere catalysis and the great decline of separation function is made, which makes chlorobenzene selectivity lower. There was a suitable flow distribution ratio between the bed and the bypass. A kind of catalytic-distillation experiment equipment of the new idea mentioned above was designed. The pressure drop of the beds in the equipment was measured. Different flow distribution ratios between the beds and the bypass and the lower proportion of the bed pressure drop under different packing modes of catalyst were calculated. When the vapor diffluence proportion was 58.4%, 37.9% and 27.8%, the corresponding lowered proportion of the bed pressure drop was 57.25%, 40.68% and 32.25% respectively. The value of pressure drop in a commercial scale catalytic-distillation tower was also estimated.