国内过氧化氢装置中氧化塔多数采用内冷式的空塔,由于塔内设置了多段冷却器

Most of the oxidation towers in domestic hydrogen peroxide installations use internally cooled empty towers. Since the tower is equipped with a multi-stage cooler, which occupies the effective space in the tower, in order to ensure that the hydrogenated liquid has sufficient residence time in the tower, the tower will be enlarged. Diameter or height. For large-scale hydrogen peroxide plants, the structural design of the oxidation tower is difficult to achieve. More importantly, due to the existence of the multi-stage cooler in the tower, it is easy to form a temperature gradient in the tower, so that the diffusion rate of the reactants from the inside of the solution to the interface and the diffusion rate of oxygen from the air to the interface cannot be balanced, thus destroying the liquid phase. Oxidation reaction. For the empty tower oxidation tower, air is required to be evenly distributed in the liquid phase in the tower to achieve full gas-liquid mixing to achieve the purpose of ideal diffusion and mass transfer. However, there is a cooler, so that the fluid velocity between the tubes and the fluid velocity not between the tubes are not equal, which affects the full mixing of the gas and liquid phases in the tower, even if the degree of dispersion of the air distributor at the bottom of the tower is better, within 8m The ideal distribution can be achieved. The air gradually forms large bubbles above 8m, and the gas is easy to form a short circuit, which affects the full mixing of the gas and liquid phases and enhances the strength of the liquid phase oxidation reaction.

Most of the domestic hydrogen peroxide devices in the use of internal cold-type empty tower, because the tower set up a multi-segment cooler, occupy the effective space in the tower, in order to ensure that hydrogenated liquid in the tower has sufficient stay time, will increase the diameter or height of the tower. For large hydrogen peroxide devices, the oxidation tower is difficult to do in structural design. More importantly, due to the existence of multi-segment coolers in the tower, it is easy to form a temperature gradient in the tower, so that the reaction from the inside of the solution to the interface diffusion speed and oxygen from the air to the interface can not maintain a balance, thus destroying the liquid phase oxidation reaction. For the empty tower oxidation tower requires air to be evenly distributed in the tank in the liquid phase in order to achieve the full mixing of gas liquid to achieve the ideal diffusion mass transfer purposes. However, there is a cooler, so that the fluid speed between the tubes and not between the tube fluid velocity is not equal affected by the full mixing of gas liquid two phases in the tower, even if the dispersion of the air distributor at the bottom of the tower is better, within 8m can achieve the ideal distribution, air above 8m gradually formed atmospheric bubbles, gas easy to form short circuits, which affects the full mixing of gas liquid two phases, enhance the strength of the destruction liquid phase oxidation reaction.

Most of the oxidation towers in domestic hydrogen peroxide plants are empty towers with internal cooling. Due to the multi-stage coolers in the tower, the effective space in the tower is occupied. In order to ensure the sufficient residence time of hydrogenated liquid in the tower, the diameter or height of the tower will be increased. For a large hydrogen peroxide plant, it is difficult to design the structure of the oxidation tower. More importantly, due to the existence of multi-stage cooler in the tower, it is easy to form a temperature gradient in the tower, so that the diffusion rate of reactants from the solution to the interface can not keep balance with that of oxygen from the air to the interface, thus destroying the liquid phase oxidation reaction. For the empty tower oxidation tower, the air is required to be evenly distributed in the liquid phase in order to achieve the purpose of gas-liquid full mixing to achieve the ideal diffusion mass transfer. However, the existence of cooler makes the fluid velocity between tubes and that not between tubes unequal, which affects the full mixing of gas-liquid two phases in the tower. Even if the dispersion degree of air distributor at the bottom of the tower is better, the ideal distribution can be achieved within 8m. The air above 8m gradually forms large bubbles, and the gas is easy to form short circuit, which affects the full mixing of gas-liquid two phases, The destruction of liquid phase oxidation reaction is enhanced.<br>