Method for oxidizing ammonium sulfite solution by micro-fluid

Abstract

The invention discloses a method for oxidizing an ammonium sulfite solution by micro-fluid. The method comprises the following steps of: ventilating the oxygen gas containing flow and the ammonium sulfite solution to a micro reactor by adopting oxygen gas-containing flow as gaseous phase and the ammonium sulfite solution as liquid phase, respectively; generating an ammonium sulfate solution by enabling the two phases for oxidation reaction at 40 DEG C to 80 DEG C; and collecting the product at the outlet of the micro reactor and completing the oxidization to the ammonium sulfite solution. According to the method disclosed by the invention, the high-concentration ammonium sulfite solution can be oxidized within a few minutes, wherein the oxidization rate is 80%-95%; and the catalyst is not added, so that the product purity is improved and the cost is reduced. The micro reactor can be used for precisely adjusting the reaction material proportion and sufficiently mixing the reaction materials; the reaction micro tube has an ultrahigh specific surface area and controllable fluidity, so that the reaction temperature and the reaction time can be controlled. Therefore, the reaction time is shortened, and the phenomenon that the oxygenation efficiency is quickly reduced due to high ammonium sulfate concentration in the traditional reaction, and the ph value of the solution is needed to be regulated at any time is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and environmental protection, and in particular relates to a method for forced oxidation of ammonium sulfite liquid. Background technique [0002] Industrial ammonia desulfurization is to remove SO in industrial waste gas 2 Absorb to generate ammonium sulfite, and then further produce ammonium sulfate. Efficient and economical conversion of higher concentration ammonium sulfite to ammonium sulfate is the key to the industrialization of ammonia desulfurization process test. [0003] Microreactor is a new type of reactor, because the physical size of its effective channels or chambers is reduced to the micron or even nanometer level, the gradient of fluid physical quantities such as temperature, pressure, concentration and density increases sharply, resulting in the promotion of heat and mass transfer. A large increase in force can increase the heat transfer coefficient by an order of...

AI Technical Summary

Problems solved by technology

Long reaction time and low oxidation rate limit the promotion of ammonia desulfurization method

In order to increase the oxidation rate, some catalysts are used to catalyze the oxidation, but the catalyst is generally expensive, which not only increases the cost, but also makes the product contain a small amount of catalyst, resulting in impure products.