I would like to ask about the dispersion of materials in highly exothermic reactions
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Dear experts, I would like to ask: in the context of exothermic reactions, how can we address the issue of ensuring uniform dispersion of two materials in engineering applications? When the two materials come into contact, they release a large amount of heat. What forms and methods are used in engineering to address the issues of uniform mixing and dispersion of these materials? Thank you
Handling highly exothermic processes is actually not difficult; there are many industrial examples, such as the dilution of concentrated sulfuric acid. The general principle is to add a small amount of one substance evenly into a large amount of another substance, in order to control the rate of heat generation so that it isn’t too fast. For instance, adding concentrated sulfuric acid drop by drop to a large amount of water can be done easily through mixing – stirring or air flow can be used for this purpose. Whether it’s a liquid-liquid mixture or a liquid-solid mixture, stirring is necessary. In the case of a gas-liquid mixture, simply using bubbles is sufficient, as this makes the process easier to carry out. The most crucial thing is to remove the heat generated by the reaction in a timely manner; this can be achieved through jacket cooling or coil cooling, or by using steam produced from high-temperature boiler water to carry away the reaction heat – there are many examples of this, such as in methanol synthesis and ammonia synthesis.
Feed is distributed circumferentially; the reaction takes place through bottom vibration or forced-air bubbling contact. A coil heat exchanger is installed, and the feed rate and air supply volume are controlled based on the reaction temperature, while the cooling water flow rate for the coil is adjusted as well