Can calcium carbonate powder slurry be used directly to absorb hydrogen chloride gas produced as a by-product of fertilizers in order to produce calcium chloride?
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Can calcium carbonate powder slurry be used directly to absorb hydrogen chloride gas produced as a by-product of fertilizers in order to produce calcium chloride? Currently, hydrogen chloride gas is absorbed using water to produce 31% hydrochloric acid; this 31% hydrochloric acid then reacts with calcium carbonate powder to yield a calcium chloride solution, from which solid calcium chloride is obtained through evaporation. The amount of water that needs to be evaporated is large, resulting in high costs for electricity and coal. In the process used by power plants for desulfurization, calcium carbonate slurry is used to absorb gaseous sulfur dioxide, producing desulfurized gypsum. There is an acid-base reaction between the calcium carbonate slurry and gaseous hydrogen chloride, and this reaction is more vigorous. Could the desulfurization process used by power plants be adapted to absorb gaseous hydrogen chloride and produce calcium chloride? In this way, there is no evaporation, so production costs can be **reduced. There are many talented people in HaiChuan – experts in technology and craftsmanship – so I’d like to hear everyone’s opinions.
In my opinion, it is quite difficult to use stone powder solution for absorption. The challenges are as follows: 1. Stone powder solution essentially consists of stone powder suspended in water, which is an insoluble substance; so what kind of equipment should be used to apply it directly to the absorption of hydrochloric acid? Conventional packed scrubber towers cannot meet the requirements for the cyclic washing of insoluble substances. 2. The issue of absorption rate: Generally, such devices operate continuously and require a fast absorption reaction rate. The reaction between limestone powder and hydrochloric acid is slow, which means that either the device needs to be larger or multiple batch operations need to be used in sequence. 2. This absorption is a different concept from the absorption in power plants. 3. In fact, ammonia water is the best for absorption.