Key Markets

At elevated temperatures found in many fired manufacturing processes chemicals such as fluorine, sulfur and chlorine can be released. Fluorine, chlorine and sulfur rapidly react with water to form acidic gases. Hydrogen fluoride (HF) and hydrogen chloride (HCl) like the better known SOx and NOx, are found in many high temperature process emissions. These hazardous air pollutants may come from the raw materials, additives or even the fuel.

Because acid gases will readily react with lime (CaCO3) to form inert stable products it is only natural to consider the use of limestone to clean exhaust gases containing these pollutants.

The so-called adsorption effect on the surface of limestone has been known for some time and has been further developed and optimized by Encertec. The patented construction of the adsorber's reaction area guarantees a reliable and inexpensive method to reduce acidic gases in general and especially the reduction of hydrogen fluoride.

Encertec's Success

In addition to the limestone process, Encertec has been successful using a mixture of different reagents, such as hydrated lime, trona and sodium bicarbonate, to reduce and meet the more stringent MACT standards while also lowering NOx emissions using an injection system followed by a baghouse.

There are several processes available for cleaning exhaust gases but with some the resulting waste disposal problems can be more difficult and costly than the original problem.

By using Encertec's adsorber and/or injection systems the clean air requirements of tomorrow can be realized today.