Abstract: A process of producing chlorine gas by catalytic oxidation of hydrogen chloride including: incorporating an oxidizing agent such as ozone, hydrogen peroxide solution etc.

Abstract: A method including obtaining a plurality of user reviews of different commercial products or services. The user reviews include statements about features of the products or services. The method also includes assigning a sentiment orientation to each of a plurality of the statements. The sentiment orientation indicates whether the statement reflects a positive sentiment or a negative sentiment. At least one of the features is a common feature that is shared by a plurality of the products or services. The method also includes ranking the products or services having the common feature relative to one another based on the sentiment orientations of the common feature.