Any technological process, through his specific, generates pollution in the environment, which ultimately has both short term but mainly long-term, harmful effects on human health. Today, when the technological degree is high in almost all areas of activity, it is impossible to completely avoid damage to the environment caused by the impact of technological processes, but it is possible to find some actions, having an effect towards reducing the negative impact in the sense of obtaining clean technology. Cleaner technology is, on the one side a goal pursued at international, european and national level, and on the other hand is a concept that covers many aspects of both the actual economic activities and of the environmental protection. This paper aims is on the one hand, to show how a tehnological process should be analyzed by highlighting the relationships between elements of the industrial process, according to some scheme, precisely in order to obtain so-called �clean technologies and on the other hand in the specific case of chemical pollution, to present most used evolutionary models on a chemical production forecast.