“…Process development, and especially conceptual design, is regarded as the most important design stage since the major decisions affecting the entire lifecycle of the process are made then (Tuomaala et al, 2000). Tuomaala et al (2000) stated that the criteria affecting the plant performance could be classified into three categories: 1) economy and profitability 2) safety-health-environment (SHE) 3) technological criteria…”