“化学工程学”又称“化工过程”(Process)，它的理论基础一直被限定为“三传一反”. 20世纪80年代末，我曾基于活体细胞生物反应提出新“四传一反”原理，90年代郭慕孙先生提出“三传一反+X”新观点. 近20年来，我从“酸碱联产”新“化工单元”出发，发现“单元操作”与“Process”有着层次上的本质差别. 研究发现Process的理论基础是“多相动力学封闭系统”，是非平衡热力学中的第三类“熵致有序”结构，“三传一反”只是单元操作内的唯象理论. 在此基础上形成了应用范围更广的“生态循环工程学”，是“生态循环经济”技术与理论的完备基础.

Chemical Engineering or Chemical Technology Process has acquired an over-expanding knowledge base involving transport and reaction as its main contents, that is popular name “3-Tranfer & 1-Reaction”, as the principle of “unit operation” design. In last twenty years we study the acid–alkali united production from metallic salts by hydrolytic action, and found that there be an essential distinction between unit operation and process. One process contains varied many unit operations. Also the essential basic theory for process is closed circular system of multi-phases dynamics. On the basic theory of process guided the ecologic recycle engineering, as the complete base of ecological circular economy at practice or theory.