In a autonomous decentralized chemical plant (ADChP), an unspecified number of autonomous modules should cooperate to achieve given objectives. In order to realize an ADChP, therefor the control system in the module should be designed to include communicating functions because there are no prefixed structures in the ADChP. In this paper, the authors present a communication framework for an ADChP in accordance with the autonomous decentralized systems concept. A multi-effect evaporating system is also presented as a practical application of the ADChP.