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Production of soda ash using the ammonia method belongs to the class of complex continuous chemical-technological systems and is characterized by multidimensionality, inertia, the existence of cycles of material flows, complex dependences between the input and output parameters of technological modes. The research into the operation of this production and its performance indicators revealed that 24–26 % of losses in soda ash production were caused by violations of the technological mode at the absorption-distillation department. Many of these violations can be prevented, and losses can be significantly reduced, by developing a system of diagnosing the state of technological processes at this department. The main task of the diagnosing system at the absorption-distillation department is to determine the moment of transition of the technological process to the emergency state, disabling the control system, informing a technologist-operator about the probable cause of the emergency, and giving recommendations for its elimination. After the elimination of the reasons for the deviation of the technological process from normal functioning, the measures on switching on the control system are taken. The system of diagnosing an absorption-distillation department of soda ash production should be implemented based on the passive observations of the course of the technological process. This is due to the continuity of production, on the one hand, and the requirement to adhere to the mode of the normal functioning of the technological process, on the other hand. The results of the analysis of diagnosing emergencies prove that the implementation of the method of logical decision tables will enhance the speed of the diagnosing process and improve its quality due to the prevention and timely liquidation of emergencies. It was established that if the same emergency analysis vector corresponds to different causes of emergencies in this system, it is necessary to use characteristics of the statistical theory of solutions.

This article discusses the control of the carbonization department of the production of producing calcinated soda by ammonia method. Analyzing information sources, as well as studies, stationary modes of the carbonization column were described. A study of stationary modes was carried out to decide on the appropriateness of their use for the separation of carbonization.

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