Method and system for the control of a plant for the continuous production of a polymer

A method for the control of a plant for the production in continuous of a polymer, wherein said plant comprises a reaction section comprising at least one reactor fed with at least a first monomer and a second monomer, a stripping section comprising a first high-pressure stripper, a second low-pressure stripper, a third low-pressure stripper, a finishing section comprising at least one recycling vat of the fine products, a plurality of measurement equipment of the operational conditions of said plant and a control system comprising a plurality of distributed control devices controlled by at least one electronic processing and control unit on the basis of a plurality of control variables comprising at least the oil flow-rate for feeding said first stripper, and the flow-rate of chain terminator for feeding said at least one reactor, and the vent flow-rate of a thermostatic circuit of said at least one reactor, said plurality of control variables being calculated by a plurality of calculation modules, said control method comprising:

• collecting a plurality of data, comprising recipe parameters, results of laboratory analyses and predefined coefficients stored in databases;
• collecting the data measured by said measurement equipment;
• determining, by a first calculation module of said plurality of calculation modules, a production potentiality value of said at least one reactor on the basis of said recipe parameters, said laboratory analysis results, said predefined coefficients and said data measured by said measurement equipment;
• determining, by a second calculation module of said plurality of calculation modules, the polymer concentration in said at least one reactor, in said first stripper and in said at least one recycling vat of the end products, based on the production potentiality value of the at least one reactor determined by said first calculation module, said recipe parameters, said laboratory analysis results, said predefined coefficients and said data measured by said measurement equipment;
• determining, by a third calculation module of said plurality of calculation modules, said oil flow-rate for feeding said second stripper, in order to obtain a weight percentage fraction of oil equal to a respective recipe parameter called target weight percentage fraction of oil on the basis of said production potentiality value of the at least one reactor determined by said first calculation module, of the concentration value of the polymer in the first stripper determined by the second calculation module, said recipe parameters, said laboratory analysis results, said predefined coefficients and said data measured by the measurement equipment;
• determining, by a fourth calculation module of said plurality of calculation modules, the flow-rate of the chain terminator (TERM) for feeding said at least one reactor, in order to obtain a substantially constant viscosity value of the polymer and equal to a respective recipe parameter called target viscosity of the polymer, and a TERM molar percentage fraction value equal to a respective recipe parameter called target TERM molar percentage fraction, based on the production potentiality value of said at least one reactor determined by said first calculation module, said recipe parameters, said laboratory analysis results, said predefined coefficients and said data measured by the measurement equipment;
• controlling said plant on the basis of said plurality of control variables determined.