Slurry loop reactor polymerization rate and quality controller

A system for maintaining polymerization production in a loop polymerization reactor, comprising:

• a loop polymerization reactor having hardware associated with modifying reaction parameters including at least monomer concentration, catalyst feed rate and reactor temperature;
• a digital control system having an executable multivariable reaction rate controller program (RRC) stored therein, which controls the hardware associated with modifying the reaction parameters;
• wherein the RRC:
• continuously and periodically receives and stores polymerization results comprising at least melt index (MI), production rate and ash content on one or more polymerized monomers;
• determines whether each of the polymerization results is within predetermined target ranges for those results;
• stores recently obtained polymerization results in a computer readable database within the RRC, and averages the recently obtained results with previously stored results;
• and
• when at least one of the polymerization results is out-of-range with respect to its predetermined target range, the RRC modifies at least one reaction parameter set-point comprising monomer concentration, catalyst feed rate or reactor temperature by controlling the associated hardware for modifying reaction parameters to drive any out-of-range polymerization result(s) toward the predetermined target range for that result.