Method of estimating the properties of a polymer product

A method of monitoring the state of process comprising:

• incorporating residence time distribution to process variables, wherein said method comprises theoretically determining amounts of content and discharge of a product in the process;
• incorporating the residence time distribution to the process variables by solving balance equations of a hypothetical substance by taking the respective process variables of the hypothetical substance;
• and
• monitoring the state of process therein by inputting to various process-state-monitoring models cPV's in one or more reactors by stage with respect to a final product after incorporating the residence time distribution to said process variables.

A method of controlling the properties of a polymer product comprising:

• computing average operational conditions appropriate for optimum operation of a polymer product per lot or batch by using a method of estimating the properties of a polymer product comprising:
• computing converted process variables (cPV's) wherein converted process variables comprise process variables that a final product or an intermediate product experienced earlier in average in one or more reactors by stage with respect to the final product by incorporating the residence time distribution to process variables by means of theoretically determining amounts of content and discharge of the product in the process;
• solving balance equations of a hypothetical substance by taking the respective process variables of the hypothetical substance;
• and
• estimating the properties of the product by inputting to various property estimation models cPV's in one or more of the reactors by stage with respect to the final product after incorporating the residence time distribution to the process variables;
• and
• utilizing the same in quality control of the polymer product.

A method of controlling the properties of a polymer product comprising:

• computing the average operational conditions appropriate for optimum operation of the polymer product per lot or batch by using a method of monitoring the state of process comprising:
• theoretically determining amounts of content and discharge of the product in the process;
• incorporating residence time distribution into process variables by solving balance equations of a hypothetical substance by taking respective process variables as those of the hypothetical substance;
• and
• monitoring the state of process therein by inputting to various process-state-monitoring models cPV's in one or more reactors by stage with respect to the final product after incorporating the residence time distribution to said process variables;
• and
• utilizing the same in quality control of the polymer product.