Polymer process
AssigneeRohm and Haas Company
InventorsMichael Raymond Connelly, Dennis Patrick Stack, Richard Shu-Hua Wu, Ronald Ray Zimmer
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Abstract
Disclosed is a process for controlling the level of in-process monomer in an emulsion polymerization reaction. Also disclosed is a method of controlling particle size by controlling the level of in-process monomer.
Claims10
A method of controlling particle size of an emulsion polymer including the step of controlling the amount of in-process monomer present during the polymerization reaction.
A method of controlling standing monomer level in a polymerization reaction including the steps of a) detecting coolant temperature at a cooling jacket inlet;
- b) detecting coolant temperature at a cooling jacket outlet;
- c) detecting coolant flow rate;
- d) calculating Qjdyn (raw) and Uraw wherein Uraw is capped such that Umin<Uraw<Umax;
- e) obtaining Ufilt by inputting Uraw into a low pass first order filter;
- f) calculating a value for the dynamic jacket heat removal;
- g) calculating a heat release value of polymerization using the dynamic jacket heat removal value;
- h) comparing the calculated heat release value of polymerization to a target heat release value of polymerization;
- i) calculating the level of in-process monomer in the polymerization reaction;
- and j) controlling the rate of monomer addition to the polymerization reaction such that a desired level of in-process monomer is maintained.
An apparatus for controlling standing monomer level in a polymerization reaction including:
- a) temperature detecting means for detecting coolant temperature at a cooling jacket inlet;
- b) temperature detecting means for detecting coolant temperature at a cooling jacket outlet;
- c) detecting means for detecting coolant flow rate;
- d) computing means for calculating Qjdyn (raw) and Uraw wherein Uraw is capped such that Umin<Uraw<Umax;
- e) means for obtaining Ufilt by inputting Uraw into a low pass first order filter;
- f) means for calculating a value for the dynamic jacket heat removal;
- g) means for calculating a heat release value of polymerization using the dynamic jacket heat removal value;
- h) means for calculating a difference between the calculated heat release value of polymerization and a target heat release value of polymerization;
- i) computing means for determining the level of in-process monomer in the polymerization reaction;
- and j) controlling means for controlling the rate of monomer addition to the reactor such that a desired level of in-process monomer is maintained.
Dependencies are inferred from the claim text.