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US 11,952,454 B2Granted
Processes and production plants for producing polymer polyols
AssigneeCovestro LLC
InventorsRick Adkins, Jack Reese
Life of this patent
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Abstract
Processes for preparing a polymer polyol (PMPO) in which a base polyol is continuously produced in a continuous base polyol reactor, the base polyol is continuously discharged from the continuous base polyol reactor; the base polyol is continuously introduced to a continuous PMPO reactor, which is different from the continuous base polyol reactor, and PMPO is continuously removed from the PMPO reactor. Production plant configured to carry out such processes are also described.
Claims13
A process for preparing a polymer polyol (PMPO), comprising:
- a) continuously producing a base polyol having a functionality of 2 to 8 and a hydroxyl number of 10 to 1000 mg KOH/g in a continuous base polyol reactor;
- b) continuously discharging the base polyol from the continuous base polyol reactor;
- c) continuously introducing to a continuous PMPO reactor, which is different from the continuous base polyol reactor, components comprising:
- (1) the base polyol being continuously discharged from the continuous base polyol reactor;
- (2) an ethylenically unsaturated monomer,
- (3) a preformed stabilizer;
- and
- (4) a free radical initiator, to continuously produce the PMPO;
- and
- d) continuously removing the PMPO from the continuous PMPO reactor,
- wherein the base polyol is not prepared in the same reactor as the PMPO.
8 more elements
Dependencies are inferred from the claim text.