Continuous manufacturing of polyol
AssigneeSaudi Arabian Oil Company
InventorsMohammad S. Alroaithi, Hussain M. Yami, Ola Ali, Wei Xu
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Abstract
A method of continuously producing a polyol includes: (i) feeding a solid catalyst into a continuous stirred tank reactor (CSTR); (ii) contacting a reaction mixture comprising one or more epoxides and carbon dioxide with the solid catalyst and a chain transfer agent comprising a plurality of sites capable of initiating copolymerization of epoxides and carbon dioxide in the CSTR; (iii) allowing polymerization reaction to proceed until a desired molecular weight polyol has formed; and (iv) terminating the polymerization reaction.
Claims13
A method of continuously producing a polycarbonate polyol, the method comprising:
- i) feeding a solid catalyst into a continuous stirred tank reactor (CSTR);
- ii) adding one or more epoxides and carbon dioxide to the CSTR thereby forming a reaction mixture;
- iii) contacting the reaction mixture comprising one or more epoxides and carbon dioxide with the solid catalyst and a chain transfer agent comprising a plurality of sites capable of initiating copolymerization of epoxides and carbon dioxide in the CSTR;
- iv) allowing polymerization reaction to proceed until a desired molecular weight polyol has formed;
- and
- v) terminating the polymerization reaction,
- wherein a polydispersity index of the polyol is within a range from about 1.2 to about 1.45, and
- wherein a viscosity of the polyol at 75 degrees C. is within a range from about 100 centipoise to about 10,000 centipoise.
A method of continuously producing a polycarbonate polyol, the method comprising:
- i) feeding a solid catalyst into a continuous stirred tank reactor (CSTR);
- ii) adding one or more epoxides and carbon dioxide to the CSTR thereby forming a reaction mixture;
- iii) contacting the reaction mixture comprising one or more epoxides and carbon dioxide with the solid catalyst and a chain transfer agent comprising a plurality of sites capable of initiating copolymerization of epoxides and carbon dioxide in the CSTR;
- iv) allowing polymerization reaction to proceed until a desired molecular weight polyol has formed;
- and
- v) terminating the polymerization reaction
- where a moisture level of the reaction mixture is below a moisture tolerance level of the polymerization reaction, and
- wherein the method does not include drying either the reaction mixture or the chain transfer agent prior to the polymerization reaction.
A method of continuously producing a polycarbonate polyol, the method comprising:
- i) feeding a solid catalyst into a continuous stirred tank reactor (CSTR);
- ii) adding one or more epoxides and carbon dioxide to the CSTR thereby forming a reaction mixture
- iii) contacting the reaction mixture comprising one or more epoxides and carbon dioxide with the solid catalyst and a chain transfer agent comprising a plurality of sites capable of initiating copolymerization of epoxides and carbon dioxide in the CSTR;
- iv) allowing polymerization reaction to proceed until a desired molecular weight polyol has formed;
- and
- V terminating the polymerization reaction
- wherein there is no observable induction time of the solid catalyst subsequent to reactor startup, and
- wherein the solid catalyst is not activated prior to the feeding step.
Dependencies are inferred from the claim text.