| US 7,514,521 B2 | ||
| Method for preparing a dialkyl carbonate, and its use in the preparation of diaryl carbonates and polycarbonates | ||
| Eugene Pauling Boden, Scotia, N.Y. (US); Ganesh Kailasam, Murcia (Spain); Larry Neil Lewis, Scotia, N.Y. (US); and Ignacio Vic Fernandez, Madrid (Spain) | ||
| Assigned to SABIC Innovative Plastics IP B.V., Bergen op Zoom (Netherlands) | ||
| Filed on Aug. 14, 2001, as Appl. No. 9/682,285. | ||
| Prior Publication US 2003/0092872 A1, May 15, 2003 | ||
| Int. Cl. C08G 64/00 (2006.01); C08G 63/02 (2006.01) | ||
| U.S. Cl. 528—196 [422/130; 422/191; 528/198; 528/271; 528/272; 558/277] | 28 Claims |
| 1. A method of preparing dimethyl carbonate, comprising:
reacting methanol, oxygen, carbon monoxide, and a catalyst to form a mixture comprising dimethyl carbonate, methyl chloroformate,
hydrochloric acid, water, carbon dioxide, and carbon monoxide; and
subjecting said mixture to conditions comprising a water concentration ([H2O]), a methanol concentration ([MeOH]), a temperature (T), and a residence time (t), such that a parameter X calculated according
to the expression
X=exp{−[(2.09×109)e(−6381/T)[H2O]+(4.14×1010)e(−7673/T)[MeOH]]t}
has a value less than about 0.9, wherein said water concentration and said methanol concentration are expressed in moles per
milliliter, said temperature is expressed in degrees Kelvin, and said residence time is expressed in minutes.
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