Method for producing glycerol carbonate methacrylate
View Patent ↗The invention relates to a method for producing glycerol carbonate methacrylate in the presence of metal-chelate catalysts of the metal ion-1,3-diketonate type.
1. A process for preparing (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate, comprising:
transesterifying methyl methacrylate with glycerol carbonate in the presence of stabilizers and a metal chelate catalyst of the metal ion 1,3-diketonate type,
precipitating the catalyst, and
separating off a filtrate.
2. The process for preparing (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate, according to claim 1 wherein the metal chelate catalyst is zirconium acetylacetonate.
3. The process for preparing (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate, according to claim 1 wherein the transesterifying methyl methacrylate with glycerol carbonate takes place at 50-80° C.
4. The process for preparing (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate, according to claim 3 , wherein the transesterifying methyl methacrylate with glycerol carbonate takes place at 70° C.
5. The process for preparing (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate, according to claim 2 wherein zirconium acetylacetonate comprises 0.1-5.0% by weight, based on the total weight of the batch.
6. The process for preparing (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate, according to claim 5 wherein zirconium acetylacetonate comprises 1.0-3.0% by weight, based on the total weight of the batch.
7. The process for preparing (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate, according to claim 1 wherein an amount of crosslinker formed during the preparation is less than 5% by weight.
8. The process for preparing (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate, according to claim 1 comprising stabilizers in amounts of 0.01-0.50% by weight.
9. The process for preparing (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate, according to claim 7 wherein the amount of crosslinker formed during the preparation is less than 3% by weight.
10. The process according to claim 1 , wherein the precipitating the catalyst comprises adding dilute phosphoric acid.
11. The process according to claim 1 , wherein the separating off the filtrate comprises passing a suspension of a precipitated mixture through a pressure filter.