Itaconic anhydride synthesis
- Product Name:Itaconic anhydride
- CAS Number:2170-03-8
- Molecular formula:C5H4O3
- Molecular Weight:112.08
Yield:-
Reaction Conditions:
with acetic anhydride at 80;
Steps:
1.1; 1.2 Stage 1: Itaconic Acid Anhydride
612 g (6.0 mol) of acetic anhydride were placed in a 2-litre three-necked flask with KPG stirrer, 15-Vigreux column and column head and 780 g (6.0 mol) of solid itaconic acid was added while stirring. The mixture was then slowly heated to 80° C. until the solid was dissolved and stirred for another 30 minutes at this temperature. Subsequently, approx. 680 g acetic acid was distilled off at a vacuum between 150 and 10 mbar and a sump temperature of 80 to 82° C. The acetic acid was then removed from the sample. Approx. 690 g of sump bottom product remained, the raw yield being 680 g. The raw product was used directly in stage 2. A 5 g sample of the ester was purified by ball tube distillation and analyzed by gas chromatography and had a composition of 11 wt. % citraconic acid anhydride and 89 wt. % itaconic acid anhydride.
References:
SYMRISE AG;Chandrasekaran, Vijayanand;Panten, Johannes;Koch, Oskar;Diaz Gomez, Edison US2020/10402, 2020, A1 Location in patent:Paragraph 0317-0319
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