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US 6,617,469 B2Granted
Process for preparing malonic diesters in a reactor with internal heat exchangers
AssigneeDegussa AG
InventorsFrank Bauer, Wilfried Latz, Uwe Prange, Christoph Theis
Life of this patent
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Abstract
A process for preparing malonic diesters by carbonylation of haloacetic esters and reaction with monohydric alcohols and a base in the presence of a transition metal catalyst, preferably a catalytic cobalt carbonyl complex, using a stirred reactor with one or more internal heat exchangers. The stirred reactor preferably contains a sparging stirrer.
Claims13
In a process for preparing malonic diesters represented by formula I by carbonylation:
- wherein
- R1 and R2 are each, independently of one another, an unbranched or branched alkyl or alkenyl group, a cycloalkyl group or an aralkyl group having from 1 to 30 carbon atoms, comprising:
- reacting a haloacetic ester represented by formula II:
- wherein
- R1 is as defined above;
- and
- Hal is a halogen atom,
- with carbon monoxide, a monohydric alcohol represented by the formula R20H, wherein R2 is as defined above, and a base, in the presence of a transition metal complex or salt thereof catalyst,
- the improvement comprising wherein the reaction is carried out in a stirred reactor having at least one internal heat exchanger.
6 more elements
Dependencies are inferred from the claim text.