Method for preparing acrylic acid from glycerol
AssigneeArkema France
InventorJean-Luc Dubois
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Abstract
The invention relates to a method for preparing acrylic acid from an aqueous glycerol solution, comprising a first step of dehydration of the glycerol to acrolein, carried out in the gas phase in the presence of a catalyst and under a pressure of between 1 and 5 bar, and a second step of oxidation of the acrolein to acrylic acid, in which an intermediate step is implemented, consisting in at least partly condensing the water and heavy by-products present in the stream issuing from the first dehydration step. This method serves to obtain high acrylic acid productivity and selectivity.
Claims8
1-3. (canceled)
A method for preparing acrylic acid from an aqueous glycerol solution, comprising the steps of:
- dehydrating the glycerol to acrolein, in the gas phase in the presence of a catalyst and under a pressure ranging from 1 to 5 bar,
- at least partly condensing water and heavy by-products issuing from the dehydration step;
- and
- oxidizing the acrolein to acrylic acid.
A method for preparing acrylic acid from an aqueous glycerol solution, comprising the steps of:
- dehydrating the glycerol to acrolein, in the gas phase in the presence of a catalyst and under a pressure sufficient to dehydrate said glycerol to acrolein,
- at least partly condensing water and heavy by-products issuing from the dehydration step;
- and
- oxidizing the acrolein to acrylic acid.
Dependencies are inferred from the claim text.