Method For The Production Of Acrylic Acid Or Its Derivatives
AssigneeThe Procter & Gamble Company
InventorsJuan Estaban Velasquez, Janette Villalobos Lingoes, Dimitris Ioannis Collis, Jane Ellen Godlewski
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Abstract
Methods for catalytically dehydrating hydroxypropionic acid, hydroxypropionic acid derivatives, or mixtures thereof to acrylic acid, acrylic acid derivatives, or mixtures thereof with high yield and selectivity and without significant conversion to undesired side products, such as, acetaldehyde, propionic acid, and acetic acid, are provided. The catalysts are mixed monophosphates.
Claims43
A method of making acrylic acid, acrylic acid derivatives, or mixtures thereof comprising contacting a stream comprising hydroxypropionic acid, hydroxypropionic acid derivatives, or mixtures thereof with a catalyst comprising:
- c. monohydrogen monophosphate anion described by formula (I):
- [HPO4]2− (I),
- d. and dihydrogen monophosphate anions described by formula (II):
- [H2PO4]− (II), and
- c. at least two different cations,
- wherein the catalyst is essentially neutrally charged;
- and further, wherein the molar ratio of said monohydrogen monophosphate anion to said dihydrogen monophosphate anion in said catalyst is between about 0.1 and about 10.
A method of making acrylic acid comprising contacting:
- (a) a gaseous mixture comprising:
- (i) lactic acid,
- (ii) water, and
- (iii) nitrogen,
- wherein said lactic acid is present in an amount of about 2.5 mol % and wherein said water is present in an amount of about 50 mol % based on the total moles of said gaseous mixture, with
- (b) a catalyst prepared by a method comprising combining BaHPO4 and KH2PO4 in a molar ratio between about 3:2 and about 2:3 to form a solid mixture, and grinding said solid mixture to produce said catalyst, and
- wherein, said contacting of said gaseous mixture with said catalyst is performed at a temperature of about 300° C. to about 450° C., at a GHSV of from about 7,200 h−1 to about 3,600 h−1 and at a pressure of about 360 psig, in a reactor having an interior surface comprising material selected from the group consisting of quartz and borosilicate glass, whereby acrylic acid is produced as a result of said lactic acid being contacted with said catalyst.
Dependencies are inferred from the claim text.