CATALYTIC CONVERSION OF HYDROXYPROPIONIC ACID OR DERIVATIVES THEREOF INTO ACRYLIC ACID AND DERIVATIVES THEREOF Russian patent published in 2016 - IPC C08F220/06 C08L33/02 C07C57/04 C07C51/377 C07C57/65 C07C57/55 B01J27/18 B01J27/187 B01J27/25 B01J35/10 B01J37/03 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing acrylic acid, acrylic acid derivatives or mixtures thereof, where, in particular, method includes a step of bringing into contact a flow containing hydroxypropionic acid, hydroxypropionic acid derivatives or mixture thereof, with catalyst containing (a) at least one anion of condensed phosphate, which is selected from a group consisting of formulae (I), (II) and (III), where n is equal to at least 2 and m is at least 1; and (b) at least two different cations, wherein said cations include: (i) at least one univalent cation and (ii) at least one polyvalent cation; catalyst is substantially neutrally charged; additionally molar ratio of phosphorus and said at least two different cations is 0.7-1.7, to obtain acrylic acid, acrylic acid derivatives or mixtures thereof as a result of contact with said catalyst.

EFFECT: methods for catalytic dehydration of hydroxypropionic acid, hydroxypropionic acid derivatives or mixtures thereof into acrylic acid, acrylic acid derivatives or mixture thereof are carried out with high output and selectivity and without significant conversion into undesirable by-products, such as acetaldehyde, propionic acid and acetic acid.

35 cl, 4 tbl, 15 ex