CATALYSTS FOR PRODUCING ACRYLIC ACID OR DERIVATIVES THEREOF Russian patent published in 2016 - IPC B01J27/18 B01J27/25 B01J35/10 B01J37/03 C07C51/377 C07C57/65 C07C57/55 

FIELD: chemistry.

SUBSTANCE: there are presented catalysts for dehydration of 3-hydroxypropionic acid, derivatives 3-hydroxypropionic acid or mixtures thereof into acrylic acid, acrylic acid derivatives or their mixture with high output and selectivity, short time of stay, and without significant conversion in undesirable by-products, such as, for example, acetaldehyde, propionic acid and acetic acid. Catalyst contains mono-phosphate salt described by formula (III): and mono-phosphate salt described by formula (IV): where M^I represents univalent cation and M^II is divalent cation, wherein catalyst, in fact, is neutral charged and molar ratio of said M^IIHPO₄ and said M^IH₂PO₄ in above catalyst is from 0.2 to 5. Method of producing said catalyst includes step where mixed compounds containing phosphor, wherein above compounds contain compound of formula (VI), wherein mentioned a is equal to 1, and compound of formula (VII), where specified a equal to 2:

where M^I represents univalent cation, where M^II is divalent cation. Another method of producing catalyst includes step on which are BaHPO₄ and KH₂PO₄ are combined in molar ratio of 3:2 to 2:3 to form solid mixture and ground said solid mixture to produce said catalyst.

EFFECT: dehydration 3-hydroxypropionic acid, derivatives 3-hydroxypropionic acid or mixtures thereof into acrylic acid, acrylic acid derivatives or their mixture with high output and selectivity.

12 cl, 1 tbl, 3 ex