METHOD OF PRODUCING ACRYLIC ACID FROM LACTIC ACID OR LACTIDE USING MOLTEN SALT CATALYSTS Russian patent published in 2020 - IPC C07C51/353 C07C51/363 C07C51/377 C07C53/19 C07C57/04 

FIELD: technological processes.

SUBSTANCE: invention relates to an improved method of producing acrylic acid with high selectivity and output, involving the following steps: a) contacting a stream of incoming materials containing lactic acid, lactide or mixtures thereof with a first molten salt catalyst in a first reactor at a first reaction temperature during a first reaction time to obtain a first stream containing 2-bromopropionic acid (2-BrPA); b) contacting said 2-BrPA with a second molten salt catalyst in a second reactor at a second reaction temperature for a second reaction time to obtain a second stream containing 3-bromopropionic acid (3-BrPA) and said acrylic acid; and c) contacting said 3-BrPA with an amine in a third reactor at a third reaction temperature for a third reaction time to obtain a third stream containing said acrylic acid; wherein said first molten salt catalyst comprises an anion (Br^-) bromide; and wherein said second molten salt catalyst comprises Br^-, wherein said acrylic acid of said second stream is combined with said acrylic acid of said third stream into production stream of said acrylic acid; wherein said acrylic acid in said production stream has a common yield of acrylic acid and total acrylic acid selectivity.

EFFECT: disclosed is an improved method of producing acrylic acid.

15 cl, 2 dwg, 6 tbl, 56 ex