METHOD OF NEUTRALISING ACIDIC IMPURITIES DURING SYNTHESIS OF ACRYLATES AND APPARATUS FOR REALISING SAID METHOD Russian patent published in 2012 - IPC C07C67/58 C07C67/60 C07C67/48 C07C69/54 B01J14/00 

FIELD: chemistry.

SUBSTANCE: in the method of neutralising acidic impurities during synthesis of acrylates, the neutralising agent used is ammonia solution with concentration of not less than 0.01% in amount which ensures pH of the mixture of 5.5-6.7, said mixture being formed after mixing the neutralising agent with raw acrylate. Said method involves preparation of a neutralising agent, mixing the prepared neutralising agent and raw acrylate followed by phase separation of the mixture into a top organic layer of raw acrylate and a bottom aqueous layer of spent neutralising agent. Copper sulphate is also added to the ammonia solution in amount of 0.6-0.12 wt %. When preparing the neutralising agent, the solution is mixed through circulation thereof. Ammonia solution concentration of 1-2% if optimum for industrial engineering. The apparatus has containers connected by pipes for preparing aqueous solution for the neutralising agent, a circulation pump, an overhead tank, a pump, a mixer, a phase separator, as well as an overhead tank for raw acrylate connected with the pump. The apparatus also has a container for ammonia solution and an additional pump fitted at the inlet of the container for preparing ammonia solution, and a pH metre fitted at the outlet of the mixer, where the mixer is in form of a turbulator. The turbulator is a metal pipe into which a disc with holes is fitted perpendicular the longitudinal axis, said disc being made from fluoroplastic or steel.

EFFECT: obtaining a high-purity end product, characterised by low content of acidic impurities, achieved owing to use of structural components and process operations which enable addition of a neutralising agent according to a defined scheme.

5 cl, 2 dwg, 1 tbl, 12 ex