METHOD OF CONTROLLING METHOD OF PRODUCING POLYISOCYANATES Russian patent published in 2020 - IPC C07C263/10 C08G18/76 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to controlling production of polyisocyanates. Disclosed is a method of producing aromatic polyisocyanate in an apparatus for producing isocyanates containing a reactor section for a phosgenation reaction, where primary aromatic amine reacts with phosgene compounds in reactor section to obtain reaction product containing isocyanate, and where concentration of CO₂ in gases coming from reactor section, measured and analyzed, and wherein the phosgenation reaction conditions are controlled when CO₂ concentration in gases coming from the reactor section is higher than the background concentration of CO₂. Also disclosed is version of proposed method for installation containing extraction section.

EFFECT: technical result is that the disclosed methods allow analyzing formation of by-products during the process and minimizing the amount thereof.

15 cl, 4 dwg, 1 ex