METHOD OF INCREASING SELECTIVITY OF EPOXIDATION CATALYST Russian patent published in 2017 - IPC C07D301/10 C07C29/10 C07C41/03 C07C213/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of improving selectivity of epoxidation process and a method of producing 1,2-diol, 1,2-diol ether, 1,2-carbonate or alkanolamine. Method of improving selectivity of epoxidation process involves: (a) contacting a catalyst layer containing a highly selective silver-containing catalyst on a substrate for a period of initiation of process, following a starting step, with supplied gas, having concentration of ethylene (E₁), concentration of oxygen (O₁), concentration of carbon dioxide (C₁) lower than 2.0 vol%. and concentration of chloride moderator (M₁), achieving required intensity of operation, which will lead to creation of a first operating temperature of catalyst T₁, which is less than 240 °C; (b) adjusting loaded composition by reducing concentration of ethylene to new limiting level E₂<E₁; and/or reducing oxygen concentration to a new limiting level O₂<O₁, and/or raising concentration of carbon dioxide to a new limiting level C₂>C₁, and/or adjusting concentration of chloride moderator or to higher, or to a lower level in order to take catalyst to a high operating temperature T₂ for a specific highly selective catalyst, while still being used at a specific required intensity of operation during said period of initiation of process, where T₂ is 5-30 °C higher than T₁; and (c) gradual adjustment of loaded composition as catalyst activity naturally falls, with maintaining of required intensity of operation and operating temperature T₂ by raising level of ethylene, and/or raising level of oxygen and/or lowering carbon dioxide level, and/or by adjusting moderator composition.

EFFECT: technical result is high selectivity of epoxidation process.

16 cl, 2 dwg, 2 ex