METHOD OF OBTAINING DIARYL CARBONATES OR ALKYLARYL CARBONATES FROM DIALKYL CARBONATES Russian patent published in 2013 - IPC C07C68/06 B01D3/00 

FIELD: chemistry.

SUBSTANCE: invention relates to improved method of obtaining, at least, one diaryl carbonate of formula (I) and/or alkylaryl carbonate of formula (IV) from, at least, one dialkyl carbonate and, at least, one aromatic hydroxy-compound of formula III , where R, R' and R" independent on each other represent hydrogen atom, linear or branched alkyl with 1-34 carbon atoms, alkoxy with 1-34 carbon atoms, cycloalkyl with 5-34 carbon atoms, alkylaryl with 7-34 carbon atoms, aryl with 6-34 carbon atoms or halogen residue, and R can also stand for - COO-R'" group, in which R'" can stand for hydrogen atom, linear or branched alkyl with 1-34 carbon atoms, alkoxy with 1-34 carbon atoms, cycloalkyl with 5-34 carbon atoms, alkylaryl with 7-34 carbon atoms or aryl with 6-34 carbon atoms, and R¹ is linear or branched alkyl with 1-34 carbon atoms, in which (a) dialkyl carbonate or dialkyl carbonates in presence of, at least, one re-esterification catalyst is subjected to interaction with aromatic hydroxy-compound or aromatic hydroxy-compounds in first reaction column, which contains, at least, one strengthening part in head part of column and, at least one reaction zone under strengthening part, which contains, at least, two sections, (b) vapour, released in head part of first reaction column, is fully or partly condensed in, at least, one condenser, (c) cube product of first reaction column is supplied into, at least, one more reaction column, which contains, at least, one strengthening part in head part of column and, at least, one reaction zone under strengthening part, and it is subjected in said column (said columns) to further conversion, (d) non-converted in reaction columns or formed during reaction dialkyl carbonate is completely or partly separated from alkyl alcohol, formed during reaction, at least, at one more stage of method, which includes, at least, one distillation column and (e) separated at stage (d) dialkyl carbonate, in case of necessity, after further purification is re-supplied into first reaction column, where additional reaction column (additional reaction columns) is equipped with one or several condensers, and that condensation heat, formed in condensation in said condensers is directly or indirectly returned to process.

EFFECT: increased method efficiency.

12 cl, 4 dwg, 2 ex