PURPOSE: To separate the titled substance by easy operations, by hydroformylating 7-octen-1-al with H2 and CO in a solution containing a catalyst and separating 1,9-nonanedial effectively from the reaction mixture solution with a specific extracting agent.
CONSTITUTION: 7-Octen-1-al is hydroformylated in a solution of an aromatic hydrocarbon, e.g. toluene, containing a rhodium complex compound and a trisubstituted phsphine as a catalyst with a mixed gas of H2 with CO at 50W 120°C and 0.5W20 absolute atm, and the resultant reaction mixture solution is then extracted with an aqueous solution of 1,4-butanediol or 1,6-hexanediol as an extracting agent in an atmosphere of N2 gas, etc. at 10W60°C to extract and separate 1,9-nonanedial in the extracting agent layer. The residual layer after the extraction is recirculated through the hydroformylating step of the 7-octen-1-al for reuse.
USE: A raw material for azelaic acid, 1,9-nonanediamine, etc.
YOSHIMURA NORIAKI
TAMURA MASUHIKO
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