Process and apparatus for preparing saturated carboxyli acid having one to four carbo-ions

Application Number: 00102819
Application Date: 2000.03.10
Publication Number: 1269347
Publication Date: 2000.10.11
Priority Information: 1999/3/11 DE 199 10 866.8
International: C07C53/00;C07C53/02;C07C53/08;C07C53/122;C07C53/124;C07C51/21
Applicant(s) Name: International Electrochemical Industrial Co.
Inventor(s) Name: Kristoff Luting;Hans-Yurgen Ebeler;Mischaeir Harmann
Patent Agency Code: 72002
Patent Agent: yu hui
Abstract A process and an apparatus are for preparing saturated carboxylic acids having from one to four carbon atoms by gas-phase oxidation at a reaction temperature of from 100 DEG C to 400 DEG C and pressures of from 1.2×105 to 51×105 Pa in the presence of saturated or unsaturated C4-hydrocarbons and mixtures thereof. Also present in the reactor are an oxygen-containing gas and water vapor and in the presence of at least one catalyst, with part of the reactor outlet gas being recirculated in a reaction gas circuit. The acid concentration in the recirculated portion is reduced by means of a separation step, and the crude acid is separated from the reactor outlet gas by means of a countercurrent scrubber.