Fremgangsmåte for fremstilling av butyraldehyd, n-butylalkohol, smörsyre og blandinger av disse

摘要

A propylene stream which contains propane as an impurity is contacted in a reactor A with carbon monoxide and hydrogen in the presence of a hydroformylation catalyst thereby producing a product stream containing butyraldehyde and/or n-butyl alcohol, unreacted propylene and propane. The butyraldehyde and/or butyl alcohol are separated from unreacted propylene and propane in a condenser B and a product recovery unit C. The process additionally utilises an adsorptive separator D to separate propylene from the propane impurity. This adsorption is carried out at a temperature of 0 to 250 DEG C in a bed of adsorbent which selectively adsorbs propylene, thereby adsorbing substantially all of the propylene from the gas mixture. The propylene is desorbed from the adsorbent and passed to the reactor A. The process is operated on a low per pass conversion with recycle of unreacted propylene. In the system of the invention the propylene adsorption unit D may receive feed solely from the condenser B and unit C (Figure 1) or may additionally receive as feed all the fresh propane and propylene entering the process.