| 摘要 |
PURPOSE:To enable the absorptive recovery of the 4C component under pressure in the production of butadiene by the vapor-phase catalytic dehydrogenation of n-butene, independent on the conversion and the purity of the raw material, by removing the by-produced aldehyde from the produced gas prior to the compression of the gas. CONSTITUTION:(i) Butadiene is produced by the vapor-phase catalytic oxidative dehydrogenation (2) of n-butene, and (ii) the slight amount of the high-boiling by-product contained in the produced gas is removed (5) by cooling the gas. (iii) The aldehyde contained in the produced gas is removed (7) by conventional process, (iv) the gas is compressed (9), and (v) the 4C component containing butadiene and 4C hydrocarbons is recovered (11), (13), (15) from the compressed gas. The recovery of the 4C component can be carried out by the absorption under pressure, safely and easily in an industrial scale independent of the conversion of n-butene. Since the compressor 9 can be operated continuously for a long period without causing blocking, etc. of the apparatus, the process is especially effective in the case using an inexpensive raw material liable to generate by- products.
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