| 摘要 |
A process is proposed for purifying a recycle stream (1) from an installation (A) processing 1,3-butadiene, wherein - the recycle stream (1) is divided into two substreams, namely a first substream (3) which is purified in a stripping column (K1) for prepurification of the pure 1,3-butadiene feed stream (2), obtaining a first purified recycle stream (4) which co-comprises the prepurified pure 1,3-butadiene feed stream (2), and also - a second substream (5) which is purified in an extracted distillation installation by extractive distillation using a selective solvent (6), wherein the extractive distillation installation comprises - a main scrubber (K2) which is constructed as an enrichment column, and also - a gas-stripper column (K3), with the proviso that the recycle stream (1) is divided in such a manner that a quantitative stream as large as possible is apportioned to the first substream (3), maintaining the specification requirements for the sum of all streams that are fed into the installation (A) processing 1,3-butadiene, of a fraction of 1,3-butadiene of greater than or equal to 90% by weight, based on the total weight of the C4 hydrocarbons of the sum of all streams fed into the installation (A) processing 1,3-butadiene. |
