Method for separating carbon 5 fraction by NMP method and one-stage extraction and rectification
A technology of extractive distillation and extractive distillation column, which is applied in the field of separation of C5 fractions, can solve problems such as complex process and difficult operation, and achieve the effects of simplifying the process, reducing the amount of solvent used, and reducing the solvent ratio
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[0038] Refer below figure 1 The method of the present invention is further explained, but the present invention is not limited thereto.
[0039] A method for extracting and rectifying the separation of carbon five fractions of the present invention comprises the following steps:
[0040] (1) Light removal: mixed C5 cut raw material 7 (mainly composed of C4 8.4%, pentane 11.6%, pentene 19.2, alkyne 0.2%, isoprene 21.4%, cyclopentadiene 17.2%, meta Pentadiene 13.9%, C6 8.1%) enter light removal tower 1, light components 8 such as most alkynes, C4 and isopentane are extracted from the top of the tower, and the recovery rate of alkynes at the top of the tower is 99.7% %, the material in the light removal tower is sent to the dimerization reactor 2. The theoretical plate number of the light removal tower is 120, the operating reflux ratio is 16, the content of isoprene at the top of the light removal tower is controlled to be 1%, and the recovery rate of isopentane at the top of ...
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