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| Comparison of methanol recovery processes in the production of EPA/DHA purified from fish oil by chromatography |
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| DOI：10.19902/j.cnki.zgyz.1003-7969.240049 |
| KeyWord:fish oil methanol energy consumption heat pump distillation compressor |
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| Abstract: |
| To provide reference for the selection of methanol recovery process schemes for further separation and purification of DHA and EPA from fish oil using chromatography. Four methanol recovery process flows and main parameters including common single-column distillation, double-effect distillation, single-column heat pump distillation and double-column heat pump distillation were introduced. Taking 40 t/h methanol waste liquid as an example, using Aspen Plus software, the operation energy consumption of the four methanol recovery process routes was simulated and calculated, and their costs were compared and analyzed. The results showed that the cooling energy consumption and heating energy consumption of common single-column distillation, double-effect distillation, double-column heat pump distillation and single-column heat pump distillation decreased in turn. Compared in the comprehensive energy consumption (converted to standard coal) including the electricity consumption of the compressor, the common single-column distillation was the highest, and the comprehensive energy consumption of double-column heat pump distillation, single-column heat pump distillation and double-effect distillation was 34.2%, 353% and 56.5% of that of common single-column distillation respectively. The treatment cost of single-column distillation, double-effect distillation, single-column heat pump distillation and double-column heat pump distillation was 137.8, 78.0, 57.7, 51.2 yuan/t, respectively. Compared with single-column heat pump distillation, the compression ratio of the compressor in double-column heat pump distillation could be greatly reduced, the optional models were more and the technology was mature, and the equipment procurement cost was reduced. In conclusion, double-column heat pump distillation is the most competitive methanol recovery scheme. |
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