色谱法提纯鱼油中EPA/DHA生产过程甲醇回收工艺对比Comparison of methanol recovery processes in the production of EPA/DHA purified from fish oil by chromatography

旨在为色谱法从鱼油中进一步分离纯化DHA和EPA生产企业甲醇废液回收工艺方案选择提供参考，介绍了普通单塔精馏、双效精馏、单塔热泵精馏和双塔热泵精馏4种甲醇回收工艺流程和主要参数，并以40 t/h甲醇废液为例，利用Aspen Plus软件对4种甲醇回收工艺路线的运行能耗做了模拟计算，对其成本进行了对比分析。结果表明：普通单塔精馏、双效精馏、双塔热泵精馏和单塔热泵精馏的冷却能耗和加热能耗依次降低；对比压缩机电耗在内的综合能耗（折合标煤），普通单塔精馏最高，双塔热泵精馏、单塔热泵精馏和双效精馏综合能耗分别是普通单塔精馏的34.2%、35.3%和56.5%；普通单塔精馏、双效精馏、单塔热泵精馏和双塔热泵精馏吨废液处理成本分别为137.8、78.0、577、51.2 元/t；与单塔热泵精馏相比，双塔热泵精馏压缩机的压缩比可大大减小，可选机型多且技术成熟，设备采购费用降低。综上，双塔热泵精馏是最具竞争力的甲醇回收方案。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%, 353% 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.