The application of process simulation to the technological transformations of Depropanizer in Daqing has been proved to be successful.

运用过程模拟技术，成功地完成了大庆脱丙烷塔的技术改造。

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Optimization with HYSYS system on depropanizer operation for cracking unit can reduce propylene loss and ensure the high quality C4 product.

通过HYSYS模拟系统，来优化裂解装置脱丙烷塔的操作，减少丙烯损失，保证C4产品质量。

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The necessity of C_3 hydrogenation unit existence in front depropanizer front hydrogenation flow of ethylene plant is studied and fully discussed.

对乙烯装置前脱丙烷前加氢流程中的C_3加氢单元存在的必要性作了探讨。

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