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Date of Publication:2016-01-01

Journal:化工进展

Issue:5

Page Number:1555-1560

ISSN No.:1000-6613

Abstract:The chilling process of traditional ethylene process has several disadvantages,including low condensation temperature,which requires significant amount of energy. To recover hydrogen from an ethylene plant of 800 kt/a,a hybrid process combining two-stage hydrogen separation membrane and cryogenics was proposed. Based on simulation and optimization with the UniSim Design software,the optimal conditions of this membrane system were identified,i.e,membrane areas in two stages were 28000m2and 10110m2,respectively. In conclusion,refrigeration compressor power and ethylene loss were significantly decreased because part of hydrogen was recovered by the first-stage membrane system. The compressor power in the chilling process was 39496kW,8996kW lower than that in the traditional process. The ethylene loss of demethanizer overhead decreased from 1.29% to 0.46%. H2 product with high concentration (99%) and high recovery (98.52%) was achieved through the second-stage membrane system,which could merge into hydrogen network directly or be used for hydrocracking with higher demand for hydrogen concentration.

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