Abstract
A novel process of membrane separation for H2/CO2 of shifted syngas coupled with gasoil hydrogenation (NMGH) is proposed. First, a new process, with two-stage CO2-selective and one-stage H2-selective membranes, was developed to substitute the conventional PSA separation devices to remove CO2 and purify H2 in coal gasification refineries to reduce energy consumption and investment costs. Then, the process was coupled with gasoil hydrogenation and the recycled H2 produced by the hydrogenation reactor could be further purified by the H2-selective membrane, which increased the H2 concentration of the hydrogenation reactor inlet by about 11 mol.% compared with the conventional direct recycling process, and the total system pressure was reduced by about 2470 kPa. At the same time, this additional membrane separation and purification prevented the accumulation of CO/CO2 in the recycled H2, which ensured the activity of the catalyst in the reactor and the long-term stable operation of the devices. Further, parameters such as compressor power, PI (polyimide)/PEO (polyethylene oxide) membrane area, pressure ratio on both sides of the membrane, and purity of make-up H2 were optimized by sensitivity analysis. The results showed that, compared with the conventional method, the NMGH process simplified operations, significantly reduced the total investment cost by $17.74 million, and lowered the total annual costs by $1.50 million/year.
Highlights
Gasoil quality worldwide is declining, as it is becoming heavier and the amount of harmful substances it contains, such as sulfur, nitrogen, olefins, and condensed aromatic hydrocarbons, is increasing [1]
A novel membrane separation process of H2/CO2 for shifted syngas produced by coal gasification coupled with the gasoil hydrogenation process was proposed in this work, which improved the CPGH process
A novel membrane separation process of H2 /CO2 for shifted syngas produced by coal gasification coupled with the gasoil hydrogenation process was proposed in this work, which improved the CPGH
Summary
Gasoil quality worldwide is declining, as it is becoming heavier and the amount of harmful substances it contains, such as sulfur, nitrogen, olefins, and condensed aromatic hydrocarbons, is increasing [1]. Burning inferior oil increases atmospheric pollution and causes severe acid rain and haze, which threatens the survival of humans and other living things. The need for upgrading petroleum products has resulted in higher requirements regarding the content of sulfur, nitrogen, olefins, and polycyclic aromatic hydrocarbons, while oil hydrogenation is the most effective conversion means for hazardous substances [2]. Hydrogen of greater quantity and better quality is needed in the upstream process to meet hydrogenation process requirements. Processes 2020, 8, 590 quantity and better quality is needed in the upstream process to meet hydrogenation process requirements. Hydrogen fromcoal coalgasification gasificationisisone oneofofthe theoldest oldest and most common methods of Hydrogen production production from and most common methods of H
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