Abstract

Today, one of the challenging issues all over the world is the global warming which can be attributed to the emission of greenhouse gases into the environment as well as burning of gases in flare gas stream of industrial units. The latter can not only cause environmental problems but also is accompanied by wasting a great deal of energy. To deal with the aforementioned issue, the flare gas stream can be recycled after separating some species. In this investigation, the objective is to separate CO₂ and H₂ from the flare gas in addition to methanol production. In this regard, a separation with sorbent/solvent method is used which is divided into two stages: (1) H₂ separation by sorbent, (2) CO₂ separation by monoethanolamine solvent. From the obtained results in this study, in the first stage, H₂ and CO₂ can be purified up to 75% and 99.83%, respectively. Beside, methanol synthesis is compared in three different cases: (1) industrial unit, (2) CO₂ is fed into the reactor instead of CO, and (3) CO₂ and H₂ are fed to the reactor with stoichiometric coefficients. The obtained methanol production of the case (1) is approximately close to that of the case (3) and it is reduced 4% in case (3).

Graphic abstract

中文翻译：

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吸附吸收联合高效法从石化火炬气中回收氢气和二氧化碳至甲醇生产

摘要

如今，全球变暖是全球最具挑战性的问题之一，其原因可归结为温室气体向环境中的排放以及工业单位火炬气中气体的燃烧。后者不仅会造成环境问题，而且还会浪费大量能源。为了解决上述问题，可以在分离一些物种之后将火炬气流再循环。在该研究中，目标是除了生产甲醇之外，还从火炬气中分离出CO ₂和H ₂。在这方面，使用了用吸附剂/溶剂分离的方法，该方法分为两个阶段：（1）用吸附剂分离H ₂，（2）CO ₂用单乙醇胺溶剂分离。从本研究中获得的结果来看，在第一步中，H ₂和CO ₂可以分别纯化达75％和99.83％。此外，在三种不同情况下比较了甲醇的合成：（1）工业装置，（2）将CO ₂代替CO送入反应器，以及（3）以化学计量系数将CO ₂和H ₂送入反应器。情况（1）获得的甲醇产量近似接近情况（3），并且在情况（3）中减少了4％。

图形摘要