Rahbari Ahmadreza, Ramdin Mahinder, van den Broeke Leo J P, Vlugt Thijs J H
Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Leeghwaterstraat 39, 2628CB Delft, The Netherlands.
Ind Eng Chem Res. 2018 Aug 8;57(31):10663-10674. doi: 10.1021/acs.iecr.8b02443. Epub 2018 Jul 17.
Syngas is an important intermediate in the chemical process industry. It is used for the production of hydrocarbons, acetic acid, oxo-alcohols, and other chemicals. Depending on the target product and stoichiometry of the reaction, an optimum (molar) ratio between hydrogen and carbon monoxide (H:CO) in the syngas is required. Different technologies are available to control the H:CO molar ratio in the syngas. The combination of steam reforming of methane (SRM) and the water-gas shift (WGS) reaction is the most established approach for syngas production. In this work, to adjust the H:CO ratio, we have considered formic acid (FA) as a source for both hydrogen and carbon monoxide. Using thermochemical equilibrium calculations, we show that the syngas composition can be controlled by cofeeding formic acid into the SRM process. The H:CO molar ratio can be adjusted to a value between one and three by adjusting the concentration of FA in the reaction feed. At steam reforming conditions, typically above 900 K, FA can decompose to water and carbon monoxide and/or to hydrogen and carbon dioxide. Our results show that cofeeding FA into the SRM process can adjust the H:CO molar ratio in a single step. This can potentially be an alternative to the WGS process.
合成气是化学加工行业中的一种重要中间体。它用于生产碳氢化合物、乙酸、羰基醇和其他化学品。根据目标产物和反应的化学计量，合成气中氢气与一氧化碳（H:CO）之间需要有一个最佳（摩尔）比。有多种技术可用于控制合成气中的H:CO摩尔比。甲烷蒸汽重整（SRM）和水煤气变换（WGS）反应的组合是合成气生产中最成熟的方法。在这项工作中，为了调整H:CO比，我们考虑将甲酸（FA）作为氢气和一氧化碳的来源。通过热化学平衡计算，我们表明可以通过将甲酸共进料到SRM过程中来控制合成气的组成。通过调整反应进料中FA的浓度，H:CO摩尔比可以调整到1到3之间的值。在蒸汽重整条件下，通常高于900 K时，FA可以分解为水和一氧化碳和/或氢气和二氧化碳。我们的结果表明，将FA共进料到SRM过程中可以一步调整H:CO摩尔比。这可能是WGS过程的一种替代方法。
