Differences in Product Distribution Measured with Flame Ionization Detector Gas Chromatography and Thermal Conductivity Detector Gas Chromatography during the Dimethyl Ether-to-Olefins and Methanol-to-Olefins Processes,Energy & Fuels

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Differences in Product Distribution Measured with Flame Ionization Detector Gas Chromatography and Thermal Conductivity Detector Gas Chromatography during the Dimethyl Ether-to-Olefins and Methanol-to-Olefins Processes
Energy & Fuels ( IF 5.2 ) Pub Date : 2017-11-09 00:00:00 , DOI: 10.1021/acs.energyfuels.7b02145
Yuli Gao ₁ , Yingqian Cao ₁ , Sheng-Li Chen ₁ , Ya Wang ₁ , Ruyue Zhu ₁ , Wei Sun ₁ , Qi Zhang ₁ , Yu Fan ₁

Affiliation

It is generally accepted that the products of dimethyl ether (DME)-to-olefins (DTO) and methanol-to-olefins (MTO) processes are hydrocarbons; therefore, gas chromatography (GC) equipped with a flame ionization detector (FID) rather than a thermal conductivity detector (TCD) is usually used to measure their product distribution for the higher response sensitivity of FID than TCD. Product distributions of DTO and MTO processes over SAPO-34 and metal-oxide-modified SAPO-34 catalysts were measured in this research work with GC equipped with FID and TCD. Results showed that product distribution over SAPO-34 measured with FID GC alone was similar to that measured with TCD + FID GC when the DME or methanol conversions were close to 100% and the main products were hydrocarbons, with only trace amounts of H₂ and carbon oxides in the products. When using metal-oxide-modified SAPO-34 as the catalyst, it was found that the product distribution measured by TCD + FID GC was greatly different from that measured by FID GC alone. A lot of H₂ and carbon oxides were detected with TCD + FID GC, which are missed when using the sole FID GC to analyze the products. The accurate measurement of the complete product distribution spectrum is of importance for not only the calculation of product yields, mass balance, and reaction heat but also the investigation of reaction mechanisms and reaction kinetics. It is strongly suggested that TCD + FID GC be used to analyze the product distribution of DTO and MTO processes, especially when SAPO-34 is promoted with other components.

中文翻译：

在二甲醚制烯烃和甲醇制烯烃过程中，用火焰电离检测器气相色谱法和热导率检测器气相色谱法测得的产品分布差异

通常认为，二甲醚（DME）制烯烃（DTO）和甲醇制烯烃（MTO）工艺的产物是碳氢化合物。因此，通常使用配备有火焰离子化检测器（FID）而不是热导检测器（TCD）的气相色谱仪（GC）来测量其产物分布，以使FID的响应灵敏度高于TCD。在这项配备FID和TCD的GC的研究工作中，对SAPO-34和金属氧化物改性的SAPO-34催化剂上DTO和MTO工艺的产品分布进行了测量。结果表明，当DME或甲醇的转化率接近100％并且主要产物为烃类且仅含痕量的H _2时，仅用FID GC测得的SAPO-34上的产物分布与TCD + FID GC测得的相似。和产品中的碳氧化物。当使用金属氧化物改性的SAPO-34作为催化剂时，发现用TCD + FID GC测定的产物分布与仅用FID GC测定的产物分布有很大差异。TCD + FID GC检测到许多H ₂和碳氧化物，而使用唯一的FID GC分析产物时会漏掉这些H ₂和碳氧化物。准确测量完整的产品分布范围不仅对于计算产物收率，质量平衡和反应热，而且对反应机理和反应动力学的研究都很重要。强烈建议将TCD + FID GC用于分析DTO和MTO工艺的产品分布，尤其是当SAPO-34与其他组分一起使用时。

更新日期：2017-11-09

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