Effects of the SAPO-11 synthetic process on dehydration of ethanol to ethylene

doi:10.1007/s11705-010-0540-7

Front Chem Sci Eng

2011, Vol. 5

Issue (1) : 60-66 https://doi.org/10.1007/s11705-010-0540-7

RESEARCH ARTICLE

Effects of the SAPO-11 synthetic process on dehydration of ethanol to ethylene

Lina WU¹, Xiaoxing SHI¹, Qun CUI¹(

), Haiyan WANG¹, He HUANG²

1. College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China; 2. Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 210009, China

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Abstract

The effects of the synthetic condition of SAPO-11 molecular sieves on ethanol dehydration to ethylene were studied. Product-compositions, ethanol conversion, and selectivity to ethylene of synthesized and commercial SAPO-11 molecular sieves were compared. Results are as follows: the optimal synthetic conditions for SAPO-11 molecular sieves are adding pseudoboehmite before orthophoshporic, using di-n- propylamine as the template, having a mass fraction of 40% colloidal silica as the silica source and the starting gel obtained, and running at 200°C for 48 h. From the patterns of NH₃-TPD, the amount of acid synthesized by SAPO-11 molecular sieves is less than that by commercial SAPO-11 molecular sieves, and has a stronger weak acid. Also, ethanol conversion and selectivity to ethylene reached 99% at 280°C on synthesized SAPO-11, lower by 20°C compared to commercial SAPO-11. For two SAPO-11 molecular sieves, the by-products in the gas phase are mainly ethane, propane, propene, isobutane, n-butane, propadiene, butylene and some higher hydrocarbons. The by-products in the liquid phase are ethyl ether and acetaldehyde.

Keywords SAPO-11 molecular sieves synthesis ethanol ethylene dehydration

Corresponding Author(s): CUI Qun,Email:cuiqun@njut.edu.cn

Issue Date: 05 March 2011

Cite this article:

Lina WU,Xiaoxing SHI,Qun CUI, et al. Effects of the SAPO-11 synthetic process on dehydration of ethanol to ethylene[J]. Front Chem Sci Eng, 2011, 5(1): 60-66.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-010-0540-7
https://academic.hep.com.cn/fcse/EN/Y2011/V5/I1/60

Tab.1 Different chemical component of SAPO-11 molecular sieves

Fig.1 Influence of crystal time on ethanol conversion of SAPO-11 molecular sieves

Fig.2 Influence of crystal time on selectivity to ethylene of SAPO-11 molecular sieves

Fig.3 Influence of adding orders on ethanol conversion of SAPO-11 molecular sieves

Fig.4 Influence of adding orders of SAPO-11 molecular sieves on selectivity to ethylene

Fig.5 Influence of different templates on ethanol conversion of SAPO-11 molecular sieves

Fig.6 Influence of different templates on selectivity to ethylene of SAPO-11 molecular sieves

Fig.7 Influence of different silicasols on ethanol conversion of SAPO-11 molecular sieves

Fig.8 Influence of different silicasols on selectivity to ethylene of SAPO-11 molecular sieves

Fig.9 XRD patterns of synthesized SAPO-11 molecular sieves (a) and commercial SAPO-11 molecular sieves (b)

Fig.10 NH-TPD patterns of synthesized SAPO-11 molecular sieves (a) and commercial SAPO-11 molecular sieves (b)

Fig.11 SEM patterns of synthesized SAPO-11 molecular sieves (× 2000) (a) and commercial SAPO-11 molecular sieves (× 10000) (b)

Fig.12 Ethanol conversion of two SAPO-11 molecular sieves

Fig.13 Selectivity to ethylene on two SAPO-11 molecular sieves

Tab.2 Product-compositions of two SAPO-11 molecular sieves at different temperatures

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