Öz
2,6-dimethyl naphthalane (2,6-DMN ) is an important dimethyl naphthalene (DMN) which is used in the synthesis of a new polymer polyethylene naphthalate’s (PEN) monomers 2,6-naphthalane dicarboxylic acid (2,6-NDCA). DMN’s are nine isomers and among them 2,6-DMN is the most important one. So far zeolites which have different qualities have been used for 2,6-DMN synthesis. In this work, methylation of 2 methyl naphthalene (2-MN) for synthesis of 2,6-DMN over Cu and La modified Y zeolite (CBV720, surface area=726m2/g\ SiO2/Al2O3=30), as experimental was intended for the finding of rate expression. In methylation reaction molar ratio of 1:5:5 2-MN:1,3,5 trimethyl benzene (mesitylene): methanol was fed into the reactor. For kinetic experiments, the changing of 2-MN conversion, the formation of 2,6-DMN and 2,6-DMN / 2,7-DMN ratio with different temperature, space velocity and catalyst were researched. For methylation kinetic, the rate expression depending on the 2MN and methanol concentration was determined. Arrhenius equation was used for calculation of frequency factor (ko) and activation energy (EA)
Anahtar Kelimeler
Kaynakça
- Chen, Z., Xin Wen, G., Ya Nan W., Xiang Sheng, W. and Chun Shan, S., (2007). Methylation of 2- Methylnaphthalane with Methanol to 2,6-Dimethylnaphthalane Over HZSM-5 Modified by NH4F and SrO, Chinese Chemical Letters, 18, 1281-1284.
- Liang, Z., Xinmen, G., Min, L., Xiangsheng, W. and Chunshan, S., (2010). Methylation of 2- Methylnaphthalene with Methanol over NH4F and Pt Modified HZSM-5 Catalysts, Chinese Journal of Chemical Engineering, 18(5), 742-749.
- Lin, L., Fang, Y. and Hu, H., (2006). Selective Synthesis of 2,6-Dimethylnaphthalene by Methylation of 2-Methylnaphthalene with Methanol on Zr/(Al)ZSM-5, Catalysis Communications, 7, 255- 259.
- Park, J. N., Wang, J., Hong, S. I. and Lee, C.M. and (2005). Effect of Dealumination of Zeolite Catalysts on Methylation of 2-Methylnaphthalene in a High-pressure Fixed-bed Flow Reactor, Applied Catalysis A: General, 292, 68-75.
- Park J. N., Wang J., Lee C.W. and Park S. E., (2002). Methylation of Naphthalane with methanol over Beta, Mordenite, ZSM-12 and MCM-22 zeolite Catalysts, Bulletin Korean of Chemical Society, Vol.23, No.7.
- Pu, S. B. and Inui, T., (1996). Synthesis of 2,6-Methylnaphthalene by Methylation of Methylnaphthalene on Medium and Large-pore Zeolite Catalysts, Applied Catalysis A: General, 146, 305-316.
- Yuan, B., Li, Z., Liu, Y. and Zhang, S., (2008). liquid Phase Acylation of 2-Methylnaphthalene Catalyzed by H- beta Zeolite, Journal of Molecular Catalysis A: Chemical, 280, 210-218.
- Zhang, C., Guo, X., Song, C., Zhao, S. and Wang, X., (2010). Effects of Steam and TEOS Modification on HZSM-5 Zeolite for 2,6-Dimethylnaphthalene Synthesis by Methylation of 2- Methylnaphthalene with Methanol, Catalysis Today, 149, 196-201.
- Zhao, L., Wang, H., Lui, M., Guo, X., Wang, X., Song, C. and Lui, H., (2008). Shape-selective Methylation of 2-Methylnaphthalene with Methanol over Hydrothermal Treated HZSM-5 Zeolite Catalysts, Chemical Engineering Science, 63, 5298-5303.
Öz
2,6-Dimetilnaftalin (2,6-DMN), yeni bir polimer olan polietilen naftalatın (PEN) monomerlerinden biri 2,6-naftalin dikarboksilik asitin (2,6-NDCA) üretiminde kullanılan önemli bir dimetilnaftalindir. Dimetil naftalinlerin dokuz adet izomeri vardır ve bunların içinde, 2,6-DMN en önemlisidir. Günümüze kadar 2,6-DMN sentezi için değişik özelliklere sahip zeolit katalizörler kullanılmıştır. Bu çalışmada, Cu ve La metalleri ile modifiye edilmiş Y zeolit (CBV720, yüzey alanı=726m2/g\ SiO2/Al2O3=30) katalizörler üzerinde 2 metil naftalinin (2-MN) metilasyonuyla 2,6-DMN sentezinde, deneysel olarak metilasyon reaksiyonu hız ifadesinin bulunması amaçlanmıştır. Metilasyon reaksiyonunda reaktöre mol oranı 1:5:5 olan 2-MN: 1,3,5-trimetilbenzen (mezitilen): metanol karışımı beslenmiştir. Kinetik deneylerinde, 2-MN dönüşümünün, 2,6-DMN oluşumunun, 2,6-DMN/2,7-DMN oranının, farklı sıcaklık, boşluk hızı ve katalizör ile değişimleri bulunmuştur. Metilasyon kinetiğinde, 2-MN ve metanol derişimine bağlı reaksiyon hız ifadesi bulunmuştur. Arrhenius denklemi yardımıyla frekans faktörü (k0) ve aktivasyon enerjisi (EA) de hesaplanmıştır.
Anahtar Kelimeler
Kaynakça
- Chen, Z., Xin Wen, G., Ya Nan W., Xiang Sheng, W. and Chun Shan, S., (2007). Methylation of 2- Methylnaphthalane with Methanol to 2,6-Dimethylnaphthalane Over HZSM-5 Modified by NH4F and SrO, Chinese Chemical Letters, 18, 1281-1284.
- Liang, Z., Xinmen, G., Min, L., Xiangsheng, W. and Chunshan, S., (2010). Methylation of 2- Methylnaphthalene with Methanol over NH4F and Pt Modified HZSM-5 Catalysts, Chinese Journal of Chemical Engineering, 18(5), 742-749.
- Lin, L., Fang, Y. and Hu, H., (2006). Selective Synthesis of 2,6-Dimethylnaphthalene by Methylation of 2-Methylnaphthalene with Methanol on Zr/(Al)ZSM-5, Catalysis Communications, 7, 255- 259.
- Park, J. N., Wang, J., Hong, S. I. and Lee, C.M. and (2005). Effect of Dealumination of Zeolite Catalysts on Methylation of 2-Methylnaphthalene in a High-pressure Fixed-bed Flow Reactor, Applied Catalysis A: General, 292, 68-75.
- Park J. N., Wang J., Lee C.W. and Park S. E., (2002). Methylation of Naphthalane with methanol over Beta, Mordenite, ZSM-12 and MCM-22 zeolite Catalysts, Bulletin Korean of Chemical Society, Vol.23, No.7.
- Pu, S. B. and Inui, T., (1996). Synthesis of 2,6-Methylnaphthalene by Methylation of Methylnaphthalene on Medium and Large-pore Zeolite Catalysts, Applied Catalysis A: General, 146, 305-316.
- Yuan, B., Li, Z., Liu, Y. and Zhang, S., (2008). liquid Phase Acylation of 2-Methylnaphthalene Catalyzed by H- beta Zeolite, Journal of Molecular Catalysis A: Chemical, 280, 210-218.
- Zhang, C., Guo, X., Song, C., Zhao, S. and Wang, X., (2010). Effects of Steam and TEOS Modification on HZSM-5 Zeolite for 2,6-Dimethylnaphthalene Synthesis by Methylation of 2- Methylnaphthalene with Methanol, Catalysis Today, 149, 196-201.
- Zhao, L., Wang, H., Lui, M., Guo, X., Wang, X., Song, C. and Lui, H., (2008). Shape-selective Methylation of 2-Methylnaphthalene with Methanol over Hydrothermal Treated HZSM-5 Zeolite Catalysts, Chemical Engineering Science, 63, 5298-5303.
Ayrıntılar
| Birincil Dil | Türkçe |
|---|---|
| Bölüm | Araştırma Makalesi |
| Yazarlar | |
| Yayımlanma Tarihi | 13 Kasım 2015 |
| Yayımlandığı Sayı | Yıl 2015 Cilt: 16 Sayı: 2 |
