Green tea drying in a closed cycle continuous vibro fluidized bed dryer with dehumidified air

  • Sri Utami Handayani Industrial Technology Department, Vocational School, Diponegoro University, Semarang, Prof Soedarto Street, Semarang, Indonesia
  • Eflita Yohana Mechanical Engineering Department, Diponegoro University, Semarang, Prof Soedarto Street, Semarang, Indonesia
  • Mohamad Tauviqirrahman Mechanical Engineering Department, Diponegoro University, Semarang, Prof Soedarto Street, Semarang, Indonesia
  • Mohamad Endy Yulianto Industrial Technology Department, Vocational School, Diponegoro University, Semarang, Prof Soedarto Street, Semarang, Indonesia
  • Mochamad Murni Industrial Technology Department, Vocational School, Diponegoro University, Semarang, Prof Soedarto Street, Semarang, Indonesia
Keywords: Drying, Tea, Vibro Fluidized Bed Dryer, Zeolite

Abstract

There is potential for the development of zeolite as an adsorbent material for drying high-value items. This study aims to compare the green tea drying characteristic utilizing vibro-fluidized bed dryers that operate without dehumidification and with dehumidification. The research was carried out experimentally. The drying chamber was set at temperatures of 50oC, 60oC, and 70oC. In the drying with dehumidification setup, zeolite was placed in a dehumidifier with a weight-to-tea leaf ratio of 1:2.86, 1:3.33, 1:4, and 1:5. The results showed that zeolite's impact on decreasing drying time is effective at a specific temperature, in this case is 60oC. The effect is negligible at low temperatures (50oC), while at high temperatures (70oC) it is minor and drying time is primarily influenced by temperature. Utilizing zeolite for dehumidification can enhance the rate of drying during the falling rate period.

References

Ahmed, S. and Stepp, J.R., 2013. Green tea : The plants, processing, manufacturing and production. Tea in Health and Disease Prevention, pp. 19-31, Academic Press

Asiah, N., Djaeni, M. and Hii, C.L., 2017. "Moisture transport mechanism and drying kinetic of fresh harvested red onion bulbs under dehumidified air." Int. J. Food Eng. 13 (9), 20160401.

Atuonwu, J.C., Straten, G. Van and Deventer, H.C., Boxtel, A., 2011. "Optimizing Energy efficiency in low temperature drying by zeolite adsorption and process integration." Journal of Chemical Engineering Transactions 25, 111–116.

Djaeni, M., Bartels, P., Sanders, J., Straten, G. van, & Boxtel, A. J. B. van, 2007. "Process integration for food drying with air dehumidified by zeolites." Drying Technol. 25(1), 225–239

Djaeni, M., Bartels, P. V., van Asselt, C. J., Sanders, J. P. M., van Straten, G., & van Boxtel, A. J. B., 2009." Assessment of a two-stage zeolite dryer for energy-efficient drying." Drying Technol. 27(11), 1205–1216

Djaeni, M., Kurniasari, L., Purbasari, A., Sasongko, S., 2010. "Activation of natural zeolite as water adsorbent for mixed-adsorption drying." Proceeding of the 1 st International Conference on Materials Engineering (ICME) and 3rd AUN/SEED-Net Regional Conference on Materials (RCM) 25-26 November 2010, Yogyakarta, Indonesia

Djaeni, M., Aishah, N.A., Nissaulfasha, H., Buchori, L., 2013. "Corn drying with zeolite in the fluidized bed dryer under medium temperature.” The Journal for Technology and Science 24(2), 13–18.

Djaeni, M., Ayuningtyas, D., Asiah, N., Hargono, H., Ratnawati, R., Wiratno, W., Jumali, J., 2013. "Paddy drying in mixed adsorption dryer with zeolite: drying rate and time estimation." Reaktor 14(3), 173–178.

Djaeni, M., Anggoro, D., Santoso, G.W., Agustina, D., Asiah, N., Hii, C.L., 2014. "Enhancing the food product drying with air dehumidified by zeolite’, Adv. J. Food Sci. Technol. 6(7), 833–838.

Djaeni, M., Utari, F.D., Sasongko, S.B., Kumoro, A.C., 2017. "Evaluation of food drying with air dehumidification system: A short review.” IOP Conf. Ser.: Earth Environ. Sci. 102, 012069

Djaeni, M. and Sari, D.A., 2015. "Low temperature seaweed drying using dehumidified air." Procedia Environ. Sci. 23, 2–10.

Djaeni, M., Sasongko, S.B., Prasetyaningrum, A., Jin, X., Boxtel, A. J. van, 2012. "Carrageenan drying with dehumidified air : Drying characteristics and product quality." Int. J. Food Eng. 8 (3), 2012.

Evin, D., 2012. "Thin layer drying kinetics of Gundelia tournefortii L.’, Food Bioprod. Process. 90(2), 323–332.

Giri, S.K. and Prasad, S., 2007. "Drying kinetics and rehydration characteristics of microwave-vacuum and convective hot-air dried mushrooms." J. Food Eng. 78(2), 512–521.

Handayani, S.U., Yulianto, M.E. and Paramita, V. 2015. "Efficacy of Zeolite Adsorption on the Green Tea Production by Fluidized Bed Dryer", Research Journal of Applied Sciences, Engineering and Technology, 9(12), 1128–1131

Kurniasari, L., Djaeni, M. and Purbasari, A., 2011. "Aktivasi zeolit alam sebagai adsorben pada alat pengering bersuhu rendah." Reaktor 13(3), 178-184.

Majumder, P., Deb, B. and Gupta, R., 2022. "Design and development of solar assisted fluidized bed dryer integrated with liquid desiccant dehumidifier: Theoretical analysis and experimental investigation." Energy Convers. Manage. 270, 116281.

Pastoriza, S., Mesías, M., Cabrera, C., Rufián-Henares, J. A., 2017. "Healthy properties of green and white teas: An update." Food Funct. 8(8), 2650–2662.

Perazzini, H., Bentes, F. and Teixeira, J., 2017. "The influence of vibrational acceleration on drying kinetics in vibro-fluidized bed." Chem. Eng. Process. : Process Intensification 118,124–130.

Reygaert, W., 2017. "An update on the health benefits of green tea’, Beverages, 3(4), 6.

Vega, M. De and Briongos, J. V., 2012. "A novel methodology for simulating vibrated fluidized beds using two-fluid models." Chem. Eng. J. 198–199, 261–274.

Yang, Y., Chen, J., Jiang, Y., Qian, M. C., Deng, Y., Xie, J., Li, J., Wang, J., Dong, C., Yuan, H., 2022. "Aroma dynamic characteristics during the drying process of green tea by gas phase electronic nose and gas chromatography-ion mobility spectrometry." LWT 154, 112691.

Zhang, Y., Li, Y., Dong, L., Zhao, Y., Gao, Z., Duan, C., Liu, Q., Yang., X., 2018. "Characterization of temporal and spatial distribution of bed density in vibrated gas-solid fluidized bed." Adv. Powder Technol. 29(11), 2591–2600.

Published
2024-04-30
How to Cite
Handayani, S. U., Yohana, E., Tauviqirrahman, M., Yulianto, M. E., & Murni, M. (2024). Green tea drying in a closed cycle continuous vibro fluidized bed dryer with dehumidified air. ASEAN Journal of Chemical Engineering, 24(1), 1-9. https://doi.org/10.22146/ajche.8407
Section
Articles