Production of Ethylene Glycol Diacetate Ester Using a Heterogeneous Titanium (IV) Isopropoxide Catalyst: Response Surface Methodology

Journal of Applied Chemical Research

دوره 17، شماره 1، فروردین 2023، صفحه 21-36   

نوع مقاله: Original Article

نویسندگان

Borna Bayat¹؛ Kambiz Tahvildari^{* 1}؛ Amin Bazyari²؛ Alireza Hemmati^{* 3}

¹Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran

²Catalysis and Nanomaterials Research Laboratory, School of Chemical, Petroleum, and Gas Engineering, Iran, University of Science and Technology, Tehran, Iran

³School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran

چکیده

In this study, the reactive batch distillation of ethylene glycol monoacetate (EGMA) and ethylene 
glycol  diacetate  (EGDA)  was  investigated  experimentally  and  numerically  via  the  esterification 
reaction  of  acetic  acid  (AA)  and  monoethylene  glycol  (MEG)  in  the  presence  of  heterogeneous 
titanium  (IV)  isopropoxide  catalyst.  Four  operating  parameters,  including  time  (4-12  hr), 
temperature (60-100°C), the molar ratio of acetic acid to ethylene glycol (0.4-2.2 M), and catalyst 
weight (1-5wt%), were selected to design experiments, model and optimize the process through the 
response surface methodology (RSM). By applying the central composite design (CCD) method in 
RSM, two linear and second-order models were proposed for the responses of MEG conversion and 
EGD selectivity. The response surface plots showed that the reaction temperature and time had a 
more  significant  effect  on  increasing  the  reaction  yield,  while  the  molar  ratio  of  reactants  and 
catalyst  weight  were  two  critical  parameters  in  increasing  selectivity.  The  results  of  process 
optimization to maximize the responses indicated that the optimum process point in the operating 
range was at 9.5 hr, the temperature of 90°C, the molar ratio of 2.92:1, and catalyst weight of 2wt% 
where  the  predicted MEG  conversion  and  selectivity  were  100%  and  94.72%,  respectively. The 
MEG conversion reduced from 91.1% to 56.7% after using the catalyst four times. 

کلیدواژه‌ها

Ethylene  glycol  diacetate؛  Acetic  acid؛  Ethylene  glycol؛  Batch  reactive  distillation؛  Response surface methodology

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