Abstract
Ethanolamines are conventionally produced on an industrial scale exclusively by the reaction of ethylene oxide (EO) with an aqueous solution of ammonia. The reaction is a typical consecutive reaction with three steps [NH3 → NH2(CH2OH) → NH(CH2OH)2 → N(CH2OH)3]; therefore, it is difficult to produce diethanolamine with high selectivity. We developed a catalytic process for selective diethanolamine production from EO and anhydrous ammonia using a ZSM-5 zeolite catalyst modified with rare earth elements. This highly active catalyst was able to recognize the difference at molecular level between diethanolamine and triethanolamine. We also succeeded in producing a binderless molded zeolite catalyst having a shape suitable for a fixed-bed reactor. This catalyst does not give problematic impurities due to undesirable reactions over binders. The catalyst deterioration was overcome by developing a regeneration process using high temperature and high-density ammonia gas as a rinse medium.
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Tsuneki, H. Development of Diethanolamine Selective Production Process Using Shape-Selective Zeolite Catalyst. Catal Surv Asia 14, 116–123 (2010). https://doi.org/10.1007/s10563-010-9100-x
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DOI: https://doi.org/10.1007/s10563-010-9100-x