Indexed by:Journal Article

Date of Publication:2003-07-01

Journal:Xiandai Huagong/Modern Chemical Industry

Included Journals:ISTIC、PKU、EI、Scopus

Volume:23

Issue:SUPPL.

Page Number:193-197

ISSN:02534320

Key Words:Catalysis; Organic chemicals; Synthesis (chemical); Zeolites, High silicious zeolite; Monoethanolamine; Selective synthesis; Triethylenediamine, Industrial chemicals

Abstract:The performance of TEDAMAX-01, a kind of catalyst with the topological structure of high silicious zeolite MFI, in catalyzing the reaction of monoethanolamine (MEOA) to triethylenediamine (TEDA) has been evaluated by a small fixed-bed reactor under the ambient pressure and carrier gas free conditions. In order to avoid forming morpholinium compounds as well as pipe-blocking by TEDA, MEOA was co-fed by 18% (wt) of ammonia and 50% (wt) of water. Results show that the activity and the selectivity of TEDAMAX-01 increase notably at reaction temperature in the range of 330-380  C, meanwhile keep stable with weight-hourly-space-velocity (WHSV) of reactant mixture in the range of 1-4 h-1. Under conditions of 370  C and WHSV = 2 h-1, TED AM AX-01 can give approximately 99% conversion under MEOA and more than 97% selectivity to TEDA. During a period of 266 h of continuous operation under these conditions, the conversion of MEOA does not decrease, the selectivity of TEDA decreases slowly before 100 hrs but keeps around 90% thereafter. The recycling of separative mother liquor as the source of feeding ammonia and feeding water, and repetitious regeneration of coked catalyst by the high-temperature calcination for four times seem to have no obvious influence on the activity, selectivity and durability of TEDAMAX-01 catalyst. It is therefore reasonable to expect a promising foreground of commercialization for TEDAMAX-01 catalyst.