Process for producing phosphate catalyst for producing triethylene diamine

Application Number: 00108933
Application Date: 2000.05.22
Publication Number: 1277075
Publication Date: 2000.12.20
Priority Information: 1999/5/21 US 09/316609
International: B01J27/18;C07D487/10
Applicant(s) Name: Air Products and Chemicals, Inc.
Inventor(s) Name: Li Hongxin;L. A. Imig;R. P. Udwood
Patent Agency Code: 72001
Patent Agent: lu xinhua
Abstract A new method of making phosphate-based catalysts by mixing phosphoric acid with a substantially water insoluble alkaline earth metal salt such that the phosphorus to alkaline earth metal molar ratio is less than 1. The product, containing alkaline earth metal hydrogen phosphate and the starting alkaline earth metal salt, is filtered and dried. The product can be used as a catalyst in the production of triethylenediamine from, for example, mono- and di-substituted piperazines, such as hydroxyethylpiperazine and aminoethylpiperazine, ethanolamines and substituted ethanolamines, and crude hydroxyethylpiperazine containing piperazine, hydroxyethylpiperazine, bis-hydroxyethylpiperazine, and water.