108-49-6Relevant articles and documents
CuCr2O4 derived by the sol-gel method as a highly active and selective catalyst for the conversion of glycerol to 2,6-dimethylpyrazine: A benign and eco-friendly process
Vankudoth, Krishna,Gutta, Naresh,Velisoju, Vijay Kumar,Mutyala, Suresh,Aytam, Hari Padmasri,Akula, Venugopal
, p. 3399 - 3407 (2017)
Vapour phase dehydrocyclization of crude glycerol in conjunction with 1,2-propanediamine (1,2-PDA) was examined over CuCr2O4 obtained by different preparation methods. A high proportion of copper species interacted with Cr2O3 in CuCr2O4 derived from the sol-gel route with a low ratio of Cu2+/Cu0 demonstrating higher dehydrocyclization activity and 2,6-dimethylpyrazine (2,6-DMP) selectivity. X-ray photoelectron spectroscopy analysis of the reduced CuCr2O4 revealed a lower fraction of ionic Cu and a high percentage of metallic Cu in the near surface region. The HCOOH and pyridine adsorbed DRIFT spectra of CuCr2O4 revealed that strong basic and moderate Lewis acid sites are responsible for the selective formation of 2,6-dimethylpyrazine which is consistent with the catalyst poisoning studies on CuCr2O4 co-feeding with pyridine as both Br?nsted and Lewis acid site blocker and 2,6-lutidine as a selective Br?nsted acid site blocker during the dehydrocyclization reaction. The presence of isolated CuO and Cr2O3 species led to a high selectivity for 2,6-dimethylpiperazine. The high intrinsic activity of CuCrsol-gel was also concomitant with the Cu metal surface areas of the catalysts. The fresh, reduced and some of the used catalysts are characterized by BET-surface area, powder XRD, FTIR, XPS, TEM, H2-TPR, TPD of NH3, pyridine, 2,6-dimethylpyridine and HCOOH adsorbed DRIFT spectroscopy.
The invention relates to a propylene glycol and liquid ammonia as raw materials for preparing propylene diamine method and apparatus thereof
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Paragraph 0052-0053; 0089, (2017/08/31)
The invention relates to a method for preparing propane diamine by taking propylene glycol and liquid ammonia as raw materials. Propylene glycol and liquid ammonia are mixed in a certain ratio and are pumped into a reactor by virtue of a pump, and reaction is carried out in presence of a catalyst and hydrogen. The method for preparing the propane diamine by taking the propylene glycol and liquid ammonia as the raw materials has the advantages that a novel catalyst is adopted, catalytic performance is excellent, and long-time operation can be easily carried out; propylene glycol is subjected to hydroamination for producing a propane diamine product at lower reaction pressure, and reaction conditions are adjusted and changed, so that composition of the product can be flexibly adjusted and changed, selectivity of a target product is improved, a reaction process is simple, one-time investment of a production unit and production cost are reduced, a reaction product and a catalyst can be simply separated, and large-scale continuous industrial production can be easily realized.
METHOD FOR PRODUCING AMINES FROM SUGAR ALCOHOLS
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Page/Page column 10, (2010/12/29)
The present invention relates to a process for preparing amines by reacting sugar alcohols with hydrogen and an aminating agent selected from the group of ammonia and primary and secondary amines in the presence of a catalyst at a temperature of from 100° C. to 400° C. and a pressure of from 1 to 40 MPa (from 10 to 400 bar). The catalyst preferably comprises one metal or a plurality of metals or one or more oxygen compounds of the metals of groups 8 and/or 9 and/or 10 and/or 11 of the Periodic Table of the Elements. The sugar alcohol is preferably obtained by hydrogenating the corresponding sugars. The invention further relates to the use of the reaction products as an additive in cement or concrete production and in other fields of use.
