Preparation method and application of framework Co catalyst

Abstract

The invention discloses a preparation method and application of a framework Co catalyst. The method specially comprises the following steps of preparing Co-Al alloys through smelting, then crushing the Co-Al alloys into alloy powder, and then adding an organic binder, a lubricant, a high-temperature adhesive and a special adhesive; and performing shaping, performing drying, performing roasting, performing activation and performing post treatment, so as to obtain the catalyst. The catalyst is used for hydrogenation of 3-(aminomethyl)-3,5,5-trimethylcyclohexanamine (IPN) so as to prepare isophorone diamine(IPDA), wherein the conversion rate of IPN is as high as 100%, and the selectivity of the IPDA is as high as 98% or above.

Description

Technical field: [0001] The invention relates to a preparation method and application of a skeleton Co catalyst, which can be used as a fixed bed to prepare 3-aminomethyl-3,5, Hydrogenation catalyst for 5-trimethylcyclohexylamine. Background technique: [0002] 3-Aminomethyl-3,5,5-trimethylcyclohexylamine (isophoronediamine, referred to as IPDA) is a raw material for preparing isophorone diisocyanate (IPDI), polyamide, etc.; it can also be used as Epoxy resin curing agent. It is usually composed of 3-cyano-3,5,5-trimethylcyclohexanone (isophorone nitrile, referred to as IPN), NH 3 and H 2 Under the action of a hydrogenation catalyst, it can be obtained through ammoniation and high-pressure hydrogenation. Commonly used hydrogenation catalysts are skeleton Co (Raney Co) catalysts. [0003] Raney Co catalyst is a commercial catalyst. Such as U.S. published patent documents US6087296A, US7569513 etc. disclose its preparation method as follows: take metal Co and Al as the a...

AI Technical Summary

Problems solved by technology

Among them, US6337300 discloses using 15% polyoxymethylene copolymer as a binder, molding Co-Al alloy powder, drying, and roasting at 800 ° C for 125 min, and then using 20 % NaOH solution to activate at 80 ° C for 120 min The catalyst is prepared; the catalyst is used for the hydrogenation of IPN to prepare IPDA, the IPN conversion rate is 99.9%, but the IPDA selectivity is only 89.7%, the product yield is low, and the particle crushing strength (Breaking Strength) is only 120N / particle

[0009] Therefore, it is necessary to seek a new preparation method of the skeleton Co catalyst, so as to solve the problem of low yield of the target alloy particles due to the crushing of the alloy block and serious waste of the alloy; the strength of the catalyst formed by the alloy powder is poor, and the active components are easily lost; 2 Or AlOOH is easy to remain in the pores of the catalyst, causing problems such as many side reactions during use