Amorphous Ni Alloy Hydrogenation Catalyst and Magnetically Stabilized Bed Reaction Technology

Abstract

A new hydrogenation technology is introduced. This hydrogenation technology includes two new concepts: amorphous Ni alloy and magnetically stabilized bed. Amorphous metal alloys are new kinds of catalytic materials with short-range orderly but long-range disorderly structure. The disadvantages of the amorphous Ni alloy materials in terms of small specific surface area and low thermal stability have been solved to develop these materials into practical catalyst to substitute for the Raney Ni catalyst. The magnetically stabilized bed reactor, a fluidized bed of magnetically stabilized particles by applying a spatially uniform and time-invariant magnetic field oriented axially relative to the fluidizing fluid flow, has many advantages such as the low pressure drop and the high mass transfer efficiency. The cold model tests had revealed that the magnetically stabilized bed reactor displayed three different forms, i.e., the scattered particulates mode, the chain mode and the magnetic condensation mode. The chain mode was conductive to good contact between solid and liquid to promote the catalytic reaction. Two commercial units of the magnetically stabilized bed reactor were set up, with the capacity of 200 and 250 kt/a, respectively. Integration of the amorphous Ni alloy catalyst and the magnetically stabilized bed reactor was developed in the process for purification of caprolactam at RIPP, SINOPEC. The new reaction process has enhanced the hydrogenation reaction to reduce the reaction volume to 1/ 8 and 1/3 of those of kettle-type reactor and the fixed-bed reactor of the same throughput, respectively.

Local heat transfer properties in co- and counter-current G–L–S magnetically stabilized fluidized beds

“…6(b)). It is similar to the conventional three-phase inverse fluidized bed reported by Cho et al (2002), in which h increased with gas velocity (Zong, 2007). As liquid viscosity or surface tension increases, h decreases in the same way as the G-L-S co-current MSFB (see Fig.…”

Synthesis and catalysis of chemically reduced metal–metalloid amorphous alloys

“…One promising reactor type for metal-metalloid amorphous alloy catalysts is the magnetically stabilized-bed (MSB) reactor. 308 This reactor is conductive to good mass and heat transportations, and fine and friable catalyst particles can be used free from high pressure drop. 309 For example, for a skeletal Ni catalysts, the optimal temperature for CO methanation on the MSB reactor was markedly lowered by ca.…”

Selective acetylene hydrogenation over core–shell magnetic Pd‐supported catalysts in a magnetically stabilized bed

“…Three operating regimes comprise the particulate regime, the chain regime, and the magnetically condensed regime, among which the chain regime is superior to provide good heat and mass transfer property and low pressure drop even when the particles are very small. 24,25 Therefore, during the catalytic activity assessment, the MSB reactor was maintained under the chain regime by adjusting the magnetic field intensity as necessary.…”