43 results about "Chemical reaction engineering" patented technology

The invention discloses a novel Beckmann rearrangement method for preparing caprolactam from cyclohexanone oxime, and belongs to the technical field of chemical reaction engineering. The method comprises the following steps of: by using high-efficiency mixing and excellent mass transfer and heat transfer properties of a microreactor, using fuming sulphuric acid as a dispersed phase in a first microreactor, dissolving the cyclohexanone oxime in an inert solvent to serve as a continuous phase, mixing the two phases and initiating an rearrangement reaction; taking the cured reaction mixture as acontinuous phase, introducing the continuous phase into a second microreactor, mixing with the introduced water serving as the dispersed phase, performing hydrolysis reaction to obtain caprolactam-containing aqueous solution, and circulating the inert solvent back to the system. The method only needs the reaction time of 10 to 40 seconds in a large acid oxime ratio of 0.8 to 3.0, namely can achieve high conversion rate of over 99.9 percent and high selectivity of over 99.9 percent, and has the advantages of high operational flexibility, low operating cost, high safety and controllability, high production efficiency, and capacity of greatly reducing the yield of a byproduct ammonium sulfate.