Process method for preparing 5-chloro-2-pentanone by using micro-channel reactor

Abstract

The invention belongs to the technical field of chemical preparation, and particularly relates to a process method for preparing 5-chloro-2-pentanone by using a micro-channel reactor. According to themethod, a transition cavity is formed in one side of two metering pumps arranged at a micro-channel reactor, the transition cavity comprises a shell, and cut-off cavities are symmetrically formed inthe two ends of the inner wall of the shell. Electromagnets are arranged on the side walls of the inner ends of the cut-off cavities, supporting plates are arranged on one sides of the electromagnets,baffles are arranged on one sides of the supporting plates, stirring fan blades are arranged at the bottom end of the interior of the shell, a motor is installed on the outer wall of one side of thetransition cavity, and the end of the motor is connected with the stirring fan blades through a rotating shaft. According to the method, the transition cavity is formed at outlet pipes of the meteringpumps, so that the transition cavity not only can effectively intercept raw materials and control the reaction ratio of the raw materials, but also can effectively pre-mix the two raw materials in the transition cavity, and then the two raw materials flowing into a reaction channel through a feeding pipe can quickly and fully react.

Description

technical field [0001] The invention belongs to the technical field of chemical preparation, and specifically relates to a process for preparing 5-chloro-2-pentanone with a microchannel reactor. Background technique [0002] 5-chloro-2-pentanone is prepared from 3-acetylpropanol and concentrated hydrochloric acid, because the preparation yield of 5-chloro-2-pentanone is closely related to the flow ratio of acetylpropanol and concentrated hydrochloric acid, In the process of preparation of 5-chloro-2-pentanone, the flow of acetylpropanol and concentrated hydrochloric acid needs to be controlled and proportioned by the metering pump, but the traditional flow pump often does not have a flow cut-off function, and the pump body structure has The only metering pump with accurate cut-off switch function is the peristaltic pump. When the pump wheel stops rotating, the liquid flow is cut off, but the peristaltic pump tube is a vulnerable part. When the pump tube is worn, the metering...

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Problems solved by technology

[0002] 5-chloro-2-pentanone is prepared from 3-acetylpropanol and concentrated hydrochloric acid, because the preparation yield of 5-chloro-2-pentanone is closely related to the flow ratio of acetylpropanol and concentrated hydrochloric acid, In the process of preparation of 5-chloro-2-pentanone, the flow of acetylpropanol and concentrated hydrochloric acid needs to be controlled and proportioned by the metering pump, but the traditional flow pump often does not have a flow cut-off function, and the pump body structure has The only metering pump with accurate cut-off switch function is the peristaltic pump. When the pump wheel stops rotating, the liquid flow is cut off, but the peristaltic pump tube is a vulnerable part. When the pump tube is worn, the metering pump cannot effectively intercept the liquid; and When the two reaction liquids are directly fed into the reaction channel through two flow pumps at the same time, because the two liquids cannot be effectively mixed before flowing, the reaction time and the reaction channel of the two liquids in the flow reaction become longer, which not only increases production The cost also greatly reduces the reaction efficiency, thereby affecting the efficient preparation of 5-chloro-2-pentanone

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