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Method for preparing propionate by means of microreactor

A technology of micro-reactor and propionate, which is applied in the direction of chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., can solve the problems of three wastes in the reaction process, serious corrosion, long reaction time, etc., and achieve shortening The effect of high production cycle, high conversion rate and uniformity

Inactive Publication Date: 2018-12-18
ZHANGJIAGANG HICOMER CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is mature, but has the following defects: severe corrosion, easy to cause side reactions, many wastes in the reaction process, and serious pollution to the environment
But this preparation method still has following defect: reaction time is long, needs 4~12 hours, and energy consumption is high

Method used

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  • Method for preparing propionate by means of microreactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Reaction raw materials: 74 g (1 mol) of propionic acid, 38.4 g (1.2 mol) of methanol, 0.22 g of bisfluorosulfonimide imidazolium salt as an acidic ionic liquid catalyst (accounting for 0.2% of the total mass of the reaction raw materials).

[0024] Propionic acid and methanol are pumped into the first blender 4 through the first metering pump 1 and the second metering pump 2 respectively, and bisfluorosulfonimide imidazolium salt is pumped into the second blender 5 through the third metering pump 3 middle. The liquid in the first blender 4 and the second blender 5 enters the microreactor 7, and reacts at a temperature of 50° C. for 10 minutes. Sampling and monitoring is carried out from the sampling end of the sampling stop valve 81. The alcohol content is 0.02%, and the reaction is determined. Finish. Open the sampling shut-off valve 81, the material in the microreactor 7 enters in the filter 9 through the material output pipe 8, separates the water layer and the orga...

Embodiment 2

[0026] Reaction raw materials: 74g (1mol) of propionic acid, 69.10g (1.5mol) of ethanol, 0.36g of bisfluorosulfonimide imidazolium salt as an acidic ionic liquid catalyst (accounting for 0.25% of the total mass of the reaction raw materials).

[0027]Propionic acid and ethanol are pumped into the first blender 4 through the first metering pump 1 and the second metering pump 2 respectively, and bisfluorosulfonimide imidazolium salt is pumped into the second blender 5 through the third metering pump 3 middle. The liquid in the first blender 4 and the second blender 5 enters the microreactor 7, and the temperature is controlled at 60°C to react for 40 minutes, and the sample is monitored from the sampling end of the sampling stop valve 81. The alcohol content is 0.04%, and the reaction is determined. Finish. Open the sampling shut-off valve 81, the material in the microreactor 7 enters in the filter 9 through the material output pipe 8, separates the water layer and the organic ...

Embodiment 3

[0029] Reaction raw materials: 74g (1mol) of propionic acid, 78g (1.3mol) of propanol, 0.46g of bisfluorosulfonimide imidazolium salt as an acidic ionic liquid catalyst (accounting for 0.3% of the total mass of the reaction raw materials).

[0030] Propionic acid and propanol are pumped into the first blender 4 through the first metering pump 1 and the second metering pump 2 respectively, and bisfluorosulfonimide imidazolium salt is pumped into the second blender through the third metering pump 3 5 in. The liquid in the first blender 4 and the second blender 5 enters the microreactor 7, and reacts at a temperature of 55°C for 60 minutes. Sampling and monitoring is carried out from the sampling end of the sampling stop valve 81. The alcohol content is 0.03%, and the reaction is determined. Finish. Open the sampling shut-off valve 81, the material in the microreactor 7 enters in the filter 9 through the material output pipe 8, separates the water layer and the organic layer in ...

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Abstract

The invention discloses a method for preparing propionate by means of a microreactor. Production equipment comprises a first metering pump, a second metering pump and a third metering pump, wherein the first metering pump and the second metering pump are communicated with a first blender, the third metering pump is communicated with a second blender, the blenders are communicated with the microreactor, a material output pipe with a sampling stop valve is arranged at a discharging end of the microreactor, the material output pipe is connected with a filter, a drainage pipe and a discharging pipe are connected with an output end of the filter in parallel, the discharging pipe is connected with a rectifying tower, and an output pipe of the rectifying tower is connected with a dehydration tank; a preparation process comprises the steps that propionic acid and monohydric alcohol are pumped by the first metering pump and the second metering pump respectively, an acidic ion liquid catalyst ispumped by the third metering pump, a reaction temperature is controlled to be 50 to 100 DEG C, and reaction time is controlled to be 5 to 60 min. The method for preparing the propionate by means of the microreactor has the advantages that the material diffusion speed can be further improved, the evenness of material mixing is further improved, the reaction time and a production cycle are greatlyshortened, energy consumption is low, and the conversion rate is high.

Description

technical field [0001] The invention relates to the technical field of preparation of propionate, in particular to a method for preparing propionate using a microreactor. Background technique [0002] Safety, cleanliness, high efficiency, energy saving and sustainability are the development trends of the chemical industry in the 21st century. Micro-reactor is a new technology to achieve green synthesis through process intensification. Compared with traditional batch reaction process, it has rapid mixing, high-efficiency heat transfer, narrow residence time distribution, good repeatability, rapid system response and easy automation. Control, almost no amplification effect and high safety performance, so it has become one of the common research hotspots in scientific research institutions and business circles. A microchannel module is arranged in the microreactor, and a microchannel is arranged in the microchannel module. [0003] Propionate is an important organic compound,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/24
CPCC07C67/08C07C69/24
Inventor 戴江英庞宝华许国荣赵建翟香珍田美丽
Owner ZHANGJIAGANG HICOMER CHEM CO LTD
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