System and process for continuous synthesis of 3-(n,n-dimethylamino)-n,n-dimethylpropionamide without catalyst

A technology of dimethylpropionamide and dimethylamino, which is applied in the system and process field of catalyst-free continuous synthesis of 3-(N,N-dimethylamino)-N,N-dimethylpropionamide, and can solve the problem of reaction Long time, equipment corrosion, unstable energy consumption and other problems, to achieve the effect of reducing the amount of by-products and the loss of dimethylamine, reducing the generation of side reactions, and increasing the reaction rate

Active Publication Date: 2022-07-26
山东瑞博龙化工科技股份有限公司
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  • Abstract
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Problems solved by technology

[0007] After research by the inventors, it has been found that most of the synthesis procedures of DMDMAA currently use a kettle-type batch process, which has a long reaction time, frequent open operations, unstable energy consumption, and the salt solid waste generated after catalytic neutralization is very easy Corrosion of equipment

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  • System and process for continuous synthesis of 3-(n,n-dimethylamino)-n,n-dimethylpropionamide without catalyst
  • System and process for continuous synthesis of 3-(n,n-dimethylamino)-n,n-dimethylpropionamide without catalyst

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[0034] The third embodiment of the present invention provides a process for the continuous synthesis of 3-(N,N-dimethylamino)-N,N-dimethylpropionamide without catalyst, and provides the above-mentioned continuous synthesis of 3-(N,N-dimethylamino) without catalyst. N,N-dimethylamino)-N,N-dimethylpropionamide system, methyl acrylate and dimethylamine enter the plate heat exchanger and heat to 10~50℃ for reaction, and then enter the buffer storage tank for buffering , enter the pipeline reactor through the material pump for continuous reaction, and the temperature and pressure in the pipeline reactor are respectively adjusted to 180-260°C and 5.5-15MPa.

[0035] The residence time in the pipeline reactor affects the conversion rate of methyl 3-(N,N-dimethylamino)propionate. The longer the residence time, the higher the conversion rate of methyl 3-(N,N-dimethylamino)propionate. , the residence time of the present invention is 104-160min.

[0036] In some embodiments of this embo...

Embodiment

[0044] A system for the continuous synthesis of 3-(N,N-dimethylamino)-N,N-dimethylpropionamide without catalyst, such as figure 1 As shown, according to the material flow direction, it includes a plate heat exchanger 3, a buffer storage tank 4, an addition product mixing pump 5, a pipeline reactor 6, a cooler 7, and a product storage tank 8. The material inlet of the plate heat exchanger 3 is connected to the dimethylamine pump 1 and the methyl acrylate pump 2 at the same time.

[0045] Among them, the liquid holding capacity of the plate heat exchanger is 2100ml. The pipeline reactor is a pipeline reactor with a pipeline outer diameter of 6 mm, a wall thickness of 1 mm and a length of 1000 m. The pipeline reactor includes an outer shell and an inner coil. The outer shell is mainly used to heat the heat medium to provide heat for the inner coil. The inner coil is used as a material reaction container. The coil rises in a spiral shape to ensure compliance with the minimum bend...

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Abstract

The invention discloses a system and a process for catalyst-free continuous synthesis of 3-(N,N-dimethylamino)-N,N-dimethylpropionamide. The system comprises a plate heat exchanger, a buffer storage tank, a Pump and pipeline reactor; the material inlet of the plate heat exchanger is connected to the material main line, and the material main line is used to connect the methyl acrylate source and the dimethylamine source. The process is as follows: methyl acrylate and dimethylamine enter the plate heat exchanger and heat to 10-50 °C for reaction, then enter the buffer storage tank for buffering, and enter the pipeline reactor through the material pump for continuous reaction. The temperature and pressure were adjusted to 180 to 260° C. and 5.5 to 15 MPa, respectively. The process of the invention does not need a catalyst to avoid the generation of salt solid waste, and realizes the continuous production and can shorten the reaction time.

Description

technical field [0001] The invention relates to a system and a process for continuously synthesizing 3-(N,N-dimethylamino)-N,N-dimethylpropionamide without catalyst. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] N,N-Dimethacrylamide (DMAA) is a new type of acrylamide monomer with broad application prospects. It is an important fine organic chemical raw material. The active double bond in the molecule makes it easy to self-polymerize or Copolymerized with other monomers, because DMAA copolymers or self-polymers have excellent hygroscopicity, antistatic properties, dispersibility, compatibility and adhesion properties, they can be widely used in chemical fibers, plastics...

Claims

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Application Information

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IPC IPC(8): C07C237/06C07C231/02C07C227/08C07C229/12
CPCC07C231/02C07C227/08C07C237/06C07C229/12
Inventor 郑万强穆佃鹏王红乐暴巧晟董德文国凤玲姚慧玲
Owner 山东瑞博龙化工科技股份有限公司
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