Continuous synthesis method and device of amion-2,2,6,6-tetramentylniperidine

A technology for the synthesis of tetramethylpiperidinamine, which is applied in the field of synthesis of tetramethylpiperidinamine, can solve the problems of increasing the post-treatment process of organic solvents, the large proportion of organic solvents, and complicated operation processes, so as to shorten the production cycle , Reaction efficiency improvement, high mixing efficiency effect

Pending Publication Date: 2019-10-11
宿迁联盛科技股份有限公司
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Problems solved by technology

However, the post-treatment process of organic solvents is added, which increases the cost, and the proportion of organic solvents is too large, which reduces the output of each batch
The commonly used methods all affect the quality of the product to a certain extent, and the whole operation process is relatively complicated. Therefore, a new solution is urgently needed to solve the above technical problems

Method used

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  • Continuous synthesis method and device of amion-2,2,6,6-tetramentylniperidine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: see figure 1 , a continuous synthetic method of tetramethylpiperidinamine, the synthetic method comprises the following steps: taking triacetone amine as raw material, adding a catalyst, feeding ammonia gas, reacting in the first channel 2 of the microchannel, the temperature is 50~ 150°C, time 5~300s, pressure 0.3~3Mpa, pass hydrogen gas into the second channel 5 of the microchannel, the temperature of hydrogen intake is 50~150°C, time 10~300s, pressure 0.3~3Mpa, the obtained reaction liquid passes through the gas After the liquid is separated, it enters the rectification tower for rectification to obtain the finished product. In this solution, preferably, the temperature in the first channel is 50-80°C, the time is 10-60s, the pressure is 0.5-2Mpa, the temperature in the second channel is 70-120°C, the time is 20-150s, Pressure 0.5~2Mpa. The method adopts a microchannel reactor, which occupies a small area and has few potential safety hazards. In addit...

Embodiment 2

[0019] Example 2: see figure 1 , a tetramethylpiperidinamine continuous synthesis device, the synthesis device includes a microchannel reactor 3, a gas-liquid splitter 8, a storage tank 9 and a rectification tower 10, the microchannel reactor is provided with micro Channel first channel 2 and microchannel second channel 5, a pressure reducing valve 6 and a throttle valve 7 are arranged between the microchannel reactor 3 and the gas-liquid separator 8, and the storage tank 9 is arranged on the gas-liquid separator Between the gas-liquid separator and the rectification tower, there is an online hydrogen detector and a liquid level linkage pump at the outlet of the gas-liquid separator. The first channel of the microchannel is a straight micropore to completely react the triacetone amine and ammonia. The aperture is 0.1~20mm, and the tube length is 10~100m. Preferably, the pore diameter of the first channel is 0.5-10mm, the tube length is 20-60m, and the second channel of the mi...

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Abstract

The invention relates to a continuous synthesis method of amion-2,2,6,6-tetramentylniperidine. The method includes the following steps that triacetylamine is used as a raw material, a catalyst is added, and ammonia gas is introduced for reaction at a first channel 2 of a microchannel for 5-300 seconds at the temperature of 50-150 DEG C and the pressure of 0.3-3 Mpa; hydrogen is introduced at a second channel 2 of the microchannel, the hydrogenation temperature is 50-150 DEG C, and hydrogenation lasts for 10-300 seconds at the pressure of 0.3-3 Mpa. After gas-liquid separation, the obtained reaction liquid enters a distillation tower for distillation to obtain the finished product. According to the technical scheme, a microchannel reactor is used for hydrogenation, the shortcomings of the prior art is overcome and a safer and more convenient production way is provided.

Description

technical field [0001] The invention relates to a continuous synthesis method of tetramethylpiperidinamine, which belongs to the technical field of synthesis of tetramethylpiperidinamine. Background technique [0002] At present, there are mainly two types of synthetic methods for tetramethylpiperidinamine. One is to synthesize tetramethylpiperidinamine at a certain temperature and pressure with about 32% ammonia water as a solvent and framework nickel or framework cobalt as a catalyst in a high-pressure reactor. Methylpiperidinamine, the content is about 92%. The water content in the reaction solution of this method is relatively high, resulting in a high content of the by-product tetramethylpiperidinol, and the tetramethylpiperidinamine and water azeotrope, the post-treatment is more complicated . [0003] The other is to use a low-carbon alcohol or a mixture of low-carbon alcohol and water as a solvent in a high-pressure reactor, introduce ammonia and hydrogen, and synth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D211/58
CPCC07D211/58
Inventor 祝君威俞秀丽胡新利娄凯
Owner 宿迁联盛科技股份有限公司
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