A fully continuous flow synthesis process for 2-methyl-1,4-naphthoquinone

A fully continuous, flow synthesis technology, applied in the chemical field, can solve problems such as unstable product quality, large consumption of oxidant, and low production efficiency, and achieve the effects of shortening the total reaction time, reducing excessive oxidation, and improving production efficiency

Active Publication Date: 2021-04-02
SHANGHAI HYBRID CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0022] Aiming at the shortcomings in the prior art such as unstable product quality, long reaction time, low production efficiency, large consumption of oxidant, many by-products, poor safety, and amplification effect, the problem to be solved by the present invention is to provide a safe, Rapid, efficient, stable, and easy-to-scale-up production of fully continuous flow synthesis process of 2-menadione and a device capable of realizing the process

Method used

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  • A fully continuous flow synthesis process for 2-methyl-1,4-naphthoquinone
  • A fully continuous flow synthesis process for 2-methyl-1,4-naphthoquinone
  • A fully continuous flow synthesis process for 2-methyl-1,4-naphthoquinone

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Embodiment 1#~12#

[0097] The molten 2-methylnaphthalene and emulsifier solution are emulsified by a constant flow feed pump. The "dynamic" milk flow after emulsification enters the continuous flow reactor directly without stopping. Sodium dichromate solution and a stream of sulfuric acid solution are also fed into the reactor 2-methylnaphthalene through a constant flow feed pump to react. Emulsification time is RT e , the reaction temperature is T, and the oxidation reaction time is RT r . The formula for calculating the total reaction time is: RT=RT e +RT r .

[0098] where emulsification time RT e The calculation formula is

[0099]

[0100] Oxidation reaction time RT r The calculation formula is similar to the emulsification time calculation.

[0101] Concrete embodiment condition and result are shown in the following table.

[0102]

[0103]

Embodiment 13

[0104] Embodiment 13#~18#

[0105] The molten 2-methylnaphthalene and emulsifier solution are emulsified by a constant flow feed pump. The difference from Examples 1# to 12# is that the sulfuric acid solution is divided into three streams with different concentrations and different flow rates, and the sulfuric acid solution is pumped into different positions of the reactor. The temperature from the first addition of sulfuric acid solution to the second addition of sulfuric acid solution is set as T 1 , the reaction time is RT r1 , the temperature between the addition of sulfuric acid solution for the second time and the addition of sulfuric acid solution for the third time is set to T 2 , the reaction time is Rt r2 , the temperature between the third time sulfuric acid solution is added to the outlet is set to T 3 , the reaction time is RT r3 , the total reaction time is RT, and the calculation formula is RT=RT e +RT r1 +RT r2 +RT r3 . The calculation principle of ea...

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Abstract

The present invention relates to a fully continuous flow synthesis process for use with 2-methyl-1,4-naphthoquinone and an integrated continuous flow reactor for use in achieving said process; the synthesis process uses 2-methylnaphthalene, an emulsifier solution, a sodium dichromate solution and a sulfuric acid solution as raw materials, and the synthesis process is carried out in the integrated continuous flow reactor; the 2-methylnaphthalene, the emulsifier solution, the sodium dichromate solution and the sulfuric acid solution are continuously added to a feeding port of the integrated continuous flow reactor to continuously undergo a transient emulsification process and an oxidation process, and 2-methyl-1,4-naphthoquinone is continuously obtained from a discharging port of the integrated continuous flow reactor; the reaction time is equal to or less than 700 s. The process is a continuous synthesis process for use with 2-methyl-1,4-naphthoquinone which is fast, safe, efficient, versatile, and easy to produce on a large scale.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a fully continuous flow synthesis process for 2-methyl-1,4-naphthoquinone. Background technique [0002] 2-methyl-1,4-naphthoquinone, referred to as β-menadione or 2-menaquinone, is a fat-soluble vitamin and a key intermediate for the synthesis of K-series vitamins. 2-Menadione has a wide range of applications, and is widely used in clinical, agriculture, forestry, coatings and other fields. It is difficult to extract natural 2-menadione, so currently 2-menaquinone mainly depends on artificial synthesis. There are many methods for chemically synthesizing 2-menaquinone: gas phase oxidation, chemical oxidation, etc. The gas-phase oxidation method uses air to oxidize 2-methylnaphthalene in a gaseous state, and the yield of the product is low and there are many impurities. The chemical oxidation method mainly includes the hydrogen peroxide method and the chromium salt method according to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C46/02C07C50/12
CPCC07C46/02C07C50/12C07C46/04C07C50/10
Inventor 马兵马陈雷刘学潘帅
Owner SHANGHAI HYBRID CHEM TECH
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