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Journal of Flow Chemistry

, Volume 8, Issue 3–4, pp 139–146 | Cite as

Continuous diazotization of aromatic amines with high acid and sodium nitrite concentrations in microreactors

  • Yang Liu
  • Changfeng Zeng
  • Chongqing Wang
  • Lixiong ZhangEmail author
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Abstract

We design a new continuous diazotization microreaction process in which concentrated acid and sodium nitrite solutions are used. We form oil in water (O/W) microdroplets by mixing amine with sodium nitrite aqueous solution, which react with mineral acid to make the diazotization. In this way, the formed particles are dispersed in the aqueous phase, which can flow with the main stream, and consequently are consumed. Then the fluid can smoothly flow without clogging in the microchannels and we can achieve continuous operation. We use aniline, o-methylaniline, m-methylaniline, and o-ethylaniline as the raw materials, 6 M HCl and 6.5 M H2SO4 as the acid as well as sodium nitrite to demonstrate the feasibility. The resulting diazonium salts are converted to iodo-substitute aromatic compounds to measure the yield. The results show that, SIMM-V2 micromixer is efficient to form the emulsion. Mixing the microdroplets with acid in a co-axial flow way can prevent clogging. In hydrochloric acid medium, high reaction yield can be obtained when the reaction temperature is 4 °C and the residence time is 13–15 s. In sulfuric acid medium, high conversion of aromatic amine of up to 99% and yield of approximately 90% can be achieved at the reaction temperature of 9 °C and the residence time of 14–16 s. This process provides efficient continuous diazotization reactions using concentrated acid and sodium nitrite solutions, minimizing the production of waste water.

Keywords

Diazotization O/W microdroplets Clogging Microreactor 

Notes

Acknowledgements

We are grateful for financial support from the National Science and Technology Support Program of China (2015BAD15B07), and Priority Academic Program Development of Jiangsu Higher Education Institutions.

Supplementary material

41981_2018_18_MOESM1_ESM.docx (21 kb)
ESM 1 (DOCX 21 kb)

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Copyright information

© Akadémiai Kiadó 2018

Authors and Affiliations

  • Yang Liu
    • 1
  • Changfeng Zeng
    • 2
  • Chongqing Wang
    • 1
  • Lixiong Zhang
    • 1
    Email author
  1. 1.State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemical EngineeringNanjing Tech UniversityNanjingPeople’s Republic of China
  2. 2.College of Mechanical and Power EngineeringNanjing Tech UniversityNanjingPeople’s Republic of China

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