Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (1): 117-122.DOI: 10.11944/j.issn.1000-0518.2020.01.190160

• Full Papers • Previous Articles    

Wastewater Treatment and Recycle of Zinc Chloride in 1,2,3,9-Tetrahydro-4H-carbazol-4-one Production Process

LIU Xide,ZHOU Di(),ZHANG Zhaoshun   

  1. School of Chemistry and Chemical Engineering,Qufu Normal University,Qufu,Shandong 273165,China
  • Received:2019-05-30 Accepted:2019-05-30 Published:2020-01-08 Online:2020-01-08
  • Contact: ZHOU Di
  • Supported by:
    Supported by the National Natural Science Foundation of China(No. 21506114), and the Scientific Research Foundation of Qufu Normal University(No.BSQD20130116)

Abstract:

A large amount of wastewater in the production process of 1,2,3,9-tetrahydrocarbazol-4-one is generated and leads to severe harm. In this work, the effects and existing problems in oxidation treatment were investigated. Meanwhile, the new process route of high-temperature carbonization treatment was developed. The results show that the oxidation treatments with NaClO and H2O2 fail to achieve the desired effect, and the recycled solid is poor in color and has no catalytic activity. However, zinc chloride recovered through distilling at 143 ℃ and high-temperature carbonization at 500 ℃ for 40 min, exhibits excellent catalytic activity, which makes the conversion of monophenylhydrazone reach 52.6%. Ultimately, the reclamation of zinc chloride in the production of 1,2,3,9-tetrahydrocarbazol-4-one is realized. At the same time, the experimental results provide a new way for the treatment of 1,2,3,9-tetrahydrocarbazol-4-one production wastewater and comprehensive utilization of resources.

Key words: 1,2,3,9-tetrahydro-4H-carbazol, oxidation treatment, high-temperature carbonization, zinc chloride