Dissertation > Excellent graduate degree dissertation topics show

Study on Selective Oxidation and Preparation of 4-nitro-o-xylene

Author: WuXiaoJun
Tutor: PengXinHua
School: Nanjing University of Technology and Engineering
Course: Applied Chemistry
Keywords: o-xylene 4-nitro-o-xylene 2-methyl-4-nitrobenzoic acid selective nitration selective oxidation
CLC: TQ241.1
Type: Master's thesis
Year: 2009
Downloads: 198
Quote: 2
Read: Download Dissertation

Abstract


2-Methyl-4-nitrobenzoic acid was prepared by selective nitration and selective oxidation, using o-xylene as starting material.The nitration selectivity of o-xylene using nitric acid in the presence of various catalysts was studied.The experimental results showed that the ratio of 4-nitro-o-xylene was about 45%based on 94%substrate conversion using sulfuric acid as catalyst when theΦvalue of reaction system was 78.Nitration of o-xylene appeared a good para-selectivity with polyphosphoric acid as catalyst compared with that with sulfuric acid.And the reaction conditions such as concentration of phosphoric acid,temperature and so on were discussed. 4-Nitro-o-xylene could be improved to 65%from 45%based on 80%conversion when employing a equal molar ratio of o-xylene / polyphosphoric acid for 6h at 50℃.The characteristics of the selective oxidation of 4-nitro-o-xylene were studied.The oxidation feature of hydrogen peroxide,nitric acid,ferrate,potassium permanganate and sodium hypochlorite was explored.The experimental results showed that potassium permanganate and sodium hypochlorite oxidation were of good para selectivity.Some reaction parameters such as reaction temperature,reaction time,pH,catalysts etc.were discussed.For a neutral system,the yield of 2-methyl-4-nitrobenzoic acid was 55%when using tetrabutylammonium bromide as phase transfer catalyst,potassium permanganate as oxidant and 4-nitro-o-xylene as precursor.And the yield of 2-methyl-4-nitrobenzoic acid was 53%by using sodium hypochlorite oxidizer and tetrabutylammonium bromide as phase transfer catalyst under proper conditions.

Related Dissertations

  1. Enhanced biological trickling filter studies xylene waste gas treatment,X701
  2. Victoria drug basil anti-inflammatory effects of different extracts and its mechanism of,R29
  3. Research on the Prepration of 2, 4 (2,6)-Dimethyl Nitrobenzene by m-Xylene Nitrating,TQ246.1
  4. Separation and Extraction of Rubidium from Deep Brine of Structure Marine of Ping Luo Ba,TS396.5
  5. Study on Preparation of Cyclodextrin-based Molecular Tubes and Performance of Its Pervaporation Membranes,TQ028.8
  6. Pervaporation Separation of Xylene Isomers by Hybrid Membranes of PAAS Filled with Silicalite-1 Zeolite,TQ028.8
  7. Binary Solid-liquid Equilibria of Xylene Isomers,TQ013.1
  8. Study on Degradation of Indoor Hazardous Gases by Modified Titanium Dioxide,TB383.1
  9. Refining of Coking Heavy Oil,TE624.5
  10. The Modeling and Dynamic Simulation of the Xylene Isomerization Reacter,TQ241.13
  11. Controllable Sythesis and Catalytic Property of a-MnO2 Nanoparticles,O643.36
  12. LiFe_ (1-x) M_xPO_4 film composite optical waveguide chemical sensor research,TP212.2
  13. Content Analysis and Release Characteristics of BTEX and Phenol in Sewage Sludge,X703
  14. Synthesis, Characterization and Catalytic Performance of MCM-41-Type Composite Materials,O643.36
  15. The Development of Impact-resistant Polypropylene-poly(Ethylene-propylene) Multiphase Copolymer SP179,TQ325.14
  16. Simultaneous Determination Xylene and Tolualdehyde Isomers by Chemomtrics-HPLC,O621.2
  17. Kinetics Study of the Aerobic Oxidation of p-Xylene Catalyzed by Metalloporphyrin and Cobalt Acetate,TQ245.1
  18. The lithium-ion battery overcharge protection additives,TM912
  19. Study on the Characteristic of Filamentous Bulking Under the Condition of Co-metabolic Biodegradation of Benzene Derivative Pollutants from Regenerated Papermaking Wastewater,X703.1
  20. Research on Synthesis and Catalytic Performance of High Oxidation State Manganese Doped MCM-48 and Enhancement of TiO2 Photocatalytic Activity by Adding GeO2 Powders in Reaction Suspension,O643.36
  21. A Study on Oxidation of Aromatic Side Chain with Nitric Acid,TQ203

CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aromatic compounds > Aromatic hydrocarbons > Single- ring hydrocarbons ( benzene, hydrocarbon )
© 2012 www.DissertationTopic.Net  Mobile