Dissertation > Excellent graduate degree dissertation topics show

Study on the Synthesis of Diphenyl Carbonate by the Oxidative Carbonylation of Phenol over Pd/AC

Author: LiCheng
Tutor: MaXinBin
School: Tianjin University
Course: Chemical processes
Keywords: diphenyl carbonate phenol oxidative carbonylation Pd/AC water
CLC: O625.323
Type: Master's thesis
Year: 2007
Downloads: 52
Quote: 0
Read: Download Dissertation

Abstract


Diphenyl carbonate (DPC), as an important carbonate, is an important precursor for producing polycarbonates by a melt-polymerization process. Oxidative carbonylation of phenol to produce DPC is a direct environmental synthetic method. This paper focuses on the synthesis of diphenyl carbonate by the oxidative carbonylation of phenol over Pd/AC.The optimum reaction condition was 80℃, 5MPa, molar ratio of CO:O2=10:1 and 4h. The phenol conversion and DPC yield could be 12.37% and 9.89%. The reaction activity could be enhanced by adding cocatalyst such as TBAB,BQ,Ce(OAc). The most efficient hygroscopic agent was 20~40mesh 3A molecular sieve. The conversion of phenol could be increased by adding MS-3A. 1,2-Dichloroethane and dichloromethane as solvent performed favorable effects on phenol conversion and DPC yield because of high polarity and strong permanent dipole moment.The existence of water had a significant influence on the synthesis of diphenyl carbonate by the oxidative carbonylation of phenol. It could be proved that the real critical concentration of water was 1.1wt% by experiments connected with VLE calculation.When the concentration of water was higher than 1.1wt%, the catalytic activities descended rapidly.According to XRD results, the growth of crystal particles and the accumulation of Pd activity component may be caused by the existence of water. Catalyst service life could be extended because of the better dispersion of Pd by adding MS as the hygroscopic agent. According to XPS results, the redox recycle of Pd(0) to Pd(Ⅱ) was interrupted and Pd(0) was accumulated by water, which caused decline of catalyst activity.

Related Dissertations

  1. Preparation and Performance of Molecular Imprinted Polymers for Rhodamine-B and Rhodamine-6G,O631.3
  2. Temporal and Spatial Variation of Methane Emission from Urban Lake and Its Relationship with the Hydrology-water Quality,X524
  3. The Research of Ecological Compensation on the Restoration of Water Quantity in the Man-Made Seasonal Rivers,X143
  4. Studies on the Drying Modle and Technology of Tilapia by Heat Pump,TS254.4
  5. Clinical study of Xu heart,such as academic thought and clinical experience and Yiqi Huoxue,Xiefei Diuresis treatment,congestive heart failure,R259
  6. Capsaicin / β - cyclodextrin system to dissolve and penetrate the,R943
  7. Effects of Intensitive Cycling of Papermaking Water on Sizing and Its Improvement,TS727.5
  8. Study on Application of Non-phosphate Additive in Frozen Penaeus Vannamei and Mechanism of Water-holding,TS254.4
  9. Regional Water Environment Pressure Zoning Based on GIS,X321
  10. Cryopreservation and Transportation for Portunus Pelagicus, Soft Shell Crab and Spawning Crab,S968.252
  11. Water-mdeiated Ablation of Hard Biotissue with Pulse Lases,R318.51
  12. Effects of Enzymes on Metabolism of Polycyclic Aromatic Hydrocarbons in Plant,X173
  13. Synthesis and Application of A Novel Series of Cation Hydrophobically Modified Polyacrylamide,TQ323.6
  14. Research on Anaerobic Fermentation Processing Technology of Dead Tilapia,TS254.4
  15. Study on Mechanism of Seawater Pearl Dyeing and Optimization of Dyeing Technology,TS933.23
  16. Technology Study on Bricks of City Waterworks Sludge,X703
  17. Treatment Bath Wastewater by Diatomite Enhanced Coagulation-Clothy Media Filter Process,X703
  18. The Comprehensive Evaluation of Flue-cured Tobacco Origin Place Environment and Tobacco Leaf of Fangxian,S572
  19. Effects of Water and Nitrogen Coupling on the Water and Nitrogen of Soil and Yield and Quality of Flue-cured Tobacco in Luzhou,S572
  20. Effect of Water and Nitrogen Coupling Using on Soil Physical and Chemical Properties in Tobacco Areas and the Yield and Quality of Fule-cured Tobacco in Yibin,S572
  21. Theeffect of Environmental Factor on Rooting Culture of Paeonia Suffruticosa in Vitro,S685.11

CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Aromatic compounds > Phenols, aromatic alcohols and their derivatives > The functional derivatives of phenol > Phenols and fatty acids (or alicyclic acid ) to generate the lipid
© 2012 www.DissertationTopic.Net  Mobile