Dissertation > Excellent graduate degree dissertation topics show

Synthetic Procedure of 4,4’-Bis(chloromethyl)biphenyl

Author: DengXingGuo
Tutor: JiangGuoFang
School: Hunan University
Course: Analytical Chemistry
Keywords: Fluorescent brighteners 4,4 '- dichloro- methyl- biphenyl Paraformaldehyde Synthesis Industrialization
CLC: TQ242
Type: Master's thesis
Year: 2010
Downloads: 119
Quote: 0
Read: Download Dissertation

Abstract


Fluorescent brightener more and more into our lives. The fluorescent whitening agent is a fluorescent dye or a white dye, also called a complex organic compound. Its characteristics can stimulate the incident ray fluorescence dyed material fluorite-like sparkling effect, so that the naked eye can see the material is very white, whitening effect. The fluorescent brightener already has been widely used in the paper industry, washing powder, washing paste, soap, soap, liquid detergent production. 4,4 '- dichloro methyl diphenyl synthetic fluorescent brightener 4,4' - bis (2 - sulfonatophenyl) biphenyl (CBSX) the key intermediates, and its purity directly affect the fluorescence brighteners pros and cons of the product. Research, optimization of 4,4 '- biphenyl dichloromethyl process both for industrial applications or academic research has far-reaching significance. Starting from the application, combined with the results of previous studies, improvement and innovation at the same time be ideal synthesis process. The thesis contains the following: (1) 4,4 - dichloro-methyl biphenyl research, synthesis methods detailed overview and analysis of the advantages and disadvantages of Synthesis. (2) In the literature on the basis of 4,4 '- dichloro methyl diphenyl various aspects of the synthesis process conducted a detailed study. Have carried out a detailed inquiry, from the reaction conditions to the reaction raw material feed ratio to get the desired results. (3) combined with the needs of production, through repeated studies, we found that in the reaction of the mid-added raw materials paraformaldehyde phase transfer catalyst used in concentrated hydrochloric acid - Formic Acid, these measures take on 4,4 '- The chloromethyl biphenyl yield improvement are taken to promote the role. We have obtained the best laboratory process is: of biphenyl with paraformaldehyde to 1:22 (molar ratio) feed; zinc chloride catalyst is used in an amount of biphenyl-1.7 times (molar ratio), while using a catalytic equivalent of phase transfer catalyst; formic acid and concentrated hydrochloric acid as the reaction solvent, the quality of the water in the reaction solvent is 4-5 times the quality of the zinc chloride; reaction at 90 ℃ for 17 h, the reaction process is always accompanied by the hydrogen chloride gas passed into, in the reaction in to the reaction mixture in the late complement Cadogan polyoxymethylene starting paraformaldehyde amount of 1/15, the amount of complement added. Synthesis route and related patent technology research control has obvious advantages obtained in the case of no increase in the cost of synthesis process has a good prospect in industrial applications. (4) and the Laboratory of optimal technology, amplification experiments conducted in a corporate, industrial production technology.

Related Dissertations

  1. Studies on the Synthesis and Technology of Dipentaerythritol and Its Derivative,TQ223.164
  2. Synthesis and Characterization on Semi-Aromatic Polyamides Containing Benzoxazole Units,O633.5
  3. Hydrothermal Synthesis of Oxide Hollow Spheres,TB383.4
  4. Video Coding Research Based on Texture Characteristics,TP391.41
  5. Poetic alienation : graphics,J506
  6. Urothermal Synthesis, Structure and Characterization of Functional Coordination Polymers,O631.3
  7. The Total Synthesis of a Flavonoid Glycoside Apigenin-7-O-β-D-glucuronide,R284.1
  8. Atovaquone analogues Design, Synthesis and antitumor activity of,R914
  9. Synthesis and Seperation of 1,1’-binaphthol,O625.3
  10. Flexible,rigid,Synthesis and characterization of mixed ligand complexes,O621.1
  11. Synthesis and Performance Study of Bisphenol AP-based Polybenzoxazines,TQ320.1
  12. Study on the Synthetic Process of Vat Pink R,TQ616.2
  13. Study on the Mechanism of Night Temperature to Grain Filling of Inferior in Rice,S511
  14. Gold-catalyzed Addition Reaction of Sulfonates and Alkynes and Study of Synthesis and Bioactivity of (E)-3-phenyl-substituted Acrylic Acids,R914
  15. Synthesis and Identification of P22/P221 Polypeptides of IBDV Ligand Epitope and Screening CEF Library,S852.65
  16. Curing Mechanism and Properties of Fluorenyl Epoxy Resin,TQ323.5
  17. Study on Antioxidant Activities and Lipase-catalyzed Transesterification of Lard to Produce L-ascorbyl Fatty Acid Esters,TS202.3
  18. Expression of β-Catenin in Pig’s Ovary and the Effect of β-Catenin on Porcine Granulosa Cells Apotosis and Steroidogenesis Related Enzyme,S828
  19. The Problems and Solutions of University’s Ideological and Political Education under Network Environment,G641
  20. The Research on Texture Synthesis Technology from Cloud Theory & Been Evolution Genetic Algorithm,TP391.41
  21. Synthesis and Properties of Novel Low Viscosity Difluorooxymethylene-Bridged Liquid Crystals Compounds,O753.2

CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aromatic compounds > Aromatic hydrocarbons and halogen derivatives
© 2012 www.DissertationTopic.Net  Mobile