--%>
Assignment Help - homework help

What are methods of phenol preparation and its uses?

Phenol was initially obtained by fractional distillation of coal-tar. Phenol is present in the middle oil fraction in the distillation of coal-tar. Now-a-days, it is manufactured from cumene (isopropyl benzene).
    
From cumene

The starting material for the preparation of phenol is cumene (isopropyl benzene). Cumene itself is prepared by Friedel-Craft alkylation of benzene with propene. Cumene is oxidized through air to cumene hydroperoxide, which after treatment with dilute sulphuric acid provides phenol and acetone.

2379_Phenol preparation.png 
    
From benzene (Raschig process)

The method involves heating of benzene, HCl and air over a catalyst (mixture of CuCl2 and FeCl2) at 500 K when chlorobenzene is produced. It is then heated with super heated steam at 750 K to give phenol.

719_Phenol preparation1.png 

Another new method for synthesis of phenol is to pass benzene and air over V2O5 at 600 K when benzene is directly oxidized to phenol.

1637_Phenol preparation2.png 

Uses of phenol
    
In the manufacture of drugs like salicylic acid, pheacetin, aspirin, salol etc.
    
For the manufacture of Bakelite by polymerizing with formaldehyde.
    
For the manufacture of phenolphthalein, picric acid.
    
As a additive for ink.
    
For the manufacture of cyclohexanol used as solvent for rubber.
    
As a strong antiseptic in soaps, lotions etc.
    
Phenol is used in the manufacture of herbicides such as '2, 4-D' and germicides such as "TCP".

   Related Questions in Chemistry

  • Q : How molecule-molecule collisions takes

    An extension of the kinetic molecular theory of gases recognizes that molecules have an appreciable size and deals with molecule-molecule collisions. We begin studies of elementary reactions by investigating the collisions b

    		•
  • Q : Molecular Symmetry Types The number of

    The number of molecular orbitals and molecular motions of each symmetry type can be deduced. Let us continue to use the C2v point group and the H2O molecule to illustrate how the procedure develop

    		•
  • Q : Production of alcoholic drinks give all

    give all physical aspects in the production of alcohol

    		•
  • Q : Explain various chemicals associated

    During processing of food, several chemicals are added to it to augment its shelf life and to make it more attractive as well. Main types of food addi

    		•
  • Q : Importance of organic chemistry

    Describe the importance of organic chemistry?

    		•
  • Q : Question on seminormal solution Provide

    Provide solution of this question. The weight of sodium carbonate required to prepare 500 ml of a seminormal solution is: (a) 13.25 g (b) 26.5 g (c) 53 g (d) 6.125 g

    		•
  • Q : Finding Normality Can someone please

    Can someone please help me in getting through this problem. Concentrated H2SO4 has a density of 1.98 gm/ml and is 98% H2SO4 by weight. The normality is: (a) 2 N  (b) 19.8 N  (c) 39.6 N  (d) 98

    		•
  • Q : Vapour pressure Vapour pressure of

    Vapour pressure of methanol in water Give me answer of this question. An aqueous solution of methanol in water has vapour pressure: (a) Equal to that of water (b) Equal to that of methanol (c) More than that of water (d) Less than that of water

    		•
  • Q : M ive me answer of this question. When

    ive me answer of this question. When mercuric iodide is added to the aqueous solution of potassium iodide, the: (a) Freezing point is raised (b) Freezing point is lowered (c) Freezing point does not change (d) Boiling point does not change

    		•
  • Q : Atmospheric pressure Give me answer of

    Give me answer of this question. The atmospheric pressure is sum of the: (a) Pressure of the biomolecules (b) Vapour pressure of atmospheric constituents (c) Vapour pressure of chemicals and vapour pressure of volatile (d) Pressure created on to atmospheric molecules

    		•