Vaishnavi Gaur

Class VIIIth A

Acrylic- Manufacturing Process and Properties Polyacrilonitrile ( Acrylic)

•Vinyl Cyanide, more commonly known as acrylonitrile, can under go addition polymerisation to form polyacrylonitrile. Which is acrylic fibre.•Acrilonitrile is the main raw material for the manufacture of acrylic fibres.•It is made by Two methods. 1.In one commercial method hydrogen cyanide is treated with acetylene:

acetylene + Hydrogen cyanide(HCN) --> Acrilonitrile

2.In second method Ethylene--Air Oxidation--> Ethylene oxide + HCN--> Ethylene cyanahydrin--

Dehydration at 300 deg C (catalyst)--> Acrylonitrile

In Polymerisation Process of Acrilonitrile

In a continuous polymerisation process,input (1). 95% acrylonitrile and (2)4% methyl acrylate

(3) 0.25% aqueous solution of K2S2O8, (4) 0.50 % Na2S2O5 solution (5).0.25% sulphuric acid are fed into the reaction vessel at 52

degree C,under nitrogen atmosphere.Output:- giving a slurry with 67% polymer. The slurry is continuously withdrawn, filtered and washed till it is free from salts and dried.

Which is an acrylic fibre.

Unit for acrylic fibre production, including polymerisation, spinning and fibre line.

The standard capacity for one single fibreline is 22'500 tons/year