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Desizing process reactions - Hydrolytic and Oxidation method

Hydrolytic and Oxidation method

Desizing process
Desizing process

In desizing process, to convert starch into glucose, there are two ways as follows-

Two types of methods are made on two types of reactions during Desizing -

(A) Hydrolytic method. 

(B) Oxidation Method 

These two types of reactions convert starch into alpha glucose.

Hydrolytic method

Chemically, starch is a mixture of amylose straight chains and amylopectin branching chains that are insoluble in water. 

They can be rendered soluble by hydrolysis, which produces an Alpha glucose unit that is soluble in water.

Hydrolytic method for desizing
Hydrolytic method

Oxidative method 

With the help of nascent oxygen (O), starch is oxidized and transformed into Dextrin. 

Under ideal chemical and temperature circumstances, oxidizing agents liberate nascent oxygen, which aids in the oxidation of starch into a water-soluble state.

Strong oxidizing agents should be used which give nascent oxygen.

Ex. KMnO4, NaOCL, H2O2, Sodium bromite, etc.



This method is suitable for blend composition.

If conditions are not followed then oxycellulose formation takes place which hampers the fabric.

Excellent & uniform removal of size.

Machine corrosion takes place.

Energy & water consumption is less.

The process is costly.

It can be combined with preparatory processes like scouring, bleaching, etc.

Working with chemicals is harmful to the human body.

Oxidative method for desizing process
Oxidative method for desizing process
Oxidative method for desizing process
Oxidative method for desizing process

Questions -

  1. What are the two methods of desizing reactions?
  2. Describe hydrolytic method for desizing with its reactions.
  3. Describe oxidation method for desizing process with its reactions.


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Further reading,

 - Rushikesh Patil (Textile Engineer)
(DKTE Society textile engineering college Ichalkaranji)
Email Id -

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