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Prehydrolyzed Chips: A Case Study

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Pre-hydrolysis is the main portion in the production process of dissolving pulp. The important principle of this process is to take out hemicelluloses .Pre-hydrolysis is done by water, acid and alkali. H2SO4 is used for acid pre-hydrolysis while NaOH is used for alkali pre-hydrolysis. Water is used for doing pre-hydrolysis by water.Substitution of uronic acid and cleavage of O-acetyl during pre-hydrolysis cause the formation of various types of organic acids and acetic acid. These acids enhance the break down the chain of hemicellulose into monomers and oligomer. This help to solubilize the hemicellulose into hot water.
The cooking of prehydrolyzed chips is significantly faster (40% shorter cooking times) than that ofunhydrolyzed chips. To obtain similar kappa numbers at similar cooking temperatures .

1.3.2.2. Cooking
Cooking performance of Soda-AQ was quite comparable to kraft cooking . Anthraquinone (AQ) is used both to enhance the degradation of lignin and to reduce the degradation of cellulose in the soda pulping process and it is called as Soda-AQ pulping. This technique helps to increase the yield preventing cellulose degradation .
Pre-hydrolyzed soda-AQ dissolving pulp can be made from Populus deltoides at high level of alpha-cellulose content, and acceptable levels of final yield, brightness and viscosity . …show more content…

The use of ECF bleaching results in reduced levels of chlorinated pollutants in the wastewater stream. ECF bleaching process usually uses chlorine dioxide stages (D) as its main bleaching process and performed under acidic conditions. ECF bleaching also has an alkaline extraction stage (E) after chlorine dioxide stage, which is often combined with hydrogen peroxide (P), under oxygen pressure (O). One standard ECF sequence in a modern pulp mill is D(EOP)DD, but it can also be designed as an (OP)(ZE)D

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