12 Questions
What is the primary cause of delignification in the wood?
Oxidizing agents and alkaline materials
What is the effect of delignification on the appearance of the wood?
The wood looks white or bleached and the surface becomes rougher
Which of the following is a key condition that leads to severe deterioration of the wood due to delignification?
High pH and high chlorine residual
Which type of corrosion is characterized by cracking of metal under tensile stress in a corrosive environment?
Stress corrosion cracking
How do microorganisms contribute to corrosion in the cooling system?
They form biofilms that trap water and concentrate corrosive products.
What is the primary difference between crevice corrosion and pitting corrosion?
Crevice corrosion occurs in shielded areas, while pitting corrosion occurs in open areas.
What type of cooling water system is characterized by the water being recirculated in a closed loop?
Open recirculating system
Which oxidizing agent is commonly added to cooling water systems to control microbiological activity?
Sodium hypochlorite
In an open recirculating system, what is used to cool the water and reduce the need for water makeup?
Recycling the water through the plant
Why is chemical treatment economical in closed recirculating systems?
Minimal loss of chemicals
What is a common use of closed recirculating systems?
Cooling gas or diesel engines
How does an open recirculating system handle the remaining water that becomes concentrated with minerals?
By controlling concentration with blowdown
Learn about the process of delignification, which involves the removal of lignin from wood through chemical attack. Discover how this process results in a bleached appearance and rougher texture of the wood, as well as the factors that contribute to this chemical breakdown.
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