Mechanical pulps are bleached with chemicals just to alter many of the

1.	Mechanical pulps are bleached with chemicals just to alter many of the chromophores.
A.	True
B.	False
Answer» B. False

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Pine and fir are difficult to brighten. Colour reduction occurs by altering __________ groups, the pulp is sometimes subsequently treated with SO2 to neutralize OH– and reduce any residual peroxide.
__________ with sodium hydroxide and/or sodium peroxide is utilized to produce the high pH that is crucial to produce the active perhydroxyl ion, HOO–.
__________ (5% on wood) is used usually after the addition of magnesium ion. The mechanism for inactivating the ions by __________ precipitating the ions, but, strictly speaking, it is not a chelating agent.
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In hydrosufite bleching Zn+2SO2andrarr; __________
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Pine_and_fir_are_difficult_to_brighten._Colour_reduction_occurs_by_altering____________groups,_the_pulp_is_sometimes_subsequently_treated_with_SO2_to_neutralize_OH‚Äö√Ñ√∂‚àö√ë‚àö¬®_and_reduce_any_residual_peroxide.$#
__________ (5% on wood) is used usually after the addition of magnesium ion. The mechanism for inactivating the ions by __________ precipitating the ions, but, strictly speaking, it is not a chelating agent?
Chelating agents, such as __________ have the added gain of preventing pulp dis-coloration by binding together with ferric ion that could otherwise form a colored complex with the phenolic lignin structure.
In hydrosufite bleching Zn+2SO2andrarr; __________

Mechanical pulps are bleached with chemicals just to alter many of the chromophores.

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