19 + Mcqs in Bleaching Chemical Pulps in Pulp Paper Page 1 McqOptions

Explore topic-wise MCQs in Pulp Paper.

The ____________ is extraction of de-graded lignin compounds, which would increment the chemical usage in subsequent bleaching stages.

Bleaching with H2O2, is not common for chemical pulps. (But this is changing somewhat as mills look for chlorine-free systems.) It’s used for brightening mechanical pulps. What is the name of the alternative method utilized?

____________ is a term used to describe each of 2 completely different methods. 1st is the utiliztion of enzymes which are isolated from decay fungi to selectively de-grade lignin.

____________ and other chemicals are considered for bleaching stages, but don’t enjoy commercial importance.

Lignin-Cl + NaOH and rarr;Lignin-OH + NaClThe lignin in the E effluent gives a ____________ colour that’s ultimately responsible for much of the colour of the final mill effluent.

The ____________ stage is a modification of C stage bleaching, where some of the chlorine is replaced with ClO2.

2NaCl + 2 H2O + ____________ andrarr; Cl2 + 2NaOH + H2

Mechanical pulp bleaching is accomplished with various compounds containing Cl or O2 and alkali extractions in several stages.

Cellulose viscosity of mechanical pulps and of high yield pulps are not measured since it’s quite low .

THE______________IS_EXTRACTION_OF_DE-GRADED_LIGNIN_COMPOUNDS,_WHICH_WOULD_INCREMENT_THE_CHEMICAL_USAGE_IN_SUBSEQUENT_BLEACHING_STAGES.?$

BLEACHING_WITH_H2O2,_IS_NOT_COMMON_FOR_CHEMICAL_PULPS._(BUT_THIS_IS_CHANGING_SOMEWHAT_AS_MILLS_LOOK_FOR_CHLORINE-FREE_SYSTEMS.)_IT‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬•S_USED_FOR_BRIGHTENING_MECHANICAL_PULPS._WHAT_IS_THE_NAME_OF_THE_ALTERNATIVE_METHOD_UTILIZED??$#

____________ is a term used to describe each of 2 completely different methods. 1st is the utiliztion of enzymes which are isolated from decay fungi to selectively de-grade lignin?

____________ and other chemicals are considered for bleaching stages, but don‚Äö√Ñ√∂‚àö√ë‚àö¬•t enjoy commercial importance.$

Lignin-Cl + NaOH and rarr;Lignin-OH + NaCl

The ____________ is the process of extraction of degraded lignin compounds, which could increment the chemical usage in subsequent bleaching stages.

The ____________ stage is a modification of C stage bleaching, where some of the chlorine is replaced with ClO2.

2NaCl + 2 H2O + ____________ andrarr; Cl2 + 2NaOH + H2

Mechanical pulp bleaching is accomplished with various compounds containing Cl or O2 and alkali extractions in several stages.

Cellulose viscosity of mechanical pulps and of high yield pulps are not measured since it‚Äö√Ñ√∂‚àö√ë‚àö¬•s quite low .

The ____________ stage is a modification of C stage bleaching, where some of the chlorine is replaced with ClO₂.

2NaCl + 2 H₂O + ____________ andrarr; Cl₂ + 2NaOH + H₂

Mechanical pulp bleaching is accomplished with various compounds containing Cl or O₂ and alkali extractions in several stages.