Digester

– batch 367–368

– discharge 370

– dissolved lignin concentration at different

Locations 298

– downflow hydraulic single-vessel 390

– effective alkali 300

– evacuation 129

– hydraulic single-vessel 386, 388

– pressure 403

– single-vessel hydraulic 383

Dihydroxyanthracene, AQ reduction

Product 317

Diluted alkaline hydrogen peroxide,

Decomposition in deionized water 864

Dilution conveyor 827

Dilution factor, pulp washing parameter

529–532, 545–546

dilution/extraction washing 523

Dioxane lignin, residual 704

Dioxins, concentrations 753

dioxygen 641–649

– electronic structure 642

– electrophilic-nucleophilic reactions

647–649

– principles of activation 642–644

– reactions and reduction products 644

– redox potentials 643

– reductions 854

– simplified bonding scheme 642

– see also oxygen

Dioxygen-alkali delignification processes,

carbohydrate reactions 657–666

Dipertenes, softwoods 35

Diphenylmethane see DPM

Dipolar cycloaddition, lignin degradation

Dipterocarpus, apitonene 37

Direct causticizing 994

Dirty points, paper 1076

disc chipper 80–84

Disc refiners 1104

Disc thickness screen

– diamond roll 93

– raised roll 91

Discharge

– acid sulfite pulping process chemistry

430–434

– consistency 530, 532–533

– gate operating mode 75

Discolored wood 57

Discs

– chipper canter 88

– dentated 91

Dismutation reaction 739

Displacement

– applied on prehydrolysis kraft process 327

– cooking liquor 430–434