Viscosity 459

HHV 968

– kraft recovery boiler 984

1316 Index

hi-heat washing 384, 558

HI-Q Fine Screen, Impco 601

HI-Q Knotter, GL&V Impco 602

high consistency ozone stage, bleaching 617,

806, 827

high molecular fraction, adsorbable organic

compounds 771

high-performance anion-exchange

chromatography, water prehydrolyzate

neutral sugar fraction 340–341

high-purity Eucalyptus prehydrolysis kraft

pulp 727

high resin content, pulp 1031

high-shear mixers 731

– bleaching equipment 620

– medium-consistency ozone delignification

system 826

– oxygen gas addition 867

– ozone solubilization 802

high-temperature gasification 992

high-viscosity ethers, dissolving pulp

characterization 1061

high-volume low-concentration 372

higher heating value see HHV

Himalaya spruce, spiral thickenings 44

HMF see hydroxymethylfurfural

hole size, in relation to fiber passage ratio

578

HOMO-distribution, phenylpropene unit 2

633

homocellular rays, hardwoods 54

homolytic decomposition 651

homolytic fragmentation, veratryl-b-guaiacyl

ether 751

hornification 1054

– fibers 1284

hot acid hydrolysis 883–885

– comparison with chorine dioxide 762

– time dependence 885

hot black liquor 136–137, 346, 348, 372–374

hot caustic extract, composition 961–962

hot caustic extraction (HCE) 948, 952–963

– pulp purification 935

– treatment without interstage washing 954

hot chlorine dioxide process 764

hot displacement

– displacement cooking process step 369

– prehydrolysis-kraft process 348–350

hot purification process 934

hot water extraction 1225

hot white liquor 346, 348, 372–374

HP-AEC see high-performance anionexchange

chromatography

[HS–]/[OH–] ratio, at different digester

locations 300

HS– see hydrogen sulfide ion

HSO3

– see hydrogen sulfite ion

Huckel see Debye–Huckel–Onsager equation

humidity, kraft recovery boiler 985

HVLC see high-volume low-concentration

HW-S see hardwood-sulfite dissolving pulp

HWL see hot white liquor

hybrid poplar, lignin weight fractions 213

hydrate cellulose, first indication 935

hydraulic cook 275

hydraulic digester

– downflow single-vessel 390

– single-vessel 383, 386, 388

hydrazine method, carbonyl groups

determination 1236

hydrazones, formation 1236

hydrocyclone 562, 1118

– axial and tangential velocity profile 581

– flow pattern 580

– forces acting on a particle 583

– gravity separator 579

– operation principle 1119

– screening and cleaning equipment

605–606

– streams 579

hydrodynamically equivalent volume,

macromolecule 1250

hydrogel 1052

hydrogen abstraction, carbohydrates 795

hydrogen bonds, cellulose 26

hydrogen peroxide 646–647

– chlorine dioxide generation 744

– decomposition 852, 854

– efficiency of chlorine dioxide 768

– formation 794

– manufacture 850–853

– one-electron reduction 669

– oxidation 613, 854

– oxygen 264

– physical properties 850–853

– thermal stability 863–865

– see also hydroperoxides

hydrogen peroxide bleaching 849–879, 1123,

1126–1133

– activators 880

– chemistry 853–860

– technology 866

hydrogen sulfide, addition to quinone

methide 167

hydrogen sulfide consumption, selected

model of kraft cooking kinetics 220–221