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