Qhov sib txawv tseem ceeb ntawm Kraft lignin thiab lignosulfonate yog Kraft lignin tuaj yeem ua kom muaj zog ntxiv thiab ua kom cov iav hloov pauv thiab dej solubility, thaum lignosulfonate tuaj yeem muaj cov nyhuv plasticizing ntawm cov khoom siv kho tshuab.
Muaj ntau hom lignin, xws li dej qab zib lignin, Kraft lignin, hydrolyzed lignin, organosolv lignin, thiab lignosulfonates.
Kraft Lignin yog dab tsi?
Kraft lignin yog ib hom kev lag luam lignin uas tau los ntawm Kraft pulp. Qhov no pulp suav txog li 85% ntawm tag nrho cov lignin ntau lawm hauv ntiaj teb. Txoj kev hu ua "Kraft pulp method" yog txoj hauv kev tseem ceeb rau kev hloov pauv ntawm cov ntoo coniferous mus rau pulp. Txoj kev pulping no ua rau muaj txiaj ntsig zoo dua li cov txheej txheem alkaline pulping.
Feem ntau, Kraft lignin yog soluble tag nrho hauv cov kuab tshuaj alkaline xws li NaOH. Indulin AT yog ib hom kraft lignin. Nws kuj yog soluble hauv DMSO, DMF, thiab ethylene glycol. Txawm li cas los xij, solubility ntawm cov khoom no hauv acetone, ethanol, thiab THF yog qhov tsis zoo. Nws kuj tsis zoo soluble hauv dej.
Peb tuaj yeem rho tawm kraft lignin los ntawm cov cawv dub uas tau tsim thaum lub sij hawm zom cov ntoo. Tam sim no, muaj qee cov dej-soluble kraft lignin hom uas tau npaj tshuaj. Cov txheej txheem suav nrog kev npaj ntawm daim ntawv purified ntawm CO2-precipitated softwood kraft lignin. Qhov no tsim cov kua dej ruaj khov ntawm tus nqi pH ntawm 8.9.
Lignosulfonate yog dab tsi?
Lignosulfonate yog cov dej-soluble anionic polyelectrolyte polymer uas los ua ib qho khoom los ntawm kev tsim cov ntoo pulp, uas cuam tshuam nrog acidic cleavage ntawm ether bonds. Cov ether bonds txuas ib tug xov tooj ntawm cov ntsiab lus ntawm lignin. Lignosulfonates yog abbreviated li LS. Muaj lwm hom sulfonated lignin (SL) hom uas tseem yog lignin byproducts uas ua rau hauv cov txheej txheem Kraft. Ob leeg lignosulfonates thiab sulfonate lignin muaj kev siv zoo sib xws thiab feem ntau tsis meej pem cov ntsiab lus. Txawm li cas los xij, sulfonated lignin yog qhov pheej yig dua. Ntxiv mus, ob hom no tshwm sim raws li cov hmoov dawb ntws nrog cov xim sib txawv: LS yog lub teeb xim av thaum SL yog xim av tsaus.
Daim duab 01: Kev Npaj ntawm Lignosulfonate
Ntau zaus, lignosulfonates qhia ntau yam ntawm molecular masses xws li 1 000 txog 140 000 Da. Piv txwv li, lwm hom lignin muaj qhov me me rau molecular mass, xws li 2 000 txog 3 000 Da. Lignosulfonate yog nontoxic thiab noncorrosive; nws tseem yog biodegradable. Tsis tas li ntawd, peb tuaj yeem ntxiv ntau yam kev hloov kho rau cov khoom no los ntawm oxidation, hydroxymethylation, sulfomethylation, thiab kev sib xyaw ntawm ob.
Qhov txawv ntawm Kraft Lignin thiab Lignosulfonate yog dab tsi?
Muaj ntau hom lignin, xws li dej qab zib lignin, Kraft lignin, hydrolyzed lignin, organosolv lignin, thiab lignosulfonates. Kraft lignin yog ib hom kev lag luam lignin uas tau txais los ntawm Kraft pulp thaum lignosulfonate yog cov dej-soluble anionic polyelectrolyte polymer uas yog ib qho los ntawm kev tsim cov ntoo pulp. Qhov sib txawv tseem ceeb ntawm Kraft lignin thiab lignosulfonate yog Kraft lignin tuaj yeem ua kom muaj zog ntxiv thiab ua kom cov iav hloov pauv thiab dej solubility, thaum lignosulfonate tuaj yeem muaj cov nyhuv plasticizing ntawm cov khoom siv kho tshuab.
Cov ntawv qhia hauv qab no nthuav tawm qhov sib txawv ntawm Kraft lignin thiab lignosulfonate hauv daim ntawv tabular rau kev sib piv ntawm ib sab.
Summary – Kraft Lignin vs Lignosulfonate
Kraft lignin yog ib hom kev lag luam lignin uas tau los ntawm Kraft pulp. Lignosulfonate yog ib qho dej-soluble anionic polyelectrolyte polymer uas los ua ib qho khoom los ntawm kev tsim cov ntoo pulp, uas cuam tshuam nrog acidic cleavage ntawm ether bonds. Qhov sib txawv tseem ceeb ntawm Kraft lignin thiab lignosulfonate yog Kraft lignin tuaj yeem ua kom muaj zog ntxiv thiab ua kom cov iav hloov pauv thiab dej solubility, thaum lignosulfonate tuaj yeem muaj cov nyhuv plasticizing ntawm cov khoom siv kho tshuab.
