Patent
Dyestuff composition: disperse or vat dye and lignin sulphonate
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TLDR
Improved dyestuff compositions are disclosed in this paper comprising, as dispersants, sulfonated lignins prepared by selectively isolating lignin having molecular weights greater than 5,000 and subsequently reacting the lignIN with sodium sulfite and an aldehyde.Abstract:
Improved dyestuff compositions are disclosed herein comprising, as dispersants, sulfonated lignins prepared by selectively isolating lignins having molecular weights greater than 5,000 and subsequently reacting the lignin with sodium sulfite and an aldehyde.read more
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Method for inhibiting the deposition of organic contaminants in pulp and papermaking processes
TL;DR: In this paper, a method of inhibiting the deposition of organic contaminants in a pulp and papermaking system comprising adding to the system an effective amount of a detackifying composition comprising a charged polymer and an oppositely charged surfactant was proposed.
Patent
Production of lignosulfonate additives
TL;DR: In this paper, a method of producing a lignin dispersant composition comprising the steps of methylolating and sulfonating the methylolated Lignin by reaction from about 2.5 to 3.5 moles of the sulfite or bisulfite compound per 1,000 grams of LIGNIN at an initial reaction pH of below about 6.6 and at a temperature of at least about 170°C.
Patent
Low electrolyte sodium lignosulfonates
TL;DR: In this article, a method of producing sodium salts of low electrolyte-containing sulfonates suited for use as dye and print paste additives is described, which is based on methylolating the phenol component of a lignin material in an alkaline liquid medium.
Patent
Method for preparing sodium lignosulfonate and application of sodium lignosulfonate as a dye dispersant
TL;DR: In this article, a method for preparing sodium lignosulfonate is presented, which comprises the following steps: (A) providing a lignin suspension; (B) regulating the pH value of the suspension to 4.8-8.5; (C) sequentially adding sodium sulfite and formaldehyde to the suspension with pH values of 4.5, reacting and filtering to obtain filtrate.
Patent
Method for lignin separation from black liquor comprising multiple acidification steps
TL;DR: In this paper, a method for separation of lignin from original black liquor (BLIN) comprising the following phases in sequence was proposed. But this method was not suitable for the high acidity of black liquor.
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Lignin dispersing agent
TL;DR: A WATER-, ALKALI-and ACID-SOLUBLE, OXIDIZED LIGNIN DISPERSING AGENT, SUBSTANTIALLY FREE OF ORGANICALLY BOUND SULFUR, FORMED by the reaction of OZONE ON LANIGNIN OBTAINED FROM THE SPENT LIQUORS OF THE ALKALTINE PULPING OF WOOD.
Patent
Process for reduction of lignin color
TL;DR: In this paper, a two-step process for reducing the color of sulfonated alkali lignins and lignosulfonates by at least 80% which comprises, blocking at least 90% of the free-phenolic hydroxyl groups in the lignin and then subjecting the blocked ligns to oxidative action by air, molecular oxygen or hydrogen peroxide.
Patent
Process for making sulfonated lignin surfactants
Peter Dilling,Gerald Prazak +1 more
TL;DR: In this article, an improved process for producing sulfonated lignin surfactants for use as dispersants for disperse dyes and vat dyes is described, which has improved fiber staining and heat stability properties over other Lignin-based dispersants.
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