Kemira Oyj

Taminco Finland

Kemira Chemicals Oy

Esko Tirronen

Jukka Hietala

Asko Karppi

Juhana Ahola

Timo H Nissinen

Jan Pavlicek

Pekka Oinas

Antti Vuori

Antero Laitinen

Krister Eskilsson

Stig Gunnarsson

Marko Lahtinen

Kari Saari

Jarmo Reunanen

Jeffrey Campbell

Tom Granstrom

Faziollah Azarnoush

The invention relates to a method for dissolving cationic starch. In the method is obtained an aqueous polyelectrolyte solution comprising a synthetic cationic polymer, which has a charge density value of at least 0.1 meq/g, determined at pH3, the concentration of the cationic polymer in the polyelectrolyte solution being &#x3e;2.5 weight-%, and the aqueous polyelectrolyte solution is brought together with cationic starch having a degree of substitution, DS, &#x3e;0.1. The cationic starch is dissolved to the polyelectrolyte solution by heating and/or mixing. The invention relates also to a papermaking agent comprising 2-40 weight-% of synthetic cationic polymer which has a charge density value of at least 0.1 meq/g, determined at p H 3, and 2.5-25 weight-% cationic starch having degree of substitution, DS, &#x3e;0.1. The papermaking agent is in slurry form and has a viscosity of 50-20 000 m Pas, measured at 25&#xb0; C. with Brookfield DVI+ viscometer.

Method for dissolving cationic starch, papermaking agent and its use

Processes for forming high iron content ferric chloride solutions, reconstituting ferric chloride solutions, and transporting the stable ferric chloride solutions with the high iron content are disclosed.

Processes for making high iron content stable ferric chloride solutions

The present invention relates to a method and an arrangement for separation and recovery of at least one carboxylic acid and furfural from a dilute aqueous mixture thereof. In the method of the present invention a dilute aqueous mixture comprising at least one carboxylic acid and furfural is extracted with methyltetrahydrofurane, and at least one carboxylic acid and furfural are recovered. The arrangement of the present invention comprises an extraction unitfor carrying out extraction of at least one carboxylic acid and furfural from dilute aqueous mixture with methyltetrahydrofuran, connected to distillation unitfor carrying out distillation of the extractfrom the extraction unit, and connected to acids distillation unitfor carrying out distillation of the bottom streamfrom the distillation unitto separate at least one carboxylic acid and furfural.

Method and an arrangement for separating at least one carboxylic acid and furfural from a dilute aqueous mixture thereof

The present invention provides a method for purifying and recovering propionic acid from an aqueous mixture containing a fermentation product obtained from a fermentation process using glycerol as substrate, the method comprising optionally acidifying the aqueous mixture to a pH below 4.5, subjecting the aqueous mixture to an extraction with extracting agent containing a heavy extractant and optionally a light extractant as a diluent to obtain an extract comprising the extracting agent and organic acids, and a raffinate comprising water and any unreacted glycerol, and subjecting the extract to vacuum evaporation to separate propionic acid-containing organic acids from the extractant.

Method for recovering and purifying propionic acid

Processes for the recovery of formate salt from biomass and the product obtained thereof generally include subjecting an aqueous liquid mixture containing levulinic acid, formic acid and possibly furfural to a liquid-liquid extraction process, followed by the recovery of the furfural, the formate salt and the levulinic acid or the levulinate salt.

Process for preparation of formate salt

In a method for preparing formic acid, methyl formate is prepared with methanol as a reactant. In the method, methyl formate obtained from methanol in a reaction is fed through an ion exchange bed, in which the hydrolysis into formic acid and methanol and the separation of formic acid from methanol take place simultaneously by means of the catalytic and adsorbent properties of a solid in exchange material in the ion exchange bed

Method for preparing formic acid

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Espoo, Finland

Esko Tirronen