Process for effecting an accelerated neutralization of cellulose textile substrates impregnated with alkaline hydroxide
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsJean-Pierre Zumbrunn, Jean Levielle, Andre Thomas, Francoise Grangette
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Abstract
There is effected an accelerated direct neutralization in-situ of the substrates which are impregnated with alkaline hydroxide which is free or fixed on the cellulose, by contact with a neutralizing fluid containing carbon dioxide in a gaseous, aqueous or combined phase, this fluid being introduced in accordance with requirements related to the quantity of alkali to be neutralized. The process may be used in the textile industry in continuous and discontinuous treatments and is adaptable to all types of textile machines employing an aqueous method.
Claims25
A process for neutralizing wet cellulose textile substrate, from which water has been squeezed, impregnated with alkaline hydroxide which is at least in part fixed on the cellulose in the form of alkali-cellulose, comprising
- effecting in-situ an accelerated and directed neutralization of said impregnated textile substrates by contact of said textile substrates with a neutralizing fluid containing carbon dioxide in a quantity sufficient to substantially neutralize and alkali hydroxide and provide a pH in the textile of at most 8.3,
- followed by rinsing of said textile substrate with water, or bleaching or dyeing said cellulose textile substrates.
A process for neutralizing a cellulose textile substrate, impregnated with alkaline hydroxide which is at least in part fixed on the cellulose in the form of alkali-cellulose, comprising
- squeezing the wet cellulose textile to remove aqueous alkaline hydroxide liquid therefrom, thereby leaving a wet cellulose textile;
- rapidly neutralizing said wet cellulose textile to a pH of at most 8.3 by contacting said wet cellulose textile with a neutralizing fluid containing carbon dioxide;
- and
- rinsing said neutralized cellulose textile with water.
Dependencies are inferred from the claim text.