Production of anionic surfactant granules by in situ...

C - Chemistry – Metallurgy – 11 – D

Patent

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C11D 11/00 (2006.01) C11D 3/12 (2006.01) C11D 11/04 (2006.01)

Patent

CA 2420282

A process for the production of detergent particles comprises feeding an acid precursor of an anionic surfactant, a neutralising agent and aluminosilicate detergency builder into a horizontal thin-film evaporator/drier. The evaporator/drier comprises a mixing region, a drying region and a cooling region. Neutralisation of the acid precursor is effected, together with granulation, drying and cooling, to form the detergent particles. At least some of the aluminosilicate builder is fed into the thin-film evaporator/drier between the drying region and the cooling region and/or into the cooling region. When all of he aluminosilicate builder is fed into the cooling region, the aluminosilicate is in an amount of more than 20% by weight of the particles exiting the cooling region.

Cette invention concerne un procédé de fabrication de particules détergentes consistant à introduire dans un évaporateur-sécheur à film mince horizontal un précurseur acide de tensioactif anionique, un agent neutralisant et un adjuvant de détergence à base d'aluminosilicate L'évaporateur-sécheur comprend une zone de mélange, une zone de séchage et une zone de refroidissement. Les opérations de neutralisation du précurseur acide ainsi que de granulation, séchage et refroidissement, vise à former des particules détergentes. Une partie au moins de l'adjuvant aluminosilicaté est introduite dans l'évaporateur-sécheur à film mince entre les zone de séchage et de refroidissement et/ou à l'intérieur de la zone de refroidissement. Lorsque la totalité de l'adjuvant aluminosilicaté a été introduite dans la zone de refroidissement, l'aluminosilicate représente 20 % en poids des particules à la sortie de la zone de refroidissement.

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