Acidic aqueous solution containing a chelating agent and the...

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/74 (2006.01) C11D 7/32 (2006.01) C23C 18/16 (2006.01)

Patent

CA 2711634

The present invention relates to an acidic aqueous solution containing a chelating agent and an acid, wherein the chelating agent is glutamic acid N,N-diacetic acid (GLDA) or a salt thereof and wherein the amount of GLDA or the salt thereof is at least 10 wt%,based on the weight of the aqueous solution,and to the use thereof as an oilfield chemical, in descaling processes,or inprocesses in which highly concentrated aqueous acids are used, such ascleaning processes or plating processes.

La présente invention concerne une solution acide aqueuse contenant un agent chélatant et un acide, l'agent chélatant étant l'acide glutamique N,N-diacétique (GLDA) ou un sel de celui-ci et la quantité de GLDA ou de son sel est égale ou supérieure à 10% en poids par rapport à la solution aqueuse, ainsi que son utilisation dans un produit chimique de champ pétrolifère, dans des procédés de détartrage, ou dans des procédés dans lesquels des acides hautement concentrés sont utilisés, tels que des procédés de nettoyage ou des procédés de placage.

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