C - Chemistry – Metallurgy – 11 – B
Patent
C - Chemistry, Metallurgy
11
B
C11B 3/10 (2006.01) C01B 33/16 (2006.01) C11B 3/00 (2006.01)
Patent
CA 2340098
A process and composition for removing trace contaminants from glyceride oils utilizes a metal-substituted silica xerogel having a pH of at least 7.5 to adsorb at least a portion of the contaminants. The process of the invention includes contacting a glyceride oil with such an adsorbent and then separating the adsorbent from the contaminant-depleted glyceride oil, for example, by filtration. The composition of the present invention includes a metal-substituted silica xerogel having a pH of at least 7.5 and an organic acid blended with the xerogel. Preferably, the organic acid is citric acid. Contaminants which can be removed from glyceride oils during the refinement of such oils by the adsorbent include phospholipids, soaps, detrimental metals, and chlorophyll.
L'invention concerne un procédé et une composition servant à enlever des contaminants à l'état de trace, à partir de graisses glycérides, au moyen d'un xérogel de silice à substitution métal, possédant un pH d'au moins 7,5, afin d'adsorber au moins une portion des contaminants. Le procédé de l'invention consiste à mettre en contact une huile glycéride avec un tel adsorbant, puis à séparer cet adsorbant de l'huile glycéride appauvrie en contaminants, par exemple par filtration. La composition de l'invention comprend un xérogel de silice, à substitution métal, possédant un pH d'au moins 7,5, ainsi qu'un acide organique mélangé au xérogel. De préférence, l'acide organique est de l'acide citrique. Des contaminants que l'on peut enlever d'huiles glycérides pendant le raffinage de telles huiles, au moyen de l'adsorbant, comprennent des phospholipides, des savons, des métaux gênants, et de la chlorophylle.
Brozzetti Adam J.
Canessa Carlos E.
Blake Cassels & Graydon Llp
Pq Holding Inc.
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