Jennifer A Estes

US Patent:

54497973, Sep 12, 1995

Filed:

Apr 13, 1992

Appl. No.:

7/868064

Inventors:

Jennifer A. Estes - Columbia MD
Cathy L. Harville - Gambrills MD
Felix A. Guerrero - Bogota, CO

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

C11B 310

US Classification:

554191

Abstract:

The invention improves on the amorphous adsorbent-based processes by overcoming the soap leaching problem without using filtration before vacuum bleaching. For fatty materials containing only minor amounts of phospholipid and trace metal impurities, simply vacuum drying at least a portion of the soap-containing fatty material prior to contacting with the amorphous adsorbent eliminates the soap leaching problem. For fatty materials containing higher amounts of phospholipid and trace metals, simply using an acid pretreatment and the vacuum drying step eliminate the soap leaching problem.