Process for modification of the physical and chemical properties of a plant extract of Acacia Mimosa, a modified plant extract, and use of a chemically modified plant extract
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United States of America Patent
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Issued Date -
Jun 10, 2004
app pub date -
May 28, 2003
filing date -
Dec 9, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention refers to a process for modification of the physical and chemical properties of a plant extract of Acacia Mimosa, for tanning and retanning of skins, comprising: (a) mixing a powdered extract of Acacia Negra with water at a ratio of about 0.5 to 2.0 kg per liter of water, preferably at a ratio of 1.0 to 1.5 kg per liter, and most preferably of 1.05 to 1.06 kg per liter; or optionally, using a solution of tannin in liquid form in a concentration of 25% to 60%, preferably in a concentration of 45% to 55%, and most preferably in a concentration of 50% of total solids content; (b) heating the mixture thus formed while vigorously stirring the same at a temperature between 50 and 100.degree. C., preferably between 67 and 98.degree. C.; (c) slowly adding a sulphonation agent to the heated mixture, at a ratio by weight of about 1/100 to about 1/20 to the extract of Acacia Negra; and (d) raising the temperature of the mixture to a range between 45 to 135.degree. C., maintaining a pressure between 0.2 kgf/cm.sup.2 and 7 kgf/cm.sup.2 for a period comprised between 1 and 14 hours to complete the sulphonation of the tannin.
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