Removal of heavy metal ions from wine and wine-like beverages

• US 5,094,867 A
• Filed: 01/09/1991
• Issued: 03/10/1992
• Est. Priority Date: 01/16/1990
• Status: Expired due to Term

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Detering, Juergen, Sanner, Axel, Fussnegger, Bernhard
• Primary Examiner(s): Czaja, Donald E.
• Assistant Examiner(s): HEGGESTAD, HELEN F
• Application Number:
  US07/639,098
• Time in Patent Office: 426 Days
• Field of Search: 426/330.4, 426/271, 426/422
• US Class Current: 426/271
• CPC Class Codes: C12H 1/0424 with the aid of a polymer

Abstract

A process for removing heavy metal ions from wine and wine-like beverages, which entails treating each 100 l of the beverage with from 5 to 250 g of a polymer which contains, as copolymerized units, from 50 to 99.5% by weight of at least one basic vinylheterocycle with a pK_a of not less than 3.8 and from 0 to 49.5% by weight of another copolymerizable monomer, and which has been prepared with the exclusion of oxygen and of polymerization initiators and in the presence of from 0.5 to 10% by weight, based on the monomers, of a crosslinker.

Claims

1. A process for removing heavy metal ions from wine or wine made from drupes, pomes or berries, which comprises contacting, for not less than one minute, each 100 l of said wine or said wine made from drupes, pomes or berries with 5 to 250 g of a polymer which contains, as copolymerized units, from 50 to 99.5% by weight of at least one basic vinylheterocycle with a pK_a of not less than 3.8, and from 0 to 49.5% by weight of another copolymerizable monomer and which has been prepared with the exclusion of oxygen and of polymerization initiators and in the presence of from 0.5 to 10% by weight, based on the monomers, of a crosslinker;

and then separating said polymer from said wine or said wine made from drupes, pomes or berries.

2. A process as claimed in claim 1, wherein a polymer which contains as basic vinylheterocycle N-vinylimidazole or 2-methyl-1-vinylimidazole or a mixture of the two is employed.

3. A process as claimed in claim 1, wherein a polymer which contains as basic vinylheterocycle 2-vinylpyridine, 4-vinylpyridine or 2-methyl-5-vinylpyridine is employed.

4. A process as claimed in any of claims 1 to 3, wherein a polymer which contains as comonomer only N-vinylpyrrolidone or N-vinylcaprolactam or a mixture of the two is employed.

5. A process as claimed in any of claims 1 to 3, wherein a polymer which contains as crosslinker N,N'"'"'-divinylethyleneurea is employed.

6. A process as claimed in any of claims 1 to 3, wherein a polymer which has been prepared in the presence of a reducing agent is employed.

7. A process as claimed in any of claims 1 to 3, wherein a polymer which has been prepared in the presence of water at from 30°

to 150°

C. is employed.

8. A process as claimed in any of claims 1 to 3, wherein a polymer which has been prepared without solvent at from 100°

to 200°

C. is employed.