Polymeric composition for preventing the formation of scale during evaporation of sugar juices
AssigneeKeller & Bobacek GmbH & Co., KG.
InventorRenate Keller
Life of this patent
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Abstract
Polymeric compositions useful for preventing formation of scale in apparatus used for evaporating sugar juices comprise a mixture of at least three polymers selected from polyacrolein or - methacrolein compounds, poly-acrylic or - methacrylic compounds, copolymers of the foregoing compounds, polyacrylamides and polymers of maleic anhydride alone or together with vinyl methyl ether, at least one of said polymers being present in an amount of at least 10% by weight and at least two of said polymers each being present in an amount of at least 5% by weight based on the total amount of said polymers.
Claims2
A polymeric composition for preventing the formation of scale when evaporating fruit juices, which is characterized in that it contains a mixture of at least three polymers, at least two of said polymers being selected from the group consisting of:
- (a) polymers and salts of formula I ##STR5## wherein:
- R.sub.1 is --H, --OH, --CH.sub.3, --CH.sub.2 OH and/or --Cl
- R.sub.2 is --CHO, --CH.sub.2 OH and/or --COOCH.sub.2 CH.sub.2 COOH
- R.sub.3 is --H, --CH.sub.3 and/or --CH.sub.2 OH
- n.sub.1 is 0.5 to 0.95
- m.sub.1 is 0.05 to 0.5
- n.sub.1 +m.sub.1 =1, and
- P.sub.1 is 6 to 300;
- and wherein said polymers of formula I differ in the mean degree of polymerisation P.sub.1 by at least 20%, based on the value P.sub.1 of the polymer with the lowest mean degree of polymerisation;
- and at least one further polymer selected from the group consisting of:
- (b) a polymer or salt of formula II ##STR6## wherein:
- n.sub.2 is 0.4 to 1.0
- m.sub.2 is 0 to 0.6
- n.sub.2 +m.sub.2 =1
- P.sub.2 is 5 to 4000, or a lower alkyl ester thereof;
- (c) a polymer or salt of formula III ##STR7## wherein:
- n.sub.3 is 0.95 to 1
- m.sub.3 is 0.05 to 0
- n.sub.3 +m.sub.3 =1
- P.sub.3 is 6 to 300
- R.sub.1, R.sub.2 and R.sub.3 have the same meaning as in (a);
- (d) an anionic polyacrylamide or salt of formula IV ##STR8## wherein:
- n.sub.4 is 0.05 to 0.95
- m.sub.4 is 0.95 to 0.05
- n.sub.4 +m.sub.4 =1
- P is 10 to 500
- in which at least one of the polymers is present in an amount of at least 10% by weight and at least two of the polymers are present each in an amount of at least 5% by weight, based on the total amount of the polymers.
A polymeric composition for preventing the formation of scale when evaporating fruit juices, which is characterized in that it contains a mixture of at least three polymers, at least three of said polymers being selected from the group consisting of:
- (a) polymers and salts of formula I ##STR9## wherein:
- R.sub.1 is --H, --OH, --CH.sub.3, --CH.sub.2 OH and/or --Cl
- R.sub.2 is --CHO, --CH.sub.2 OH and/or --COOCH.sub.2 CH.sub.2 COOH
- R.sub.3 is --H, --CH.sub.3 and/or --CH.sub.2 OH
- n.sub.1 is 0.5 to 0.95
- m.sub.1 is 0.05 to 0.5
- n.sub.1 +m.sub.1 =1, and
- P.sub.1 is 6 to 300;
- and wherein said polymers of formula 1 differ in the mean degree of polymerisation P.sub.1 by at least 20%, based on the value P.sub.1 of the polymer with, in each case, the lowest mean degree of polymerisation;
- said remaining polymers being selected from the group consisting of:
- (b) a polymer or salt of formula II ##STR10## wherein:
- n.sub.2 is 0.4 to 1.0
- m.sub.2 is 0 to 0.6
- n.sub.2 +m.sub.2 =1
- P.sub.2 is 5 to 4000, or a lower alkyl ester thereof;
- (c) a polymer or salt of formula III ##STR11## wherein:
- n.sub.3 is 0.95 to 1
- m.sub.3 is 0.05 to 0
- n.sub.3 +m.sub.3 =1
- P.sub.3 is 6 to 300
- R.sub.1, R.sub.2 and R.sub.3 have the same meaning as in (a);
- (d) an anionic polyacrylamide or salt of formula IV ##STR12## wherein:
- n.sub.4 is 0.05 to 0.95
- m.sub.4 is 0.95 to 0.05
- n.sub.4 +m.sub.4 =1
- P is 10 to 500
- in which at least one of the polymers is present in an amount of at least 10% by weight and at least two of the polymers are present each in an amount of at least 5% by weight, based on the total amount of the polymers.
Dependencies are inferred from the claim text.