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US4087371A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of preventing incrustation on heated surfaces, and composition for the practice of the method

Assignee: Grillo Werke AG
•
Filing: 1974-07-29
•
Granted: 1978-05-02
•
Expires: 1994-07-29
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Abstract

Abstract Method of preventing deposits of dissolved inorganic salts on heated surfaces, such as tubular heat exchangers, is carried out by adding a deposit-preventing agent to the water before contact with the heated surfaces. Compounds complexing with cations are combined with anionic substances which are capable of salt formation with complex bound cations to form additive compositions which are added to the water in the zone near the walls of vessels or tubular heat exchangers subject to deposit incrustation. Such compositions are formed from cation-complexing compounds comprising a mixture of sulfurous acid esters of di- and/or polysaccharides and carboxymethyl cellulose as cation-complexing compounds, which mixture is combined with anionic substances comprising sulfonated fat by alcohols and/or fatty acids in the weight ratio having a range of from about 80 parts by weight cation-complexing compound to about 20 parts by weight anionic substance to (2) about 95 parts by weight cation-complexing compound to about 5 parts by weight anionic substance, the preferred weight ratio being 85:15 to 90:10 of cation-complexing compound; anionic substance, respectively. These compositions are added to the water in amounts ranging from 10 to 60 milligrams per liter, preferably 20 to 30 milligrams per liter.

Inventors

  • 👤 Norbert Lowicki
  • 👤 Michael Sidillo

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 23:08
CPC Classifications
F; F28; F28F; F28F19/00; C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; F16; F16L; F16L58/00

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 150 words
A composition for use as an additive to water containing dissolved inorganic salts, in an amount of additive of 10 to 60 mg per liter, for preventing formation of deposits on hot metal surfaces, including surfaces of tube heat exchangers, said composition consisting essentially of: (A) sulfurous acid esters of hydrolyzed cane sugar and corn starch having a mole ratio of C 6 H 12 O 6 : SO 2 of at least 1 : 2, (B) carboxymethylcellulose having a molecular weight of between 20 and 30,000, and (C) sulfonated fatty alcohols of the type C 10 to C 18 and/or sulfonated beeswax having fatty acids with about 40% of combined SO 2 , with the amount of (B) being 0.5 to 10% by weight relative to the amount of (A) and the weight ratio of (A) plus (B) to (C) being between 80 : 20 and 95 : 5.
Claim 2
Dependent Claim 150 words
A composition for use as an additive to water containing dissolved inorganic salts, in an amount of additive of 10 to 60 mg per liter, for preventing formation of deposits on hot metal surfaces, including surfaces of tube heat exchangers, said composition consisting essentially of: (A) sulfurous acid esters of hydrolyzed cane sugar and corn starch having a mole ratio of C 6 H 12 O 6 : SO 2 of at least 1 : 2, (B) carboxymethylcellulose having a molecular weight of between 20 and 30,000, and (C) sulfonated fatty alcohols of the type C 10 to C 18 and/or sulfonated beeswax having fatty acids with about 40% of combined SO 2 , with the amount of (B) being 0.5 to 10% by weight relative to the amount of (A) and the weight ratio of (A) plus (B) to (C) being between 80 : 20 and 95 : 5.
Claim 3
Dependent Claim 140 words
Composition according to claim 1, consisting essentially of: (A) sulfurous acid esters of hydrolyzed cane sugar and hydrolyzed Indian corn starch, having a weight ratio of cane sugar to Indian corn starch of 7 : 3 and a mole ratio C 6 H 12 O 6 : SO 2 of at least 1 : 2, (B) carboxymethylcellulose having a molecular weight of between 20 and 30,000, and (C) sulfonated fatty alcohols of the type C 10 - C 18 and sulfonated beeswax having a weight ratio of fatty alcohols to beeswax of 1 : 4 and having about 40% of combined SO 2 , with the amount of (B) being 0.5 to 10% by weight relative to the amount of (A) and the weight ratio of (A) plus (B) to (C) being between 80 : 20 and 25 : 2.
Claim 4
Dependent Claim 26 words
Composition according to claim 1, wherein the composition is adapted to be added to the water in an amount to 20 to 30 milligrams per liter.
Claim 5
Dependent Claim 27 words
Composition according to claim 1, wherein the composition with the weight ratio of (A) plus (B) to (C) is between 85 : 15 and 90 : 10.

References Cited (Backward Citations)

US2046242A Cited
US2097649A Cited
US2728725A Cited
US2893990A Cited
US3188289A Cited
US3463730A Cited
US3596766A Cited
US3849341A Cited
US3723334A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-05-01 1981-10-31 1982-05-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-05-01 1985-10-31 1986-05-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-05-01 1989-10-31 1990-05-02 $7700.00 Window Closed / Lapsed

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