Classifications

• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/16—Organic compounds
  • C11D3/20—Organic compounds containing oxygen
  • C11D3/2075—Carboxylic acids-salts thereof
  • C11D3/2086—Hydroxy carboxylic acids-salts thereof
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
  • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
  • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances

Definitions

• sequestrant compositions comprising a mixture of (l) a compound selected from the group consisting of citric acid, tartaric acid, polyhydroxy monocarboxylic acids containing from 6 to 8 carbon atoms, and the water soluble salts of said acids and (2) a compound selected from the group consisting of polyhydroxy dicarboxylic acids containing from 5 to 8 carbon atoms and polyhydroxy monocarboxylic ketoacids containing from 6 to 8 carbon atoms and the water-soluble salts of said acids.
• This invention relates to new compositions of matter. More particularly, this invention relates to novel sequestrant compositions comprising a mixture of sequestering agents.
• Polyhydroxy acids such as gluconic acid
• gluconic acid sodium gluconate in the basic medium
• Gluconic acid is a good sequestrant for calcium ions, but it is not nearly as good as alpha-ketoglucom'c acid and the polyhydroxy polycarboxylic acids such as saccharic acid and mucic acid.
• novel compositions of the present invention comprise a mixture of (1) a compound selected from the group consisting of citric acid, tartaric acid, polyhydroxy monocarboxylic acids containing from 6 to 8 carbon atoms, and the water soluble salts of said acids and 3,696,044 Patented Oct. 3, 1972 ice (2) a compound selected from the group consisting of polyhydroxy dicarboxylic acids containing from 5 to 8 carbon atoms, polyhdroxy monocarboxylic ketoacids containing from 6 to 8 carbon atoms, and the water soluble salts of said acids.
• a preferred class of polyhydroxy monocarboxylic acids and water-soluble salts thereof which may be used as a component of the sequestering compositions of this invention includes the compounds characterized by the following generalized formula COO-X (CHOHL;
• polyhydroxy monocarboxylic ketoacids includeZ-ketogulonic acid, 2-ketogluconic acid, S-ketogluconic acid, Z-ketoglucoheptanoic acid, 3-ketogluconic acid, 4-ketogluconic acid, 3-ketogulonic acid, and 4-ketogulonic acid.
• a preferred keto acid is 2-ketogluconic acid.
• sequestering agents are employed in the free acid form or in the salt form.
• compounds (1) and (2) described above may be employed in free acid form or as a water soluble salt.
• Illustrative examples of such salts include the alkali metal and ammonium salts.
• a preferred class of salts includes the sodium and potassium salts.
• the amounts of compounds (1) and (2) described above which may be employed in the sequestering compositions of this invention may vary a wide range and will depend somewhat on the sepcific combination of sequestering agent used, on the cost of the sequestering agent, and on the particular system in which the the sequestering composition is employed.
• the weight ratio of compound 1) to compound (2) is not more than about 100 and at least about 0.05 and preferably at least about 1.
• a particularly preferred weight ratio of compound (1) to compound (2) is from about 2 to about 10.
• a preferred composition of this invention comprises a mixture of about parts by weight of gluconic acid or water-soluble salt thereof and about 25 parts by weight of saccharic acid or water-soluble salt thereof.
• the calcium sequestering ability of the various compositions is determined by the titration of 0.2 gram of the active material with one percent calcium acetate solution and three percent caustic solution in accordance with a modified version of a test described by Mchevretter et al., Industrial Engineering Chemistry, 45,2782 (1953).
• a two percent stock solution of the sequestring agent is prepared, and ten ml. of this stock solution are diluted with ml. of a six percent sodium hydroxide solution and two ml. of two percent sodium oxalate solution.
• the diluted solution is mechanically stirred, and a standard one percent calcium acetate solution is added from a syringe attached to a constant speed syringe pump until a slight haze is observed in the solution.
• the amount of calcium ion added is a measure of the sequestering power of the sequestering agent under test.
• Sodium gluconate a standard of the industry, is arbitrarily assigned a calcium ion sequestering index of 1.00.
• the calcium ion sequestering power of the other sequestrants are calculated based on sodium gluconate.
• disodium saccharate has an index of 2.72 which indicates that disodium saccharate is 2.72 times as effective as sodium gluconate.
• the calculated calcium ion sequestering power is determined by adding the theoretical calcium ion sequestering power of each component of the sequestering composition.
• the sequestering compositions of this invention may be used in any of the numerous ways known in the art for using sequestering agents.
• the sequestering compositions may be used alone or in combination with wetting agents, surfactants, detergent builders, detergent compositions, and other ingredients which are used in the art in combination with sequestering agents.
• a composition comprising a mixture of (1) a compound selected from the group consisting of citric acid, tartaric acid, polyhydroxy monocarboxylic acids containing from 6 to 8 carbon atoms, and the water soluble salts of said acids and (2) a compound selected from the group consisting of polyhydroxy dicarboxylic acids containing from 5 to 8 carbon atoms, polyhydroxy monocarboxylic ketoacids containing from 6 to 8 carbon atoms, and the water soluble salts of said acids.
• composition of claim 1 wherein the polyhydroxy monocarboxylic acid containing from 6 to 8 carbon atoms 2D has the formula COOX wherein n is an integer from 4 to 6 and wherein X is hydrogen or a cation.
• composition of claim 2 wherein the weight ratio r of compound 1) to compound (2) is at least one. 4. A composition of claim 3 wherein compound (1) has the formula HOH 40 HzOH POWER OF SODIUM SACCHARATE, SODIUM GLUCONATE, AND
• n is an integer having a value of from 4 to 6 and X is hydrogen or cation and wherein compound (2) has the formula wherein m is 3 or 4 and Q and D are independently hydrogen or cation.
• composition of claim 2 wherein the ratio of compound (1) to compound (2) is from 2 to 10.
• composition of claim 8 wherein the ratio of compound (1) to compound (2) is from 2 to 10.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• Hydrology & Water Resources (AREA)
• Water Supply & Treatment (AREA)
• General Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Emergency Medicine (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Wood Science & Technology (AREA)
• Detergent Compositions (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Applications Claiming Priority (1)

Publications (1)

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Cited By (32)

Families Citing this family (2)

• 1970
  • 1970-07-02 US US52088A patent/US3696044A/en not_active Expired - Lifetime
• 1971
  • 1971-06-29 CA CA116,939A patent/CA946598A/en not_active Expired
  • 1971-06-30 DE DE19712132509 patent/DE2132509A1/de active Pending
  • 1971-07-01 IT IT51340/71A patent/IT1000014B/it active
  • 1971-07-01 GB GB3086571A patent/GB1304979A/en not_active Expired
  • 1971-07-02 JP JP4815571A patent/JPS5343908B1/ja active Pending
  • 1971-07-02 FR FR7124327A patent/FR2100198A5/fr not_active Expired

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