Citric Acid → Aluminum Sulfate

HRID 1447976Notes

Reaction equation

HRID 1447976 reaction equation
O=C(O)[C@@H]([C@H]([C@@H]([C@@H](CO)O)O)O)O.C(O)(=O)CC(CC(O)=O)(C(O)=O)O.[OH-].[Na+].O=[Al-:30]=O.[Na+].[OH:33][S:34]([OH:37])(=[O:36])=[O:35]>O>[S:34]([O-:37])([O-:36])(=[O:35])=[O:33].[Al+3:30].[S:34]([O-:37])([O-:36])(=[O:35])=[O:33].[S:34]([O-:37])([O-:36])(=[O:35])=[O:33].[Al+3:30]

Participants

7

Reactant 5

HCID 311Citric AcidHCID 1118Sulfuric AcidHCID 10690Gluconic Acid2×HCID 14766Sodium aluminateHCID 14798Sodium Hydroxide

Product 1

HCID 24850Aluminum Sulfate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent2×

Procedure

This example shows the formation of an alumina using gluconic acid, a mono-carboxylic acid, as an additive and serves as a comparison for example 2 which contains citric acid, a polycarboxylic acid. 20.25 gallons of water were heated to 125° C. 130 grams of NaOH and 2250 grams of sodium aluminate having a 1.14 molar ratio of Na2O/Al2O3 and containing 46% Al2O3 were added with good mixing to a container. 235 ml of a 50% gluconic acid solution and 75 ml of a 50% Na2SiO3 solution were added to the mixture with continued mixing. In a separate container, a solution of aluminum sulfate was prepared by mixing 9 gallons of water, 165 ml. concentrated H2SO4 and 34.75 lbs. of Al2 (SO4)3 18H2O. This solution was titrated into the reaction vessel at a rate of about 500 ml. per minute. The final pH of the reaction mixture which contained precipitated aluminum hydroxide was 8.8 at a temperature of 122° F. The gel was dewatered by filtering on buchner funnels.

Workup

  1. additionwere added
  2. additionwith good mixing to a container
  3. customThe final pH of the reaction mixture which contained precipitated aluminum hydroxide
  4. customat a temperature of 122° F
  5. filtrationby filtering on buchner funnels

Sources & evidence

ORD record
ord-8062a40d21594df0a8781b7ce027ceb5
Source dataset
uspto-grants-1979_12
Patent number
US04179411

Reaction notes

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