Fumaric Acid → Calcium

HRID 1086142Notes

Reaction equation

HRID 1086142 reaction equation
[C:1]([OH:8])(=[O:7])/[CH:2]=[CH:3]/[C:4]([OH:6])=[O:5].[OH-].[Ca+2:10].[OH-].C([O-])(=O)/C=C/C([O-])=O>O>[C:1]([O-:8])(=[O:7])/[CH:2]=[CH:3]/[C:4]([O-:6])=[O:5].[Ca+2:10].[Ca:10]

Participants

6

Reactant 3

HCID 444972Fumaric Acid4×HCID 5460307FumarateHCID 6093208Calcium Hydroxide3×

Product 2

HCID 5460341CalciumHCID 6433512(2E)-2-Butenedioic acid calcium salt (1:1)

Reagents, catalysts & solvents 1

HCID 962WaterSolvent4×

Procedure

A calcium fumarate salt was prepared by mixing essentially 1 mole of fumaric acid with 1 mole of calcium hydroxide in the presence of 10 moles of water. 255 g (2.22 moles) of fumaric acid and 163 g of calcium hydroxide (2.22 moles) were dispensed separately in 200 ml of water (total water =400 g or 22.2 moles). The mole ratio of fumaric acid to Ca(OH)2 to water was 1:1:10. The calcium hydroxide slurry was added slowly to the fumaric acid suspension with continuous stirring while controlling the reaction temperature to below 160° F. At about 40% base addition, the fumarate solution became thicker and thicker, behaving like a frosting. Further additions of calcium base resulted in a cement-like mass due to the high concentration of salt-to-water (1:10 mole/mole). At this point the solid mass was discarded as it is of no practical use for the product specifications of this invention.

Workup

  1. customto below 160° F

Sources & evidence

ORD record
ord-f7ca68fdd9334aea985cbe6ae7e95cd6
Source dataset
uspto-grants-1991_07
Patent number
US05028446

Reaction notes

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