Fumaric Acid → Calcium

Participants

Reaction Steps

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.

Provenance & Evidence