Preparation of dawsonite
AssigneeJ. M. Huber Corporation
InventorPeter van der Heem
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Abstract
Dawsonite is formed by reacting alumina trihydrate with sodium bicarbonate in a sodium carbonate solution under pressure at a temperature between 100.degree. and 200.degree. C. for 30 minutes to 4 hours. The alumina trihydrate concentration is no greater than 86 grams per liter. The sodium carbonate concentration is between 150 and 300 grams per liter. Sufficient sodium bicarbonate is added to react with all the alumina trihydrate according to the equation: 2Al(OH).sub.3 +2NaHCO.sub.3 =Na.sub.2 O:Al.sub.2 O.sub.3 :2CO.sub. 2 :2H.sub.2 O+2H.sub.2 O The resulting dawsonite is of high purity.
Claims10
A process for the production of dawsonite comprising:
- reacting alumina trihydrate with sodium bicarbonate in a sodium carbonate solution, wherein the alumina trihydrate concentration is no greater than 86 grams/liter of said sodium carbonate solution, wherein the sodium bicarbonate is added in sufficient amount to react with all of the alumina trihydrate according to the equation:
- 2Al(OH).sub.3 +2NaHCO.sub.3 =Na.sub.2 O:Al.sub.2 O.sub.3 :2CO.sub.2 :2H.sub.2 O+2H.sub.2 O
- but is less than 150 grams/liter, wherein the sodium carbonate concentration is from 150 to 300 grams/liter, and the reaction is at between 100.degree. and 200.degree. C. for from 30 minutes to 4 hours at above atmospheric pressure.
Dependencies are inferred from the claim text.