Phosphoric acid, disodium salt, dodecahydrate → Trisodium orthophosphate dodecahydrate

HRID 400257

反応式

HRID 400257 の反応式
[OH2:1].O.O.O.O.O.O.O.O.O.O.O.[P:13]([O-:17])([O-:16])([OH:15])=[O:14].[Na+].[Na+].O.O.O.O.O.O.O.P([O-])([O-])(O)=[O:28].[Na+].[Na+]>>[OH2:14].[OH2:28].[OH2:1].[OH2:14].[OH2:14].[OH2:14].[OH2:14].[OH2:14].[OH2:14].[OH2:14].[OH2:14].[OH2:14].[P:13]([OH:17])([OH:16])([OH:15])=[O:14]

参加物

3

反応物 2

HCID 61456Phosphoric acid, disodium salt, dodecahydrateHCID 6096963Phosphoric acid, disodium salt, heptahydrate

生成物 1

HCID 22062363Trisodium orthophosphate dodecahydrate

実験手順

Disodium hydrogenphosphate dodecahydrate is, however, incongruently melted to generate disodium hydrogenphosphate heptahydrate, which is precipitated at the bottom of the solution. When this solution is cooled, crystal of disodium hydrogenphosphate heptahydrate is grown owing to secondary nucleation (which means herein generation of new nuclear crystal in a supersaturated solution including seed crystal). This makes it impossible to obtain objective disodiun hydrogenphosphate dodecahydrate. In order to avoid the secondary nucleation, it is necessary to heat the solution until disodium hydrogenphosphate heptahydrate is dissolved. However, the solution is required to be cooled down to a temperature of approximately 22° C. to generate disodium hydrogenphosphate dodechydrate crystal in the solution. In this manner, there arises a problem of large supercooling (approximately 13° C.). In order to achieve comfortableness in the heating system for a building or the like, the heat storage material having such large supercooling is lack of practicability. Thus, it is required to suppress the supercooling to be approximately 5° C. or less.

後処理

  1. customis precipitated at the bottom of the solution
  2. temperatureWhen this solution is cooled

出典と根拠

ORDレコード
ord-1741ae044f8a40de84d23e3735e410c7
出典データセット
uspto-grants-1998_10
特許番号
US05827915

関連ノート

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