Sulfuric Acid → Dichromate ion

HRID 275240

反応式

HRID 275240 の反応式
[Cr:1]([O-:5])([O-:4])(=[O:3])=[O:2].[Na+:6].[Na+].S(=O)(=O)(O)O.S(=O)(=O)(O)[O-].[Na+]>>[O-:2][Cr:1]([O:5][Cr:1]([O-:4])(=[O:3])=[O:2])(=[O:4])=[O:3].[Na+:6].[Na+:6].[O-:2][Cr:1]([O:5][Cr:1]([O-:4])(=[O:3])=[O:2])(=[O:4])=[O:3]

参加物

5

反応物 3

HCID 1118Sulfuric AcidHCID 24488Sodium ChromateHCID 516919Sodium Bisulfate

生成物 2

HCID 24503Dichromate ionHCID 25408Sodium Dichromate

実験手順

Chromic acid and sodium bichromate or sodium chromate are made by roasting chromium-containing ore with soda ash (sodium carbonate) or sodium hydroxide to form sodium chromate. The roasted ore is quenched in water and the soluble sodium chromate dissolves in the water to form "yellow liquor." The sodium chromate is reacted with sulfuric acid or sodium bisulfate to produce sodium bichromate (the "bichromate process"). Upon evaporation, by-product sodium sulfate crystallizes and is filtered off. Because it is contaminated with about 200 to about 1600 ppm of hexavalent chromium, it can be sold only to low value markets such as the pulp and paper industry, and the chromium values in it are lost. Increasingly, environmental considerations limit the sale of sodium sulfate to a maximum chromium contamination of 1000 ppm.

後処理

  1. customThe roasted ore is quenched in water
  2. dissolutionthe soluble sodium chromate dissolves in the water
  3. customto form "yellow liquor

出典と根拠

ORDレコード
ord-f2cc05832eb047f88a8517266b7c8eb5
出典データセット
uspto-grants-1995_02
特許番号
US05393503

関連ノート

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