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18162-48-6872-50-4Methylene ChloridenaphthaleneTHFTitanium Dioxide
ChemicalBook CAS DataBase List 4,5-dihydroxybenzene-1,3-disulphonic acid

4,5-dihydroxybenzene-1,3-disulphonic acid synthesis

8synthesis methods
4,5-dihydroxybenzene-1,3-disulphonic acid is produced by sulfonation of pyrocatechol with oleum or by alkali fusion of 2-hydroxy-1,3,5-benzenetrisulfonic acid: 10 kg of the tetrasodium salt of phenoltrisulfonic acid is introduced into 16 kg of sodium hydroxide at about 20 ℃. After adding some water, the temperature is gradually raised to 160 ℃; at the end of the reaction the melt is diluted with water and acidified with sulfuric acid, and sulfur dioxide is driven off. After cooling, precipitated sodium sulfate is removed by filtration and excess sulfate ions are precipitated in fractions. Finally the barium salt, which has poor solubility in cold water, is precipitated.
120-80-9 Synthesis
Catechol

120-80-9
491 suppliers
$13.00/25g

4-sulfocatechol

7134-09-0
8 suppliers
inquiry

4,5-dihydroxybenzene-1,3-disulphonic acid

149-46-2
4 suppliers
inquiry

Calcium Dobesilate Hydrate Impurity 2

35857-70-6
6 suppliers
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Yield:35857-70-6 21 % Spectr. ，7134-09-0 73 % Spectr. ，149-46-2 4 % Spectr.

Reaction Conditions:

with sulfuric acid in water at 25; for 28.6111 h;Rate constant;Product distribution;various reagent concentration, reaction times;

References:

Cerfontain, Hans;Coenjaarts, Norbert J.;Koeberg-Telder, Ankie [Recueil des Travaux Chimiques des Pays-Bas,1988,vol. 107,# 4,p. 325 - 330]

149-45-1 Synthesis
Tiron

149-45-1
233 suppliers
$30.00/10g

4,5-dihydroxybenzene-1,3-disulphonic acid

149-46-2
4 suppliers
inquiry

References
120-80-9 Synthesis
Catechol

120-80-9
491 suppliers
$13.00/25g

4,5-dihydroxybenzene-1,3-disulphonic acid

149-46-2
4 suppliers
inquiry

References
4-sulfocatechol

7134-09-0
8 suppliers
inquiry

4,5-dihydroxybenzene-1,3-disulphonic acid

149-46-2
4 suppliers
inquiry

References
120-80-9 Synthesis
Catechol

120-80-9
491 suppliers
$13.00/25g

4-sulfocatechol

7134-09-0
8 suppliers
inquiry

4,5-dihydroxybenzene-1,3-disulphonic acid

149-46-2
4 suppliers
inquiry

References

4,5-dihydroxybenzene-1,3-disulphonic acid Related Search:

Catechol