Preparation and application of sodium indigo disulfonate

Sodium indigo disulfonate is a chemical drug. Its molecular formula is C16H8N2Na2O8S2, and its water solubility is 1 G / 100 ML (25 C). Let's introduce the preparation of sodium indigo disulfonate.

Preparation of sodium indigo disulfonate(http://www.hnhbsj.com)
[preparation method I]
Use concentrated sulfuric acid or combined with a small amount of fuming sulfuric acid to make indigo. After sulfonation, the water is diluted with appropriate amount of water, neutralized by sodium carbonate or sodium hydroxide, salted out by sodium sulfate or sodium chloride, and then refined.

[preparation method II]
In the presence of concentrated sulfuric acid, a colorless matrix was synthesized from bis (dimethylaminodiphenyl) methanol and 2-hydroxylnaphthalene-3o 6-disulfonic acid, and oxidized to triarylmethane pigment by manganese dioxide in weak acid solution.

Diphenyl methanol is obtained from manganese dioxide and sulfuric acid oxidation of tetraalkyl diaminodiphenyl methane. The cake can be condensed directly by centrifugal separation. Manganese dioxide is prepared by fresh preparation of manganese sulfate and potassium permanganate in sodium carbonate solution.

[preparation method III]
The edible indigo is actually disodium indigo disulfonic acid, sulfonated by indigo with concentrated sulphuric acid, diluted with water after sulfonation, neutralized with soda, salted out by adding sodium chloride, filtered, washed and dried. Preparation of indigo aluminum lake

Aluminum hydroxide was prepared from aluminum chloride, aluminum sulfate and sodium carbonate, and then added to indigo aqueous solution to precipitate the product.

[preparation method IV]
Indigo powder was sulfonated by concentrated sulfuric acid, diluted with water, neutralized with sodium carbonate, then salted out. Indigo powder (100%) is consumed 210 kg per ton of product.

Application of sodium indigo disulfonate(http://www.hnhbsj.com)
1.Redox indicator. A reagent for the testing of nitrates and chlorates in milk. The staining of a nucleus, such as a Nikki's body.
2. Determination of renal function.
3. Food blue pigment. Generally used for toning. Because of its instability, low fastness, weak dyeing, the most suitable for dark tone. Can be modulated into chocolate, green, red bean, brown, brown. Used in cakes, cold drinks, cool drinks, dosage 5 ~ 100 mg / kg.
4, as food coloring agent, our country regulation can be used in red and green silk, the maximum usage is 0.20 g / kg; In fruit juice, carbonated drinks, wine, candy, pastries, tinned cherries (for decoration), green plum, the maximum usage is 0.10 g / kg, and the maximum amount used in impregnated vegetables is 0.01 g / kg ·kg ~ (-1) ·kg ~ (-1) in pickled vegetables.

The material comes from the network.
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