Model No.: LYN-573-58-0
Name: Congo Red
Density: 0.995 G/mL At 25 °C
MP: 360 °C(lit.)’>>360 °C(lit.)
Packaging: Drum & Bag & As request
Productivity: 10000kg per month
Brand: zhishang chemical
Place of Origin: Shandong China (Mainland)
Supply Ability: 10000kg
Certificate: ISO CE
HS Code: 573-58-0
High quality Congo Red cas 573-58-0
Congo red is an acid-base indicator that is blue when pH is below 3.0 and red when pH is above 5.2. The formula is C32H22N6Na2O6S2. Molecular weight 696.66 g/mol.
1. After diazotization of aniline, it is coupled with sodium 1,4-aminonaphthalenesulfonate and then salted out; filtered and dried. The specific operation was as follows: 48.4g of benzidine was dissolved in 300ml of hydrochloric acid (containing 20ml of concentrated hydrochloric acid), cooled to below 5°C with ice, and after 30ml of concentrated hydrochloric acid was added, a 10% aqueous solution of 14.4g of sodium nitrite was added. After the completion of diazotization, the diazonium salt solution was slowly added to a solution of 150 g of p-aminonaphthalene sulfonate and a small amount of water. After standing for half an hour, 35 g of sodium carbonate was slowly added under thorough stirring to make the solution alkaline. Sex, heated to about 80 °C, cooled, filtered, washed with saturated brine and dried to obtain the finished product. Industrial raw material consumption (kg/t) benzidine (100%) 20
0 Sodium aminonaphthalene sulfonate (100%) 52
0 Sodium Nitrite (Industrial) 16…
Has been widely used in cotton; viscose dyeing, because of its easy to change into blue acid, and without proper treatment methods to improve its wet handling fastness, so since the advent of insoluble azo dyes and direct acid red 4BS, The use of this product in the dyeing decreases, but in the paper industry, the amount of large. Can also be used as an indicator of acid and alkali, Congo red test paper, pH 0 (blue violet) – 0 (red). It is also used for biological staining and analysis reagents. Used as an adsorption indicator for the determination of halides, thiocyanates and zinc. Used as a color-developing reagent for the determination of thiophosphate herbicides by TLC. Also used as a biological stain.
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1> Cosmetic Raw Materials: Cosmetics is a variety of raw materials through a reasonable deployment of processing from the compound mixture. Cosmetics with a wide range of raw materials, different performance. According to the Raw Material properties and uses of cosmetics, can be divided into matrix materials and auxiliary raw materials in two categories.
2> Active Pharmaceutical Ingredients(API): API refers to the raw materials in the production of various types of preparations, which is the active ingredient in powder,crystal and paste for medicine use through chemical synthesis,plant extract, and preparations of biotechnology institute.
3> Fragrance And Spices: Spices are an important part of fine chemicals, it is composed of natural spices, synthetic spices and single fragrance.
4> Organic Raw Material: Intermediates are also known as organic intermediates. The use of coal tar or petroleum products as raw materials to produce dyes, resins, additives, and other intermediates.
5> Chemicals Used In Paints: Paint, the traditional Chinese name is paint. So-called coating is coated on the surface of the object that be protected or be adornment, and with the continuous film coating to form strong adhesion.
6> Pharmaceutical Intermediates: The so-called pharmaceutical intermediates, refers to the production of pharmaceutical products in the process, the use of raw materials, materials, accessories and other intermediate products.
7> Agricultural Chemicals: Research and agriculture related chemical, including pesticide, plant growth regulator, fertilizer, compound fertilizer, herbicide etc.