Keywords

• High purity 15086-94-9
• lowest price 15086-94-9
• 15086-94-9 manufacturer

Quick Details

• ProName: High purity 15086-94-9 lowest price S...
• CasNo: 15086-94-9
• Molecular Formula: C20H8Br4O5
• Appearance: Orange red crystalline powder
• Application: Biochemical research Biological sta...
• DeliveryTime: Stocks
• PackAge: according to customers' requirements
• Port: Any port
• ProductionCapacity: 100 Metric Ton/Day
• Purity: 99%
• Storage: Inert atmosphere,Room Temperature
• Transportation: By air(EMS or EUB or FedEx or TNT ect....
• LimitNum: 1 Gram

Superiority

High purity 15086-94-9  lowest price Solvent Red 43 manufacturer

according to the 2015 edition of "cosmetic safety technical specification", brominated fluorescein cosmetic dyes include 4 ',5'-dibromofluorescein, 2 ',4',5 ',7'-tetrabromofluorescein, 2 ',4',5 ',7'-tetrabromo-4, 7-dichlorofluorescein, 2 ',4',5 ',7'-Tetrabromo-4, 5,6, 7-tetrachlorofluorescein. These four dyes and their respective disodium salt dyes or lakes are allowed to be used for coloring cosmetics. Among them, 2 ',4',5 ',7'-tetrabromofluorescein is solvent red 43, also known as 2 ',4',5 ',7'-tetrabromo-3', 6 '-dihydroxyspiro [isopropylfuran -1(3H),9'(9H)-ton]-3-one, it is a dye and pigment

solvent red 43 is prepared as follows: add 61.0g of sodium hypochlorite solution (10%,86mmol) into a 250mL four-mouth flask, place an ice water bath externally, start stirring, add about 36g of water, 24.3g of 32% liquid alkali, slowly drip 13.9g of bromine (99%,86mmol) after the material temperature reaches 0~5 ℃, control the reaction temperature below 15°C. Determine the content (about 20% effective bromine) and reserve. Add 250g acetic acid into a 500mL four-mouth flask, start stirring, add 13.6g fluorescein (97.5%,40mmol), raise the temperature to 50~60 ℃, and stir quickly (300~400rpm) for 30min. The temperature was reduced to 25-30 ℃, and 134.0g of the above sodium hypobromite solution (20%,168mmol) was slowly added dropwise within 3-4 hours, during which the reaction temperature was controlled at 25-30 ℃. Heat preservation and stirring for 2 hours, sampling for liquid phase detection of bromination endpoint. Add appropriate amount of sodium bisulfite to eliminate residual hypobromous acid. Cooling to 15 ℃, suction filtration, crude filter cake. The crude filter cake is evenly beaten and filtered in about 100mL dilute hydrochloric acid aqueous solution (1 500), and desalting is repeated 3 times. The filter cake was dried at 100 ℃ to obtain 25.0g of light pink target product solvent red 43(HPLC purity 97.8%, content 97.8%,37.7mmol) with 94.3% yield.

Details

Established in 2010, located in Hangzhou Qinglan science park, lingruichem is a technical company mainly focus on the Custom synthesis, manufacturing, sales of chemicals tovarious industries.n our R&D centre. we have a staff of skilled and experienced research chemists. This has enabled us to meet the special reauirements of our customers and it has enabled us to provide quality products at competitive prices.

1. How can we guarantee quality

Always a pre-production sample before mass production;

Always final Inspection before shipment; 

2.What can you buy from us

Plant Extracts,Cosmetics Raw Materials,Vitamin Raw Materials,Pharmaceutical Raw Materials and Intermediates

3. Why should you buy from us not from other suppliers

Our company mainly devoted in producing pharmacetical intermediates , Vitamins , and health supplement , the quality and technical content can reach the advance level in China .Our products are sold well in China as well as in more than 20 countries.

Lingrui's credo is committed to your reliable business partner,reliable quality, competitive prices and superior service, lf you are interested in any of our products or would like to discuss a custom order, please feel free to contact us. We are looking forward to forming successful business relationships with new clients around the world in the near future !