Keywords

• 708-06-5 factory
• Buy 708-06-5
• High quality 2-Hydroxy-1-naphthaldehyde

Quick Details

• ProName: 708-06-5 factory Buy High quality 2-Hy...
• CasNo: 708-06-5
• Molecular Formula: C11H8O2
• Appearance: Crystalline Moist Powder
• Application: Used as dye, fluorescent whitening age...
• DeliveryTime: Stocks
• PackAge: as customer's requirements
• Port: Any port
• ProductionCapacity: 100 Metric Ton/Month
• Purity: 99%
• Storage: Keep in dark place,Sealed in dry,Room ...
• Transportation: By sea By air by courier
• LimitNum: 1 Kilogram
• Heavy metal: 20ppm
• Grade: Industrial Grade

Superiority

708-06-5 factory Buy High quality 2-Hydroxy-1-naphthaldehyde

Colorless needle-like or prismatic crystals. The melting point of 82 deg C, boiling point of 192 deg C (3.6kPa). Soluble in ethanol, ether and petroleum, insoluble in water, soluble in aqueous alkali solution, soluble in concentrated sulfuric acid yellow. Slightly volatile in the steam, iron chloride Brown. Preparation Method: from 2-naphthol and chloroform reaction derived. Ethanol and 2-naphthol were added to the reaction pot, and the mixture was heated to 40 ° C. And stirred for 0.5 hours. Then 30% sodium hydroxide solution was added, and the temperature was raised to 75 °c. Chloroform was added dropwise to control the reaction temperature to 78 °c. After the addition, the temperature was maintained at 78 °c for 2H. Then, the temperature was raised to 90 ° C., and ethanol and excess chloroform were distilled off. After steaming, the mixture was cooled to below 30 ° C., and allowed to stand for 6 hours. The filtrate was filtered, stirred with water, heated to 60 °c and neutralized with hydrochloric acid to a pH of 2-3. Cooling, filtration, drying of the filter cake below 60 °c, to obtain the finished product. Purposes: the product is an intermediate in organic synthesis, but also for the determination of palladium, beryllium Analytical reagents. The fluorescent whitening agent PEB can be synthesized by the ring formation of 2-hydroxy-1-naphthalene formaldehyde and diethyl malonate in the presence of acetic anhydride. Add 28 kg2-hydroxy -1-naphthalene formaldehyde, 29kg of diethyl malonate and 50kg of acetic anhydride into the reaction pot, stir, heat to 130 ℃, Reflux 8H. Heating was stopped and stirring was continued for 1H. It was cooled to 80 °c and allowed to stand for 24h. Filter with suction, wash the cake with 10% soda ash solution, and then wash the cake to Neutral with clear water. The filter cake was then added to 40kg of alcohol and dissolved by heating. Cooling, filtration. The filter cake was washed with a small amount of ethanol, dried at 60 ° C., and pulverized to obtain a standard of 36kg of fluorescent whitening agent PEB. The fluorescent whitening agent PEB is mainly used for the whitening of white materials such as selurolo White Material, polyvinyl chloride, acetic acid fiber and the brightening of coloring materials.

Details

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1. The best price, satisfactory quality;

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3, customers have the right to choose from the recent effective packaging methods of their products packaging methods;

4. When the customer's request is large enough, special requirements can be made, including discount policy;

5. Division I is committed to the customer's package safely delivered to the customer's hands, otherwise we may fully compensate you for the loss;

6. All products of various powders or liquids will arrive within 4 to 7 days.