Physical data editing

1. Property: white to red flaky crystals, darker in color when stored in air for a long time.

2. Density (g/mL, 20/4℃): 1.181.

3. Relative density (20℃, 4℃): 1.25. 4.

Melting point（ºC）：122~123. 5.

Boiling point（ºC，at atmospheric pressure）：285~286. 6.

6. flash point(ºC): 153. 7. solubility: insoluble.

Solubility: insoluble in cold water, soluble in hot water, ethanol, ether, chloroform, benzene, glycerin and lye [1] .

Data editing

1、 Molar refractive index：45.97

2. Molar volume (cm3/mol): 121.9

3、 Isotonic specific volume（90.2K）：326.1

4、 Surface tension（3.0 dyne/cm）：51.0

5、 Polarization ratio (0.5 10-24cm3): 18.22 [1]

Nature and stability

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1. Toxicology is similar to phenol, and it is a stronger corrosive. Strongly irritating to the skin. It is easily absorbed through the skin. Toxic to blood circulation and kidneys. In addition, it can cause corneal damage. Although the lethal amount is unknown, there have been cases of death from topical application of 3 to 4g. Production equipment should be sealed and leak-proof, and should be washed off in a timely manner if splashed on the skin. Workshops should be ventilated and equipment should be airtight. Operators should wear protective gear.

2. Flammable, the color of long storage gradually become darker, stable in the air, but when exposed to the sun gradually become darker. Sublimation by heating, with irritating phenol odor.

3. present in the flue gas. 4.

4. aqueous solution turns green with ferric chloride [1] .

Storage method

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1. Lined with plastic bags, sacks or woven bags, net weight 50kg or 60kg per bag.

2. storage and transportation should be fireproof, moisture-proof, anti-exposure. Stored in a dry, ventilated place. Store and transport according to the regulations of flammable and toxic materials.

Synthetic method

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1. It is made from naphthalene through sulfonation and alkali melting. Sulfonation alkali melting is a widely used production method at home and abroad, but the corrosion is serious, the cost is high and the wastewater biological oxygen consumption is high. The 2-isopropylnaphthalene method developed by American Cyanamid Company takes naphthalene and propylene as raw materials, and produces 2-naphthol and acetone by-products at the same time, which is similar to the case of phenol by isopropylbenzene method. The raw material consumption quota: 1170kg/t fine naphthalene, 1080kg/t sulfuric acid, 700kg/t solid caustic soda.

2. Heat the molten pure naphthalene to 140℃, with the ratio of naphthalene:sulfuric acid = 1:1.085 (molar ratio), the sulfuric acid of 98% in 20min, and the sulfuric acid of 98% in 20min.

The reaction will end when the content of 2-naphthalenesulfonic acid reaches above 66% and the total acidity is 25%-27%, then the hydrolysis reaction will be carried out at 160℃ for 1h, free naphthalenes will be blown away by water vapor at 140-150℃, and then the relative density of 1.14 naphthalenes will be added slowly and evenly at 80-90℃ in advance. Sodium sulfite solution is neutralized until the Congo red test paper does not change blue. Reaction of the sulfur dioxide gas generated in a timely manner with steam removal, the neutralization products cooled to 35 ~ 40 ℃ cooling crystals, sucking the crystals from the filter with 10% salt water, dry, added to the molten state of 98% sodium hydroxide at 300 ~ 310 ℃, stirring and maintain 320 ~ 330 ℃, so that the sodium 2-naphthalene sulfonate base fused to 2-naphthol sodium, and then use hot water to dilute the base melt, and then pass into the above Neutralize the sulfur dioxide generated by the reaction, acidification reaction at 70 ~ 80 ℃ until phenolphthalein was colorless. The acidification products will be static layering, the upper layer of the liquid heated to boiling, static, divided into aqueous layer, the crude product of 2-naphthol first heated dehydration, and then decompression distillation, can be pure product.

3. Extraction and crystallization method to remove the 1-naphthol in 2-naphthol. Mix 2-naphthol and water in a certain proportion and heat to 95℃, when 2-naphthol is melted, stir the mixture vigorously and lower the temperature to 85℃ or so, cool the crystallized slurry product to room temperature and filter. The content of 1-naphthol is traceable by purity analysis. 4.

It is produced from 2-naphthalenesulfonic acid by alkali melting [2].

Storage method

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1. Lined with plastic bags, sacks or woven bags, net weight 50kg or 60kg per bag.

2. storage and transportation should be fireproof, moisture-proof, anti-exposure. Stored in a dry, ventilated place. Store and transport according to the regulations of flammable and toxic materials.

Use

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1. Important organic raw materials and dye intermediates, used in the manufacture of tartaric acid, butyric acid, β-naphthol-3-carboxylic acid, and used in the manufacture of antioxidant butyl, antioxidant DNP and other antioxidants, organic pigments and fungicides.

2. Used as a reagent for the determination of sulfonamide and aromatic amines by thin layer chromatography. It is also used for organic synthesis.

3. It is used to improve cathodic polarization, refine crystallization and reduce pore size in acidic tin plating. Due to the hydrophobic nature of this product, excessive content will cause gelatin condensation and precipitation, resulting in streaks in the plating.

4. Mainly used in the production of acid orange Z, acid orange II, acid black ATT, acid mordant black T, acid mordant black A, acid mordant black R, acid complex pink B, acid complex red brown BRRW, acid complex black WAN, color phenol AS, color phenol AS-D, color phenol AS-OL, color phenol AS-SW, active bright orange X-GN, active bright orange K-GN, active red K-1613, active red K-1613, active bright orange X-GN, active bright orange K-GN. Neutral Purple BL, Neutral Black BGL, Direct Copper Salt Blue 2R, Direct Sunlight Resistant Blue B2PL, Direct Blue RG, Direct Blue RW and other dyes [2].