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1-Methylnaphthalene

1-Methylnaphthalene structure

CAS No:
90-12-0
Formula:
C11H10
Chemical Name:
1-Methylnaphthalene
Synonyms:
Naphthalene,1-methyl-;1-Methylnaphthalene;α-Methylnaphthalene;NSC 3574;Methynaph H;Mechinafu H
Categories:
Organic Chemistry > Hydrocarbons and Derivatives

Description

1-Methylnaphthalene has an earthy, phenolic odor Colorless liquid. Insoluble in water; soluble in alcoholand ether. Combustible.

1-Methylnaphthalene Basic Attributes

Molecular Weight：

142.2

Exact Mass：

142.20

BRN：

506793

EC Number：

201-966-8

HScode：

29029080

Characteristics

PSA：

XLogP3：

3.87

Appearance：

Clear colorless to yellow Liquid

Density：

1.025 g/cm³

Melting Point：

-22 °C

Boiling Point：

240-243 °C

Flash Point：

180 °F

Refractive Index：

1.617

Water Solubility：

H2O: 0.026 g/L (25 ºC)

Storage Conditions：

2-8°C

Vapor Pressure：

Vapour pressure, Pa at °C: 7.2

Vapor Density：

Relative vapour density (air = 1): 4.9

Toxicity：

Oral-Rat LD50: 1840 mg/kg

Flammability characteristics：

Inflammable in case of open flame, high temperature, oxidant; burning produces irritating smoke

Explosive limit：

0.7-6.5%(V)

Safety Information

Packing level：

III

Hazard category：

Transport codes：

UN 3082 9/PG 3

wgk germany：

hazard class code：

22-36/37/38-42/43-51/53-39/23/24/25-23/24/25-20/21/22

safety instructions：

7-26-36/37/39-61-45-36/37-23-36

RTECS Number：

QJ9630000

Marks：

Xn,N,T

Storage features：

Treasury is ventilated, low temperature and dry; stored separately from oxidant

Stability/Shelf Life：

Stable. Combustible. Incompatible with strong oxidizing agents, oxygen.

Precautionary statement(s)：

P273-P301 + P312 + P330-P391-P501

Hazard Statements：

H302-H411

Toxicity

Toxicity class：

moderately toxic

1-Methylnaphthalene Use and Manufacturing

Methods of Manufacturing

1-Methylnaphthalene mainly exists in naphthalene oil fraction (content 3.45%) and washing oil fraction (content about 5.4%). 1. After extracting thiaindene from naphthalene oil fraction, the residual oil at the bottom of the tower and the wash oil fraction are washed with acid and alkali. The neutral oil is subjected to preliminary distillation, and the crude methyl naphthalene fraction at 230-270℃ is cut out, and the cut amount is used as raw material 25-30%, not less than 60 theoretical trays, rectification in the rectification tower, using a reflux ratio of 20:1, cut the 240-250 ℃ methyl naphthalene fraction. The methyl naphthalene fraction is redistilled once again in a rectifying tower with the same tower efficiency, and the crystallizable fraction at 237-241°C and the non-crystallized fraction at 241-245°C are cut out. The crystallizable fraction is frozen to -10--20°C, and 2-methylnaphthalene is prepared by centrifugal separation or squeezing crystallization method. Combine the filtrate with the above non-crystallized fractions, wash with 95-98% concentrated sulfuric acid containing 3-5% of the raw material, neutralize with alkali, wash and remove water, and then fractionate the fraction less than 241℃ on the high-efficiency distillation tower , Use low-temperature freezing to remove crystals to obtain over 95% of technical grade 1-methylnaphthalene. After repeated sulfonation and hydrolysis, refined products with 98% purity can be obtained. 2. It contains about 0.8%-1.2% in high temperature tar. Dephenolate the wash oil fraction at 230-300°C. After depyridine alkali, rectify and cut the methylnaphthalene fraction at 240-245°C and freeze it to -20°C. When β-methylnaphthalene precipitates, the fraction that does not crystallize at -20°C is the α-methylnaphthalene fraction. After sulfonation and hydrolysis, industrial pure products can be obtained.

Uses

Raw materials for the production of high-efficiency whitening agents; determination of the octane number and cetane number of diesel fuel; raw materials for pesticide emulsifiers, plant growth stimulating hormone α-naphthalene acetic acid, surfactants, solvents, etc.

Downstream Products

Cyclohexane

Menadione

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