methylnaftalen
Methylnaphthalene
CAS: 1321-94-4
Molecular Formula: C11H10
methylnaftalen - Names and Identifiers
| Name | Methylnaphthalene |
| Synonyms | dycar mn tetrosin mnlf methylnaftalen methylnaftalen Methylnaphthalene MEHYL NAPHTHALENE methyl-naphthalen 1-methylnaphthalene Naphthalene, methyl- monomethylnaphthalene monomethylnaphthalene |
| CAS | 1321-94-4 |
| EINECS | 215-329-7 |
| InChI | InChI=1/C11H10/c1-9-5-4-7-10-6-2-3-8-11(9)10/h2-8H,1H3 |
methylnaftalen - Physico-chemical Properties
| Molecular Formula | C11H10 |
| Molar Mass | 142.1971 |
| Density | 1.0381 (estimate) |
| Melting Point | 34°C |
| Boling Point | 229.78°C (estimate) |
| Flash Point | 82.2°C |
| Vapor Presure | 0.0518mmHg at 25°C |
| Refractive Index | 1.6085 (estimate) |
| Physical and Chemical Properties | 1-methylnaphthalene: colorless oily liquid. Has a smell similar to that of naphthalene. Can be volatilized with the vapor. The relative density was 1.0202. Melting Point -32 °c. Boiling point 244.6 C, 107.4 C (1.333 X 103Pa). Refractive index 1.6170. Flash point 82 °c. Insoluble in water, slightly soluble in benzene, soluble in ethanol and ether. Rat oral ld504360 mg/kg. 2-methylnaphthalene: a colorless monoclinic crystal precipitated from ethanol. The relative density was 1.0058. Melting point 34.58 °c. Boiling point 241 C, 104.7 C (1.333 X 103Pa). Refractive index 1.6015(40 degrees C). Flash point 97 degrees Celsius. Insoluble in water, soluble in benzene, soluble in ethanol, ether. The overview of methyl naphthalene, physical and chemical properties, preparation method, application is by Ding red editing. (2015-12-28) |
| Use | Used as surfactant, water reducing agent, dispersant, drug and other organic synthesis of raw materials |
methylnaftalen - Risk and Safety
| UN IDs | 3082 |
| Hazard Class | 9 |
| Packing Group | III |
methylnaftalen - Upstream Downstream Industry
| Raw Materials | Sulfuric acid Sodium hydroxide |
methylnaftalen - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | methylnaphthalene, a naphthalene homolog with a hydrogen atom substituted by a methyl group on the naphthalene ring, is one of the high-temperature coal tar processing products, there are two isomers, namely 1-methyl naphthalene (also known as α-methyl naphthalene) and 2-methyl naphthalene (also known as β-methyl naphthalene), mainly from coal tar and petroleum processing in some by-products, it is obtained by distillation; It can be used as a raw material for chemical industry, medicine, dye and other industries, in which 1-methylnaphthalene has good dissolving ability to organic matter, it can be used as a carrier for printing and dyeing, a solvent for insecticides and anti-plague agents, etc. The mixture of 80% 1-methylnaphthalene and 20% 2-methylnaphthalene is a eutectic with a freezing point of -48 ℃, can be used as a heat carrier and solvent; 1-methyl naphthalene can also be used as a standard fuel for the determination of the number of diesel oil and the determination of the number of theoretical plates of the distillation column; 2-methyl naphthalene can be used as a penetrating agent, lubricating oil flow point reducing agent and solvent, etc., can also be used for the production of treatment of vascular sclerosis drugs and feed additives. |
| preparation method | preparation of 1-methylnaphthalene the distillation wash oil fraction is cut from the distillation range of 240~245 ℃ methyl naphthalene fraction, the methyl naphthalene fraction was cooled to -20 °c, and the crude 2-methyl naphthalene crystals were isolated, and the resulting mother liquor was used to extract 1-methyl naphthalene. After 95-98% concentrated sulfuric acid was added to the mother liquor for sulfonation, the unsulfonated oil was separated and removed, and then diluted with water to precipitate crystals of 1-methylnaphthalene sulfonic acid at 10 °c. After filtration of the crystals, the aqueous layer is removed by hydrolysis with superheated steam at 125 to 150 ° C. To obtain commercially pure 1-methylnaphthalene with a purity of 85 to 90%. 1-methyl naphthalene with purity more than 98% can be obtained by repeated sulfonation and hydrolysis of industrial pure 1-methyl naphthalene for 2-3 times. Preparation of 2-methylnaphthalene the distilled wash oil fraction was cut therefrom to obtain a methylnaphthalene fraction with a distillation range of 240-245 ° C. The methylnaphthalene fraction was cooled to -20 ° C., and crude 2-methylnaphthalene crystals were separated. The crude 2-methylnaphthalene was recrystallized from ethanol or methanol. The obtained crystals were subjected to centrifugal separation and heated melt filtration to remove impurities, and 2-methylnaphthalene having a purity of 97% or more was obtained. |
| Application | 1-methylnaphthalene for vinyl chloride fiber and polyester dyeing carrier surfactant, heat carrier, pharmaceutical intermediates, sulfur extractant, can be used for the production of plasticizers, fiber dyeing AIDS. It can also be used as a solvent for the determination of diesel oil, pesticide and pesticide, and a solvent for the production of hydrogen peroxide by anthraquinone method. It can also be used to produce the plant growth regulator 1-naphthylacetic acid. 2-methyl naphthalene is mainly used to produce vitamin K3, polyester fiber chromosome carriers, fiber dyeing aids, organic pigments, concrete additives, detergents, emulsifiers, hemostatic agents, wetting agents, plant growth regulators, beverage additives, feed Additives, oral contraceptives and color film dyes. 3. Mixed methyl naphthalene can be used as raw materials for medicine and surfactant. In addition, methyl naphthalene can be treated by HF/BF3 catalysis to prepare Mesophase pitch, which is a high quality raw material for preparing carbon fiber. |
| Application | used as surfactant, water reducer, dispersant, raw materials for organic synthesis such as drugs methylnaphthalene is the main raw material for the production of disperse dye auxiliaries (dispersants), and can also be used as heat carriers and solvents, surfactants, sulfur extractants, and plasticizers, fiber dyeing AIDS can also be used to determine the Alkane number and the number of the standard fuel. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 02:00:04
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Raw Materials for methylnaftalen