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o-Xylene

Xylene refers to the aromatic hydrocarbon with the two hydrogen atoms on the benzene ring being substituted by two methyl groups. It has three isomers o-xylene (1, 2-Dimethylbenzene), m-xylene and p-xylene. The industrial products are the mixtures of the three isomers with 10% o- 10%, 70% m-, and 20% p-. In the coking industry, it is one of crude benzene refined products.
o-Xylene Suppliers list
Company Name: Mainchem Co., Ltd.
Tel: +86-0592-6210733
Email: sales@mainchem.com
Products Intro: Product Name:1,2-Dimethylbenzene
CAS:95-47-6
Company Name: career henan chemical co
Tel: +86-371-86658258
Email: sales@coreychem.com
Products Intro: Product Name:o-Xylene
CAS:95-47-6
Purity:as customer's need Package:1kg;1USD
Company Name: NINGBO INNO PHARMCHEM CO., LTD.
Tel: 13867897135
Email: sales@nbinno.com
Products Intro: Product Name:Di-Methyl1,2-Benzene
CAS:95-47-6
Company Name: Beijing Universal Century Technology Co., Ltd.  Gold
Tel: 400-8706899
Email: hysj_bj.com
Products Intro: Product Name:1,2-DiMethylbenzene
CAS:95-47-6
Purity:99.00% Package:100G(ML).250G(ML).500G(ML),1KG(L),25KG(L)
Company Name: J & K SCIENTIFIC LTD.  
Tel: 400-666-7788 +86-10-82848833
Email: jkinfo@jkchemical.com;market6@jkchemical.com
Products Intro: Product Name:o-Xylene, 99%, SuperDry, water≤30 ppm, J&KSeal
CAS:95-47-6
Purity:99% Package:100ML;1L;2.5L

Lastest Price from o-Xylene manufacturers

  • o-Xylene
  • US $1.00 / kg
  • 2018-12-20
  • CAS:95-47-6
  • Min. Order: 1kg
  • Purity: as customer's need
  • Supply Ability: 1000L
o-Xylene Chemical Properties
Melting point -26--23 °C(lit.)
Boiling point 143-145 °C(lit.)
density 0.879 g/mL at 20 °C(lit.)
vapor density 3.7 (vs air)
vapor pressure <0.1 atm ( 21.1 °C)
refractive index n20/D 1.505(lit.)
Fp 90 °F
storage temp. 0-6°C
solubility water: partially soluble0.1705 g/L at 25°C
form Solid or Crystalline Powder
color Yellow to beige
OdorBenzene-like; characteristic aromatic.
explosive limit1.0-7.6%(V)
Water Solubility Sparingly soluble in water. (0.2g/L)
λmaxλ: 288 nm Amax: 1.00
λ: 300 nm Amax: 0.40
λ: 325 nm Amax: 0.05
λ: 350-400 nm Amax: 0.01
Merck 14,10081
BRN 1815558
Stability:Stable. Incompatible with oxidizing agents. Flammable. Hygroscopic.
InChIKeyCTQNGGLPUBDAKN-UHFFFAOYSA-N
CAS DataBase Reference95-47-6(CAS DataBase Reference)
NIST Chemistry ReferenceBenzene, 1,2-dimethyl-(95-47-6)
EPA Substance Registry SystemBenzene, 1,2-dimethyl-(95-47-6)
Safety Information
Hazard Codes Xn,T,F
Risk Statements 10-20/21-38-39/23/24/25-23/24/25-11
Safety Statements 25-45-36/37-16-7
RIDADR UN 1307 3/PG 3
WGK Germany 2
RTECS ZE2450000
Autoignition Temperature867 °F
TSCA Yes
HazardClass 3
PackingGroup II
HS Code 29024100
Hazardous Substances Data95-47-6(Hazardous Substances Data)
MSDS Information
ProviderLanguage
SigmaAldrich English
ACROS English
o-Xylene Usage And Synthesis
XyleneXylene refers to the aromatic hydrocarbon with the two hydrogen atoms on the benzene ring being substituted by two methyl groups. It has three isomers o-xylene (1, 2-Dimethylbenzene), m-xylene and p-xylene. The industrial products are the mixtures of the three isomers with 10% o-10%, 70% m-, and 20% p-. In the coking industry, it is one of crude benzene refined products.
Xylene is a kind of colorless flammable liquid; the melting point of o-, m-and p-xylene is-25.2 ℃,-47.9 ℃ and 13.3 ℃; the boiling points are respectively 144.4 ℃, 139.1 ℃ and 138.3 ℃ while the relative density is 0.8802, 0.8642 and 0.8611, respectively; It is not soluble in water but miscible with many kinds of organic solvents immiscibility. Upon catalytic oxidation, they respectively, generate phthalic anhydride, isophthalic acid and terephthalic acid.
Xylene is one kind of important raw materials of organic chemicals, naturally existing in coal tar and some kinds of petroleum. It can be obtained through the fractionation of the light oil part of the coal tar or catalytic reforming light gasoline. Industry mainly performs extracting using the C8 fraction in the naphtha reformates. It can be alternatively manufactured through the disproportionation reaction of toluene in the presence of catalyst and high temperature, high pressure. At present time, industry mainly applies the method of cryogenic crystallization, adsorption and formation of complexes or molecular sieves to separate them. O-xylene has a relatively high boiling point, being able to be separated using distillation. p-xylene also has a high melting point and can be purified through fractional crystallization purification. Mixed xylene without separation can be directly used as a solvent with being supplemented to the gasoline capable of improving the anti-explosive properties. They are components of aviation gasoline. O-xylene is mainly used for the preparation of phthalic anhydride, which is an important raw material for the manufacture of a variety of dyes and indicators (such as phenolphthalein). In addition, o-xylene can also be used for preparation of polyester resin, insect repellent, plasticizers and dyes. M-xylene, through nitration and reduction, can generate 4, 6-dimethyl-1, 3-phenylenediamine that is the intermediate for synthetic dyes. M-xylene can also be used as the raw materials for synthetic fragrances (such as xylene musk). P-xylene is mainly used in the manufacture of terephthalic acid, which is an important raw material for synthetic polyester fiber (polyester).
  the chemical structure of the three isomers of xylene, ortho-xylene, m-xylene, p-xylene chemical structure
Figure 1 the chemical structure of the three isomers of xylene, ortho-xylene, m-xylene, p-xylene chemical structure.
The above information is edited by Chemicalbook.
Precision Distillation for separation of O-xylene and p-xyleneXylene is presented in coked crude benzene and petroleum cracked oil. Crude benzene, after initial distillation, sulfuric acid washing and distillation for separation of benzene and toluene, followed by distillation, we can obtain xylene, also known as coking xylene. The quality of the coked xylene depends on the separation capacity of the distillation column, the temperature at the top of the column and the reflux ratio. China has classified the coking xylene products into three levels. The coking xylene generally contains 16% if o-xylene, 50% of m-xylene, 21% of p-xylene and 7% of ethylbenzene. The xylene produced in the petroleum industry has a low content of m-xylene and a high content of ethylbenzene. Industrial xylene is not only the solvent and additive of rubber and coatings industry, but also the additives of aviation and power fuel. O-xylene, m-xylene and p-xylene separated from industrial xylene are the raw materials of phthalic acid, isophthalic acid and terephthalic acid, respectively. Phthalic acid and terephthalic acid are used in the production of plasticizers, polyester resins and polyester fibers. M-xylene can be used alone as solvent and fuel additives. The o-xylene contained in the industrial xylene has a over 5.2 ℃ difference with other isomers. With precision distillation, we can obtain o-xylene with a purity of over 95%, followed by using sulfonation and distillation for purification so we can get further purer o-xylene. 
Xylene belongs to Lewis base, which can form a polar complex with HF-BF3 (Lewis acid). The alkalinity of M-xylene is about 100 times as strong as that of other C8 aromatics. When the isomer mixture of xylene comes into contact with HF-BF3 solvent, m-xylene can form a complex with fluoride and is preferentially extracted into the fluoride phase. The m-xylene-containing fluoride phase is heated at a lower pressure to decompose the complex, thereby separating m-xylene from the mixture. HF-BF3 solvent can be recovered by distillation for recycling. If the raw material is a mixture of ortho-xylene, m-xylene and p-xylene, after the m-xylene is extracted, we can further use precision distillation to separate the o-xylene and p-xylene.

Figure 2 the precision distillation method for separation of o-xylene and p-xylene.
Chemical propertiesIt appears as colorless transparent liquid with aromatic odor. It is miscible with ethanol, ethyl ether, acetone and benzene but insoluble in water.
Uses(1)  It is mainly used in the production of phthalic anhydride
(2)  O-xylene is the raw material for the production of germicide fenramine, tetrachlorophenyl peptide and the herbicide bensulfuron-methyl. It is used as intermediate for the manufacture of o-methyl benzoic acid.
(3)  It is mainly used as chemical raw materials and solvents. It can be used to produce phthalic anhydride, dyes, pesticides and drugs, such as vitamins. It can also be used as aviation gasoline additives.
(4)  Used as chromatographic standards and solvents
(5)  As raw materials of synthesis of anhydride and other organic synthesis;
Production methodIndustry applied super-distillation method to separate out the o-xylene from the mixed xylene. O-xylene has a over 5 ℃ difference in the boiling point compared with other components in the mixed xylene. For the distillation, the required tray number is about 150; the reflux ratio being 5-8 and consume relative much energy.
O-xylene was originally produced mainly from coal tar. Currently most of the domestic and foreign production of o-xylene is mainly via extraction from oil catalytic reforming and thermal cracking of aromatic hydrocarbon. Owing to that the structures of o-xylene, p-xylene, and m-xylene in the xylene are very similar; their physical parameters are also quite similar. Industrial o-xylene separation mainly adopts super-distillation method; first separate out the o-xylene and ethylbenzene from the mixed xylene which demands the using of 100~150 tray distillation tower; followed by separation of o-xylene and ethylbenzene to obtain pure o-xylene.
CategoryFlammable liquids
Toxicity gradingpoisoning
Acute toxicityOral-rat LDL0: 5000 mg/kg; abdominal injection-mouse LD50: 1364 mg/kg
EXPLOSIVES and HAZARDOUS CHARACTERISTICSbeing explosive when mixed with air
Flammability and Hazardous characteristicsbeing flammable upon flame, heat, oxidant Flammable with combustion releasing irritant smoke
Storage and transportation characteristicswarehouse: ventilated, low temperature and dry; gently load and unload; store it separately from oxidants and acids.
Fire extinguishing agentmist water, foam, sand, carbon dioxide, 1211 extinguishing agent
Occupational StandardTLV-TWA 100 PPM (440 mg/m 3); STEL 150; PPM (655 mg/m 3)
Chemical Propertiescolourless liquid
DefinitionChEBI: A xylene substituted by methyl groups at positions 1 and 3.
General DescriptionA colorless watery liquid with a sweet odor. Less dense than water. Insoluble in water. Irritating vapor.
Air & Water ReactionsHighly flammable. Insoluble in water.
Reactivity Profile1,2-Dimethylbenzene may react with oxidizing materials. .
Health HazardVapors cause headache and dizziness. Liquid irritates eyes and skin. If taken into lungs, causes severe coughing, distress, and rapidly developing pulmonary edema. If ingested, causes nausea, vomiting, cramps, headache, and coma. Can be fatal. Kidney and liver damage can occur.
Fire HazardBehavior in Fire: Vapor is heavier than air and may travel considerable distance to a source of ignition and flash back.
Fire HazardFlash Point (°F): 63 ℃; 75 ℃; Flammable Limits in Air (%): 1.1- 7.0; Fire Extinguishing Agents: Foam, dry chemical, or carbon dioxide; Fire Extinguishing Agents Not To Be Used: Water may be ineffective; Special Hazards of Combustion Products: Not pertinent; Behavior in Fire: Vapor is heavier than air and may travel considerable distance to a source of ignition and flash back; Ignition Temperature (°F): 869; Electrical Hazard: Class I, Group D; Burning Rate: 5.8 mm/min.
Chemical ReactivityReactivity with Water No reaction; Reactivity with Common Materials: No reaction; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent; Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.
Safety ProfileModerately toxic bj7 intraperitoneal route. Mldly toxic by ingestion and inhalation. An experimental teratogen. A common air contaminant. A very dangerous fire hazard when exposed to heat or flame. Explosive in the form of vapor when exposed to heat or flame. To fight fire, use foam, CO2, dry chemical. Incompatible with oxidzing materials. When heated to decomposition it emits acrid smoke and irritating fumes. Emitted from modern building materials (CENEAR 69,22,91). See also other xylene entries.
Purification Methodso-Xylene (4.4Kg) is sulfonated by stirring for 4hours with 2.5L of conc H2SO4 at 95o. After cooling, and separating the unsulfonated material, the product is diluted with 3L of water and neutralised with 40% NaOH. On cooling, sodium o-xylene sulfonate separates and is recrystallised from half its weight of water. [A further crop of crystals is obtained by concentrating the mother liquor to one-third of its volume.] The salt is dissolved in the minimum amount of cold water, then mixed with the same amount of cold water, and with the same volume of conc H2SO4 and heated to 110o. o-Xylene is regenerated and steam distils. The distillate is saturated with NaCl, the organic layer is separated, dried and redistilled. [Beilstein 5 H 362, 5 I 179, 5 II 281, 5 III 807, 5 IV 917.]
Tag:o-Xylene(95-47-6) Related Product Information
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