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m-Xylene

m-Xylene structure

CAS No:
108-38-3
Formula:
C8H10
Chemical Name:
m-Xylene
Synonyms:
Benzene,1,3-dimethyl-;m-Xylene;1,3-Dimethylbenzene;m-Dimethylbenzene;1,3-Xylene;m-Methyltoluene;m-xylol;NSC 61769;3-Methyltoluene
Categories:
Organic Chemistry > Hydrocarbons and Derivatives

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Description

Colorless liquid with an aromatic odor.

m-Xylene Basic Attributes

Molecular Weight：

106.17

Exact Mass：

106.17

BRN：

605441

EC Number：

203-576-3

HScode：

2902420000

Characteristics

PSA：

XLogP3：

3.20

Appearance：

Colorless Liquid

Density：

0.8684 g/cm³ @ Temp: 15 °C

Melting Point：

-47.4 °C

Boiling Point：

139.3 °C

Flash Point：

77 °F

Refractive Index：

1.500

Water Solubility：

Immiscible with waterMiscible with many organic solvents, including alcohol and ether

Storage Conditions：

0-6°C

Vapor Pressure：

16 mm Hg ( 37.7 °C)

Vapor Density：

3.7 (vs air)

Toxicity：

Oral-Rat LD50: 5000 mg/kg

Flammability characteristics：

In case of fire, high temperature, oxidant is more flammable; burning produces irritating smoke

Explosive limit：

1.1-7%(V)

Odor：

Sweet odor

Taste：

Taste threshold: 0.3 ppm

Safety Information

Packing level：

Hazard category：

Transport codes：

UN 1307 3/PG 3

wgk germany：

hazard class code：

10-20/21-38-39/23/24/25-23/24/25-11-36/38

safety instructions：

25-45-36/37-16-7

RTECS Number：

ZE2275000

Marks：

Xn,T,F

Storage features：

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

Explosive characteristics：

Explosive when mixed with air

Stability/Shelf Life：

Stable under recommended storage conditions.

Precautionary statement(s)：

P261-P273-P280-P301 + P310-P305 + P351 + P338-P331

Hazard Statements：

H226-H304-H312 + H332-H315-H319-H335-H412

Toxicity

Toxicity class：

moderately toxic

m-Xylene Use and Manufacturing

Methods of Manufacturing

The preparation method is to use petroleum xylene or coal tar xylene for separation. The separation method can be low temperature crystallization method, compound method, adsorption method and sulfonation hydrolysis method. In the past, m-xylene was produced by sulfonation hydrolysis method in China, but now m-xylene has been separated by adsorption method. The adsorption method uses molecular sieve as the adsorbent, which can perform gas phase adsorption or liquid phase adsorption. The process is described as follows. (1) Sulfonation and hydrolysis method The mixed xylene is cut by distillation to obtain a fraction of 130-140°C, and then sulfuric acid is added to sulfonate. The reaction temperature is 80-90°C and the reaction time is 3.5h. Then, the sulfonated xylene is separated and then hydrolyzed 、Distillation, cut the 140～150℃ fraction to get the finished product. This method has serious corrosion to the equipment, and there are more three wastes, which can only be produced on a small scale, so it is replaced by the adsorption method. (2) Adsorption method adopts molecular sieve for liquid phase adsorption or gas phase adsorption. Liquid phase adsorption uses K-Ba-Y type as adsorbent and toluene as desorbent. It is continuously adsorbed and separated in a moving bed. The operating temperature is 65～85℃. The ratio of agent to raw material is not greater than 10, and the ratio of desorption agent to raw material is greater than 5. Gas phase adsorption also uses K-Ba-Y molecular sieve as the adsorbent, the adsorption temperature is 170 ~ 180 ℃, and the operating pressure is normal pressure. Adsorption separation method is a new method for separating xylene in modern times.

Uses

Meta-Xylene is used for the production of isophthalic acid, of agriculture chemicals as pharmaceuticals. It finds applications in paint and varnish removers and aerosol paint concentrates. Product Data Sheet

Computed Properties

Molecular Weight:106.16
XLogP3:3.2
Exact Mass:106.078250319
Monoisotopic Mass:106.078250319
Heavy Atom Count:8
Complexity:58.4
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes

Material

p-Xylene

Toluene

4-Aminophenol

Xylene

Hydrogen

3,5-Bis(trifluoromethyl)benzene

Methanol

Benzene

Naphthalene

Downstream Products

3,5-Bis(trifluoromethyl)benzene

o-Xylene

Price Analysis

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1,3-Xylene cas no 108-38-3

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CAS No.: 108-38-3

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