Alias naphtha, English name: naphtha, the main ingredients: 5 to 11 carbon atoms of alkanes, cycloalkanes or aromatics. It is a fraction of coal tar at 0 – 180 C. Its color is colorless and transparent, but it turns reddish brown in the air for a long time. Relative density is 0.78-0.97g/cm 3. Flash point is – 2 ℃, ignition temperature is 350℃, insoluble in water, soluble in most organic solvents. The content is about 0.45%-0.7% of the high temperature coal tar content.

Usage: Mainly used for extracting benzene, is the main raw material of benzene products, which is mainly used to replace crude benzene, can also be used for solvent oil, blending fuel oil.

Main ingredients: benzene, toluene, xylene. (Downstream manufacturers test triphenyl content, benzene hydrogenation industry test chlorine sulfur content, black cat triphenyl content is more than 80%, but chloride ion content is in)

National standard:

AppearanceColorless, yellowish or brown liquids
Initial boiling point≤95
Distillation volume (volume fraction) before 180℃wt%≥90
Phenol content (volume fraction)wt%≤4
Water contentVisible Insoluble Water at Room Temperature (18-25 degrees Celsius)


Blackcat Testing Standard ProjectUnitIndex valueMeasured data of products
Distillation volume (volume fraction) before 180℃wt%≥9091%
Water contentwt%≤10.2%
Initial boiling point≦9591℃

Physical properties: Crude phenols: white or colorless, easy to deliquescence and crystallization, with a significant odor and sharp burning taste, pink or even red in the air and under the action of light, industrial products due to the impurities of phenanthrene, carbazole (zuo), the toxicity increased significantly. The content of C6H6O is about 0.7% of coal tar, and the molecular formula C6H6O is soluble in ethanol, ether, chloroform and glycerol. Class C fire risk classification, explosion limit 1.3-9.5%. In black cat quality inspection index:

Indicator Name: Crude phenolUnitDetermination rangeActual measured data
Water contentwt%≤109.8%
Distillation range before 210℃wt%≥6076.6%
Distillation range before 230℃wt%≥ 8587%
Neutral oil content≤1.01.0%
Ph value5-6
Indicator Name: Crude Phenol (Secondary) Sodium Phenol Salt UnitDetermination rangeActual measured data
Free alkaliwt%≦1.50

National standard:

Index nameUnitGB3705-83
Contents of phenols and homologues (anhydrous calculation)wt%≥83
Distillation range before 210℃wt%≥60
Distillation range before 230℃wt%≥ 85
Neutral oil content≤0.8
Pyridine base content ℃≤0.5
PH value5~6
Burning Residue Contentwt%≤0.4
Water contentwt%≤10

Usage: It is used to further extract 13 kinds of products, such as coking phenol, o-cresol, m-cresol, 3*5 xylenol, phenol residue, etc. As a solvent for high-grade insulating paint, it can also directly produce phenolic resins, coatings, medical disinfectants, wood preservatives, pesticide emulsifiers, spices and explosives. It is widely used in phenolic resins, flame retardants, semiconductor sealants, insulating paint and other fields.

Deep Processing Products: Crude phenol is processed to produce phenol, m-cresol, xylenol and o-cresol.

Familiarly known as phenol-free oil, physical properties: colorless or light brown flammable liquid with pleasant fruit flavor, melting point boiling point 126 C, solidification point – 77.9 C relative density 0.8825, refractive index 1.3951 flash point 33 C and organic solvents such as alcohol, ketone, ether miscible. It is insoluble in water. Dephenolic oil accounted for 1.2%-1.95%National standard

Index nameUnitIndex
Density 20℃g/cm3≦0.99
Phenol contentwt%≤2.0
Naphthalene contentwt%≦≤4.0
Dry point≦230


Blackcat standard

Index nameUnitIndexMeasured data
Phenol contentwt%≦≤6.00.7%
Naphthalene contentwt%≦≤101.1%
Water contentWt%≤20.2%


Usage: Mainly used for high quality solvent oil, cold injection, marine oil, or deep processing.

Physical Properties: Oil is a yellow-brown to brown oily liquid, rich in quinoline, isoquinoline, indole, alpha-methylnaphthalene, beta-methylnaphthalene, biphenyl, dimethylnaphthalene, amaranth, fluorene and other valuable organic chemical raw materials, naphthalene compounds content is the highest. Boiling range 230-300 C, accounting for 4.5-10% of coal tar.National standard:

First GradeQualified products
Distillation range(大气压101.3 kPa)
Distillation volume (volume fraction) before 230℃ /%          No more than33
Distillation volume (volume fraction) before 270℃ /%          Not less than70
Distillation volume (volume fraction) before 300℃ /%          Not less than9090
Phenol content (volume fraction) /%                 No more than0.50.5
Naphthalene content (mass fraction) /%                 No more than1015
Water content (mass fraction) /%               No more than11
Viscosity E50                            No more than1.5
15℃ Crystal


Blackcat Standard ProjectUnitIndexIndexes actually measured
Distillation range before 230℃wt%≤3.00
Distillation range before 270℃wt%≥7093
Distillation range before 300℃wt%≥9096.5
Naphthalene contentwt%≤150
Water contentwt%≤1.00.2
Phenol contentwt%≤0.50.2
15℃ Crystalwt%NothingHave trace

Washing Oil Use:

There are three main types of

1 is used to wash benzene or naphthalene from coke oven gas and absorb other components at the same time.

This kind of wash oil is rich in many fine chemical raw materials or products. It can be used to separate and extract benzene, naphthalene, amaranth, fluorene, fluorene, phenol, Aza-aromatic ring (especially quinoline) and other raw materials, which has considerable deep processing value. The same washing oil can be further processed to extract the above products.

2. To make fuel oil, it needs to be mixed with dephenolized oil and used as diesel blending component.

3. Used for deep processing of washing oil, such as Baoshun Science and Technology Co., Ltd., deep processing of washing oil, producing intermediate washing oil, industrial fluorene, industrial amaranth and crude quinoline.

In addition, it is also used to prepare antiseptic oil, produce diffusive agent, water reducing agent, etc. It is also a cleaning agent for industrial equipment and mechanical equipment.

Physical properties: Molecular weight of industrial naphthalene C10H8 128.17 melt point 80.1, white or reddish, yellowish flake crystals, with special odor, volatile, sublimation, the highest allowable concentration in the air is 10 ppm. Its specific gravity is 1.162, boiling point is 217.9, flash point is 78.89, spontaneous ignition point is 526, explosion limit; lower limit of dust is 2.5g/m2 and vapor is 0.9-5.9%. It belongs to secondary inflammable solid. The content of high temperature coal tar is 8%-12%.National Standards for Industrial Naphthalene:

Index nameGB/T6699-1998
Top quality goodsQualified products
AppearanceWhite, with reddish or yellowish powdery, flaky crystals allowed
Crystallization point  ℃≥78.3≥77.5
Non volatile matter  wt%≤0.04≤0.08
Ash content   wt%≤0.01≤0.02


Quality standard of Blackcat

Technical nameUnitIndex valueIndexes actually measured
Crystallization point≥77.577.8


Uses: Mainly used in the production of naphthalene series water reducing agent, naphthalene phthalic anhydride and-naphthol.

Because of the need to produce carbon black, anthracene oil refined from tar is used for its own use, and anthracene oil is also purchased from outside for carbon black oil. Anthracene oil accounts for 25% of coal tar content. Anthracene oil is the best way to produce carbon black.


Distillation range(101.325 kPa)
Distillation volume (mass fraction) before 300℃ /%       ≤10.0
Distillation volume (mass fraction) before 360℃ /%      ≥50.0
Viscosity(E80)                         ≤2.0
Moisture (mass fraction) /%                  ≤1.5


The fraction of 280-360 degrees in coal tar fractionation is called anthracene oil. It has high viscosity and solid elution at room temperature. It is used to produce coatings, electrodes, pitch coke, carbon black, wood preservatives and pesticides. It is mainly used to extract crude anthracene, acenaphthene, fluorene, phenanthrene, carbazole and other chemical raw materials. It can be used to configure carbon black raw oil, road asphalt or fuel oil, etc. It can also be used for wood preservation and production.


Use of anthracene oil

1 Extraction of fine chemicals and chemical raw materials, anthracene, phenanthrene, carbazole, these three important chemical raw materials can not be easily and economically obtained from the petroleum industry, mainly rely on anthracene oil extraction. In addition, anthracene oil also contains amaranth, fluorene and other substances. Anthraquinone oxide can also be obtained in the process of anthracene oil processing.

2 Raw materials for coating, electrode, pitch coke, carbon black, wood preservative oil and insecticide can be used for wood preservation and preparation.

3 Hydrofining is used to produce fuel oil.

Coal tar pitch is the residue of coal tar distillation after removal of liquid fractions. About 50%~60% of the total coal tar. At room temperature, coal tar pitch is a black brittle lump with luster, odor, easy to burn when melting, and toxic.

According to the different softening point, coal tar pitch can be divided into three categories: low temperature pitch, medium temperature pitch and high temperature pitch, each of which has two grades of No. 1 and No. 2. Specific indicators are as follows.


Index nameLow temperature asphaltModerate temperature leachingHigh temperature asphalt
Number 1Number 2Number 1Number 2Number 1Number 2
Softening point/℃35~4546~7580~9075~9595~10095~120
Toluene insoluble content/%15~25≤25≥24
Ash content/%≤0.3≤0.5≤0.3
Water content/%≤5.0≤5.0≤4.0≤5.0
Quinoline insoluble/%≤10
Coking value/%≥45≥52
Note 1: Water is only used as control index in production operation, not as basis for quality assessment.
Note 2. The content of quinoline insoluble asphalt is determined at least once a month.


Use of coal tar pitch:


p> 1 is used as fuel. Because of its many solid components, it is usually mixed with heavy oil or made into slurry, which can partly replace heavy oil [2]


2 is used in the production of carbon electrode. The degree of carbon graphitization in coal tar pitch is relatively high. It can be used as electrode material, as sizing agent and binder. There are many kinds of products involved in this field, and it is the main use of coal tar pitch.


3 paint, mainly after treatment and processing, used for building and pipe waterproof coating. Epoxy coal tar pitch coating is one of the most widely used coatings.


4 Road construction and building materials are generally mixed with petroleum asphalt. Compared with coal asphalt and petroleum asphalt, there are obvious quality gaps and durability gaps. Coal tar asphalt has poor plasticity, poor temperature stability, brittle in winter, softening in summer and fast aging, while the performance of the two asphalt mixtures is better than that of their respective use alone. In addition, there are many harmful substances in coal tar pitch, many of which are very harmful to human body. It will be more environmentally friendly to use coal tar pitch after innocuous treatment.


5 needle coke, activated carbon, carbon fiber and other high value-added products. Coal tar pitch has high residual carbon value, many graphitized components and easy processing. Needle coke and carbon fibers are high-end materials with high added value. Using coal tar pitch as raw material is equivalent to turning waste into treasure.

Carbon black oil is the raw material of carbon black, which is usually blended with coal tar pitch and anthracene oil. It can also be directly processed from coal tar. The requirement for raw oil is that the content of aromatics should be high and the impurities and asphalt, moisture, ash, free carbon and sulfur should be less.

In order to ensure the quality of carbon black oil, Jining tar refining will retain 2% wash oil, and in the blending process, anthracene oil will be added into the mixture of anthracene oil and asphalt left by distillation process, making the ratio of anthracene oil to asphalt 4:6

Nearly 90% of carbon black production is by oil furnace method, and 60% and 70% of carbon black production and quality depend on carbon black oil.


and there are three kinds of carbon black raw oil:

a, petroleum system: ethylene tar, clarified oil

b, coal tar system: coal tar, anthracene oil, carbon black oil.


The advantages and disadvantages of various crude oils are as follows:

Ethylene tarGood stability, high light fraction, less impurities, good carbon black quality.Low output, low yield and high price
Clarified oilGood stability, high light fraction, less impurities, good carbon black quality, commercializationLow output, low yield and high price
Coal tarLarge output, high yield, low price and convenient purchasingPoor stability, more heavy fractions, more impurities, general quality of carbon black
Anthracene oilGood stability, concentrated fractions, less impurities, good quality of carbon black.Low oil supply and high price
Carbon black oilGood stability, large output, high yield and low priceMore heavy fractions, more impurities, carbon black of general quality