How to distinguish between coal pitch and petroleum pitch

1. Different in natureCoal pitch is bitumen made from coal tar obtained by dry distillation of coal. Petroleum bitumen is the residue after distillation.

2. Different uses:Coal pitch is used in the manufacture of coatings, electrodes, asphalt coke, linoleum, etc., and can also be used as a raw material for fuel and asphalt carbon black. Petroleum asphalt is mainly used as road asphalt, construction asphalt, waterproof and moisture-proof asphalt, various special asphalt named after use or function, etc.

3. The differences are differentCompared with petroleum asphalt, coal asphalt has the following differences in technical properties: lower temperature stability, better adhesion to mineral aggregates, poor climate stability, and more harmful components to the human body and heavier odor.

Coal asphalt precautions.

1. During the storage period, the allowable viscosity is large. Before use, it must be fully stirred to avoid excess diluent, so as to prevent the lack of paint film and reduce adhesion and anti-rust performance.

2. If there is serious rust on the metal surface of the construction, it needs to be painted after rust removal.

3. The oil stain on the galvanized iron parts must be wiped clean with solvents before it can be brushed, otherwise the paint will lose its adhesion function, and there will be falling off or cracking.

The above content refers to Encyclopedia - Coal Pitch.

Encyclopedia - Petroleum asphalt.

1. Specific gravity (density). coal asphalt; 1 1 (c. 1 25); Petroleum bitumen 1.

2. Hammering. Coal asphalt: brittle sound and poor toughness; Petroleum asphalt: hoarse, good toughness.

3. Combustion. Coal asphalt: smoky yellow, foul-smelling; Petroleum asphalt: smoke is colorless and odorless.

4. The color of the solution. Coal pitch: the solution is dropped on the filter paper, and the spots are divided into two circles, the inner ring is black, and the outer ring is brownish-yellow; Petroleum asphalt: The spots are completely and evenly spread out and have a brown color.

Coal asphalt use.

1. Used as fuel, due to the large number of solid components, it is generally mixed with heavy oil or made into slurry, which can partially replace heavy oil.

2. For the production of carbon electrodes, the degree of carbon graphitization in coal pitch is relatively high, which can be used as an electrode material, and can also be used as a sizing and binder.

3. Coatings, mainly after treatment and processing, are used for waterproof coatings for buildings and pipes. Epoxy coal asphalt coating is one of the most widely used.

Compared with petroleum asphalt, coal asphalt has poor plasticity and atmospheric stability, and has greater temperature sensitivity, but its viscosity is larger. Coal pitch has many harmful components to the human body and has a strong odor. For this reason, coal asphalt is generally used in anti-corrosion works and underground waterproofing works, as well as in minor construction projects.

Compared with petroleum asphalt, coal asphalt has the following characteristics: poor temperature stability; Poor plasticity; poor atmospheric stability; Good corrosion resistance; Good adhesion. Coal asphalt has good anti-corrosion ability and good adhesion ability, so it can be used to prepare anti-corrosion coatings, adhesives, waterproof coatings, ointments and linoleum.

Mixing coal pitch and petroleum pitch in the right proportions results in a stable colloid, known as mixed asphalt. Mixed asphalt combines the advantages of two types of asphalt, which makes the viscosity, temperature stability and plasticity significantly improved, especially suitable for paving roads, parking lots, etc.

Petroleum pitch is more expensive.

Asphalt ** is about 3,500 yuan per ton.

Bitumen is made up of hydrocarbons of different molecular weights.

and its non-metallic derivatives composed of a black-brown complex mixture, is a kind of high-viscosity active old machine liquid, in a liquid state, the surface is black, soluble in carbon disulfide.

Asphalt is an organic cementitious material that is waterproof, moisture-proof and anti-corrosion. Asphalt can be divided into three main types: coal coke asphalt, petroleum asphalt and natural asphalt: among them, coal coke asphalt is a by-product of coking.

Petroleum bitumen is the residue after distillation. Natural bitumen is stored underground, and some form layers or accumulate on the surface of the earth's crust. Asphalt is mainly used in coatings, plastics, rubber and other industries, as well as paving roads.

Asphalt can be mainly divided into three types: coal coke asphalt, petroleum asphalt and natural asphalt

Coal coke asphalt. Coal coke bitumen is a by-product of coking, i.e. a black substance that remains in the distillation kettle after tar has been distilled. It is only physical properties with refined tar.

There is a difference, there is no clear boundary, and the general division method is to stipulate that the softening point below 26 7 (cube method) is tar, and above 26 7 is asphalt. Coal coke asphalt mainly contains anthracene, phenanthrene, pyrene, etc., which are difficult to volatilize.

These substances are toxic, and the properties of coke bitumen vary depending on the content of these components. The change of temperature has a great influence on the coal coke asphalt, which is easy to brittle in winter and easy to soften in summer. It has a special smell when heated; After heating to 260 for 5 hours, the anthracene, phenanthrene, pyrene and other components contained in it will volatilize.

Petroleum asphalt. Petroleum bitumen is the residue after distillation. Depending on the degree of refining, it is formed into a liquid, semi-solid or solid at room temperature.

Petroleum asphalt is black and shiny in color and has high temperature sensitivity. Because it has been distilled to more than 400 degrees in the production process, it contains very few volatile components, but there may still be polymer hydrocarbons that have not volatilized, and these substances are more or less harmful to human health.

Natural asphalt. Natural bitumen is stored underground, and some of the dust cracks form ore layers or accumulate on the surface of the earth's crust. Most of this asphalt has been naturally evaporated and oxidized, and generally does not contain any toxins.

Asphalt materials are divided into two categories: ground asphalt and tar asphalt. Ground asphalt is divided into natural asphalt and petroleum asphalt, natural asphalt is the residue of oil seeping out of the surface after long-term exposure and evaporation; Petroleum bitumen is a product obtained by refining and processing petroleum residue oil after appropriate process treatment. Tar bitumen is a dry distillation of organic matter such as coal and wood.

The product of the reprocessed tar obtained from the processing.

The vast majority of the asphalt used in the project is petroleum asphalt, which is a mixture of complex hydrocarbons and their non-metallic derivatives. Usually the flash point of asphalt is between 240 330, and the ignition point is about 3 6 higher than the flash point, so the construction temperature should be controlled below the flash point.

Summary. Differences in use.

The use of coal tar asphalt is that coal tar is an important raw material for the production of plastics, synthetic fibers, dyes, rubber, medicine, high-temperature resistant materials, etc., which can be used to synthesize pesticides, saccharin, dyes, pharmaceuticals and other industrial products.

The main use of petroleum asphalt is as infrastructure materials, raw materials and fuels, such as transportation (roads, railways, aviation, etc.), construction, agriculture, water conservancy engineering, industry (mining, manufacturing), civil and other departments.

Natural asphalt is mainly used for high-grade highway asphalt modification or blending asphalt, drilling aids or preparation of high softening point special asphalt. Natural asphalt as a green, low-carbon, environmentally friendly new material will be popularized and used in road construction at all levels.

What is the difference between coal coke asphalt, petroleum asphalt and natural asphalt in terms of use?

The difference in use of coal tar asphalt is that coal tar is an important raw material for the production of plastics, synthetic fibers, dyes, rubber, medicine, high-temperature resistant materials, etc., and can be used to synthesize pesticides, saccharin, dyes, pharmaceuticals and other industrial products. The main use of petroleum asphalt is as infrastructure materials, raw materials and fuels, such as transportation (roads, railways, aviation, etc.), construction, agriculture, water conservancy engineering, industry (mining, manufacturing), civil and other departments. Natural asphalt is mainly used for high-grade highway asphalt modification or blending asphalt, drilling aids or preparation of high softening point special asphalt.

Natural asphalt as a green, low-carbon, environmentally friendly new material will be popularized and used in road construction at all levels.

The difference in meaning is that coal tar bitumen is one of the main products of coal tar processing. It is the residue of coal tar distillation after extracting the fraction. Petroleum asphalt is a product of the first processing process, which is a viscous liquid, semi-solid or solid at room temperature, mainly containing hydrocarbons and non-hydrocarbon derivatives soluble in trichloroethylene, and its properties and composition vary with different production methods.

Natural asphalt is formed by petroleum in nature for a long time by the earth's crust and contact with air and water gradually change, in a natural form of petroleum asphalt, which is often mixed with a certain proportion of minerals. According to the formed environment, it can be divided into rock asphalt, lake asphalt, submarine asphalt, etc.

The difference in classification is that coal coke asphalt is divided into low-temperature asphalt, medium-temperature asphalt and high-temperature asphalt according to the different softening points. Petroleum asphalt is divided into straight-run asphalt, solvent deoiled asphalt, oxidized asphalt, blended asphalt, emulsified asphalt, modified asphalt, etc. according to the production method; According to the appearance form, it is divided into liquid asphalt, solid asphalt, diluent, emulsion, modified body, etc.; According to the use, it is divided into road asphalt, construction asphalt, waterproof and moisture-proof asphalt, and various special asphalt named after use or function. Natural asphalt can be divided into rock asphalt, lake asphalt, seabed asphalt, etc. according to the environment formed.

Rock bitumen is often produced in rock cracks or mixed with soil. Rock asphalt is a natural asphalt formed by the continuous evaporation and solidification of oil from the earth's crust and in mountains and rock cracks for a long time. Lake asphalt is a natural accumulation of ground asphalt, mixed with clay and water to form an emulsion, mostly in the form of a lake.

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Summary. In the process of coal tar processing, the residue after the distillation to remove the liquid fraction is called coal pitch, coal pitch is the main component of coal tar, accounting for about 50% 60% of the total, it is generally believed that its main components are polycyclic and fused aromatic hydrocarbons and their derivatives, the composition of specific compounds is very complex, and the difference of raw coal type and processing technology will also lead to the difference of composition, and the current method is mainly distinguished according to the softening temperature it exhibits.

No, you cannot. Coal pitch, a type of man-made asphalt, is generally a viscous liquid, semi-solid or solid. A few volts of early color black and shiny.

The coal asphalt potato tar distillation hall is processing the residue after removing the liquid fraction, accounting for about 50% 60% of the total coal tar, which is a bulk product, and the current national standard is GB T 2290-2012

In the process of coal tar processing, the residue after distillation to remove the liquid fraction is called coal pitch, coal pitch is the main component of coal tar, accounting for about 50% 60% of the total, it is generally believed that the main components of its service are polycyclic and fused cyclic aromatic hydrocarbons and their derivatives, the composition of specific compounds is very complex, and the raw coal resistance such as coal types and processing technology of different Changqi will also lead to the difference of composition, the current method is mainly based on the softening temperature it shows to distinguish.

Generally, at room temperature, the tung bitumen is a black brittle comic lump, shiny; Foul-smelling, flammable when melted, and toxic. Coal pitch has low temperature stability, good adhesion to mineral aggregates, poor climate stability (large changes in cold and heat), and contains more harmful components to the human body, especially carcinogenic polycyclic aromatic hydrocarbons such as benzopyrene, which is one of the main pollutants in the environment.

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