High temperature coal tar
Product Production Preparation Method
High-temperature coal tar is a byproduct obtained from high-temperature dry distillation of coal. It is a black oily liquid with a special odor. The main components are aromatic hydrocarbons and organic compounds containing oxygen, nitrogen, or sulfur. After preliminary distillation, fractions such as light oil, phenol oil, naphthalene oil, wash oil, and anthracene oil can be obtained by continuous distillation method; Fractions such as light oil, medium oil, heavy oil, and anthracene oil can be obtained using intermittent distillation method; The distillation residue is asphalt. Further processing and refining of the above fractions can yield benzenes, phenols, naphthalene, anthracene, phenanthrene, carbazole, pyridine bases, etc. These products are important raw materials for industries such as dyes, pharmaceuticals, explosives, plastics, synthetic fibers, or spices.
Introduction to the Shape of Coal Tar
Coal tar at room temperature is a black viscous liquid, and the density of high-temperature coal tar produced by coking is relatively high, ranging from 1.160 to 1.220g/cm3. Mainly composed of polycyclic aromatic compounds, with less content of alkyl aromatics, more high boiling point components, and good thermal stability. Its components have a higher content of naphthalene, while the relative content is relatively low, mainly including 1-methylnaphthalene, 2-methylnaphthalene, acenaphthene, fluorene, oxyfluorene, anthracene, phenanthrene, carbazole, anthracene, quinoline, pyrene, etc.
The Processing Technology of the Product
The properties of each component of tar are different, but there are many components with similar properties. It is necessary to first use distillation methods to cut various fractions, such as phenol, naphthalene, anthracene, etc
The extracted single-component products are concentrated in the corresponding fractions and further separated using physical and chemical methods.
The fraction before 170 ℃ is light oil; The fraction at 170-210 ℃ is mainly phenolic oil; The main fraction at 210~230 ℃ is naphthalene oil; The distillate at 230-300 ℃ is mainly wash oil; The fraction at 280-360 ℃ is mainly anthracene oil; The fraction at 280-360 ℃ is anthracene oil; The initial boiling point of anthracene oil fraction is 310 ℃, and it is 400 ℃ when distilling 50%
Product Purpose
Coal tar is one of the important products in the coking industry, accounting for about 3% to 4% of the installed coal. Its composition is extremely complex, and in most cases, it is composed of coal
The tar industry specializes in separation, purification, and utilization. The various fractions of tar can be further processed to separate various products. Currently, the main extracted products include:
(1) Naphthalene is used to produce phthalic anhydride for the production of resins, engineering plastics, and dyes. Used for paint and medicine.
(2) Phenols and their homologs are used to produce synthetic fibers, engineering plastics, pesticides, pharmaceuticals, fuel intermediates, * *, etc.
(3) Anthraquinone fuel, synthetic kneading agent, and paint produced from anthracene.
(4) Phenanthrene is an isomer of anthracene, second only to naphthalene in content, and has many uses. Due to its high yield, it still needs further development and utilization.
(5) Carbazole is an important raw material for dyes, plastics, and pesticides.
(6) Asphalt is a residue of tar distillation, a mixture of various polycyclic polymer compounds. Used for making roof coatings, moisture-proof layers, road construction, and production
Asphalt coke and electric furnace electrodes, etc.
