Seeking advice from fellow sailors on coking issues

The black semi-solid or solid residue remaining after the distillation of coal tar can be divided into low-temperature asphalt, medium-temperature asphalt, and high-temperature asphalt. Coal tar pitch is a type of pitch produced by distilling coal tar, which is obtained through the dry distillation of coal. At room temperature, coal tar pitch is a black solid with a bulk density of 1.25–1.35 g/cm3; it becomes soft when heated to a certain temperature: (1) Low-temperature pitch (soft pitch), with a softening point of 35–75°C according to the Global method; (2) Medium-temperature pitch, with a softening point of 75–95°C according to the Global method℃ ； (3) High-temperature asphalt (hard asphalt), with a softening point according to the Global method of 95–120℃ ； Furthermore, at the request of users, coking plants can produce ultra-high-temperature asphalt with a softening point of 120–250°C. A viscous black or dark brown liquid with a pungent odor, produced during the carbonization of coal. Abbreviated as tar. Coal tar can be classified into low-temperature coal tar, medium-temperature coal tar, and high-temperature coal tar based on the carbonization temperature; the coal tar obtained in coke production belongs to high-temperature coal tar. It is one of the purification products of coke oven gas, which is condensed and separated during the cooling process of crude gas. Coal tar is a complex mixture of highly aromatic hydrocarbons; it is a black or dark brown, viscous liquid with an irritating odor that is produced during the carbonization of coal. Coal tar can be classified into low-temperature coal tar, medium-temperature coal tar, and high-temperature coal tar based on the carbonization temperature; the coal tar obtained in coke production belongs to high-temperature coal tar. It is one of the purification products of coke oven gas, which is condensed and separated during the cooling process of crude gas. Coal tar is generally used as a raw material for processing and refining to produce various chemical products (see coal tar processing). It can also be used directly, such as as a component in binders for industrial briquettes, shaped coals, and coal-based activated carbon. Additionally, it can be utilized as fuel oil, a fuel for blast furnaces, as well as a raw material for wood preservatives and carbon black production.

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