Feed method for coal tar hydrogenating unit
A feeding method and technology of a hydrogenation device, which is applied to the feed of a coal tar hydrogenation device, and in the field of coal tar hydrogenation device feed, can solve the problem of inability to change the chemical properties of coal tar scaling components, severe scaling, and economic issues
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Embodiment 1
[0048] The properties of the initial low-temperature coal tar A are shown in Table 1. The vacuum distillation method is adopted, and the fractionation tower feed heating furnace is set. The pressure at the top of the fractionation tower is ~0.05MPa (absolute pressure). The upper section is the rectification section, and the low-temperature coal tar A is separated into the coal tar light fraction (conventional boiling point lower than 150°C) discharged from the top reflux tank at an operating temperature of 40°C, and the middle section of coal tar extracted from the middle section of the tower at an operating temperature of 226°C Extract the oil (conventional boiling point is 150-360°C) and the coal tar pitch discharged from the bottom of the tower.
[0049] Coal tar light distillate and coal tar mid-section oil are mixed and hydrogenated, adopting the method of feeding separately in the present invention, coal tar light distillate is pressurized and mixed with hydrogen to form ...
Embodiment 2
[0053] The properties of the initial medium-temperature coal tar B are shown in Table 2. The vacuum distillation method is adopted, and the fractionation tower feed heating furnace is set. The pressure at the top of the fractionation tower is ~0.04MPa (absolute pressure). The upper section is the rectification section, and the medium-temperature coal tar B is separated into a light fraction of coal tar with an operating temperature of 40°C discharged from the top reflux tank (conventional boiling point is lower than 250°C), and a heavy fraction of coal tar drawn from the bottom of the tower at 220°C. Coal tar light distillate and coal tar heavy distillate are mixed and hydrogenated. Using the feeding method of the present invention, the coal tar light distillate is pressurized and mixed with hydrogen to form a light distillate-hydrogen mixture, and the light distillate-hydrogen mixture is reacted with hydrogenation The effluent is heated by heat exchange, and the heavy fraction...
Embodiment 3
[0058] The properties of the initial low-temperature coal tar A are shown in Table 1. The vacuum distillation method is adopted, and the fractionation tower feed heating furnace is set. The pressure at the top of the fractionation tower is ~0.05MPa (absolute pressure). The upper section is the rectification section, and the low-temperature coal tar A is separated into coal tar top oil (conventional boiling point lower than 150°C) discharged from the top reflux tank at an operating temperature of 40°C, and oil extracted from the middle section of the first tower (conventional boiling point is 150-150°C). 240°C), oil extracted from the middle section of the second tower (conventional boiling point is 240-360°C) and coal tar pitch discharged from the bottom of the tower. The tower top oil and the middle section extract oil are mixed and hydrogenated, adopting the separate feeding method of the present invention, the tower top oil and the first tower middle section extract oil are ...
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