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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

Inactive Publication Date: 2010-01-20
何巨堂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] ① In the heat exchange process before entering the hydrogenation catalyst bed, the coal tar high-pressure heat exchanger whose coal tar operating temperature is between the metamorphic temperature (such as 200-300°C) has serious fouling on the coal tar side and needs to be cleaned regularly, resulting in unplanned shutdown;
[0007] ②In the heat exchange process before entering the hydrogenation catalyst bed, the coal tar high-pressure heat exchanger whose operating temperature is between the metamorphic temperature (such as 200-300 ℃) will greatly reduce the heat exchange effect due to serious fouling, which will affect the subsequent heat exchange. The heater works normally;
[0010] ①Do not process or less process the scale-prone fraction, but this method reduces resource utilization and is uneconomical;
[0011] ② Coal tar heat exchangers use scale inhibitors, because the scale inhibitors cannot change the chemical properties of coal tar scaling components, the effect is very poor
[0012] There is no report on the feeding method of significantly or completely improving the fouling of high-pressure heat exchangers with coal tar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a feed method for coal tar. After the pressure of a coal tar raw material is boosted by a hydrogenation reaction raw material booster pump, the coal tar raw material enters a hydrogenation reactor without any indirect heat exchange; and before the pressure of the coal tar raw material is boosted, the coal tar raw material can be hot stream from a fractionating tower. The method can avoid a high-pressure heat-exchange temperature-rise process of the coal tar, eliminate the problem of fouling of high-pressure coal tar heat exchangers, reduce the hydrogenation catalyst bed pressure drop, slow down the coking, and prolong the operation cycle.

Description

technical field [0001] The invention relates to a method for feeding a hydrocarbon hydrogenation unit that is easily deteriorated by heating; in particular, the invention relates to a method for feeding a coal tar hydrogenation unit; The feeding method of coal tar hydrogenation unit that is coked or easily scaled by heating. Background technique [0002] In the known coal tar hydrogenation device, after the raw material of coal tar at normal temperature or lower temperature is boosted by the hydrogenation reaction raw material pump, it passes through the high-pressure heat exchanger to indirect heat exchange with the hydrogenation reaction effluent to recover heat energy, and then enters the hydrogenation reaction. Reactor, and a variety of coal tar raw materials share the hydrogenation reaction raw material pump. [0003] It is well known that coal tar, especially coal tar containing heavy fractions (such as conventional boiling points higher than 250°C), and more particul...

Claims

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Application Information

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IPC IPC(8): C10C1/00
Inventor 何巨堂
Owner 何巨堂
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