Method for pretreating all fractions of coal tar and device for implementing method
A technology of coal tar and full distillate, applied in the field of coal chemical industry, can solve the problems of coal tar resource waste and refining cost, etc., achieve the effect of shortening the operation cycle, reducing operation requirements, and increasing the metal capacity
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Embodiment 1
[0028] A method for pretreatment of whole fractions of coal tar, comprising the following steps:
[0029] (1) Raw coal tar and hydrogen enter from the bottom of the fixed-bed hydrogenation reactor through the first pipeline and the second pipeline respectively, and at the same time add a protection catalyst to the fixed-bed hydrogenation reactor, the protection catalyst includes protection catalyst 1, protection catalyst 2. The protection catalyst 3 is loaded in the fixed-bed hydrogenation reactor sequentially from bottom to top;
[0030] (2) The material after the hydrogenation reaction enters the thermal high-pressure separator from the top of the fixed-bed hydrogenation reactor through the third pipeline for separation, and a part of the separated product is output from the bottom and enters the thermal low-pressure separator through the fourth pipeline, and then from the thermal The bottom of the low-pressure separator is output; the remaining part of the product is output...
Embodiment 2
[0050] The difference from Example 1 is that the reaction conditions in the step (1) are reaction pressure 6.0MPa, reaction temperature 330°C, fresh raw material space velocity 0.8h -1 , the linear velocity of liquid flow is 0.8~2.0cm / s, the bed expansion rate of protection catalyst 1, protection catalyst 2 and protection catalyst 3 is 6%~10%, and the ratio of refined coal tar to fresh raw coal tar is 3 : 1, hydrogen and raw material coal tar volume ratio 800, protection catalyst 1, protection catalyst 2, protection catalyst 3 are packed in the bottom, middle part and top of fixed-bed hydrogenation reactor respectively, the refined coal tar property that this embodiment obtains is as follows table 5.
[0051] Table 5 Properties of refined coal tar
[0052] Density at 20°C / (kg / m 3 ) 0.9999 H content / % 9.58 Metal content / μg / g Fe 0.7 Ca 0.5 Na 0.4 Distillation range, D-1160 / ℃ IBP 168 10% 229 30% 315 50% 360...
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