Preparing method for coal tar refined pitch
A technology for refining pitch and coal tar, which is used in processing tar pitch/petroleum pitch/natural pitch by distillation, processing tar pitch/petroleum pitch/natural pitch by chemical method, and processing tar pitch/petroleum pitch/natural pitch by selective extraction, etc. It can solve the problems that the sedimentation effect is not easy to control, the QI content is low, and the energy consumption is high, and the production operation is easy, the molecular weight distribution is narrow, and the operating cost is low.
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Embodiment 1
[0012] The raw material used in the method for preparing refined coal tar pitch is coal tar medium temperature pitch, and its properties are shown in Table 1.
[0013] Table 1 Properties of coal tar medium temperature pitch
[0014] raw material
SP / ℃
CV / %
QI / %
TI / %
β / ％
Medium temperature asphalt
73.50
48.75
4.11
12.77
8.66
[0015] Taking the method of small-scale preparation of coal tar refined pitch in the laboratory as an example, the specific steps are as follows:
[0016] a. Using the above-mentioned coal tar medium-temperature pitch as raw material, put the medium-temperature pitch into a stainless steel polycondensation reactor, and carry out a mild thermal polycondensation reaction under nitrogen protection. The reaction temperature is 420°C, the reaction time is 3 hours, and the nitrogen flow rate is 0.16m 3 / h, after the mild thermal polycondensation reaction, cooled to room temperature to ob...
Embodiment 2
[0022] a. Using the coal tar medium-temperature asphalt in Example 1 as raw material, put the medium-temperature asphalt into a stainless steel polycondensation reactor, and carry out a mild thermal polycondensation reaction under nitrogen protection. The reaction temperature is 420°C, the reaction time is 4 hours, and the nitrogen flow rate is 0.16m 3 / h, after the thermal polycondensation reaction is completed, cool to room temperature to obtain the polycondensation product.
[0023] b. Put 150g of polycondensation product in a 1000ml three-neck flask, add 2.5 times the proportion of medium washing oil, heat and stir at 150°C for 2 hours, filter while it is hot to remove the larger molecular carbonaceous high polymer filter residue, and obtain the refined As for the filtrate of asphalt, the obtained filtrate is distilled to remove the solvent to obtain refined asphalt, and each index of the product is as shown in Table 3.
[0024] Table 3 Properties and yield of refined asph...
Embodiment 3
[0027] a. Using the coal tar medium-temperature pitch in Example 1 as raw material, put the medium-temperature pitch into a stainless steel polycondensation reactor, and carry out mild thermal condensation reaction under nitrogen protection. The reaction temperature is 420°C, the reaction time is 5 hours, and the nitrogen flow rate 0.16 / h, after the thermal polycondensation reaction is completed, cool to room temperature to obtain the polycondensation product.
[0028] b. Put 150g polycondensation product in a 1000ml three-necked flask, add 2 times the ratio of methyl naphthalene oil, heat and stir at 150°C for 2 hours, filter while hot to remove the filter residue of larger molecular carbonaceous polymers, and obtain the refined As for the filtrate of asphalt, the obtained filtrate was distilled to remove the solvent to obtain refined asphalt, and the indicators are as shown in Table 4.
[0029] Table 4 Properties and yields of refined asphalt
[0030]
PUM
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