Method for purifying soft asphalt
A technology of soft asphalt and mixed solvent, which is applied in the direction of processing tar asphalt/petroleum asphalt/natural asphalt by distillation, and processing tar asphalt/petroleum asphalt/natural asphalt by selective extraction, which can solve the problems of reducing sodium ion content and achieve reduction The effect of high production cost, high efficiency and high yield
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Embodiment 1
[0029] 1), Raw material coal tar soft asphalt: softening point is 39.0°C, QI content is 1.98%, Na + The content is 318mg / kg;
[0030] 2), mixed solvent is mixed by kerosene and washing oil, kerosene: washing oil=1: 0.90 (w / w), the initial boiling point of mixed solvent is 160 ℃, and the distillate amount before 310 ℃ is 97% (w / w) w);
[0031] 3) Mix the soft asphalt with a temperature of about 120°C and the mixed solvent of about 70°C in a ratio of 1:0.90 (w / w) by metering pumps to the pipeline mixer respectively, and control the temperature of the material after the mixer to 95°C , a flow rate of 400l / h, then enter a horizontal centrifuge, and separate at a speed of 3000G and 4200rpm to obtain centrate and residue;
[0032] 4), after distilling the centrifuge obtained above at -60kPa (vacuum degree) and 285°C, the softening point was 37.0°C, the QI content was 0.07%, Na + The content is 13.4mg / kg purified soft asphalt, and the yield is 87%; The recovery solvent yield is 95...
Embodiment 2
[0034] 1), raw material coal tar soft pitch: softening point is 37.0°C, QI content is 2.10%, Na+ content is 305mg / kg;
[0035] 2), the mixed solvent is formed by mixing kerosene, washing oil and light oil, kerosene: washing oil: light oil = 1: 0.5: 0.4 (w / w / w), the initial boiling point of the mixed solvent is 155 ° C, 310 ° C The previous distillation volume is 96.5% (w / w);
[0036] 3) Mix the soft asphalt with a temperature of about 120°C and the mixed solvent of about 73°C in a ratio of 1:1.0 (w / w) by metering pumps to the pipeline mixer respectively, and control the temperature of the material after the mixer to 97°C , a flow rate of 450l / h, then enter a horizontal centrifuge, and separate at a speed of 2800G and 3800rpm to obtain centrate and residue;
[0037] 4), the centrifugal liquid obtained above was distilled, and the conditions and parameters of the distillation were the same as in Example 1, and the softening point was 35.5° C., the QI content was 0.1%, and the N...
Embodiment 3
[0039]The recovered solvent in Example 1 is reused for the purification of soft asphalt. The soft asphalt used in the test and the condition parameters are the same as in Example 1. The softening point is 36.5°C, the QI is 0.08%, and the Na + The content of purified bitumen is 13.3mg / kg, the yield is 86.7%, the recovery solvent yield is 95.5%, and the centrifugal residue yield is 12.6%.
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