A method for preparing spinnable pitch from coal tar pitch
A technology of coal pitch and pitch, which is applied in the field of spinning pitch prepared from coal pitch, can solve the problems of gas entrainment loss, wide distribution of pitch softening point, poor fluidity, etc., achieve less pitch smoke emission, obvious modification effect, and improve spinning performance effect
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Embodiment 1
[0021] The preparation method of the present embodiment petrolatum modified asphalt comprises the following steps:
[0022] Step 1: Grind medium-low temperature coal tar pitch (ash content 0.2wt%, softening point: 70°C) to below 20 mesh, mix with tetrahydrofuran at a mass ratio of 1:4, extract and filter out the soluble components of medium-temperature coal tar pitch, and recover the solvent After tetrahydrofuran, refined pitch (ash content 0.03wt%, molecular weight distribution 200-350, softening point 72) is obtained; refined coal tar pitch and petrolatum are mixed in a weight ratio of 50:1.
[0023] Step 2: Put the mixed material described in Step 1 into the reactor, blow in 20 mL / min·g of nitrogen gas at normal pressure, and heat to 180° C. at a heating rate of 5° C. / min. Stop feeding nitrogen at 180°C and continue feeding air at a rate of 40mL / min·g, heat to 310°C at a heating rate of 5°C / min, stop feeding air after staying for 4 hours and cool to room temperature. Spinn...
Embodiment 2
[0025] The preparation method of the present embodiment petrolatum modified asphalt comprises the following steps:
[0026] Step 1: Grind medium-low temperature coal tar pitch (ash content 0.15wt%, softening point: 80°C) to below 20 mesh, mix with tetrahydrofuran at a mass ratio of 1:5, extract and filter out the soluble components of medium-temperature coal tar pitch, and recover the solvent Finally, refined pitch (ash content 0.02wt%, molecular weight distribution 210-350, softening point 83) is obtained; refined coal tar pitch and petrolatum are mixed in a weight ratio of 50:1.
[0027] Step 2. Put the mixed material described in Step 1 into the reactor, blow in 20 mL / min·g nitrogen gas to purge at normal pressure, and heat to 180° C. at a heating rate of 3° C. / min. Stop feeding nitrogen at 180°C and continue feeding air at a rate of 20mL / min·g, heat to 310°C at a heating rate of 6°C / min, stop feeding air after staying for 4 hours, and cool to room temperature. Spinning pi...
Embodiment 3
[0029] The preparation method of the present embodiment petrolatum modified asphalt comprises the following steps:
[0030] Step 1. Grind medium-low temperature coal tar pitch (ash content 0.1wt%, softening point: 90°C) to below 20 mesh, mix it with tetrahydrofuran at a mass ratio of 1:9, extract and filter out the soluble components of medium-temperature coal tar pitch, and recover the solvent Finally, refined pitch (ash content 0.01wt%, molecular weight distribution 240-350, softening point 90) is obtained; refined coal tar pitch and petrolatum are mixed in a weight ratio of 10:1.
[0031] Step 2: Put the mixed material described in Step 1 into the reactor, blow in 25 mL / min·g of nitrogen gas to purge at normal pressure, and heat to 210° C. at a heating rate of 4° C. / min. Stop feeding nitrogen at 210°C and continue feeding air at a rate of 45mL / min·g, heat to 320°C at a heating rate of 5°C / min, stop feeding air after staying for 4 hours and cool to room temperature. Spinnin...
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