Modified coal tar, and producing method
A production method, the technology of coal tar pitch, applied in the field of modified coal pitch, can solve the problems of no coal tar pitch, complex production method, weak selectivity, etc., achieve reduction of flue gas emissions, low cost, and wide source of raw materials Effect
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Embodiment 1
[0022] Weigh 500g of coal tar and put it into a reaction kettle. Under stirring conditions, heat up to 85°C at a heating rate of 5°C / min; add 75g of formaldehyde solution with a content of 35%, and add 25% of HCl aqueous solution to adjust the pH value of the aqueous solution to 0.1 , control the temperature of the reactor <130°C, and keep the pressure of the reaction material at 0.2Mpa for 90 minutes. After the polymerization reaction is completed and the pressure in the kettle is zero, vacuumize until the moisture content is <2%. The softening point is 10°C. The content of α component From 1.00% before the reaction to 1.01% after the reaction, the content of β component is 8.7%.
Embodiment 2
[0024] Weigh 500g of naphthalene oil and put it into a reaction kettle, and heat up to 65°C at a heating rate of 3°C / min; add 100g of 30% paraformaldehyde aqueous solution, add 30% H 3 PO 4 Aqueous solution, adjust the pH value of the aqueous solution to 1.0, control the temperature of the reactor <125°C, and keep the pressure of the reaction material at 0.2Mpa for 60 minutes. After the polymerization reaction is completed and the pressure in the kettle is zero, vacuumize until the moisture content is <2%. The temperature is 18°C, and the β component content is 9.5%.
Embodiment 3
[0026] Weigh 1000g of coal tar pitch with a softening point of 78°C and put it into the reactor, and heat up to 90°C at a heating rate of 3°C / min; add 150g of paraformaldehyde aqueous solution with a content of 30%, and add 30% H 2 SO 4 Aqueous solution, adjust the pH value of the aqueous solution to 0.2, control the reaction temperature <130°C, and keep the pressure of the reaction material at 0.25Mpa for 120min. After the polymerization reaction is completed and the pressure in the kettle is zero, add 30% NaOH aqueous solution, adjust the pH value to 7.0, and pump Vacuum to moisture<2% for testing, the softening point increased from 78°C to 134°C, the content of the α component increased from 7.25% before the reaction to 7.26% after the reaction, and the content of the β component was 30.6%.
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