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The process for the manufacture of A-type zeolites comprises heating mixtures containing fly ash and solid NaOH at 90-180°C for 60 min, preferably at 100-150°C for 5-20 h, to obtain a slurry; mixing with more NaOH and water; and hydrothermally reacting the slurry. The mixtures may contain 5:1-1:2 (weight ratio) of fly ash and solid NaOH. The fly ash may contain 15% Al 2 O 3 ...
The process for the manufacture of A-type zeolites comprises heating mixtures containing fly ash and solid NaOH at 90-180° for more than 60 minutes, preferably at 100-150° for 5-20 h; mixing with NaOH and water; and hydrothermal reacting the slurries. The mixtures may contain 5:1 to 1:2 (wt.ratio) of fly ash and solid NaOH.
The process comprises blowing coal tar fractions with 260° or more high-b.p. into red-hot coke and dry quenching. The resulting coke is attached with carbon by thermal decomposition of coal tar and suppresses generation of undercompounded tar and soot.
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