The destructive distillation of bituminous coal, done in the absence of air in order to obtain cokeand other fractions having a greater percentage of carbon than the original material.

• 碳化作用烟煤的分解蒸馏,在没有空气的条件下进行,为得到比最初的原料所含碳的百分比大得多的焦煤以及其它馏分。