无烟煤氧化制苯多羧酸

FORMATION OF AROMATIC POLYCARBOXYLIC ACIDS FROM COAL BY OXYGEN-OXIDATION IN ALKALINE MEDIUM

对阳泉无烟煤进行了碱－氧气氧化研究。发现反应温度、碱的用量、反应时间以及氧初压是影响和控制水溶酸产率和反应速度的重要因素。最佳氧化条件为：温度２６０℃，碱煤比３．２８：１，反应时间２ｈ，氧初压５．５ＭＰａ。在最佳氧化条件下水溶酸的产率高达６６．０％，其中６７．４％为苯多羧酸。并采用红外光谱和气相色谱对反应产物进行了定性和定量分析。

In order to investigate the formation of aromatic acids from coals,Yangquananthracite was subjected to alkali-oxygen oxidation at 250℃ to 270℃ in an aqueous solutionof potossium hydroxide. Temperature,amount of alkali used,reaction time and initial pres-sure of oxygen were found to be important factors controlling the yields of aromatic acids andthe reaction rate.Under optimum operating condition(100g KOH(≥82%)/25g coal(daf),initial O_2 pressure 5.5MPa,reaction time 2h. and reaction temperature 260℃),the yield ofwater-soluble acid reached 66.0%(daf coal),67.4% of which being benzene carboxylicacids. The theoretic yield of pyromellitic acid is 14. 85%(daf coal).The products were ana-lyzed by gas chromatograghy and IR spectroscopy.