摘要:
在分别使用有机高沸点分散剂联苯和联三苯的条件下，以苯甲酸锌为催化剂，进行了煤氧化产物煤酸(水溶酸WSA)钾浆态床异构化制对苯二甲酸(TPA)的研究。主要考察了反应温度、催化剂用量、分散剂用量、二氧化碳初压和反应时间对TPA产率的影响。结果表明,在催化剂存在下煤酸可以转化成TPA。单独煤酸钾异构化时,以联苯为分散剂时较佳反应条件为温度420℃、压力3MPa、催化剂苯甲酸锌用量3%、分散剂用量60%、反应时间1h、TPA收率24.1%。以联三苯为分散剂时较佳反应条件为温度380℃、压力1MPa、催化剂苯甲酸锌用量3%、分散剂用量60%、TPA收率25.2%。煤酸钾与苯甲酸(BA)钾混合异构化时，以联苯为分散剂TPA产率可达60%,以联三苯为分散剂TPA产率可达62%。采用气相色谱对反应产物进行了定性和定量分析。
关键词:
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煤酸 /
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对苯二甲酸 /
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异构化 /
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分散剂 /
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浆态床
Abstract:
Terephthalic acid (TPA) can be obtained in the presence of Zn(Bzo)2 by isomerization of potassium salt of coal acid (water soluble acids, WSA) with organic dispersant having high boiling point in slurry reactor. The effects of initial CO2 pressure, amount of catalyst, reaction time, reaction temperature and the amount of dispersant on the yield of TPA were examined. The optimum conditions of isomerization, with TPA yield of 24.1%, using biphenyl as the dispersant were: temperature 420℃, initial CO2 pressure 3MPa, addition of Zn(Bzo)2 3%, dispersant 60% and reaction time 1h. The optimum conditions, with TPA yield of 25.2%, using pterphenyl as the dispersant were: temperature 380℃, initial CO2 pressure 1MPa, addition of Zn(Bzo)2 3%, and dispersant 60%. The yield of TPA by isomerization of mixture of potassium salts of coal acid and benzoic acid were 60% (use biphenyl as the dispersant) and 62% (use pterphenyl as the dispersant), respectively. The products were analyzed by gas chromatography.
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