煤沥青（CTP）具有丰富的芳环结构，适宜通过氧化解聚来制备高值苯多酸（BCAs）化合物。然而在碱-O2氧化CTP制备BCAs过程中，存在部分组分黏结在反应釜的内壁和底部从而影响CTP氧化效果的问题。对此，采用CH3OH萃取和空气氧化对CTP进行了预处理，探究了预处理方法对碱-O2氧化CTP制备BCAs的影响。CTP经CH3OH萃取后，可以去除部分轻质组分，降低CTP在反应釜中的附着情况；随后CTP甲醇萃余渣再经空气氧化处理后，可引入含氧官能团，增加了萃余渣与碱液接触几率，有助于提高氧化效果。经两级预处理后CTP氧化所得水溶性酸中，BCAs的选择性可达80%，且BCAs中苯五甲酸和苯六甲酸含量可高达24%以上。

Coal tar pitch (CTP) is abundant in aromatic ring structures, which would facilitate preparing high added value benzene polycarboxylic acids (BCAs) by oxygen-depolymerization of CTP. However, during the preparation of BCAs by alkal-O2 oxidation of CTP, part of CTP is bonded to the inner wall and bottom of the reactor, which hinders CTP further oxidation. Extraction with CH3OH and air oxidation were used in CTP pretreatment, and the influence of pretreatment methods was explored on the preparation of BCAs by alkali-O2 oxidation of CTP. Some light components of CTP could be removed after extraction, reducing adhesion between CTP and the reactor. Then, the extraction residue of CTP with CH3OH was further pre-oxidized by air, which introduced the oxygen-containing functional groups, thus increasing the collision between extraction residue and aqueous alkali. In the resulting water soluble acids from oxidation of the pre-treated CTP, the selectivity of BCAs can reach 80%. Furthermore, the relative content of benzenepentacarboxylic acid and mellitic acid in BCAs could increase up to 24%.

0 引言

1 试验

   1.1 主要原料

   1.2 试验方法

   1.3 分析方法

2 结果与讨论

   2.1 JCTP、JER和JEPR的结构特性

   2.2 JCTP、JER和JEPR的碱-O2氧化

   2.3 BCAs的分布

3 结论