摘要
阐述了PTA装置生产过程中PT酸 (对甲基苯甲酸 )的生成和分离。影响PTA产品中PT酸含量的因素有 :Pd/C催化剂的活性 ,TA中 4 CBA和PT酸的含量 ,结晶条件 ,进料浓度和离心分离效果。通过对初期加氢的弱化 ,TA单元优化控制 ,适当提高第一、二结晶器的温度、液位 ,提高PTA粒度 ,提高离心机分离效率等 ,可使一般最终产品中的w(PT酸 )在 135mg/kg左右。
The generate and separation of PT acid( p -methyl-benzoic acid) in PTA plant production process is described. The factors which have effect on PT acid content in PTA product are the activity of Pd/C catalyst,4-CBA and PT acid content in TA, crystal condition, in-feeding concentration and centrifugal separation effect. By weakening the initial hydrogenation, optimizing the control of TA unit, raising the temperature and liquid-level of the first and second crystallizers; increasing the particle size of PTA, increasing the centrifugal separation efficiency the mass fraction of PT acid in final product is 135 mg/kg.
出处
《聚酯工业》
CAS
2002年第3期30-34,共5页
Polyester Industry
