【作者】 齐彦伟；

【导师】 辛峰；

【作者基本信息】 天津大学 ， 化学工程， 2007， 硕士

【摘要】 对苯二甲酸(TA)残渣是PTA装置在生产对苯二甲酸过程中排放出的一种含有少量醋酸钴、醋酸锰等催化剂的有机副产物,主要成份为苯甲酸,对甲基苯甲酸,间苯二甲酸,对苯二甲酸和其他杂质等,同时含有余量的水分。由于成份复杂,难于处理,长期以来一直由购买PTA残渣的客户与PTA残渣一起运离厂区,由其自行处理,主要手段就是掩埋,对掩埋地造成一定的环境污染,致使PTA残渣不能按原设计返回氧化单元,而PTA残渣以极低的价格销售,远远与其品质不相适应,对PTA装置的效益产生了一定的影响。本研究通过对文献报道的各种TA残渣的综合利用及处理方法进行分析,对由TA残渣合成混合型增塑剂的过程进行了研究。研究表明,TA残渣与丁醇酯化,具有原料成本低,产物处理容易,可以生产高沸点溶剂、丁酯型增塑剂、二甘醇二苯甲酸酯增塑剂,残液可以用作低档增塑剂或加热炉燃料等特点,具有一定的实用价值和经济效益。通过研究,提出了一种比较完善的TA残渣综合利用的工艺方案,并对其中的部分处理单元进行了放大试验,取得了较好的结果和小批量的试用产品。该工艺的开发成功使生产企业有望解决一直存在的困扰PTA装置的TA残渣的出路问题,从而使得PTA残渣可以按原设计返回氧化单元,由此,PTA装置可多产PTA产品1400吨/年以上,经济效益明显,同时也解决了TA残渣掩埋导致的环境污染。更多还原

【Abstract】 Terephthalic acid(TA) residue is a byproduct composed of inorginatic and organic impurities from the unit of PX oxidation to synthesize terephthalic acid, and the main components of TA residue are benzoic acid, p-methyl benzoic acid, m-phthalic acid, terephthalic acid and other impurities. Because of the complexity in components of TA residue, it is difficult to treat, and combustion and burying are two general methods, but which leads to environmental pollution. For us, TA residue has been the tie-in product with PTA residue for a long time, so PTA residue can not be returned to PX oxidation unit, and be only sold at a lower price than its own value, therefore, the economic benefit of PTA uint is decreased.This paper has analysed the synthetical utilization of TA residue, which were reported in some articles, and studied on the process of synthesizing mixed plasticizer with TA residue. The results show that the esterify reaction between TA residue and butanol has practicability and economic benefit. The esterify reaction also has several merits, such as low material cost, being apt to deal with product, producing high-boiling point solvent, butylether plasticizer, diglycol benzoic ether plasticizer,and the remnant solvent acted as low-end plasticizer or fuel of heater.After the studies, a valuable synthsis process was exploited to utilize TA residue, and the pilot experiment of some units were studied, a better research achievement was obtained in batch production. This technique will enable corporation to solve the problem of TA residue, which worries PTA unit for a long time, and enable PTA to return to PX oxidation unit. So PTA unit can increase productivity more than 1400 t/a, and biggish benefit will be got also. At mean time, the environmental pollution, brought by burying TA residue, will be avoided.更多还原