Recently, Tianhua Institute independently developed and designed the method of filtration, washing and separation of crude terephthalic acid in oxidation unit of purified terephthalic acid plant (patent No. ZL2010571736.6), which won the award certificate issued by Gansu Provincial Market Supervision Bureau.
The patented technology uses integrated Equipment-pressure filter instead of traditional "centrifuge filtration or vacuum filtration-steam rotary drying-air conveying-in-tank beating" technology. Compared with the original traditional technology, the patented technology makes the PTA oxidation unit process greatly shortened, the number of equipment reduced, the area of equipment reduced, the operability of the process improved, and the cost of plant construction. The PTA products are more competitive in the world because of its lower cost, easier maintenance, lower energy consumption and lower waste water discharge.
Compared with the existing technology, the patented technology can save 5.83 kW of power consumption, 112.72 kg of nitrogen and 87.28 kg of steam per ton of PTA, 18.73 kg of standard coal/t PTA, and 1.09 t/t PTA of industrial water, thereby reducing wastewater discharge. A set of 2.2 million tons per year PTA plant uses this technology, and the additional energy saving and emission reduction benefits are 69.6648 million yuan per year.
At present, the patented technology has been successfully applied in the oxidation unit of PTA plant of Hanbang Petrochemical Company and Jiaxing Petrochemical Company, and can run steadily and continuously, which proves the operability and practicability of the patented technology. In addition, the patented technology can also be applied to the treatment of isophthalic acid (PIA), coal, para-aramid (PPTA), rubber accelerator M (2-mercaptobenzothiazole), rubber vulcanization accelerator DM (dibenzothiazole disulfide) and other material slurries.
This patented technology can be called the technological revolution of PTA industry. Its popularization and application is of great significance to promote the development and innovation of PTA industry in China.