**Pressure Centrifuge**
The pressure centrifuge features a drum diameter of 1200 mm, operating at 2000 revolutions per minute with a processing capacity of 50 tons per hour. Its core technologies include high-power and high-precision planetary differential systems, stainless steel drum casting techniques, and advanced manufacturing methods for large-diameter double-end mechanical seals.
In China, several specialized manufacturers produce such equipment. Chongqing Jiangbei Machinery Factory and Jilin Chemical Machinery Factory are among the leading companies, each equipped with their own design software and a wide range of centrifuge models. Jilin Chemical Machinery Factory has developed multiple series, including horizontal spiral discharge centrifuges (500, 630, 850 series) and scraper discharge centrifuges (1200, 1600, 1800 series), widely used in petroleum, chemical, and pesticide industries. Chongqing Jiangbei Machinery Factory also offers a variety of models, such as the GKH series siphon filter centrifuges and the LW1200×1980N horizontal spiral unloading centrifuge, which is one of the largest PTA centrifuges in China. However, none of these companies have yet mastered the production of large-diameter, high-speed vertical centrifuges with decentralized differential systems, indicating a need for targeted R&D efforts.
Other key equipment in PTA plants includes crystallizers, heat exchangers, condensers, filters, and hydrogenation reactors. These are typically constructed from materials like low-carbon stainless steel, composite titanium, duplex stainless steel, and chromium-molybdenum steel. Domestic manufacturers such as Nanhua Machinery Factory, Jinzhou Heavy Machinery Factory, Jinxi Chemical Plant, and Fushun Machinery Factory have extensive experience in producing these components, making localization feasible.
For hydrogenation processes, diaphragm compressors must be completely leak-proof. Shanghai Dalong Machinery Plant has significant expertise in this area and can meet PTA requirements. Regarding centrifugal pumps, most PTA pump parameters are manageable, with only a few specialized types—such as PVDC material, Hastelloy-lined, and Duplex stainless steel pumps—currently not produced domestically. However, companies like Dalian Sulzer Pumps and Compressor Company offer comprehensive solutions that cover most PTA pump needs.
In summary, due to long-term domestic understanding of PTA equipment and the technological progress made by Chinese machinery manufacturers, it is now feasible to develop major equipment for a million-ton PTA plant. Reliance on imported equipment should be reduced, and confidence in achieving full localization through joint efforts among researchers, designers, manufacturers, and users is essential. Despite this progress, the challenges of producing large-scale PTA equipment remain significant, and no such system has been fully developed in China yet. This requires coordinated technical efforts, meticulous planning, precise engineering, and strict quality control to ensure success.
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