What is the batch process for producing polypropylene?

Heating the reaction vessel through its jacket – this process is too outdated. Many small plants in China used this batch-process method for producing polypropylene in the past, but now large companies no longer use this technique

A coal-to-olefins project that has just come online uses this process, with a capacity of 350,000 tons. The loop reactor method and the batch reactor method represent two different processing technologies for polypropylene. The loop reactor process utilizes one or more loop reactor reactors and one or more gas-phase fluidized bed reactors in series; homopolymerization and random copolymerization take place in the loop reactors, while the production of impact-resistant copolymers occurs in the gas-phase fluidized bed reactors. Produce homopolymer, random copolymer, and impact-resistant copolymer products with high fluidity, high MFR, and high stiffness. The kettle process uses a kettle-type reactor and is a modular process technology that enables the production of various grades of polypropylene products without the need for degreasing or removal of random components. It belongs to the bulk polymerization process and can produce a wide range of PP products including homopolymers, random copolymers, and impact-resistant types.

Is the kettle method batch production while the loop method is continuous production?

Kettles are also divided into vertical stirring kettles and horizontal stirring kettles (Innovene). In China, most units use vertical stirring kettles with a small volume; they operate in a batch mode, resulting in unstable product quality. Due to the difficulty in managing heat removal during reactions, their production capacity is generally low, less than 100,000 tons per year； Do you mean the 350,000-ton unit mentioned? Is it Zhongtian Hechuang’s 350,000-ton Innovene horizontal mixer, which uses a quasi-piston-type plug flow mechanism and has advantages in producing impact-resistant copolymer products?