Regarding the slurry catalysts for full-density polyethylene in fluidized beds, how does T3/DC affect the hydrogen blending copolymerization behavior?

Titanium is the active center in polymerization reactions; it affects the catalyst feed rate, heat generation in the reactor, and catalyst yield. Magnesium chloride can enhance catalyst activity, improve sensitivity to hydrogen, promote the copolymerization of comonomers, and stabilize the catalyst to narrow the molecular weight distribution. Due to the lack of a carrier, the dry UCAT-J catalyst has poor flowability; therefore, mineral oil is used to assist in transporting the UCAT-J catalyst and feeding it into the reactor. The slurry (25–30% solids) is stored in portable and reusable steel cylinders. The UCAT-J catalyst slurry is available in two particle sizes, with 14-micron particles being used for the production of low-density resins. 25 microns is used for producing high-density resins. The particle size improved the apparent properties of the film, enhanced the color of the resin, and reduced the copolymer extraction rate of the film. The UCAT-J catalyst system reduces the slurry using a certain ratio of T3 and DC. “\"Online Reduction\" (ILRS) is what enables this process. After being thoroughly mixed in the storage and transport cylinders, the slurry is stored in a slurry feed tank, where it is continuously stirred to prevent solid deposition. The slurry is pumped to a static mixer where it is mixed with T3. The resulting slurry then passes through a temperature control system and goes to the DC retention tank, where it is mixed with DC using a second static mixer. After that, it passes through another temperature control system before reaching the DC retention tank again. At this point, the reduced protoplasm becomes an active UCAT-J catalyst, which is then injected into the reactor using nitrogen. Different ratios of T3 and DC to the raw slurry are used to produce various polyethylene resin products.