Siam Cement Public has filed a patent for a process to produce a multimodal polyethylene composition. The process involves polymerizing ethylene in the presence of a catalyst system and hydrogen in multiple reactors. A reactor system is also described, consisting of a first reactor, a hydrogen removal unit, a second reactor, and a third reactor. The patent aims to obtain high molecular weight polyethylene or ultra high molecular weight polyethylene. GlobalData’s report on Siam Cement Public gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Siam Cement Public, artificial concrete aggregates was a key innovation area identified from patents. Siam Cement Public's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
A recently filed patent (Publication Number: US20230192913A1) describes a reactor system and process for producing a multimodal polyethylene composition. The reactor system consists of a first reactor, a hydrogen removal unit, a second reactor, and a third reactor. The hydrogen removal unit includes a vessel connected to a depressurization equipment, such as a vacuum pump or compressor, allowing for adjustment of the operating pressure in the range of 100-200 kPa (abs). The hydrogen removal unit also contains a stripping column for the separation of hydrogen and a liquid diluent.
The process for producing the multimodal polyethylene composition involves several steps. In the first reactor, ethylene is polymerized in the presence of a catalyst system and hydrogen to obtain a low or medium molecular weight polyethylene. The hydrogen removal unit then removes 98.0 to 99.8% of the hydrogen from the slurry mixture obtained in the first reactor at a pressure of 103-145 kPa (abs), transferring the residual mixture to the second reactor. In the second reactor, ethylene and optionally a-olefin comonomer are polymerized in the presence of a catalyst system and the remaining hydrogen to obtain a first high or ultra-high molecular weight polyethylene. The resultant mixture is then transferred to the third reactor, where ethylene and optionally a-olefin comonomer are polymerized in the presence of a catalyst system and hydrogen to obtain a second high or ultra-high molecular weight polyethylene.
The multimodal polyethylene composition obtained from this process consists of three components: a low or medium molecular weight polyethylene, a first high or ultra-high molecular weight polyethylene, and a second high or ultra-high molecular weight polyethylene copolymer. The composition has a weight average molecular weight ranging from 80,000 to 5,000,000 g/mol, a number average molecular weight ranging from 5,000 to 100,000 g/mol, and a Z average molecular weight ranging from 700,000 to 10,000,000 g/mol. The density of the composition ranges from 0.930 to 0.965 g/cm3, and the melt flow index (MI5) ranges from 0.01 to 60 g/10 min.
Overall, this patent describes a reactor system and process for producing a multimodal polyethylene composition with specific molecular weight ranges and physical properties. The use of a hydrogen removal unit and multiple reactors allows for precise control over the polymerization process, resulting in a tailored composition suitable for various applications.
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