Questions about polyethylene catalysts
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I would like to ask: what is the actual catalytic capacity of current polyethylene slurry catalysts, in terms of tons per kilogram (for those that are already in use in production)? What is the optimal ratio between silica gel and furan? How much more room is there for improving the catalytic efficiency of Th-1 solid catalysts? Thank you!
By slurry catalyst, do you mean the catalyst used in the slurry process for low-pressure polyethylene, or the slurry catalyst used in the gas-phase process? I know a bit about the latter; its value is around 22,000. It seems that the ratio of silica gel to THF isn’t very important; rather, it’s the ratios of THF to diethylaluminum chloride and THF to trin-hexylaluminum that are significant. http://www.leadercata.cn/big5/cpjs.htm This is a manufacturer of domestic catalysts; there are many companies in China that produce Ziegler-Natta catalysts. I’m not very familiar with their specific properties. Below is a performance table for the SLC series of catalysts:
Catalyst Name | Catalyst Activity (gPE/gcat) | Appearance | Application
--- | --- | --- | ---
SCG-1(Ⅰ) | 4000–6000 | Light gray powder | Operation in non-condensing conditions; used for producing LLDPE, MDPE, and HDPE with MI2.16≥8
SCG-1(Ⅱ) | 6000–8000 | Light gray powder | Operation in condensing conditions; used for producing LLDPE, MDPE, and HDPE with MI2.16≥8
SCG-1(Ⅲ) | 4000–7000 | Light gray powder | A specialized catalyst for producing all types of HDPE
SCG-3 | 6000–11000 | Light yellow powder | Used for producing HDPE with MFR=50–90
SCG-4 | 6000–11000 | Yellow-green powder | Used for producing LLDPE and MDPE with MFR=50–90
SCG-5 | 3000–6000 | Gray-green powder | Used for producing HDPE with MFR=75–150
SCG-6 | —— | White powder | Can be used by switching between different catalyst grades
SLC-G | 8000–12000 | Light gray powder | Used for producing LLDPE, MDPE, and HDPE
SLC-S | 15000–30000 | Gray-green liquid | A slurry catalyst used for producing LLDPE, MDPE, and HDPE
SLC-i | 6000–10000 | Light gray powder | Suitable for BP Company’s INNOVENE process for producing gas-phase polyethylene LLDPE/HDPE. SLC-B 13000-18000 light purple powder, suitable for BORSTAR process bimodal polyethylene plants of BOREALIS Company. * Where not specified, it refers to UNIPOL polyethylene process plants
Catalyst Name | Catalyst Activity (gPE/gcat) | Appearance | Application
--- | --- | --- | ---
SCG-1(Ⅰ) | 4000–6000 | Light gray powder | Operation in non-condensing conditions; used for producing LLDPE, MDPE, and HDPE with MI2.16≥8
SCG-1(Ⅱ) | 6000–8000 | Light gray powder | Operation in condensing conditions; used for producing LLDPE, MDPE, and HDPE with MI2.16≥8
SCG-1(Ⅲ) | 4000–7000 | Light gray powder | A specialized catalyst for producing all types of HDPE
SCG-3 | 6000–11000 | Light yellow powder | Used for producing HDPE with MFR=50–90
SCG-4 | 6000–11000 | Yellow-green powder | Used for producing LLDPE and MDPE with MFR=50–90
SCG-5 | 3000–6000 | Gray-green powder | Used for producing HDPE with MFR=75–150
SCG-6 | —— | White powder | Can be used by switching between different catalyst grades
SLC-G | 8000–12000 | Light gray powder | Used for producing LLDPE, MDPE, and HDPE
SLC-S | 15000–30000 | Gray-green liquid | A slurry catalyst used for producing LLDPE, MDPE, and HDPE
SLC-i | 6000–10000 | Light gray powder | Suitable for BP Company’s INNOVENE process for producing gas-phase polyethylene LLDPE/HDPE. SLC-B 13000-18000 light purple powder, suitable for BORSTAR process bimodal polyethylene plants of BOREALIS Company. * Where not specified, it refers to UNIPOL polyethylene process plants
It is related to THF; the ratio and formula are kept confidential. The online reduction ratio also plays a role