Purity of polymeric-grade 1-butene
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I would like to ask: what is the typical purity requirement for polymeric grade 1-butene in industrial production? How are the impurity components and their contents specifically restricted? Are there any friends familiar with LLDPE or full-density polyethylene plants who could provide some insight?
1 Butene – 1% by weight, 99.0 (minimum). 2 Other C4 components – % by volume, 1.0 (maximum). 3 Methylene dichloride and 1,3-butadiene – ppm by volume, 200 (maximum). 4 Methylacetylene – ppm by volume, 5 (maximum). 5 Oxygen – ppm by volume, 10 (maximum). 6 Sulfur – % by weight, 1 (maximum). 7 Carbon dioxide – ppm by volume, 5 (maximum). 8 Carbon monoxide – ppm by volume, 0.2 (maximum). 9 Water – % by weight, 5 (maximum). 10 MTBE – ppm by volume, 10 (maximum). The butene coming from the BG complex mainly contains butadiene in amounts that can exceed the specified limits
Excerpted from the polyethylene feasibility study report: Specifications for polymeric grade butene-1 Sequence Number Parameter Name Value 1 Butene-1 99% vol.min 2 Isobutylene + Butadiene + n-Butane + Isobutane 1% vol.max 3 Methylene 200 ppm vol.max 4 Propyne 10 ppm vol.max 5 Carbon monoxide 5 ppm vol.max 6 Carbon dioxide 10 ppm vol.max 7 Total carbonyls (MEK) 5 ppm vol.max 8 Oxygen 1 ppm vol.max 9 Sulfur 1 ppm wt.max 10 Chlorides 1 ppm wt.max 11 Water 20 ppm vol.max 12 Methanol 1 ppm vol.max 13 Ethylene 500 ppm vol.max 14 Ethane 600 ppm vol.max