A screening LCA on the recycling chlorinated pilgering oil
Abstract: In the metalworking industry lubricants are used for production. For production of seamless stainless steel pipes Sandvik Materials Technology uses chlorinated pilgering oil, a lubricant produced from paraffin and chlorine. Today these lubricants are disposed by incineration when the lubricant is too contaminated so production drops, and the lubricant is replaced by new lubricant. RecondOil found a solution to clean these oils instead of disposing them. To assess the environmental impact for the process of cleaning a screening Life Cycle Assessment (LCA) was conducted. The functional unit used is the amount of chlorinated pilgering oil used per year, and impact categories were chosen to be Global Warming Potential (GWP) and Acidification Potential (AP). The study was conducted for the impact from cradle to grave. The outcome of the LCA showed that the main impact for GWP comes from the disposal phase for the conventional process, which is incineration. For the cleaning and reusing process major impacts where found to be from the transportation of raw materials, half-fabricates, products and waste. It was found that only transportation had a major impact on AP. The results show that for both GWP and AP the recycling process has lower potential emissions than the conventional method, but further research on for example electricity and chlorine production is needed to compose a better comparison of the two processes from a life cycle perspective.
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