Indeed that's been a huge problem to date. Here's hoping they've made actual progress: "The robust process is tolerant to contaminants in the feed. This means e

Indeed that's been a huge problem to date. Here's hoping they've made actual progress: "The robust process is tolerant to contaminants in the feed. This means easier pretreatment of the feed before the Olefy processing." (from the bullet points about halfway through the article)