| 21. | "I'm not so sure about the refining process ."
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| 22. | The chemical _ a suspected carcinogen _ is a byproduct of the petroleum refining process.
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| 23. | Pattinson patented his silver refining process in 1833.
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| 24. | The filter presses used in the refining process consisted of mats of woven wire and canvas.
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| 25. | Uranium was a by-product of the refining process, and the company had little use for it.
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| 26. | The copper refining process requires large quantities of sulfuric acid, which is produced on-site at Potrerillos.
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| 27. | This ratio depends upon the type of bauxite used in the refining process and extraction conditions.
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| 28. | "MTBE is blended into the gasoline at the end of the refining process, " she said.
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| 29. | Around 2 per cent of LP gas is obtained as by-product in the petroleum refining process.
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| 30. | And although this can be a refined process much has been learned from studies of simple behaviors.
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