| Answer | Crossword Clue |
|---|---|
| ISOPRENE | Petroleum processing by-product |
| petrochemical | Relating to or denoting substances obtained by the refining and processing of petroleum or natural gas |
| BRAN | By-product of grain processing. |
| ASPHALT | Petroleum by-product |
| petrochemistry | The branch of chemistry concerned with petroleum and natural gas, and with their refining and processing |
| COKE | Petroleum product |
| BENZOL | Petroleum product |
| KEROSENE | Petroleum product |
| NAPHTHA | Petroleum product |
| TAR | Petroleum product |
| PARAFFIN | Petroleum product. |
| OCTANE | Petroleum product. |
| OCTANE | Product of petroleum. |
| ETHENE | Product resulting from cracking petroleum |
| residua | residual product (as from the distillation of petroleum) |
