| Share | Phrase |
|---|
| 20.88% | by-product [does] liberate |
| 10.47% | combustion by-product |
| 7.85% | harmless [producing effect] by-product |
| 5.29% | reaction by-product |
| 5.04% | undesirable [evaluation] by-product |
| 4.78% | oily [consistence] by-product |
| 4.44% | process by-product |
| 4.43% | by-product [is] gas |
| 3.87% | unwanted [effectiveness] by-product |
| 3.48% | remove by-product [perform operation] |
| 3.23% | noxious [producing effect] by-product |
| 2.95% | exhaust by-product [perform operation] |
| 2.73% | by-product [does] contribute |
| 2.44% | solid [state] by-product |
| 2.41% | combustible by-product |
| 2.14% | exhaust [physical/chemical] by-product |
| 2.09% | by-product production |
| 2.07% | produce by-product [perform operation] |
| 2.06% | gaseous [state] by-product |
| 1.82% | by-product removal |
| 1.48% | exhaust [physical/chemical] by-product |
| 1.26% | reduce by-product [perform operation] |
| 0.95% | contain by-product [perform operation] |
| 0.94% | gas by-product |
| 0.77% | by-product [does] form |