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Some of the coke oven gas processing facilities of Hansa coke plant, Dortmund, Germany. Mostly demolished.

Coke oven gas in various degrees of purity can be a product as important as coke itself. Byproduct and derivates winning has lost most of its importance, though: while in older plants like this, dozens of different byproducts were won, modern plants are targeted at winning as few of them as possible.