Normally the by-product. benzene residue. in benzene refining in coking plant is put into tar or sold and so the benzene product in the residue cant be recovered.
焦化厂苯精制的副产品-苯残渣，一般采用配入焦油中或外卖的处理方法．其中的苯类产品得不到有效回收。
2
A final reference I have found is in DG Edwards' Historical Gazetteer and Bibliography of By-ProductCoking Plants in the UK.
最后一个参考，我发现在总干事爱德华兹的历史地名和按书目，焦化厂的产品在英国。
3
The by-product gas of producing of traditional coking technique belongs to the gas of easy burning.