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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。
There were not n-hexane, benzene, toluene and xylene, o-xylene, styrene and other organic solvent residue in the purification of apple polyphenol by the headspace gas chromatograph.
再采用顶空气相色谱法检测所得苹果多酚纯化物中正己烷、苯、甲苯、对二甲苯、邻二甲苯、苯乙烯等有机溶剂残留均低于检测限。
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