| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject adsorbent outstandingly improved in adsorption capacity for odorant in fuel gas, therefore useful in the case of city gas or the like by treating activated carbon fibers with nitric acid. SOLUTION: This adsorbent for odorant in fuel gas is such one as to consist of activated carbon fibers (pref. PAN-based or pitch-based ones) treated with nitric acid. Preferably, the above odorants contain dimethyl sulfide (hereafter, abbreviated to 'DMS'), tetrahydrothiophene (hereafter, abbreviated to 'THT') and t-butylmercaptan (hereafter, abbreviated to 'TBM'), and a fuel gas containing an odorant such as DMS, THT or TBM is passed through the above adsorbent treated with nitric acid to remove the odorant. |
