The invention relates to an adsorbent for purifying
coal ethylene glycol and a preparation method of the adsorbent for purifying the
coal ethylene glycol. The adsorbent is used for removing trace impurities including aldehydes, esters, acids, micro-
molecular nitrogen oxides or organic amine compounds and the like in a
coal ethylene glycol product. The invention relates to modified
active carbon which is used as the adsorbent; the
ethylene glycol passes through a
bed layer filled with the adsorbent at a
room temperature and the trace impurities which can influence the light
transmittance can be electively remained in the
bed layer so that the content of the impurities of the product is reduced; and the
ultraviolet light
transmittance and the acidity of the coal
ethylene glycol are improved and the
chromaticity of an
ethylene glycol distilled residual solution is reduced. The refining temperature is 20-50 DEG C and the liquid-phase air speed is 1.5hr<-1>. After the treatment of the method, the purity of the ethylene glycol is improved by 0.5% and the
ultraviolet light
transmittance (UV) reach 88% at 220nm, reach 96% at 275nm and reach 99.5% at 350nm; the acidity can reach 1ppm-8ppm; and the
chromaticity of the distilled residual solution reaches the level equal to that of
petroleum ethylene glycol and the standards of
polyester-grade products are reached.