| 摘要 |
<p>The present invention provides: a lignosulphonate production method comprising a step of preparing lignin which is obtained by using an acid to hydrolyse woody biomass (lignocellulosic biomass) and a step of subjecting the lignin to sulphonation at a temperature of at least 130°C, wherein, in the sulphonation step, a sulphide or bisulphide compound is added in an amount of between 0.6 moles and 2.0 moles per 200 g of lignin, and the sulphonation step is carried out at below pH 13; lignosulphonate produced by the method; and an admixture and concrete comprising same.</p> |
