Title: Method for producing sulfonated lignin
Application Number: 02100805 Application Date: 2002.01.24
Publication Number: 1434068 Publication Date: 2003.08.06
Approval Pub. Date: Granted Pub. Date: 2004.11.03
International Classifi-cation: C08H5/02
Applicant(s) Name: Dengzhou Laoting Industry Co., Ltd. Address: 474172
Inventor(s) Name: Ma Tingyun, Quan Guolin
Attorney & Agent: wu zhongren
Abstract:
     The method for producing sulfonated lignin from black liquor in straw pulp paper making process includes the following steps: taking black liquor from virgin pulp of rotary spherical digester, feeding the black liquor into evaporator to make evaporation and concentration; then make sulfonation reaction at normal temp. and normal pressure, firstly, adding formaldehyde, then adding sulfite and heating to more reaction, feeding the above-mentioned material into drying tower, drying to obtain the powder. Said product contains lots of active gene of sulfonic group and hydroxyl group, so that it has good solubility, high surface activity and dispersion property, mainly is used in disperse dyes, reduction dyes and dispersion and filling of water coal slurry.
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