Calcium lignosulphonate was used to synthesize a spherical lignosulphonate resin in a cheap and non-toxic disperse medium by reversed phase suspension polymerization.The process conditions were optimized by orthogonal experiments.Under the optimal conditions(

T

=95℃

c

HCl

=3 mol·L

-1

m

HCHO

:

m

CLS

=7%

w

CLS

=50%)

globulation took about 20 min and the product was featured with excellent spherical shape

narrow particle size range

61.20%of water retention capacity

0.83 mmol·ml

-1

of total volume exchange capacity and 3.46 mmol·g

-1

of total exchange capacity.The results of Scanning Electron Micrograph and Scanning Probe Micrograph indicate that spherical lignosulphonate resin has a rugged surface with porous microstructure in the gel skeleton.The aver-age pore size of dry samples was determined to be 10.46 nm by the BET method.