Synthesis Of Amphiphilic Copolymers Dispersants SMASS And Their Effect On Rheological Behavior Of Coal-Water Slurry

Coal resources is abundant, while oil and gas is relatively scarce in China. As an important branch of clean coal technology, there is an important strategic significance to develop the coal-water slurry (CWS) technolog. In order to obtain high concentration CWS, which had good mobility and stability, the use of high performance and low cost dispersant is imperative.In this paper, properties of Shenfu coal were invested by proximate analysis, ultimate analysis and FT-IR method. The effect of particle size distribution and concentration of coal on rheological properties of CWS were studied by using advanced rotational rheometer. The results showed that reasonable particle size distribution can increase the concentration of CWS, and the higher the concentration, the worse the performance of CWS.Then, as dispersants of CWS, a series of amphiphilic copolymer called SMASS were synthesized via side chain grafting with different grafting degrees of p-aminobenzene sulfonic acid to styrene-maleic anhydride, and characterized by’H NMR and FT-IR. The effects of dispersants with different grafting ratio and their dosage on the rheological properties were investigated. Experiments have proved that the rheological properties of CWS can be improved by SMASS, and when the grafting ratio of SMASS is 0.28, the performance of SMASS is the best, and the best dosage of SMASS is 0.3-0.4%. The rheological curve basically corresponds to Herschel-Bulkley model.Finally, compared to poly(styrene-co-maleic anhydride naphthylamide sulfonate) (SMANS2 with grafting ratio of 0.50) and a commercial lignin dispersant (AD), the effect of SMASS2 (with grafting ratio of 0.49) was the best of all. And combined with the contact angle and Zeta potential, the mechanism of dispersant in CWS system was discussed, so as to lay the foundation for industrial applications and molecular design of dispersants.