OXIDATIVE ABSORPTION OF HYDROGEN-SULFIDE BY A SOLUTION OF FERRIC NITRILOTRIACETIC ACID COMPLEX IN A COCURRENT DOWN FLOW COLUMN PACKED WITH SMV-4 STATIC MIXERS

被引:21
作者
DEMMINK, JF [1 ]
WUBS, HJ [1 ]
BEENACKERS, AACM [1 ]
机构
[1] UNIV GRONINGEN,DEPT CHEM ENGN,9747 AG GRONINGEN,NETHERLANDS
关键词
D O I
10.1021/ie00036a013
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The reactive absorption of hydrogen sulfide into a solution of the ferric chelate of nitrilotriacetic acid (NTA) was studied at 13 degrees C in a cocurrent down flow column packed with stainless steel Sulzer SMV-4 static mixers. The concentration of ferric chelate varied from 200 to 30 mol/m(3); the pH ranged from 8.3 to 6.7. Volumetric liquid-phase mass transfer coefficients for H2S (k(L) alpha) could be measured and were correlated by k(L) alpha = 0.0572E(L)(0.55) for 0.060 less than or equal to U-L less than or equal to 0.156 [m/s], 0.59 less than or equal to U-G less than or equal to 2.95 [m/s], and 1.4 x 10(2) less than or equal to E(L) less than or equal to 3 X 10(3) [N/m(2)s], in which E(L) is the liquid energy dissipation factor and U-L and U-G are the superficial liquid and gas velocity, respectively. The k(L) alpha values observed with H2S under reactive conditions appeared to be approximately a factor of 4 higher than those observed for oxygen absorption in the same liquid over the same packing. The cause of the extra volumetric mass transfer obtained with H2S under similar conditions is not well understood yet. The reaction kinetics of hydrogen sulfide with the ferric chelate of NTA was found to be first order in both ferric NTA and H2S for 0.40 < p(A) < 0.8 kPa, 0 < C-Fe(III) < 200 mol/m(3), and 6.7 < pH < 8.2.
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页码:2989 / 2995
页数:7
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