. Sulphite waste liquor and its possible utilization ... ed by thepassage of air through the liquor to carry off the SO,. Since thewaste liquor is acid, this may be considered to be the effect of acid boiling commenced TABLE IX Time mg. S02 elapsed I, sol. per cc. hrs. :min. cc. liquor 0:00 1:25 b 2:00 2:36 3:14 4:10 5:16 6:10 6:38 7-15 1 cc. of standard T2 solution equivalent to mg. of SO, IS treatment. After several hours of boiling, the S02 content reachesa nearly constant figure. We hav
. Sulphite waste liquor and its possible utilization ... ed by thepassage of air through the liquor to carry off the SO,. Since thewaste liquor is acid, this may be considered to be the effect of acid boiling commenced TABLE IX Time mg. S02 elapsed I, sol. per cc. hrs. :min. cc. liquor 0:00 1:25 b 2:00 2:36 3:14 4:10 5:16 6:10 6:38 7-15 1 cc. of standard T2 solution equivalent to mg. of SO, IS treatment. After several hours of boiling, the S02 content reachesa nearly constant figure. We have performed the experiment in the laboratory and haveexamined the SO, content during the course of boiling. Some ofthe data are here reproduced, together with their graph, Table IX,Figure 9. In the analyses, the S02 was split out by alkali at a high tem-perature, that attainable by a water bath. These data lead to thesame conclusion as the data on the velocity of reaction, namely,that there are two kinds of SO, and that one kind is present in an o 3 4 5 6 Time in Hours amount twice that of the other. For example, one liquor mg. of SO., per cc. before heating was commenced, and afterabout four hours, when the S02 content had reached a minimum,or rather a nearly constant figure, mg. per cc. The amountremoved by boiling was mg. per cc, while the amount un-affected was One is approximately twice the other. The total amount of sulphur is the liquor, expressed as milli-grams of S02 per cc. is about 7 in the case of liquor A. Therefore,in addition to the two kinds of SO, already discussed, there mustbe at least one more kind, and there probably are several. These,however, are not removed by alkali treatment nor by boiling. 16 Summarizing: 1. The titrations for free S02 and loosely combined S02 havebeen investigated, and the conditions laid down for the most ac-curate titrations. 2. The splitting out of S02 by means of alkali has been in-vestigated, a
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectwoodpul, bookyear1922
