With Sulfur Compounds
With Sulfur Compounds
复制标题
DOI：
10.1002/9780470145159.ch154
复制
发表时间：
2007-05
期刊：
影响因子：
--
通讯作者：
A. Towl
中科院分区：
文献类型：
--
作者：
A. Towl
Blog1，Kp=z A-T，其中Kp是由H、S和H的部分P确定的平衡常数，通常用流动技术，而A和B是常数。表1列出了所研究的反应，T以及系数A和B。虽然大多数数据是关于冶金过程和还原固相产物的性质3，但在两个例子中，它们涉及从FeS和硫化锌中生成H，S，这是在使用催化吸收剂氧化锌和铁、氧对用于水蒸气重整的碳氢原料进行催化脱硫时产生的。在1000K的部分P比P，S：P，2可用于多次还原I_8，对于完全还原到金属，其顺序为：Ag，S，PTS，SnS，PbS，WS，Cu，S，FeS，MoS，NiS，CoS，ZnS，CaS。在可以与表1中的数据进行比较的情况下，可以感觉到排序的大致相似，但平衡常数的大小与T相关且准确的数据中的插值值不同。黄铁矿或铁铁矿还原为铁粉最好分两个阶段进行，还原为FeS的温度为5770K，但如果要进一步还原为金属粉末，则不能超过Fe变塑性的温度。为此，矿石被部分还原，然后淬火和干燥，然后用H，进一步还原。在这个过程中，H，S的形成从1020K开始，在1120-1220K完成。热重研究表明，在670-770K，FeS_2被还原为FeS，由FeS生成H，S的起始温度为820K，2‘。在H，O蒸气存在下，FeS被H还原平衡生成22H，S，SO和S元素。进一步的数据是关于H，-H，S-Ag，S在573K23，24，H，-H，S-铜，S在658K2，和H，-H，S-铜，S(L)在1418-1520K，其中铜，S用铜饱和25。关于均衡的数据：
B log,, Kp= z A-- T where KP is the equilibrium constant determined from the partial P of H, S and H,, usually by a flow technique, and A and B are constants. The results are set out in Table 1 in terms of the reaction investigated, T and the coefficients A and B. Although most data are obtained in regard to metallurgical processes and the nature of the solid products of the reduction, in two instances3 they relate to the formation of H, S, from FeS and ZnS, which is produced during catalytic desulfurization of hydrocarbon feedstocks for steam reforming using the catalytic absorbers ZnO and Fe, O,. Values of the partial P ratio P, s: P, 2 at lo00 K are available for a number of reductionsI8, which for complete reducbon to the metal decrease in the order Ag, S, PtS, SnS, PbS, WS,, Cu, S, FeS, MoS,, NiS, CoS, ZnS, CaS. Where comparison with the data in Table 1 is possible, a rough similarity of ordering can be perceived, but the magnitudes of the equilibrium constants differ from those interpolated in the T-dependent and accurate data.Less-quantitative results are available. The reduction of pyrite or marcasite to Fe powder is best carried out in two stagesI9; reduction to FeS occurs at 5770 K, but if further reduction to metal powder is to be achieved, the T at which Fe becomes plastic must not be exceeded. To do this the ore is partly reduced, then quenched and dried and then further reduced by H,. The formation of H, S in this procedure begins at 1020 K and is completed at 1120-1220 K. Thermogravimetric studies indicate that FeS, is reduced20 to FeS at 670-770 K and that the initiation T for the production of H, S from FeS is 820 K20, 2'. The reduction equilibrium of FeS by H, in the presence of H, O vapor produces22 H, S, SO, and elemental S. Further data are available on the systems H,-H, S-Ag, S at 573 K23, 24, H,-H, S-Cu, S at 658 K2, and H,-H, S-Cu, S (l) at 1418-1520 K in which the Cu, S is saturated25 with Cu. Data on the equilibrium: