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首页> 外文期刊>Separation and Purification Technology >Cleavage of C-S bond in thiourea by electron transfer process with Cu~+ ion as a model study of sulphur removal and recovery
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Cleavage of C-S bond in thiourea by electron transfer process with Cu~+ ion as a model study of sulphur removal and recovery

机译：电子转移过程中Cu〜+离子裂解硫脲中C-S键的模型研究

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This communication reports a novel process of the formation of elemental sulphur(S deg )that involves a specific electron transfer process(ETP)from a model organic sulphur compound thiourea.Solubility of CuCl in different systems were studied at 30 deg C.Treatment of Cu~+ as CuCl with naphthalene,an electron transfer agent taken in a protic solvent ethanol produces ion-radical i.e.,naphthalenide anion.Formation of this ion-radical was proved by the solubility of copper in the absence and presence of naphthalene as well as by the absorption study at 30 C.Increased solubility of copper in a system containing CuCl,naphthalene and thiourea in ethanol further proved the generation of ion-radical.Production of(S deg )in the temperature range of 30-40 deg C suggested the cleavage of C-S bond present in the organic sulphur compound.The effect of reaction time revealed that the formation of S deg was not continuous.Temperature had a profound influence on the formation of S deg as substantial increase in the formation of S deg was observed for every 5 deg C rise in temperature.The method succeeded in removing 66.4 mol% sulphur from thiourea as S deg at 6h and 40 deg C.Discontinuity in the formation of S deg inferred trapping of minor amount of it by the dissolved S~(2-)ion leading to the formation of probably S~(2-),the formation of which proceeded at a slow rate.Pseudo-first-order kinetic model was used to unfold the rates of formation of S deg .In the temperature range of 30-40 C,intrinsic rate constant of S deg generation was found in the range of(8.3-40.6)X 10~(-6)s~(-1).The S deg formation process possessed an activation energy of 114.9 kJ mol~(-1)and a preexponential factor of 5.8X 10~(14)s~(-1)The way by which S deg was formed has a considerable relevance in the desulphurization of organic sulphur compound and the recovery of S deg from fossil fuels.
机译：该文报道了一种新型的元素硫形成过程（S deg），该过程涉及模型有机硫化合物硫脲的特定电子转移过程（ETP）。在30°C下研究了CuCl在不同系统中的溶解度。 〜+为带有萘的CuCl，在质子溶剂乙醇中吸收的电子转移剂产生离子自由基，即萘阴离子。通过在不存在和存在萘的情况下铜的溶解性以及通过在30°C时进行吸收研究。在含CuCl，萘和硫脲的乙醇体系中铜的溶解度增加进一步证明了离子自由基的产生。在30-40℃的温度范围内产生（S deg）表示裂解反应时间的影响表明，S deg的形成不是连续的。温度对S deg的形成具有重大影响。温度每升高5°C观察到S°形成的增加，该方法成功地从6小时和40°C的硫脲中脱除了66.4 mol％的硫脲硫磺。溶解的S〜（2-）离子导致大量S〜（2-）的形成，并以缓慢的速率进行。利用伪一阶动力学模型来揭示S〜（2-）的速率。在30-40°C的温度范围内，S deg的本征速率常数在（8.3-40.6）X 10〜（-6）s〜（-1）范围内。形成过程具有114.9 kJ mol〜（-1）的活化能和5.8X 10〜（14）s〜（-1）的前指数因子。Sdeg的形成方式与有机物的脱硫有很大的关系。硫化合物和从化石燃料中回收S deg。

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