羧甲基纤维素铜(Ⅱ)用于液态烃脱硫醇研究
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摘要: 用羧甲基纤维素钠和硫酸铜溶液制备出不溶性的羧甲基纤维素铜(Ⅱ)材料，以含16×１０-6噻吩和96×１０-6正戊硫醇的石油醚为模型样，研究了该材料对硫醇的脱除效果。结果表明,羧甲基纤维素铜(Ⅱ)在室温下以24.0h-1空速可以将模型样品中的硫醇完全脱除，模型样品的脱除容量达到925mL/g，脱硫醇容量1.86mmol/g。利用XPS研究材料使用前后铜离子价态的变化，发现材料中的正二价铜离子转变成正一价，通过GCMS分析脱硫醇后的模型样品硫醇的变化，确认硫醇被氧化生成二硫化物，从而证实了羧甲基纤维素铜(Ⅱ)材料脱硫醇是一个氧化-还原过程。Abstract: Copper(II) carboxymethylcellulose was prepared with sodium carboxymethylcellulose and copper sulphate in aqueous solution. Sweetening properties of copper (II) carboxymethylcellulose in liquid hydrocarbon was studied using petroleum ether containing 96×10-6 n-pentanethiol and 16×１０-6 thiophene as a model solution. Mercaptan in the model solution could be cleaned out at 24.0h-1 space velocity at room temperature. Sweeten capacity of copper (II) carboxymethylcellulose is 925mL/g for the model solution or 1.86mmol/g for mercaptan. Copper (I) that reduced from copper(II) was found in saturated cuprum carboxymethylcellulose material by XPS. Dipentyl disulfide, the oxidation product of n-pentanethiol, was detected in the model solution after sweetening by GC-PFPD. The sweetening mechanism of copper (II) carboxymethylcellulose was confirmed as an oxidation-reduction process.
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Key words:
- carboxymethylcellulose /
- copper /
- sweetening /
- mechanism
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