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| As one of the most important aromatic compounds, high purity of sodium 4-nitrobenzenesulphonate is widely used in nucleophilic substitution reaction,1 controlling of the mode of polymorphic transition,2 and effect of ionic liquids on a class of charge-neutral nucleophiles.3 It is in general produced by sulfonation of nitrobenzene with concentrated sulfuric acid. The isomeric mixtures are formed in various proportions of sodium 3-nitrobenzenesulphonate and sodium 4-nitrobenzenesulphonate with this method. The entire usage requires purified sodium 4-nitrobenzenesulphonate product. It is very difficult to separate sodium 4-nitrobenzenesulphonate at a high purity from this reaction product mixture. High-purity sodium 4-nitrobenzenesulphonate can be separated from the mixture of isomeric sodium nitrobenzenesulphonate by recrystallization from sodium chloride, sodium sulfate or ethanol aqueous solution. To purify sodium 4-nitrobenzenesulphonate using a simple method, measurements of the solubility data of sodium 4-nitrobenzenesulphonate in binary sodium chloride + water, sodium sulfate + water and ethanol + water solvent mixtures are needed. Although the solubility of sodium 4-nitrobenzenesulphonate in sodium chloride, sodium sulfate and ethanol aqueous solution is very important to the separation process, to the best of the authors’ present knowledge, solubility of sodium 4-nitrobenzenesulphonate has not been reported in literature.4-6 In this work,we measure the solubility of sodium 4-nitrobenzenesulphonate in binary sodium chloride + water, sodium sulfate + water and ethanol + water solvent mixtures using the steady-state method with the temperature range from (273.15 to 323.15) K.7-11 The data are correlated by a modified Apelblat equation. |
木蟲(chóng) (正式寫(xiě)手)
| 作為一個(gè)最重要的芳香族化合物,純度高4-硝基苯磺酸鈉被廣泛使用于親核取代反應(yīng),1控制多過(guò)渡態(tài)模式,2離子液體對(duì)一類中性親核試劑的影響。3這是一般由用濃硫酸磺化硝基苯。這些異構(gòu)體的混合物用各種比例的3-硝基苯磺酸鈉和4-硝基苯磺酸鈉通過(guò)這種方法形成的。整個(gè)使用需要純化4-硝基苯磺酸鈉產(chǎn)品。在這種反應(yīng)產(chǎn)物混合物中很難分離出高純度的4-硝基苯磺酸鈉?梢詮南趸交撬徕c異構(gòu)體的混合物中分離得到高純度的4-硝基苯磺酸鈉,通過(guò)再結(jié)晶氯化鈉,硫酸鈉或乙醇水溶液。為了使用一個(gè)簡(jiǎn)單的方法凈化4-硝基苯磺酸鈉,測(cè)量4-硝基苯磺酸鈉在二氯化鈉與水,硫酸鈉與水和乙醇與水混合二元溶劑中的溶解度是必要的。雖然4-硝基苯磺酸鈉在氯化鈉、硫酸鈉和乙醇水溶液中的溶解度對(duì)中分離過(guò)程非常重要,但據(jù)作者所知4-硝基苯磺酸鈉最好的溶解度尚未在文獻(xiàn)中有所報(bào)道。4-6在這項(xiàng)工作中,在溫度范圍(273.15至323.15)k下,我們使用穩(wěn)態(tài)方法測(cè)量了4-硝基苯磺酸鈉在氯化鈉與水,硫酸鈉與水和乙醇與水的二元溶劑中的溶解度,7-11數(shù)據(jù)與apelblat修正方程相關(guān)。 |

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