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| 铬铁矿加压液相氧化生产铬酸钠的工艺中采用醇洗浸碱的方法实现铬酸盐与苛性碱的分离，能耗低、成本低。本文对醇洗浸碱过程的甲醇与苛性钠的真空蒸馏分离工艺进行了研究。采用单因素试验考察真空度、温度、时间、碱浓度对甲醇回收率的影响，并确定初始工艺条件。正交试验确定最佳工艺条件。试验分析表明，真空度为0.01MPa，蒸馏温度为5℃，蒸馏时间为10min时甲醇回收率为59.35、纯度为95.1%，残液碱浓度900g/L，甲醇与残液分别可循环使用于前段浸碱工艺与液相氧化工艺。 |
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RXMCDM: 金币+1, 多谢应助！ 2014-09-21 10:40:46
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| In the pressurized liquid-phase oxidation process for the production of sodium chromate from chromite, methanol leaching, a low energy consumption and low cost method, is widely used to separate the alkali chromate and caustic alkali. In this paper, the separation processes in which the vacuum distillation of methanol and caustic soda was used in the methanol leaching were studied. The conditions for initial processes were determined by testing the effect of single factors, including vacuum degree, temperature, time and alkali concentration, on methanol recovery. The optimal process conditions were determined with orthogonal experiment. Experimental analysis showed that the methanol recovery rate was 59.35% and the purity was 95.1%, with the residual liquid caustic soda concentration of 900g/L when the degree of vacuum was 0.01MPa, the distillation temperature was 5℃ and time was 10min. The recovered methanol and the residual liquid can be reused in the alkaline leaching process and liquid phase oxidation processes, respectively. |
2楼2014-09-21 05:50:05
3楼2014-09-22 09:50:21