至尊木虫 (知名作家)
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【答案】应助回帖
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RXMCDM: 金币+1, 多谢应助！ 2014-09-21 10:40:46
MASc-girl: 金币+50, 翻译EPI+1, ★有帮助 2014-09-22 08:38:35
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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. |
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