从赤藓糖醇生产废弃母液中回收赤藓糖醇

The recovery of erythritol from the waste mother liquor

赤藓糖醇生产废弃母液的成分分析表明,母液中固形物含量约为70%,其中赤藓糖醇约占干物的30%,灰分约占干物的20%,检测不到葡萄糖。液相色谱分析结果表明,母液中有机固形物除赤藓糖醇外,还含有另外2种未知糖醇组分。实验主要探讨了从赤藓糖醇生产废弃母液中回收赤藓糖醇的可行性,重点考察了废弃母液的脱盐效果及其对赤藓糖醇回收的影响。以交换容量和产物的吸附为考察指标,筛选出D315和001*7阴阳2种离子交换树脂用于母液脱盐除杂,采用双柱串联工艺,活性炭脱色处理后的母液脱盐率可达98.5%。经减压蒸馏、降温结晶,母液赤藓糖醇结晶回收率达47.3%,纯度达99%以上。

The analysis results of the waste mother liquor during erythritol production showed that the solids contents were approximately 70% , the erythritol accounted for 30% of the solids contents, and the ash accounted for 20% of the solids contents, no glucose was detected. The HPLC results showed that there were two unknown sugar alcohol components in the mother liquor besides erythritol. This paper mainly discussed the feasibility of the recovery of erythritol from the waste mother liquor, and focused on the desalting effect on the mother liquor and its influence on the recoveries of erythritol. Based on the exchange capacity and adsorption characteristics, two best ion exchange resins, D315 and 001 ＊ 7, were screened. After the decolorization of waste mother liquor, the series connection of double pillar was employed and the desalting rate could reach 98.5%. Finally, according to the vacuum distillation and crystallization, the recovery rate reached 47.3% and the purity could reach more than 99%.