The formaldehyde was an important chemical material .In recent years , with the booming of formaldehyde polymer industry , the usage of formaldehyde which was the important part of the formaldehyde polymer production was increased .A new standard for the quality of thick formaldehyde , and more rigorous and detailed requirements for the concentration technology of dilute formaldehyde were put forward .Nowadays , there were three concentration technologies of dilute formaldehyde of pressure rectification concentration technology , reduced pressure cyclone separation technology , and methylal oxidation technology . The three concentration technologies were introduced and the advantages and disadvantages were compared .%甲醛是一种重要的化工原料，近年来，随着甲醛下游产品中甲醛多聚物产业的蓬勃兴起，浓甲醛作为其生产的重要环节，使用量随之增加。这就对浓甲醛的质量提出了新的标准，也对稀甲醛浓缩工艺提出了更为严格和精细的要求。目前，我国稀甲醛浓缩工艺主要有加压精馏浓缩工艺、减压旋风分离工艺、甲缩醛氧化工艺三种，本文将对这三种工艺进行介绍，并对其优缺点进行对比。
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