求翻译：化工生产常需进行液体混合物的分离以达到提纯或回收有用组分的目的，精馏是利用液体混合物中各组分挥发度的不同并借助于多次部分汽化和部分冷凝达到轻重组分分离的方法。精馏操作在化工、石油化工、轻工等工业生产中中占有重要的地位。为此，掌握气液相平衡关系，熟悉各种塔型的操作特性，对选择、设计和分析分离过程中的各种参数是非常重要的。是什么意思？

Chemical production often require the separation of liquid mixtures in order to achieve the purpose of purification or recycling of useful components, distillation is the use of different components in the liquid mixture volatility and by means of repeatedly partial vaporization and partial condensa

Chemical production needed to be separated by a liquid mixture in order to achieve purification or recovery of useful group, refining the purpose is to use liquid mixture in each group in the compounds and with the help of many different parts of vaporization and condensation to separate sub-group o

The chemical production often must carry on the liquid mixture the separation to achieve the depuration or the recycling useful component goal, the selective evaporation is uses in the liquid mixture various components volatile grade different and draws support many times the part vaporization and t

Separation of liquid mixtures chemical production is often required to achieve the purpose of purification or recovery of useful components, distillation is the use of liquid volatile components in the mixture of different and, through to some of numerous partial vaporization and condensation reache

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