介绍了混合碳四催化异构丁烯提浓工艺流程、原理、特点及工业应用。混合碳四中低沸点组分1-丁烯经固定床反应器、催化蒸馏塔深度异构化为高沸点的2-丁烯组分，提高了轻重关键组分沸点差。催化蒸馏塔顶得到异丁烷产品，塔底得到高烯烃碳四。与萃取精馏工艺相比，该工艺具有流程短、投资省、能耗低、产品质量好、总烯烃损失率低、无废水产生、环境友好、易于操作等优点，已有数套工业装置应用。

This paper introduces the process flow,principle,characteristics and industrial application of butene enrichment technology by catalytic isomerization of mixed C₄ hydrocarbons.1-Butene,a low boiling point component in mixed C₄ hydrocarbons,is deeply isomerized into 2-butene with a high boiling component by fixed bed reactor and catalytic distillation column,which enlarges the boiling-point difference between light key components and heavy key components.Isobutane can be obtained at column overhead and high-concentration C₄ olefin can be gained at column bottom.Compared with the extractive distillation process,this enrichment process has the advantages of short flow,low investment,low energy consumption,stable product quality,lower total olefins loss,no wastewater,environment-friendliness and easy operation.There are already several industrial plants employing this process.