与20万吨/年乙烯装置分离工段——脱乙烷系统工艺设计相关的英文文献

Section ethylene plant separation
Keywords:membrane,separation,ethylene,polyimide,polysulfone,synthesis.
ABSTRACT
The use of membranes for hydrogen separation has been applied commercially in recent years.Several new membrane materials,which are now commercially available,are seriously being considered for the separation of hydrogen both effectively and efficiently within the ethylene process.This study investigates the feasibility of
hydrogen separation from the cracked gas in an optimal manner before entering the low-temperature section of the
ethylene plant.This separation would consequently reduce the refrigeration load as well as the equipment size of the cold-box section.Polyimide membrane materials are very selective for hydrogen transport as compared to other
hydrocarbons,such as methane and ethylene.Polysulfone has also proven to be selective for the separation of
hydrogen from hydrocarbons.This study evaluates two new commercial polyimide membranes as well as a new polysulfone membrane and determines the feasibility of hydrogen separation before entering the low-temperature
section of the ethylene plant.The performance of the membranes and their effects on the overall ethylene process are also presented.
INTRODUCTION
A quick review of the chemical literature indicates that ethylene is one of the most important as well as one of the largest volume petrochemicals in the world today and serves as a key building block in the petrochemical industry.Conventional ethylene production involves the cracking of a hydrocarbon feed to form a mixture of hydrogen,methane,ethylene,ethane and heavier components that are separated by expensive cooling and distillation
processes.The realization that the separation and purification process steps in the ethylene production consume more than 70% of the total energy required,provides a strong motivation for evaluating the impact of new technology on this part of the production process.
Membrane technology has many advantages over other conventional technologies.These include lower capital
and operating costs,low maintenance cost and the ease of installation and operation [1].Membrane technology for
hydrogen separation from other gases was successfully applied in the last few years to recover hydrogen from tail gases in oil refineries.The first-large commercial application for membrane-based hydrogen systems was the
separation of hydrogen from nitrogen in ammonia plants.Membrane technology is also used commercially for
hydrogen/carbon monoxide (synthesis gas) ratio adjustment.
The membrane-based hydrogen separation in the past was based on low selective materials such as cellulose
acetate polymers.However,new polymer membranes with improved selectivity and flux rate are now available in
the market.For example,polyimides (Ube,Praxair),brominated polysulfone (Permea) are new selective membranes.The selective membranes provide a major opportunity to improve the economics for different gas separation applications.This study investigates the use of membrane-based technology for hydrogen separation in a commercial ethylene process.The goal has been to study the feasibility of separating the hydrogen from the cracked gas in an optimal manner before it enters the cryogenic section,to further decrease the refrigeration load in the latter unit.Different membrane materials available from recent studies are evaluated for this separation to obtain the maximum selectivity and flux performance.
Method for preparing polymer grade low-carbon olefin through separation of methanol pyrolysis gas
Abstract:The present invention provides a method for preparing the polymer grade low-carbon olefin through separation of the methanol pyrolysis gas,including steps of the compression,impurity removal,and absorption and separation.In the absorption and separation step,the pyrolysis gas is sent to the front-end ethylene removing column,and then is,with the C4 absorbent,further absorbed and separated to produce polymer grade ethylene products,polymer grade propylene products,and C4 and C5 products.The moderate-temperature and moderate-pressure separation without a cold box according to the present invention provides safer production process,less investment in the equipment,as well as easier separation and lower energy consumption as a result of the front-end ethylene removing and C4 absorption and separation process.

它是现代大型乙烯生产装置普遍采用的一种烃类裂解方法。东方化工厂采用六套裂解炉组成年设计生产12万吨的乙烯装置。 管式炉裂解生产乙烯的工艺已有60多年的。祝您找到。为你祈福。阿弥陀佛。

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它是现代大型乙烯生产装置普遍采用的一种烃类裂解方法。东方化工厂采用六套裂解炉组成年设计生产12万吨的乙烯装置。 管式炉裂解生产乙烯的工艺已有60多年的