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    石化领域中环氧乙烷和醋酸乙烯单体生产工艺

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    环氧乙烷和醋酸乙烯单体生产工艺/ETHYLENE OXIDE (EO) AND VINYL ACETATE MONOMER (VAM) PRODUCTION

    1. 详细信息

    问题
    在环氧乙烷生产工艺中,氧气和乙烯反应生产环氧乙烷。单程转化率达不到100%,反应器操作采用循环模式。氩气存在于氧气原料中,在反应循环过程中累积,需要排放。醋酸乙烯单体生产工艺相似,只是需要醋酸也加入到反应器中。一部分乙烯原料将在反应器循环路径中随氩气排放时损失。对于一个典型的环氧乙烷或醋酸乙烯装置,原料损失的价值巨大,约为50万美元每年。
    VaporSep® 解决方案

    VaporSep® 单元包含一个单级膜系统用于从分离乙烯气和氩气。富乙烯渗 透物料被送入到现有压缩机中,之后返回到反应器中,富氩气残余物料去 火炬。
    VaporSep® 系统能够回收90%的被燃烧排放乙烯。现在EO主要生产商都在使 用VaporSep®系统,包括:三星,道达尔,PEMEX和台塑。醋酸乙烯生产商 包括:三星,BP和Dairen。

    优点

    ■ 回收有价值乙烯,回收周期少于一年。

    ■ 撬装结构,最少的安装成本
    ■ 最小化的尺寸和重量

    ■ 操作在温和的温度和压力下
    ■ 用最小的修改集成到现有操作中

    ■ 不需要增加转动设备

    Problem
    In ethylene oxide (EO) production, oxygen and ethylene are reacted to form EO. Since the conversion per pass is not 100%, the reactor is operated in loop mode. Argon, which enters with the oxygen feed, builds up in the reactor loop and must be purged. The vinyl acetate monomer (VAM) process is very similar except acetic acid is also fed to the reactor. A portion of the ethylene feedstock is lost with the argon purge gas from the reactor loop. The value of the lost feedstock is substantial — approximately $500,000 per year for a typical EO or VAM plant.
    VaporSep® Solution

    The VaporSep® unit consists of a single-stage membrane system that separates ethylene vapors from argon. The ethylene-enriched permeate is sent to an existing compressor, then returned to the reactor; the argon-enriched residue is flared.
    VaporSep® systems recover more than 90% of vent ethylene that would otherwise be flared. VaporSep® units are currently used by major EO producers including Samsung, Total, PEMEX and Formosa Plastics and VAM producers including Samsung BP and Dairen.
    Recovered

    Benefits

    ■  Recovers valuable ethylene with payback time of 1 year or less

    ■  Minimizes installation cost with  skid-mounted construction

    ■  Minimizes footprint and weight

    ■  Operates at modest temperature  and pressure

    ■  Integrates into existing operations  with minimal modifications

    ■  Requires no additional  rotating equipment