迈特尔膜技术有限公司

网站首页 > 主要产品 > 2.石化领域中的应用 > 聚丙烯生产

    石化领域中聚丙烯生产

    • 型号
    • 品牌
    • 价格

    聚丙烯生产/POLYPROPYLENE PRODUCTION

    1. 详细信息

    问题
    在聚丙烯(PP)生产过程中,一部分丙烯原料会损失。这部分损失的原料价值是巨大的,对一套典型的聚丙烯装置范围在一百万到三百万美金每年。丙烯损失发生在初始树脂脱挥气。

    VaporSep® 解决方案

    对于树脂脱挥应用,排气物料经过压缩和冷凝分离出丙烯。但气体离开冷凝器后仍含有大量的丙烯。这部分气体送入到膜单元,将这部分物料分离成富含丙烯的渗透物料和提纯的氮气残余物料。渗透物料循环回到压缩机入口,之后经过冷凝以回收丙烯。提纯的氮气物料循环回到脱气仓。对于C3精馏塔塔顶的应用,VaporSep®单元非常简单,只包括膜组件,没有运动部件。离开塔顶的物料主要是丙烯与轻组分如氮气或氢气的混合物。VaporSep®单元将这股物料分离成富丙烯物料和富轻组分物料。富丙烯物料返回到精馏塔以回收丙烯,富轻组分物料放空或送往火炬焚烧。VaporSep®单元广泛用于主要的聚丙烯生产商,包括:Formosa塑料,英力士,沙比克,Sasol,和中石化。

    优点

    ■ 回收有价值的丙烯,典型回收周期小于1年。

    ■ 提纯后的氮气可在工艺中再利用

    ■ 采用撬装结构,最小化的安装时间和费用。
    ■ 减少焚烧和火炬需求。

    ■ 完成碳氢化合物回收效果显著高于通过单一冷凝的方法。
    ■ 与单一冷凝的方法相比,允许回收在缓和的温度和压力下进行
    ■ 最小化的面积和重量

    ■ 不产生二次污染源

    Problem
    During the production of polypropylene (PP), a portion of the propylene feedstock is lost. The value of the lost feedstock is substantial, ranging from $1 million to  $3 million per year for a typical polypropylene plant. Propylene losses occur primarily in resin degassing vents.

    VaporSep® Solution
    For resin degassing applications, the vent stream is compressed and then cooled to condense the propylene. The gas leaving the condenser still contains a significant amount of propylene. This gas is fed to the membrane unit, which separates the stream into a propylene-enriched permeate stream and a purified nitrogen residue stream. The permeate is recycled to the inlet of the compressor and then to the condenser, where the propylene is recovered. The purified nitrogen stream is recycled to the degassing bin.
    For C3 splitter overhead applications, the VaporSep® unit is very simple, consisting of membrane modules only, with no moving parts. The stream leaving the column overhead is primarily propylene, mixed with light gases such as N2 or H2. The VaporSep® unit splits this stream into a propylene-enriched stream and a lightgas-enriched stream. The propylene-enriched stream is returned to the distillation column, where the propylene is recovered, and the light-gas-enriched stream is vented or flared.
    VaporSep® units are currently used by major polypropylene producers including Formosa Plastics, Ineos, SABIC, Sasol, and Sinopec.

    Benefits

    ■  Recovers valuable propylene with typical payback time of less than 1 year

    ■  Purifies nitrogen for reuse  in the process

    ■  Minimizes installation  time and expense with  skid-mounted construction

    ■  Reduces incineration  and flare requirements

    ■  Achieves significantly higher hydrocarbon recovery than possible  by condensation alone

    ■  Allows recovery at more moderate temperatures and pressures than condensation alone

    ■  Minimizes footprint and weight

    ■  Creates no secondary waste streams