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    石化领域中聚氯乙烯生产

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    聚氯乙烯(PVC) 生产/POLYVINYL CHLORIDE (PVC) PRODUCTION

    1. 详细信息

    问题
    聚氯乙烯(PVC)是由氯乙烯单体(VCM)聚合生成。未反应的VCM由泵送出反应器并经过冷凝,不凝气从冷凝器排放。依据冷凝器的温度和压力,排放气体中含仍有50-2000lb/hVCM。作为VCM排放,是有严格监管的,通常排放物料必须被焚烧并经洗涤后排放。

    VaporSep® 解决方案
    来自现有VCM冷凝器 的排气物料送入到VaporSep®系统中。VCM穿过膜的速度比惰性气体快,产生一股富VCM渗透物料和贫VCM残余物料。渗透物料循环回到现有压缩机入口,残余物料送往焚烧。通过VaporSep®系统回收的VCM,在现有冷凝器中冷凝回收。
    VaporSep® 系统能让当今的PVC生产商在排放气中回收90%到99 +%的VCM ,提供显著的经济效益。VaporSep® 系统被当今的PVC主要生产商使用,包括美国西方石油公司,西湖,索尔维和 Aiscondel。

    优点

    ■ 与单一冷凝方法相比,具有更高VCM回收率
    ■ 与单一冷凝方法相比,完成回收具有更温和的操作温度和压力
    ■ 最小化的尺寸和重量

    ■ 没有运动部件,最少的维修

    ■ VCM回收率达到99+%

    Problem
    Polyvinyl chloride (PVC) is produced by polymerization of vinyl chloride monomer (VCM). Unreacted VCM is pumped out of the reactor and condensed, and non-condensable gases are vented from the condenser. Depending on the temperature and pressure of the condenser, the vent stream also contains from  50 to 2,000 lb/h of VCM. As VCM emissions are tightly regulated, the vent stream must typically be incinerated and scrubbed before release.
    VaporSep® Solution

    The vent stream from the existing VCM condenser is sent to the VaporSep® system. VCM passes through the membrane at a greater rate than inert gases, producing a VCM-enriched permeate and a VCM-depleted residue. The permeate is recycled to the inlet of the existing compressor and the residue is incinerated. The VCM recovered by the VaporSep® system is condensed in the existing condenser.VaporSep® systems allow PVC producers to recover 90% to 99+% of the VCM  currently lost in vent streams, providing a significant economic benefit. VaporSep® systems are currently used by major PVC producers including  Oxyvinyls, Westlake, Solvay, and Aiscondel. 

    Benefits

    ■  Achieves significantly higher VCM recovery than possible by condensation alone

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

    ■  Minimizes footprint and weight

    ■  Minimizes maintenance with  no moving parts

    ■  VCM recovery up to 99+%