石化领域中聚氯乙烯生产

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/h的VCM。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+%