乙二醇再生回收技术在海上平台的应用

摘要

乙二醇（MEG）再生回收装置首次应用于海上平台，其流程包括预处理、再生和脱盐3部分。预处理通过闪蒸脱除MEG富液中的轻烃并加入NaOH，利用化学反应脱除能生成沉淀物的二价盐。再生过程是在低压下利用精馏原理将轻组分（水）与重组分（MEG）分离，获取质量分数高于80％的MEG贫液。MEG贫液脱盐采用负压闪蒸的方法使可溶性一价盐（Na＋等）和MEG分离，最终获得合格的MEG贫液。装置性能稳定可靠，MEG损失量少，具有广阔的应用前景。%The MEG regeneration and reclamation technology is successfully applied to off-shore platform .The process includes MEG pre-treatment ,regeneration and desalination .The pre-treatment section is designed to remove hydrocarbon from the rich MEG and divalent metal salts ,which can generate precipitation by reacting with sodium hydroxide .Adopting distillation column ,the MEG regeneration section operates at a pressure slightly above the atmospheric pres-sure ,and the mass concentration of lean MEG solubility should be more than 80% .The key technology of the process is desalination ,w hich uses a vacuum flash separator to crystallize and remove the high soluble one valence salts ,and primarily sodium salts from the lean MEG .The MEG regeneration and reclamation package has good performance and less MEG loss .Therefore , it has a variety of applications in prospect .