Application of heat stable salts removal technology by electrodialysis in natural gas purification plant

The application of electrodialysis technology in removing the heat stable salts (HSS) in 730 m³ N-methyl diethanolamine (MDEA) solution of Puguang Natural Gas Purification Plant were analyzed. The results showed that in 200 pairs of homogeneous membrane and 100 V voltage operating conditions, the HSS mass fraction in the MDEA solution reduced from 3% to 0.5%, Cl^- mass concentration reduced from 1 300 mg/L to 200 mg/L, Na⁺ mass concentration reduced from 4 200 mg/L to 700 mg/L, MDEA concentration reduced from 41.47% to 40.42%. In addition, the electrodialysis desalination technology has the advantages of high efficiency, environmental protection, and no acid and alkali regeneration, which offers a new technical route for the purification of MDEA solution.