摘要：

石油炼化行业多采用甲基二乙醇胺（MDEA）对炼厂气等气体进行净化。MDEA可选择性脱除硫化氢，具有稳定性好、不易降解、对管路腐蚀小、工艺设备投资及操作费用低等特点，但抗污染能力较差。MDEA净化运行过程中会不断积累固体颗粒、降解物质、腐蚀物、二价金属离子、有机物等污染物并产生泡沫，导致炼厂气净化度低、脱硫剂大量损耗，给下游污水处理系统造成处理压力。制备了一系列非硅系MDEA液消泡剂样品，进行性能筛选与安全性能评价，研究其消泡性能、MDEA液污染影响，及对脱硫系统及后端污水处理系统的影响。在某炼化企业炼厂气脱硫系统进行现场应用，结果表明，该MDEA专用消泡剂能有效解决MDEA脱硫系统的泡沫问题，且不影响MDEA液、脱硫系统和污水系统的运行。

关键词: 甲基二乙醇胺, 消泡剂, 脱硫系统, 炼化污水

Abstract:

Methyldiethanolamine(MDEA) is often used to purify refinery gas etc. in petroleum refining and chemical industry. MDEA can selectively remove hydrogen sulfide, and has the characteristics of good stability, not easy to degrade, little corrosion to pipeline, low investment and operation cost, but poor pollution-resistant ability. In the process of purification, the pollutants such as solid particles, degradation products, corrosion substances, divalent metal ions, organic matters and so on will accumulate in MDEA solution, and produce foam, resulting in low purification degree of refinery gas, large loss of desulfurizer. It puts pressure for the downstream treatment system. A series of non-silicon defoamers for MDEA were prepared. The performance and safety performance were screened and evaluated. The defoaming performance, pollution of MDEA solution, effects on desulfurization system and back-end sewage treatment system were studied. It was applied in the refinery gas desulfurization system of a refinery. The results showed that the defoamer could effectively solve the foam problem in MDEA desulfurization system, and be friendly for MDEA solution, desulfurization system and sewage treatment system.

Key words: MDEA, antifoaming agent, desulfurization system, refinery wastewater

中图分类号: 

• X74