液相高精度吸附脱除SO2新工艺在混合脱氢装置的工业应用

Industrial application of a new process for high-precision adsorption removal of SO2 from liquid phase in a mixed dehydrogenation unit

关键词:  液相异丁烷  烷基化碳四  SO₂  高精度  吸附脱除  再生  分子筛  浓硫酸 

Key words:  liquid phase isobutane  alkylated C₄  sulfur dioxide  high precision  adsorption removal  regeneration  molecular sieve  concentrated sulfuric acid

摘要:

目的 脱除作为混合脱氢装置原料的烷基化碳四(C₄)中的SO₂杂质,控制SO₂体积分数＜1×10-6。方法 采用液相高精度吸附脱硫工艺,通过吸附再生的方式实现其连续运行。当原料通过吸附脱除SO₂达到饱和后,流程上可通过氮气循环置换、升温汽提及空气再生的手段,重新恢复SO₂吸附剂的吸附能力,并再次投入生产使用,以确保装置的安全平稳长周期运行。结果 采用液相高精度吸附脱硫工艺可将烷基化C₄中SO₂体积分数从30×10-6~400×10-6脱除至1×10-6以下。结论 对吸附脱硫工艺的吸附剂、工艺流程进行优化调整,缩短了吸附剂的再生时间,保障了装置工业化连续运行。同时,液相高精度吸附脱硫工艺流程操作简便,能耗较低,安全风险较低。 

Abstract:

Objective The aim is to remove the SO₂ impurities in the alkylated C₄ as the raw material of the mixed dehydrogenation device and control the SO₂ volume fraction less than 1×10-6. Methods The liquid-phase high-precision adsorption desulfurization process was used to achieve continuous operation by adsorption regeneration. When the raw material was saturated by removing SO₂ with adsorption, the adsorption capacity of SO₂ adsorbent could be restored by means of nitrogen cycle replacement, heating stripping and air regeneration in the process, and put into production again to ensure the safe, stable and long-term operation of the unit. ResultThe SO₂ volume fraction in alkylated C₄ could be removed from 30×10-6-400×10-6 to less than 1×10-6 by adopting the liquid-phase high-precision adsorption desulfurization process. Conclusion sThe adsorbent and process flow of the adsorption desulfurization process were optimized and adjusted, which shortened the regeneration time of the adsorbent and ensured the continuous operation of the device industrialization. At the same time, the liquid phase high-precision adsorption desulfurization process is simple to operate, which has low energy consumption and safety risk.