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用容积7 L的气/液逆流反应超重力机,强化TEA水溶液单次瞬时吸收常压,进气量为500 mL/min,含CO_2体积分数为6%的模拟海上油田伴生气,优化出CO_2脱除率达80.5%的单一TEA型吸收剂的处理条件:TEA质量分数为20%,超重力机转速为2 000 r/min,温度为30℃,气液体积比为10∶1。为了提高CO_2脱除率,在TEA质量分数为20%的水溶液中添加不同质量分数的NaOH,组成质量分数为0~20%的Na OH与20%TEA的复合吸收液,进行了CO_2的脱除实验。结果表明:5%NaOH+20%TEA的复合液对CO_2的单次瞬时脱除率达98%以上,明显高于单一TEA溶液对CO_2的脱除率。在180~480 min内,该复合液对CO_2的连续脱除率明显高于5%Na OH和20%TEA 2种单一吸收剂在相同的时间内对CO_2的脱除率之和,且无Na_2CO_3结晶析出过多而阻塞管道的现象。
A 7 L volumetric gas / liquid countercurrent reaction supergravity machine was used to enhance the single instantaneous absorption of TEA aqueous solution at a constant pressure of 500 mL / min with 6% CO 2 in simulated offshore oilfields, optimizing CO 2 The removal rate of 80.5% single TEA-type absorbent processing conditions: TEA mass fraction of 20%, super-gravity machine speed of 2000 r / min, the temperature is 30 ℃, the volume ratio of gas to liquid 10: 1. In order to increase the removal rate of CO 2, different concentrations of NaOH were added to 20% aqueous solution of TEA to form a composite absorption solution with a mass fraction of NaOH and 20% TEA of 0 ~ 20% experiment. The results showed that the single instantaneous removal rate of CO 2 by 5% NaOH + 20% TEA was more than 98%, which was significantly higher than that of single TEA solution. The continuous removal rate of CO 2 from 180 to 480 min was significantly higher than that of 2 kinds of single absorbents of 5% NaOH and 20% TEA in the same time, and there was no Na_2CO_3 Excessive crystallization of the phenomenon of blocking the pipeline.