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A special variant, the Nokia Lumia 521, was created for T-Mobile US. The 521 is slightly longer than the 520 at 124.0 mm [30] (vs. 119.9 mm [31]), so accessories such as cases and screen protectors manufactured for the 520 do not fit the 521. The Nokia Lumia 521's first retail release was on 27 April 2013. [32]
MDEA is less reactive towards CO 2, but has an equilibrium loading capacity approaching 1 mole CO 2 per mole amine. [2] It also requires less energy to regenerate. [2] To combine the advantages of MDEA and the smaller amines, MDEA is usually mixed with a catalytic promoter such as piperazine, PZ, or a fast reacting amine such as MEA to retain reactivity, but lower regeneration costs.
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