  EXO-200 is a single phase liquid xenon detector designed to search for
neutrinoless double-beta decay of $^{136}$Xe. Here we report on a search for
various Majoron-emitting modes based on 100 kg$\cdot$yr exposure of $^{136}$Xe.
A lower limit of $T^{^{136}Xe}_{1/2} >1.2 \cdot 10^{24}$ yr at 90% C.L. on the
half-life of the spectral index = 1 Majoron decay was obtained, corresponding
to a constraint on the Majoron-neutrino coupling constant of $|< g^{M}_{ee}
>|<$ (0.8-1.7)$\cdot$10$^{-5}$.
