The invention relates to a method for production of trimethyl
gallium at high efficiency and low cost. The method includes: adding a
gallium-
magnesium alloy into a reaction kettle filled with an
inert gas, in the presence of an
ether solvent, conducting heating to 30-80DEG C under a stirring condition, adding an initiator, initiating a reaction, then introducing
methane chloride continuously till the end of the reaction, controlling the
reaction rate by controlling the introduction speed of the
methane chloride, evaporating the
solvent after the end of the reaction, carrying out
distillation under a
pressure reduction condition to obtain a complex of trimethyl
gallium and
ether, adding the complex into high
boiling point organic amine N(R')3, conducting
distillation to remove the
ether solvent, then further removing ether and low
boiling point impurities under a reduced pressure, finally performing decomplexation to obtain an
oxygen-free trimethyl gallium crude product, and rectifying the trimethyl gallium crude product so as to obtain high purity trimethyl gallium. By employing the
methane chloride gas and the gallium-
magnesium alloy to react to prepare trimethyl gallium, the reaction conversion rate reaches over 85%. Due to the low price of methane chloride, the production cost of trimethyl gallium can be greatly reduced.