TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: The hydrate obtained in the hydration reactor is supplied into the hydrate defusing apparatus to obtain a gas stream and a liquid stream. The liquid stream is discharged out of the hydrate defusing apparatus, and returned to the hydration reactor for recycling, after supplied by a circulating pump. Preferred Properties: The hydrate defusing apparatus is operated at 8-23 degrees C and pressure of 0.1-0.25 MPa. The volume ratio of flow rate of coal-bed methane supplied inside the hydration reactor and flow rate of hydrate working fluid inside the hydration reactor is 1:1-25:1. The content of methane in the coal-bed methane is 0.05-0.4 vol.%. The liquid holding amount of hydrate working fluid inside the hydration reactor is 40-60% with respect to volume of the hydration reactor.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Component: The apparatus for low pressure treating coal-bed methane further has a hydrate defusing apparatus with a hydrate slurry inlet, the hydrate slurry inlet communicates with the hydrate slurry outlet, a gas outlet for leading out the gas stream provided at the top of the hydrate defusing apparatus, a liquid outlet for leading out the liquid stream provided at the bottom of the hydrate defusing apparatus, a liquid circulating pump arranged at the pipe between the liquid outlet of the hydrate defusing apparatus and hydrate working fluid inlet of hydrate reactor, a heat exchanger (a) and a heat exchanger (b) arranged at pipe between the liquid outlet of the hydrate defusing apparatus and the hydrate working fluid inlet of hydrate reactor, the heat exchanger (a) is used to exchange the heat between the coal-bed methane before entering the hydration reactor and the hydrate slurry led from the bottom of the hydration reactor and the heat exchanger (b) heats the hydrate slurry via the heat exchanger (a), a heat exchanger (c) arranged at the pipe between the liquid outlet of the hydrate defusing apparatus and the hydrate working fluid inlet of hydrate reactor, the heat exchanger (c) lowers the temperature after the defused liquid stream processed at liquid circulating pump, and the liquid stream returns to the hydrate reactor for recycling as hydrate working fluid. The liquid outlet communicates with the hydrate working fluid inlet of the hydrate reactor.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The to-be-treated coal-bed methane contains oxygen. The hydrate working fluid is a mixed emulsion of an oil phase and a water phase solution in volume ratio of 1:1-5:1. The oil phase is kerosene, diesel oil or silicone oil. The water phase is water solution containing tetrahydrofuran having mass concentration of 10-30%. The hydrate working fluid contains surfactant and/or dynamic accelerator. Preferred Properties: The oil phase has solidifying point of -20 degrees C or less and saturated pressure at 30 degrees C of 0.05 MPa or less. The molar fraction of surfactant comprising emulsifying agent is 0.5-3%. The content of dynamic accelerator comprising sodium dodecyl benzene sulfonate, sodium hexadecyl benzene sulfonate and/or sodium dodecyl sulfate is 300-1500 ppm.