NOVELTY - The solvent comprises one or more mixed homologs of alkylene glycol alkyl ether, optionally with homologs of ethylene glycol. NH3 absorbed, is subsequently driven off.    USE - To remove of ammonia from synthesis gas by solvent scrubbing.    ADVANTAGE - In this process, the operating pressure can be as high as required. An especially efficient process is described. The vapor pressure of the solvent is sufficiently low, that the synthesis gas cannot be appreciably contaminated by it. Solvent does not combine with the NH3. The solution is a wide-boiling binary system, facilitating regeneration. Operation is particularly efficient when the process takes place in multiple stages with intercooling. The variant employing membranes, provides further insurance against solvent entry into the flow of synthesis gas.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the corresponding plant. The scrubber column contains packings, filling, and plate trays. It also has a cooler.    Preferred Features: Absorption is at -30 to 150 degreesC in counterflow or cross-flow, scrubber(s), bringing the solvent into contact with gas containing NH3, H2, N2 and CH4 at least.    Scrubbing is multi-stage with intermediate cooling.    In a variant, the solvent is kept from direct contact with the gas by an intervening membrane. Only gas can pass through the membrane, into the solvent.    Contactor(s) are employed, containing semi-permeable membranes.    Solvent regeneration is multi-staged. The gas is a synthesis gas used in a process for NH3 manufacture.    Adsorption takes place at 0 degreesC to 40 degreesC.    Solvent regeneration includes a first stage at reduced pressure and optionally increased temperature, effecting out-gassing.    Rectification then takes place, followed by a further regeneration at or below atmospheric pressure.    A similar three-stage process is described.    Recovered gas is rich in H2 and is employed for NH3 synthesis.    During the first or second regeneration stage a CH4-rich gas is recovered. This is re-used to make NH3-synthesis gas. These recovered gases can be used as fuel. NH3-rich gas is recovered in the third regeneration stage.    Waste heat is employed in the regeneration stages. Vapors from the last regeneration stage are compressed and condensed with those of the preceding stages. Vapors from the last regeneration stage are fed to the suction side of a refrigerant compressor.    The NH3-containing gases and vapors are cooled and compressed. Compressed NH3 gases and vapors are washed with cold, liquid NH3 and are thus freed of solvent middle residues, the resultant solvent-NH3 mixture being recycled into one of the regeneration stages.    Regeneration of the solvent is achieved or assisted by stripping with inert gas.    DESCRIPTION OF DRAWING(S) - A block diagram of the process is presented.    absorption (2)    H2 off gassing (6)    CH4 off gassing (10)    heat exchange (13)    loaded solvent to pressure reduction (18)