Method for separating a component mixture comprising hydrogen, methane, hydrocarbons having two carbon atoms and hydrocarbons having three and more carbon atoms, comprising deethanization and demethanization which follows the deethanization, wherein - in the deethanization, at least a part of the component mixture is subjected to a first partial condensation by cooling from a first temperature level to a second temperature level at a first pressure level to obtain a first gas fraction and a first liquid fraction, - in the deethanization, at least a part of the first gas fraction is subjected to a second partial condensation by cooling from the second temperature level to a third temperature level at the first pressure level to obtain a second gas fraction and a second liquid fraction, - in the deethanization, at least a part of the first liquid fraction and at least a part of the second liquid fraction are subjected to a rectification using a rectification column to obtain a third gas fraction and a third liquid fraction, - the second partial condensation is carried out such that the second gas fraction comprises more than 95% hydrogen, methane and hydrocarbons having two carbon atoms, - the first liquid fraction or the part thereof subjected to rectification and the second liquid fraction or the part thereof subjected to rectification are decompressed from the first pressure level to a second pressure level before the rectification, and the rectification is carried out at the second pressure level, wherein the first pressure level is 25 to 35 bar and the second pressure level is 14 to 17 bar, and - a top gas formed during the rectification is cooled to -25 to -35°C and in the process is partially condensed, wherein a condensed portion of the top gas is used partly or completely as reflux in the rectification and a non-condensed portion of the top gas is partly or fully provided as the third gas fraction, and - the rectification column is cooled with a top condenser which is operated with propane refrigerants and/or propylene refrigerants, characterized in that - the condensed portion of the top gas or the part thereof which is used as reflux in the rectification is fed back to the rectification column without using a reflux pump and/or a reflux drum arranged outside the column. - in the deethanization, at least a part of the component mixture is subjected to a first partial condensation by cooling from a first temperature level to a second temperature level at a first pressure level to obtain a first gas fraction and a first liquid fraction, - in the deethanization, at least a part of the first gas fraction is subjected to a second partial condensation by cooling from the second temperature level to a third temperature level at the first pressure level to obtain a second gas fraction and a second liquid fraction, - in the deethanization, at least a part of the first liquid fraction and at least a part of the second liquid fraction are subjected to a rectification using a rectification column to obtain a third gas fraction and a third liquid fraction, - the second partial condensation is carried out such that the second gas fraction comprises more than 95% hydrogen, methane and hydrocarbons having two carbon atoms, - the first liquid fraction or the part thereof subjected to rectification and the second liquid fraction or the part thereof subjected to rectification are decompressed from the first pressure level to a second pressure level before the rectification, and the rectification is carried out at the second pressure level, wherein the first pressure level is 25 to 35 bar and the second pressure level is 14 to 17 bar, and - a top gas formed during the rectification is cooled to -25 to -35°C and in the process is partially condensed, wherein a condensed portion of the top gas is used partly or completely as reflux in the rectification and a non-condensed portion of the top gas is partly or fully provided as the third gas fraction, and - the rectification column is cooled with a top condenser which is operated with propane refrigerants and/or propylene refrigerants, - the condensed portion of the top gas or the part thereof which is used as reflux in the rectification is fed back to the rectification column without using a reflux pump and/or a reflux drum arranged outside the column.