Using TLE2426 as opamp rails supplies
That device is a virtual ground maker. That is, it creates a reference point half way between the rails. You would supply your op-amps with 24V and Ground and use the output of this device as your signal/analog ground. 

Something like this.







simulate this circuit &ndash; Schematic created using CircuitLab

Note internals of the rail-splitter is simply a voltage divider and a unity gain op-amp buffer. 



As such it can't source or sink more than 20mA so do not use it for higher currents.

Addition: Note the circuit can be equally labelled as follows.







simulate this circuit