SU20079A1 - Installation for the treatment of benzene-containing absorption oil and weak ammonia water - Google Patents

Description

The existing methods for producing concentrated ammonia water and crude benzene are as follows. Weak ammonia water flows into the ammonia column and flows down the plates towards the rising sharp bottom from below. In this case, the hot steam entrains ammonia from weak ammonia water and ammonia-free water from the bottom plates is drained into the wastewater, and ammonia and water vapor are sent to the reflux condenser, then to the refrigerator, from which it is sent to the storage facility.

Extraction of benzene from coal absorption oil is a completely separate process, as follows. The benzene-rich absorption oil from the scrubbers is fed to the pressure tank, from where it is directed through the heat exchange element to the reshot heater and then to the ver: | the new part of the main column, where, as it flows down the plates, it encounters sharp steam. From the main column, benzene vapors and water come either to the bottom of the additional column or directly to the reflux condenser. In an additional column; .. rising up, they meet school. on its way down from the dephlegmator. phlegm. A pair of lighter products, from an additional column, are passed into. reflux condenser, condenser and separator, where benzene and water are separated according to specific gravity.

In order to combine both of these processes into one and release benzene from the absorption oil with the resulting ammonia gas, as well as simultaneous separation of phenols from the latter, in the proposed installation a gas reflux pipe of the ammonia distillation column is attached to the bottom of the benzene and distillation columns.

The installation diagram shown in the accompanying drawing is as follows: The ammonia gas, on leaving the reflux condenser of the ammonia distillation of the O column, is conveyed through a pipeline and into the benzene district column Ci towards the coal-containing absorbent that has run down. The oil enters the column Cj through the tube L through the heat transfer element —G and the reshofer. The benzene desulfurization takes place in the main GI column, where the crude benzene is distilled from the absorption oil by ammonia gas; here phenols are extracted from ammonia gas with benzene. From the column (L vapor of ammonia, benzene and water through pipe C goes to a dephlegmator (ii) or to an additional column, not indicated in the drawing, from where the S pipe goes to a condenser. Here, condensation of crude benzene and concentrated ammonia water takes place. From KOif eHcaTopa, raw benzene and concentrated ammonia water are piped / discharged into a separator where they are separated by specific weight. From reflux dish D, reflux containing the extracted phenol is discharged into tube L / into a special tank. what last we can t be added back to the circulating absorption oil.

Alternatively, the ammonia gas can be sent not to the main distillation column Cj, but directly to the additional column Co and then the process proceeds in the previous one. The oil released from benzene, after leaving the column Cj, passes through pipe d to the heat exchange element L, from which, for final cooling and release from the salts formed in blowing ammonia gas, of salts of triangular acids, mercaptides, sulfur | . ammonia, etc., is sent to a direct mixing refrigerator of the usual type. Further obtained

: The crude benzene is washed with a small amount of water to release ammonia remaining in it and the resulting washings are added to weak ammonia water.

: The subject of the patent.

I - Installation for processing containing benzene absorption oil and weak; ammonia water, characterized in that, in order to extract benzene from the absorption oil with ammonia gas and simultaneously release phenols from the latter, the gas pipe a reflux condenser L of the ammonia distillation column C is attached to the bitumen destillation column B.