DE1546187A1 - Method and device for regenerating hydrochloric acid - Google Patents

Description

RUüHNER Ihdustriepianuags- ^ ktiengesellschaf t in Vienna (Austria)

Method and device for regenerating hydrochloric acid

In a modern process, the acidic metal chloride solution obtained when pickling iron, aluminum or the like can be used It is generally known that the pickling acid can be regenerated in such a way that the pickling acid is placed directly in liquid form in a directly heated furnace is sprayed. After separation of the solid roasted products iast represent pure metal oxide, is carried out from the vapors Cooling the hydrochloric acid recovered. If you don't use the oven wants to dimension too large, it cannot be avoided that a certain proportion of not yet completely dried droplets sticks to the side of the oven and only rusts to a firm crust here. This requires a pe rio denomination approval of the furnace interior, also the quality of the oxide produced through this. ”and coverings reduced.

Δs has now been found, surprisingly, that even with small Furnace dimensions that can be avoided if the?! metal chloride solution preferably with a 'temperature of Öü ° O or near the boiling point with a higher oil temperature in the Oven a ^ is injected. This effect is even more pronounced if the pickling acid is brought to a temperature above the boiling point under the Ifeberdruck which is already present in front of the nozzles.

4in itself is the amount of heat drawn in this way only a fraction of the amount of heat required for evaporation. It would therefore be assumed that the path along the droplet, the is needed for warming up, even a fraction of the total,

009809 / U05

distance required for drying, so that VorwäTEien has only a subordinate effect. Apparently it will but the length it takes the droplet to dry is ginz much more shortened. This observed effect is likely to significant differences in the heat transfer when warming up on the one hand and the evaporation on the other hand, so that the «» eglangsn to warm up the droplet and to 7er- (fempfen in a completely different way than the respective calorie consumption Relationships stand. You can use the pickling acid in each heat the form familiar to the Jiaot man. For example it is possible, because of the overpressure in front of the spray nozzles in one Coal heaters to heat the stain beyond the boiling point, However, heating to near is usually sufficient to the boiling point. Also the direct heating z.3. by blowing in von Lampf is quite possible.

According to one embodiment of the method according to the invention, however, the heating is effected by direct contact with fen hot vapors from the roasting oven. This harbors several Advantages in themselves, namely firstly the obvious advantage of extensive use of the palpable '.'arms Vapors, secondly, an even concentration of the stain before spraying. A third major advantage was included but lies in the fact that this direct heater is also a fine wash for the vapors to remove oxyd dust, bevar the hydrochloric acid obtained is condensed from them. All in all Not only consumption and heat utilization are considered apricot roaster increases, but it also becomes a practical salt store, regenerated oleic acid without switching on is more expensive and not completely effective dust collector obtained.

009809 / U05

The heater ¹¹ can have any suitable procedural form for the gas / liquid contacting ring, normally a corrosion-resistant packing element or a bell-shaped base element is completely sufficient for this purpose.

Fig. 1 shows an example of an embodiment of the invention Contraption.

The pickling bot ti eh 1 is in communication with the buffer tank 2, from which the pickling is fed to the nozzle 5 via pump 3 control valve Uid Hesseinrichtung 4, from which it enters the furnace interior 6 in droplet form and - in our example in cocurrent - through the Flame gases of the burner 7 is split into a teste ftiase, ζ-B- Fe ₂ O ^, and in a gas phase H ₂ + O ₂ + OO2 ⁺ 00 + H ₂ O + Hül. The largest T ₉ il of the solid phase collects at the bottom of the roasting chamber 6 and is discharged into the oxide container 8. A small part is taken out by the mechanical dust cleaner 9 and the oil is taken out by the heater 10, which simultaneously heats the pickling acid of the buffer vessel 2 by means of pump 11 in the circuit. The finely cleaned and cooled vapors are then cleaned of the hydrochloric acid in column I2 with DbpiiIßgna tor I5 in the usual Ibise, which runs directly back into the pickling tub 1.

Through the invention, the apparatuses K) and 41 were added: a column and, for example, a puape. Advantageously, however, columns IO and 12 , for example, can be stacked one above the other in one component (FIG. 2).

0098 09/1405

~ ⁵ - 8AD ORIGINAL

Claims (1)

1646187 DΓ. Expl. J I. «Mm sur« .gmerierwg τοη Safe «,,» _aue ^dur <* * »Wrt-n *, Bei ,. "" - ^ ¹ ** · -. * Befee before a «wära,« «ng ^ iae _on a. V.rfete.a _nao h _saying i, k _contact "Ft," r * T _ifc STJT * ^ritet “Out of them a” iaetaia> aufninot. J. Tbttiahttng £ ur Durohfiihrwg _fce method, aaoh h " «Smelled a, i«. _{eiaen Λβ} ) """," ^ ^ί2) "* ^ * ·» · * · 3 _P rühö _{t £} (6, ^C9) JO), fcr to al «« ae] .it * g «wisch« meohanifchtr . * ■ Mftre »« · »(2) i» circles are added 009809 / U05 ao-5.-65 Til er.i, / t