US1165281A - Acid-absorbing apparatus. - Google Patents

Description

P. A. PAULSON.

ACID ABSORBING APPARATUS. APPLICATION FILED 11m11.191s.

1,165,281. 1 Patented Deo. 21, 1915.

2 SHEETS-SHEET i.

P. A. PAULSON.

ACID ABSORBING APPARATUS.

APPLICATION, FILED MAY l1. 1915.

1,165,281. Patented 1190.21, 1915.

2 SHEETS-SHEET 2.

y Ivar/51,2507? narran srnrns riaranr ersten PETER A. PAULSON, OF APPLETON, WISCONSIN.

i ACID-Ansomame- APPARATUS.

apparatus, and particularly to towers for the preparation of -calcium 'bisulite solutions and for like purposes.

It is well known that recent practice-in' the preparation of calcium bisulite solutions requires that these solutions should be substantially saturated with uncombined sulfurous acid. Inasmuch as it has not proven practicable in the past vto prepare such solutions in a single operation, it is customary lto complete the saturation of the solutions in a supplementary device known as the auxiliary tower. v

The apparatus hereinafter described is capable of delivering the bisulfite solution at .the required degree of saturation, and recourse to an auxiliary tower or equivalent device is therefore unnecessary. This results in a material saving in the initial cost ofinstallation, infloor space, and in operating expenses.

Furthermore, the present apparatus is capable of sustained operation for long periods without clogging, requiring at the most a weekly cleaning; and'it is not dependent upon the gas-pressure to retain the proper depth of liquid in each compartment.

The apparatus also possesses other structural and operating advantages as will hereinafter appear.

vThe preferred construction is illustrated in the accompanying drawings, wherein- Figure 41 is acentral vertical sectional view, on line I-I of Fig. 2 .of an absorbing tower embodying the invention; and Fig.2 is a horizontal section thereof on line H-H of Fig. 1.

vIn said drawings, 10 represents a cylindrical steel shell, internally linedwith acidproof tile or other suitable material 11, and subdivided by horizontal partitions 12 into superposed absorbing chambers or compartments 13. Five such compartments are illustrated, but it will be understood that a larger or a smaller number may be provided according to the operating conditions. A gas-distributer 14 is arrangedin each cham- Specication of Letters Patent.

Patented Dec. 21, 1915.

Application inea May 11, 1915. serial No. 27,332.

ber. In their preferred form, thfese distributers are shallow stoneware spreaders of reven curvature, which may be of sectional construction, and have an axial connection withthe respective gas-conduits. They are preferably uniformly perforated over their entire area, as indicatedl at 15, and are likewise serrated at the periphery 16. The gasdistributers are disposed wholly below the liquid level, and slightly above 'and parallel to the partitions '12. They extend over nearly the entire'floor area of the respective compartments, leaving however an ample l,peripheral gas-channel 17, which serves as a safety-passage for the gases in case of the clogging of some or all of the.t perforations 15.

The gases enter the lowermost compart,

ment at 18, and after bubbling evenly through the entire body of liquid therein the unabsorbed gas flows through the conduit '19 to the axis of the distributer 14 in the compartment next above, and' so on upwardly, the residual gases escaping from the uppermost compartment at 21. Each conduit 19 is in the form of an inverted U, the

reiexed portion20 of whichl is located in the gas space of the compartment.

The `milk of lime is supplied continuously to the upper compartment at 22 and flows downwardly through the tower, the fully saturated bisulfate solution finally overflow-` ing from the lowermost compartment at 23. Each compartment is provided with a fixed overflow 24, located at a level between the gas-spreader 14 and the reflected portion 20 of the gas-conduit leadingthereto, and delivering into the lower portion of the compartment next below. This construction insures a suflicient depth of liquid in each compartment irrespective of any variationsin the gas-pressure.

Each compartment is fitted with a suitable level-indicator 25 (Fig. 2) and with a manhole 26 of suflicient size tio/permit removal and replacement of the sectional portions of the interior fittings. Washout openings 27, which are of course closed in normal operation, are provided in connection with each compartment.

In the preparation of bisullite solutions certain well-known difficulties are encountered. The dissolved and (suspended lime introduced at the upper portion of the tower is transformed progressively into calcium mono-sullite and calcium bisulfite, the formacium sulfate which tends to deposit in thinscales upon everything with which it comes in Contact; and the free sulfur likewise ten'ds to deposit in such manner as to obstruct all gas-passages. It will readily be understood that under these conditions it is' imperative that there should be no quiescent bodies 'of liquid inthe apparatus, as these would'perr.

mit the accumulation ofl .deposited matter, quickly clogging the tower. In case the apertures of the gas-distributers eventually become clogged a corresponding proportion of the gas escapes around the serrated periphery, thus maintaining, even under adverse condltions, a free passage for the gas' and a reasonably effective absorption of the sulfur dioxid. As above stated, the eiciency of the apparatus is such that it has been found practicable to produce calcium bisulte solutions completely saturated with uncoinbined sulfurous acid without recourse to theusual auxiliary tower or'to any equiva lent supplemental absorbing device.

I claim 1. In apparatus for preparing bisulite solutions or like purposes, a series of superposed chambers constituting a tower, an

arched gas-distributer supported in proximity to the bottom of each chamber and eX- tending nearly to the walls thereof, a reflexed gas-conduit extending from the peripheral portion of each chamber to the gasdistributer.- in the chamber next above, and an acid overfiow in each chamber located at a level intermediate the gas-distributer and the reflexed portion of the gas-conduit, and y discharging into the chamber next below.

2. In apparatus for preparing bisulite sovlutions or like purposes, a series of superposed' chambers constituting a tower, an arched gas-'distributer supported in proximity to the bottom of each chamber and extending nearly to the walls thereof, said gas-distributer having` aserrated periphery,

a reflexed gas-conduit extending from the peripheral portion of. each chamber to the gas-distributer in the chamber next above, and an acid overflow in each chamber located at a `level intermediate the gas-distributer and the reflexed portion of the gas-conduit,

`anddischarging into the chamber' next below.

3. In apparatus for preparing bisulfite sof lutions or like purposes, a series of superposed chambers constituting a tower, an arched perforated gas-distributer supported in proximity to the bottom of each chamber and extending nearly to the walls thereof, a reflexed gas-conduit extending fromv each chamber to the gas-distributer in the chamber next above, and an acid overflow in each chamber located at a level intermediatev the gas-distributer and the reflexed portion o f the gas-conduit, and discharging into the chamber next below. l

4. In apparatus for preparing bisulite solutions o'r like purposes, a series/of super.- posed chambers constituting a tower, an arched perforated gas-distributer supported l in-proximity tothe bottomv of each chamber and extending nearly to the `walls thereof, said gas-distributer having a serrated periphery, a reflexed gas-conduit extending from each chamber to the gas-distributer in the chamber next above, and an acid overflow in each chamber located at a level intermediatel the gas-distributer and the reiiexed portion of the gas-conduit, and discharging into the chamber next below. A p

In testimony whereof I aflix my signature in presence of two witnesses', v

PETER A PAULSON.

Witnesses JOSEPH SANDHOFER, M. J. SIMON. l

It is hereby certified thm; in Letters Petent'N @1,165,281 granted December 21,

1915, upon the application of Peter A. Paulson', of Appleton, Wisconsin, foren improYement in Acid-Absorbing Apparatus," errorsl appear in the printed speeica.

tion requiring correction as follows: Page 1, line 88, for the Word 'bisu'l'fate rea bisuljte; Sam-e page, line 92,for the word reectedWread rejlexel; and that the `seid Letters Patent should be read with vthese corrections therein that'the same may conform to thelrecord of the case in the' Patent Oce.

Signed and sealed this 19th day of June, A. D., 1917.

[SEAL] F. W. H. CLAY',

Acting Commissioner of Patente.

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