US870915A - Process of manufacturing arsenic compounds of lead. - Google Patents

Description

PATENTED NOV. 12, 1907.

' 0. D. VREELAND. 7

PROCESS OF MANUFACTURING ARSENIG COMPOUNDS 0P LEAD.

APPLICATION FILED FEB. 5, 1906.

was.

STATES ATE'ngr'bFFI- .1 CORNELIUS n. vnnnmun, or MONTCLAIR, NEW-JERSEY;

PR C SS OF nsmhccrnnme ARSENIC oomrormnsos :ILEAD.

To all whom it may comm; i

Be it known that I, Corrsnmus D, VRnnnA'nn, a citi-- V zen of the United States, residing in the town of'Montessary in the processes now used ior:this'purpose. As

the art is now practiced, these compounds' are'manw' factured by dissolving leador an oxid thereoiin nitric or acetic acid, precipitating the dissolved lead by an arsenic compound, recovering the prcipitate, reeovering the by-product, etc., evaporation and crystallization usually being necessaryQ' i 5 My invention consists in the production by ele'ctrolysis of a soluble salt of lead in the presence of a soluble compound of arsenic and its'immediate precipita- "tating the lead salt thus formed by means of a solublev tion by the latter as an arsenic compound of lead.'

My invention is practiced by immersing a mass of, lead orof a suitable compoundthereoi in a solutionofan electrolyte which, under the influence ofan electric current, will produce a solvent oflead, passing a, current of electricity through the solution and precipi compound of arsenic.

My process can be carried out with appaxatusof a variety of types and a number-oidifierentreagents maybe used interchangeably. u

The accompanying drawings-illustratemne, of the types of apparatus referred to in which drawings 'Figure 1 is a sectional elevation and Fig. 2 is a sectional elevation at right angles-to that sliown in Fig. 1 on the line X-X thereof.

In these drawings is shown a v shaped tank having walls F, F'maintained by supports G, G. This tank forms or constitutes an anode compartment A, A in which is inserted the anode or series of anodes C, 0 connected electrically at D m the bus-bar. H. The anode or series of anodesmay be suspended or may rest upon the walls of thetanli, as shown. Alternately dis posed between said series of anodes are theseiis of porouscathode compartments B, resting upon the in-.

- (-liucd walls F, F of the tank. In each cathode com ,partment is suspended a cathode B electrically connected at E to-the other commonconductor E con .ductors H andE being connected to a source of clec-' trical energy not shown.

In the type-of apparatusillustrated as that .with which I practice my invention at present, I employ a Application filed February-5.1906. Serial No. 299,434.

cell or tank divided as shown into a series of anode and r I Specif cation of Letters Iatenti Patented Nov. 12 1907.

"cathode compartments. Each cathode compartment I consists of a porous receptacle-which is filled with a solution of sodiumhydroxid of sin le strength,'and a cathode is immersed therein consisting of a plate of iron. The anode compartmentis filled'with an aquc-' ous solution of sodium nitrate and the anode immersed tion the sodium nitrate is split up by electrolysis .and the nitric acid radical unites with the lead, forming soluble lead nitrate, while the sodium passes-into the porous cup. Into this anode compartment I introduce a solution of a sodium salt of arsenic, for example, so .dium arsenate, which reacts uponthelead salt to produce load arsenate andsodium nitrate. The former,

'therein consists of aplate or cylinder of metallic lead; 4 -When the electric current is passed through the solu-" being a heavy insoluble substance, is precipitatedout of the solution and settles to the bottom of the vessel,

whence it'can be drawn off in any suitable'manner. The soluble sodium nitrate thuslormedis in conditionto' be once moreelectrolyzed, as before.

into the compartment contiriuously'in just the-proper quantity to react upon the leadnitrate formed, and as this latter action can be quantitatively dete'rmined',

regulated: As l have stated; I prefer to introduce the arsenic salt directly into the anode compartment of the cell, but if desired the lead nitrate formed as the result of the electrolysismay be drawn off into another reoep- -tacle, the lead salt of arsenic precipitated there, and

I find it preferable tointroduce the arsenic solution theflo'w'of the arsenic compound can be accurately the sodium"nitrate of the reaction returned to the.

anode compartment. The former method, however, will be found preferable, as he action is practically continuous. It may befound desirable from time to time to draw oft a portion of the solution inside the cathode compartment and to :add water in order to maintain the 'proper degree of concentration. I u

I do not wish to be understood as limiting myself to the particular materials which-I have enumerated, but desire to claim'bro'adly 'the process, irrespectiveoi the particular chemical substances used, which, as will readily be .understood, 1 can be varied considerably without departing from the spirit of my invention: for example, for the cathode at present I use an iron plate 1 merely bedause it is inexpensive and very littleafi'ected by the action, although other substances, such as carbon, could, of course, be used .without essentially altering the process. Again, the anode may consist ofamass of an oxid of lead instead of the lead plate.

or potassium, or.certain other compounds, theessen- I The electrolyte may be the nitrate or acetate of sodium tial requirement being'that it shall be ail electrolyte which under the influence of the electric current will separate into a solvent of lead. The arsenic salt used may be sodium arsenate or sodium arsenite, orapotassium' salt of arsenic,-or some other soluble arsenic comoaasna'wa comhine with 'thesoluble 1a 1- -sa1 to produce an insoluble lead compound of arsenic? As,. for example, a solutio'n of arsenic acidwwhich re-acts uponvthe l eadrsaltto' producelead arsenate ahd nitric .acid-Q-lThel nitric acid thus iormed neutralizes the sodium hydroxi d which diffuses iromfthe cathode comarrmem, forming sodium nitrate, "which is e1ectro'- yz'ed'as before. a I find-that it aids the action ofthe cell toiprovide some-means for agitating the contents ofthe anode,

chamber inforder to pre'vent any deleterious deposit being formed upon the anode; This, beaccomany of the means commonly employed'to 3 1. effect sucha result. .15

fIn-order to prevent the'possihle formation of undesirable basic salts, I prefer'tomainta'in the electrolyte in a slightly acid condition.

Having described my invention,what I clai misr 1. The process'of manufzrturing arsenlcco'm'p'ounds of lead which consists ortheformatlon of'a soluble salt 01! lead by electrolysis in the presence of a soluble compound thereby as an arsenic compound of lead.

2. The process of manufacturing ars'enlc'compounds or Vleadwhlch consists in placing a body 01 metallic lead in a solution or adelectrolyte which undertlre influence or of arsenic and the simultaneous precipltation'ot the lead "the electric current will separate into a solvent of lead attire anode and dissolve the leada theretrom and i!i pre cipltatlng the leadthusbrought into solutlonwlth a soluble compound of arsenic.

3. The process of manufacturlng arsenic' compounds of lead which consists in immersing a suitable cathode in a solution of an alkaline hydroxid contained within a porous receptacle, immersing said porous receptacle in a vessel containinga solution of an electrolyte which under the influence o1! thelelectrlccurrent will separate into a solvennof lead, immersing in said electrolyte an anode consisting of a body of lead or of a compound thereof, pass- ;lng ancictric current through the circuit, and introducing into the anodecompartment a soluble compound 01' arsenic.

4; The electrolytlc .process of manufacturing arsenic "salts of lead which consists in immersing the cathode in afsolution of an alkallnehydroxld contained in a porous receptacle, immersing said porous receptacle in a vessel .'containing an;anode or lead or of a. compound thereof and an electrolyte which under the influence ot the electric current will separate into a solvent 0!? lead, and introducing into said anode compartment a solutionv ota" compound of arsenic. T 5. The process or manufacturing arsenic compounds of lead which consists in immersing a mass of iron in a solutlon or an alkaline hydroiiid contained-in a porous re;

,6.- The process of manufacturing arsenic compounds of. lead whlclrconsists in immersing a cathode of ironin a solution of an alkaline hydroxid contained lira porous receptacle.immersing, said porous receptacle in a vessel containing an anode of lead. and a solution of n sait which when electrolyzed will produce a solvent ot lead,

passing a current ot electrlclty through the circul't'iind precipitating the leadsait thus formed by meo'iisof a soluble compound of arsenic. i v

-. 7. The processor manufacturlng'arsenic compounds of lead which consists in immersing a cathode of iron in a solution of an; alkalinehydroxid contalned.in 'a porous receptacle, immersing said porous receptacle in a vessel containing an anode otiead and an electrolyte which under the influence of the current will separate into a solvent oi lead;passing a current of electricity through the meansot a soluble salt of arsenic.

8. The process of manufacturing arsenic compounds of lead which consists in immersing a cathode-of iron in a solution of an alkaline hydroxld contained in a porous receptacle, immersing said porous receptacle in a vessel containing an anode ot lead and a. solution or a salt which when electrolyzed will produce a solvent of lead, passing a current of electricity through the circuit, and'pre cipitating the lead salt thus formed by means oi. a soluble salt 0! arsenic; a

- CORNELIUS D. VREELAND.

circuit, and precipitating the lead. salt thus tormed by

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