US7399A - charles payne - Google Patents

Description

UNITED STATES PATEN me onus. PAYNE, or SOUTHLAMBETH, ENGLAND.

IMPROVEMENT IN PROCESSES FOR PRESERVING wooD.

Specification. forming part of Letters Patent No. 7,399, dated May 29, 1850.

To all whom tibia concern:

Be ,it known-that'I, CHARLES PAYNE, of

South Lambeth, in th'ecounty of Surrey, chemist, asubjeet of the Queen or Great Britain, haveinvented or discovered new and useful Improvements in Preserving Vegetable" Mat;- I ters; and I ,the said OHnRLEs PAYNE, do here-' by declare that my invention relates to a mode ofpreserving vegetable matter bycausihg them to be impregnated with solutionsof metallic or earthy matters, and then by chemical deoonp position to;obtain-the-preserving matters employed: in'an insoluble state within .the sub- 'st'ance of' the vegetable matter treated when such effects are obtained by the combined pr 0'-.

ceases of exhaustion, pressure, and; chemical decomposition.

" Inorderthat-my invention may be fully un 'derstood and readily carried into effect, I will proceed to explain the means pursued by me, jiirst remarking that there are many metallic and earthy matters which-are known as pre servatives:ofregetable matters from decay or fromcombustion by flame; It is not therefore my: intention to entcrinto' a particular description ;thereof,-my*-invention relating to a mode ofapp'lying such matters-as abovestated, and

' not totheuse or'application of such preservative matters generally.

I will therefore-com finefmy explanation to the. use of one metallic solution and .one earthy matter in solution, to-

gether with the use ofsu-itablematters in solution, for decomposing the metallic or earthy 'matte'rsused. The wood or other-vegetable matter to be preserved is placed in' a strong vessel capableof bearing considerable pressure and of a size dependin g on the dimepsionsor quantity of the vegetable matters to be preserved at onetime,

and as good a vacuum is to be obtained impossible, either by air-pumps or otherwise, as is well understood, by which the air will be exhaust-ed from thefibers of the vegetable matter.

1 next fi'l-l'the vessel with the earthy or metallic solution I propose to use and allow the liquid to stand for a short'tim-e, or I nearly fill the the solution of iron.

time to'time, keeping up the pressure of'supply by-which the process will befacilitated; and when the vegetable matter is well impregnated with the metallic or earthy solution-the time for doing which will vary'with the nature and quantity and on the dimensionsof the pieces of the vegetable matterstreated; but the workman-with a little practice-will soon judgeot'fthe time required-and having'saturated the vegetable matter in the vessel, I withdraw the liquor from the vessel and fill it with a solutionsuitable for decomposingthe matter of the previous liquor by double or single de-i composition, according to the result'deslred to be obtained, all which-is well understood by chemists and will not bereqnired to be de- -scribed in this my specification. Supposing the solution to be used to be a strong solution of sulphateot' iron either hot or cold, having impregnated the wood or other vegetable matter therewith, I apply a solution of any of the carbonated alkalies to'decompose I prefer carbonate of soda for that purpose; but any suitable known substances which will decompose. the salt and render-the oxide ofiron insoluble may be resorted to, and. by means of vacuumtand pressabling us to. fac'ilitatethe next process of impregnation and decomposition by exhaustion and pressure, as above explained. -'In' this man- In respect to earthy matters, supposing a .strong solution of alum tobe used, I employ a solution of carbonateof soda ot a strength proper for the solution ofalnm; or GlhGl proper and well-known means 01" uecompesuion of the solution of alum may be resorted to for on or other vegetable cipit-ating the alumina, and thus rendering it ins luble in the substance of the wood orother vegetable matter treated, and in this manner may solutions of lime and other earthy matters be employed, using suitable decomposing substances in solution. I

v I am aware that wood and other vegetable matters have been before impregnated with various metallic and earthy matters; etiid I am also aware that it has been before proposed to use exhaustion and pressure to impregnate Wood and otherm'atters withpreservative s'olntions,'and I mention these in order to state that I do not claim the same. when separately 1 considered or when uncombined with a process of decomposition as above described; and I am also aware that chemical matters have been obtained in an insoluble state in the wood; but this has been etl'ectedlsimply by the process of absorption and immersion, thewood being sue cessively soaked in the materials employed.

This latter-mode is not only slow, but .very nn-' nating wood and other vegetable matters with the sulphur; andin order more readily and effectively to cause such matters to enter-wood or other vegetable matters, I'canse the said wood or vegetable matter to he placed in suitable vessels, which may be exhausted of air, and afterward have the liquor containing sulphur pumped or forced in and act with considerable pressure, as is now extensively practiced and well understood when using other preservative materials. I employ any conyenient sulphuret which is soluble in water, as the. sulphuret of potassium, of sodium, or strontinm; but I prefer snlphurct of barium or of calcium. 3

If I employ a solution of sulphuret of barium, I-prepare it as follows; I mix together at the rate of sixteen pounds of powdered sulphate of barytes and from one to two or more pounds of powdered charcoal or coke, and I subject this mixtureto the action of a strong red or to a white heat in a 'reverberatory furnace for about an hour. The sulphuret of ba- 'rium thus obtained I dissolve in water by stirm' ng small portions at a time into boiling water till the water ceases to dissolve'it. The solution is afterward allowed to cool, and when cold water is added till the specific gravity is about 1.040. Thiss'olntion is to be preserved for use out of contact of the air.

.The wood or other veg'etable matter to be impregnated isto be placed in a vessel, as above Lexplaiued, and the air removed, which I prefer to do by first filling, the vessel with steam and condensing it by injecting a portion of the solution' to beemployed into the vessel, and at the same time using jets of cold water externally. When a partial vacunmhas been thus obtainedI allow the solution to flow into the vessel, and I employ'air-pumps to obtain as good a vacuum as possible, and then I pump in more of the solutiouand bring the pressure in the vessel from one hundred and ten to one hundred and forty pounds on the square inch, andallow the same to remainforabout an hour,

when the remaining liquor is drawn ofi. Thisbeing eflected, I again obtain a-v'acnum and force in a second liquorin order to produce a single or double decomposition between it and I that which has been previously forced into the wood orother vegetable matter; and the liquor I prefer to use for such purpose whenfor-obtaining-a double decomposition is a solution of sulphate of iron in water, and I prepare the solution to contain about one pound six ounces of the sulphate to each gallon of the-solution. Other materials may be used for prod uciug either double or single decomposition, as is well understood by chemists, the object of the invention being to obtain sulphur within the wood or other vegetable matter, and t'o'cause it'to remaiu therein either in the state of precipitated sulphur or sulphur in a state of combination with other matters, and so thatwhen .the sulphur has beencauscd to enter the wood it'shall be rendered or become insoluble in waterand not capable of being washed out thereby. Therefore I wish it to be understood that, although I have only described sulphuret of barium-and the sulphuret of iron, I do not confine myself thereto;- but I have given them as an example, they being, I believe, the best when cost and other circumstances are taken into consideration. Therefore What I claim as my invention or improve ment is The combination of the processes of immcr sion, absorption, exhaustion, pressure, and'decomposition, substantially in the manner and for the purpose as hereinbefore explained.

' CHAS. PAYNE.

Witnesses:

JOHN ALcocK, Lz'izcolns Inn, London.

csEPn MARQU'ETTE, Clerk in the Consulate U. States, London.