Патент USA US2132787код для вставки
0ct. l1, 1938. D - G. L. HocKENYos METHOD AND DEVICE FOR EFFECTING FUMIGATION vFiled April 12, 1935 ' 2,132,787 Patented Cet. l1, i938 2,132,781 'UNITEDl STATES PATENT OFFICE l 2,132,787 METHOD AND DEVICE FOR EFFECTING FUMIGATION George L. Hockenyos, Springfield, Ill., assignor to Monsanto Chemical Company, St. Louis, Mo., >a corporation of Delaware Application April 12,- y_1935, Serial N0. 15,945 2 Claims. '(Cl.-21-58) 'I'he present invention relates to fumigants for In my copending application, Ser. oNo. 758,236, exterminating such inse’ct and rodent pests as ñled December 19, 1934, is disclosed a process infest dwellings, storage rooms, ships and simi of generating sulfur dioxide by the combustion lar structures, and it has particular relation to 5 materials for the generation of sulfur dioxide for use in such capacity. _ The main objects of the invention are to pro Materials for generating sulfur dioxide for fu 10 migation purposes in which the formation of the deposit of solid sublimed sulfur -upon the sur faces of articles to be fumigated is obviated; A package for the storage and shipment of highly inflammable materials capable upon com 15 bustion of generating sulfur dioxide, which will- not permit spilling of the inñammable materials upon rupture of the container; zo A package for storage and shipment of -highly inflammable materials capable of generating sul fur dioxide upon combustion which may be em ployed as a highly efficient burner for generating the sulfur dioxide fumes during processes of fumigation. ' These and other objects will be apparent from 25 perusal of the following description and consider ation of the accompanying drawing. In the drawing Figure I is an elevational view of a package embodying the principles of the invention in actual operation. Figure II is a plan 30 view of the embodiment of the invention disclosed in Figure I disclosing the manner of opening the package. The use of sulfur dioxide as generated by the burning of elementalsulfur for purposes of de 3 Ul stroying insect and rodent pests in ships, build ings and similar structures has long been com mon practice. However, such process has never proven to be completely satisfactory for applica tion to dwellings and other structures which con tain relatively delicate furnishings. This is'true because the sulfur during the step of burning tends to sublime or otherwise give 01T fumes con taining elemental sulfur. 'I'hese fumes form whitish deposits upon the surfaces of the articles 45 to be treated which, in the case of painted and lacquered surfaces, are highly objectionable. Be cause of this defect the use of sulfur as a fumi gant has of late years been in many cases sup planted by cyanide gases which are highly effec 50 tive as destroyers of insect and rodent pests but which are extremely poisonous to higher _forms of life and are also diñicult to detect even in concentrations which may ~be deadly to.' man. Because of these defects of cyanides extreme pre cautions must be observed in using them. of carbon bisulñde. In this process the objec tionable deposition of elemental sulfur ñlms upon painted, lacquered or other delicate surfaces is entirely obviated. In the above prior application, in order to obviate the possibilities of excessively rapid combustion or of explosions, the carbon bisulñde is absorbed in a suitable material such as kieselguhr, diatomaceous earth, cotton waste, etc. which permits the. inflammable vapors to escape gradually and obviates violent combus tion. The present invention involves the provision of a package for the materials disclosed in my copending application which is highly efhcient in retaining the carbon bisulñde during storage or shipment, which package also is susceptible of acting as a highly efûcient burner for the carbon v bisulñde vmateria-l. Broadly stated, the invention comprises the provision of a package of carbon bisulñde _ab sorbed in a suitable material and hermetically sealed in a metallic container of such character that it may be readily opened at the top and provided with punctures adjacent to the bottom which permit the carbon bisulfide to ignite and the names to play upwardly along the side of the container in order to heat the contents and thus completely to expel the carbon bisulñde in vapor phase.` In the form of the invention disclosed the car bon bisulñde is admixed with any convenient ab sorbent. Kieselguhr is found to be quite satis factory for this purpose. Approximately three fourths of a pound of kieselguhr will contain approximately three pounds of carbon bisulñde Without any tendency of the liquid to now there from upon opening of the container in which the material is packed. This mixture of carbon bisulñde and kieselguhr is incorporated into an ordinary tin can t of thevtype of a tomato can of convenient size, and having a bottom 5 soldered thereupon. >A can of approximately one quart capacity is found to be quite convenient for most purposes though, of course, larger or smaller cans may be employed if desired. It is to be under-l stood that the can is to be formed of sheet metal (e. g. mild steel) of adequate thickness and rigid ity to prevent accidental rupture of the can dur ing ordinary usage. However, it should be suf iìclently thin to> admit of opening and slitting the sides of the package by means .of an ordinary knife or other convenient instrumentality. It 2,132,787 2 the cans containing lt may readily be sealed in ventional manner. If desired, the points for the formation of the vertical slits may further be marked by small indentations in the walls of the container. ordinary manner merely by securing a. cover 6 by this form of the invention the burning of carbon a conventional crimpseal 1. Packages of fumigant as thus prepared are her metically sealed and, of course, may be stored `for bisulñde vapors emitted through the openings cut an indefinite period of time without any loss due pletely vaporized thereby insuring that the mate-' 10 rial will be'f'burned within the shortest possible is found that when carbon bisulñde is stored in kieselguhr or other suitable absorbents in ac cordance with the provisions of this invention, 10 to evaporation of the contents orwithout any ñre hazard. The cans will withstand internal pres sures generated even when the cans are heated up to 150° F., and even if they are heated up to It will be appreciated that in the operation of in the sides of the cans insures that the contents of the bottom of the can will be rapidly and com period of time commensurate with safety. This - is highly desirable because if the material burns the point of rupture, there is no serious explosion. If in handling the packages the tin containers should accidentally be ruptured, which occur rence is improbable, there is but little fire hazard over an unduly long period of time there is con siderable accidental loss of the sulfur dioxide from the space to be fumigated before the combustion is complete. Therefore, the sulfur dioxide never involved because the absorbent retains the liquid and prevents it from spilling. >The escape of the carbon bisuliide as a >vapor 'from the ruptured container is so slow that in any reasonably well ventilated place of storage the concentration of vapors cannot become 'suiïlciently high to be - attains the maximum possible concentration and the fumigating action is never'as intense as it is where the concentration of Ysulfur dioxide is brought immediately to its highest value. It will thus be apparent that I have provided a relatively inexpensive package for the preserva 20 tion and use of carbon bisulñde as a fumigant dangerous. which may be handled and stored with safety over When it is desired‘to employ the material for » long periods of time and which acts as a highly generating sulfur dioxide, as well as the at eñicient burner for carbon bisulñde during fumi tendant CO: which also results from the burning gationoperations. *_ _ ' of CS2, for fumigation purposes the container, Although lI have shown and described only the may be opened at the top, for exampleby forming preferred forms pf the invention it will be ,ap- 30 30 cross slits 8 in the top 6.. It is not necessary to parent that numerous modifications~ may be pry the naps or tabs 9 thus formed upwardly but vmade therein without departure from the spirit instead they may be left in position allowing the of- the invention or the scope of the appended carbon bisulñde vapors merely to escape through the slits. By this method excessively rapid com What I claim is; '35. bustion of the carbon Abisuliide over a relatively l. A method of burning carbon blsuliide to 25 claims. ' large zone at the top of the can upon opening - yform sulfur dioxide in the latter is obviated. Adjacent 'to the bottom of the can a plurality . fumigation operations which comprises puncturing the top and lower side' wall portions of a sealed non-combustible of openings are pierced and they may take the vessel containing carbon bisulfide absorbed in a form of vertical slits Il as shown in the draw y» porous material and igniting the carbon bisul?de ing. Slits of this character are found in actual vapors issuing from the ports formed by said practice to be preferable to round openings or to puncturing while allowing the names issuing from transverse slits because they permit the carbon the lower side wall ports to play upwardly along bisulilde vapors to flow upwardly- along the ver-. the vessel to evaporate completely the carbon tical surfaces of the container rather than beingv bisulñde in the upper part of the container. projected horizontally to a distance from the lat 2. An apparatus for the generation of a fumi ter. By thus ñowing along the surfaces the .gating gas containing SO: from CS2 absorbed in a vapors, upon ignition, more effectively warm the porous refractory material contained therein and contents of the cans than is possible where they illling it, comprising a normally hermetically’ 50 gare projected horizontally. 'I‘he container may, of course, be providediwith a suitable paper wrapper having trade-marks, instructions and such similar matter printed thereupon. It is also desirable to print upon the label marks indicating 55 the position inwhich the vertical slits are to be formed. These marks may also be identliied by such' labels I1 as “Slit here” or other similar in structions. It will also be appreciated that in stead of providing the containers h separate paper wrappers they may be lithographed in con sealed sheet metal container with slits formed in the top thereof and slits formed along the side walls adjacent the bottom thereof, said slits ad jacent the bottom being >adapted for ignition of 'CS2 vapors in order to heat the contents oi the container above said slits along the side walls, and thus to vaporize CS: from said porous mate rial for combustion at the top of said container. GEORGE L. HOCKENYOS.