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Патент USA US2132787

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0ct. l1, 1938.
- G. L. HocKENYos
vFiled April 12, 1935
' 2,132,787
Patented Cet. l1, i938
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;
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
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
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
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
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
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
tion and use of carbon bisulñde as a fumigant
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
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.
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