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Патент USA US2130805

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2,130,805
Patented Sept. 20, 19738
UNITED STATES PATENT ,_ OFFICE
2,130,805
STERILIZING AGENT
‘Arthur A. Levine,
Niagara Falls,.N. Y., assignor ' Y
to E. I. du Pont de Nemours a Company, Wil
mington, DeL, a corporation of Delaware
No Drawing; Application February 26, 1936,
Serial No. 65,919
2 Claims. (Cl. 210-28)
This invention relates to a process of sterilizing. active chlorine and will give up substantially all
of its chlorine content. As is apparent from the
More particularly it relates to a process of ster
formula, the chlorine content is approximately
ilizing or disinfecting any liquid or mixture con
36.5%.
taining bacteria. - It is especially useful in the
5 treatment of water in order to render potable an
As illustrative of the effect of 1,3—dichlor 5,5
dimethylhydantoin in sterilizing river water con
impure water of high bacterial content.
taining large amounts of bacteria,.the following
This invention is concerned with the use, in
tabular summaries may be given. In each case
two samples of river water were treated, one
sterilizing, of the compound 1,3-dichlor 5,5-di
methylhydantoin. This compound is a white,
10 crystalline powder which has a strong odor of
sample being un?ltered/ and the other ?ltered
through an ordinary sand ?lter. In the results
hypochlorous acid. Its melting point is approxi
summarized in Table I sufficient dichlordimethyl
hydantoin was added to give various chlorine
concentrations ranging from 5 to 30 parts per
million, one sample of each kind of water, ?ltered
mately 117° C. It is relatively soluble in water‘
and other liquids. structurally, it maybe repre
15 sented by the following formula:
v
5
and un?ltered, being kept untreated as a control.
Two samples of each chlorine content were pre
pared, one being examined for bacterial content
at the end of six hours and the other at the end
20
of twenty-four hours. As will be apparent from
the following table 1,3-dichlor-5,5-dimethylhy
dantoin acts as an effective sterilizing and disin~
When using 1,3-dichior 5,5-dimethylhydantoin
fecting agent.
'
as a sterilizing agent, this compound is added to
TABLE I
I
v
_
25 the liquid to be sterilized in sumcient amount to
dichlordimethylhydantoin
Bactericidal tests with
25
for sterilizing un?ltered and screen ?ltered
river water
>
30
30
Parts per Chlorine eon- Bacterial
Water sample million
tent after 6 content per
treated
chlorine
hrs., parts
0. c. after 6
added
35
Un?ltered:
1 ________ ..
hrs.
lion
hrs.
35
0. 0
0. 0
36, 500
__________________________ ._
0. 0
__________________________ -_
5
5
3-4
50 __________________________ _.
__________________________ ._
3-4
50
10
10
7-9
15 __________________________ __
__________________________ ._
5-7
10
‘ 20
40
per million
Chlorine con- Bacterial
tent after 24 content per
hrs., per mil- 0. c., after 24
16-17
82
0. 0
34, 800
__________________________ __
2o
__________________________ _-
30
30
25-30
89 __________________________ __
__________________________ __
20-25
83
14-16
70
40
0.0
0.0
41. 000 __________________________ __
0. 0 __________________________ ._
0.0
39, 250
g
5
85 ________ "5:4 _____________ __
.......................... ..
45
10
l0
20
20
30
30
8-10
65
45
50 __________________________ __
.......................... _.
6-8
44
18-20
65 __________________________ _.
__________________________ __
18-20
60
20-25
74 __________________________ __
__________________________ _.
18-20
60
50
50
provide any desired active chlorine concentration.
As will beapparent from the chemical structure
of the compound, the chlorine atoms ‘attached’
to the nitrogen atoms in the ring are readily re
55 moved. The compound is therefore a source of
For the purpose of investigating the effects of
greater chlorine content a second series of sam
ples were tested, the procedure being exactly the
same as in the experiments summarized in the
foregoing table. In this case, however, somewhat 55
2
2,130,805
larger amounts of dichlordimethylhydantoin were
added, the amount being su?lcient to give chlorine
contents ranging from 0 to 500 parts per million.
These results are summarized in the following
table:
10
wherever any liquid or in fact any other material
is to be sterilized. Thus, it is equally useful in the
sterilizing of liquids such as milk, cream and in
the sterilizing of solids such as butter or ice cream.
My sterilizing compound 1,3-dichlor- 5,5-di
TABLE II
Parts per Chlorine con- Bacterial
Chlorine con- Bacterial
Water sample million tent after 24 content per tent after 48 content per
treated
chlorine hrs., parts c. c. alter 24 hrs., per mil- 0. c., after 48
added
per million
hrs.
lion
hrs.
10
Un?ltered:
1-________ _-
0.0
0.0
60, 000
__________________________ ._
0. 0 .......................... _-
15
50,125
40-45
10 __________________________ ._
.......................... _38-40
5
100
100
80-90
85 __________________________ .
__________________________ ._
76-80
25
200
20
0. 0
50
50
200
500
500
150-155
85
__________________________ _ _
__________________________ _100-125
6
400-460
15 __________________________ __________________________ __
350-400
0
0.0
0. 0
51,200 __________________________ .
0. 0 __________________________ ._
0.0 Uncountable.
50
50
100
100
25
200
200
500
500
20
45-50
70 __________________________ __
__________________________ __
40-45
20
85-90
20 __________________________ -_
__________________________ _.
80-85
0
150-175
30
________ -l ________________ __
__________________________ __
100-150
45
450-460
5 __________________________ __
__________________________ _375-400
75
25
In determining bacterial content per 0. c. in the
30 experiments incorporated in the foregoing tables
methylhydantoin is a relatively stable solid ma
the standard bacteriological procedure was used. terial which ‘readily yields up all of its chlorine 30
content when’ applied to a material capable of
Samples of the treated and untreated water were taking
up that chlorine.
plated, using a nutrient agar-agar plate, and the
This
invention
is not to be regarded as restrict
bacteria were allowed to develop for 48 hours.
ed to any speci?c sterilizing use nor is it to be re
35 At the end of that time the bacterial colonies were ’garded as limited except as necessitated by the
counted under a low-power microscope and the appended claims.
number of colonies was assumed to represent the
number of bacteria present at the time of plating.
This is in accordance with the standard bac
~
1. A process of sterilizing water which com
teriological method for determining bacterial
prises treating said water at substantially room
content and, as usual with those methods, gave
results which were somewhat variable. However,
dantoin.
from the foregoing tables the sterilizing effect of
1,3-dichlor 5,5-dimethylhydantoin is plainly ap
45
I claim:
parent.
My invention is to be understood as applicable
temperature with 1,3-dichlor 5,5-dimethylhy
40
2. A process of sterilizing water which com
prises treating said water at substantially room
temperature with dichior dimethyl hydantoin.
ARTHUR A. LEVINE.
45
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