Patented Got. 23, 1934
f uirizo sir
__
; PATENT I o-rrrca
‘ 1,978,040‘
‘ PROCESS FOR} MAINTAINING! THE SPRIN
KLING CAPABIIJETY 0E- FINELY- GRANU-'
LAR' TABLE ; SALT
' Werner Daitz, Lulieck; Germany," assignor' to ?rim'
Daitz Patents‘ 7 Foundation‘ Binningen (Easel) -
New-York, Binningen; near Basel, Switzerland "
No Drawing. Application April 25, 1933, Serial
No. 667,933. In Germ any September 14, 1931:
4 Claims. (01. 234/243‘)_
r 1
It is ‘well known that ?ne table salt cakes to‘ dium chloridemother liquor with respect" to- p0‘
géther more‘or less during storage to form small - tassium' chloride 'sdth‘at at‘ a suitable‘ concen
or large lumps and as a result loses its satisfac
tory sprinkling capability. The generally accept
tratio'n'and a corresponding» temperature, bearing
in mind the'solubility ratios of‘sodium chloride
0 ‘ed reason for this is the foreign salts present in and potassiuml chloride, thevtable salt is sepa
thetable-salt, more particularly soluble calcium rated-out in ?nely granular form‘ With‘ the de
and magnesium salts. It has not'been possible, sired potassium chloride content. This process
however, to make a ?ne table salt of permanent yields the best ?nely granular? table saltof good
satisfactory'sprinkling capability by. diminishing permanent? sprinkling capability.
10. the quantity of-foreign salts in the same. For this
reason- in order to avoid caking together pul
verulent substancesof various kinds have been
adde'd'lto the ?ne table salt, more particularly
Alternatively
the procedure may be. such that the necessary
quantity of comminuted potassium chloride is
added-to the ?nely gran'ular'still moist salt, ob
tained in'theusual-way after separating the main
substances which are insoluble in water, such as ' portion of‘th‘e mother liquor in the production of
15 rice ?our, arti?cial magnesium silicate, ?nely cookingsalt, e. g. when'ic'entrifuging' the ‘salt in 70
crystallinelsilicic acid, natural or arti?cial amor known centrifuges or?when working ‘up with ‘other
phous silicic acid or the like. When these addi
devices such'l-asi drying- drums,‘ shaking troughs,
tions are made, however, the table salt yields sieve devices or the like.
turbid solutions when mixed with water and for
In the manufacture of ?nely granular table
20 this reason such additions are to be regarded as salt from rock salt operations are preferably car
of very little value.
ried out such that the potassium chloride is added
According to the present invention an addition
is made to the table salt, that is to say, both
crystalline high-percentage cooking or common
25‘salt as well as ground rock salt, which does not
impair the solubility of the salt. This addition
consists of ?nely granular potassium chloride
to the rock salt during the grinding or sieving
process.
The action of the addition may be en
hanced by adding the potassium chloride to the
?nely ground rock salt in the form of a concen
trated solution before the drying operation.
Further experiments have shown that the ac
which may be added to the table salt in varying tion of the potassium chloride addition to the
quantities, according as to what has been found ?nely granular table salt can be still further
30preferable from preliminary experiments, either raised, or alternatively the potassium chloride ad
during the production of the table salt or else to
the ?nished ?nely granular salt. In many cases
a mixture ratio of 2-3 parts of potassium chlo
ride to 100 parts of ?nely granular table salt is
dition can be diminished without impairing the
effect, by adding salts of phosphoric acid which
are partially or wholly freed from water of crys
tallization at the same time. More particularly
3.5‘su?icient to maintain the satisfactory sprinkling anhydrous disodium phosphate comes into ques
properties of the salt for a long time. If the
quantity of potassium chloride added is dimin
ished then its eiiect in maintaining the sprin
kling capability of the table salt is very rapidly
tion in this connection.
No perceptible cloudi
ness occurs on dissolving table salt to which ad
ditions of such salts of phosphoric acid have been
made. Addition of 0.3 to 1.5 parts of the phos
40vdecreased. Generally speaking the potassium phate to 100 parts of the table salt are usually
chloride content is adjusted to 5-7 parts in 100 su?icient. Such a mixture of sodium chloride
parts of ?nely granular table salt. If the potas with a moderate content of potassium chloride
sium chloride content is raised above this pro and anhydrous disodium phosphate, not only
portion then an increased effect is not obtained offers the advantage that the satisfatcory sprin
'45 whilst on the other hand the taste of the salt is kling capabilities of the ?nely granular table salt -*
unfavorably a?ected.
The prominence of the taste of the potassium are better maintained, but the salt, in comparison
chloride in the mixture could be diminished by to the table salts of the usual composition, also
adding besides potassium chloride in addition has the advantage that it contributes more to
50 very small quantities of sodium iodide or potas an improvement in the composition of the blood
sium iodide, to the extent of about 7 milligrammes than the usual table salts. The improved biologi
cal suitability of the table salt is secured to an
per 1000 grammes of table salt mixture.
When using common or cooking salt for mak increased extent if in addition small quantities of
ing the table salt the mixing with potassium anhydrous di-magnesium phosphate MgHPO4
55 chloride may be carried out by enriching the so and dry di-calcium phosphate Cal-IP04 are added, u
1,978,040
2
the proportionbeing about 0.1 to 0.2 parts per 100 however, it is a question of combining a sodium
chloride which in itself is truly ?nely granular,
parts of ?nely granular table salt.
such as is obtained as cooking salt or from rock
Examples
salt, with those quantities of the said additions
which better maintain the satisfactory sprin 80
1. 100 kg. of sodium chloride are withdrawn kling capability of the ?nely granular table salt.
from the vacuum evaporator with a moisture con
15
For this purpose the said additions have never
tent of about 30%, introduced into the drying been used, that is to say, neither potassium chlo
centrifuge, and mixed with 6 kg. of potassium ,.
ride-nor the combination of potassium chloride
chloride which is subdivided as ?nely as possible‘ with the said anhydrous phosphates.
85
and has the same moisture content. The mix
I claim:_
ture is then centrifuged in the usual way, dried,
1. vA process for maintaining satisfactory
ground and sieved. In this way an intimate mix sprinkling e?iciency of ?ne granular table salt,
ture of the potassium chloride with the sodium which consists in adding between 2% and 10% of
chloride takes plate during the whole manufac potassium chloride to ?ne granular table salt
turing process, i. e. from the centrifuge up to the
packing.
1
made from cooking or rock salt.
2. A process in accordance with claim 1 in
which an addition is made to the ?ne granular
2. About 10 litres of a saturated solution‘pre
pared at 100° C. of about 560 parts of potassium table salt together with the potassium chloride,
chloride in 1000 parts of water are added to each of an anhydrous phosphate of an element select
95
100 kg. of preliminarily ground rock salt in a heat ed from the group consisting of alkali, calcium
able stirring apparatus and the salt is further and magnesium, and more particularly di-sodium
worked up in the usual manner after drying. In
this way, as in the working up of the cooking salt phosphate.
3. Table salt maintaining satisfactory sprin
according to Example 1, an intimate and uniform , kling efliciency, consisting of ?ne granular cook
100
admixture of the potassum chloride and sodium ing or rock salt with an addition of between 2%
chloride is obtained, the ratio between these salts
10% of potassium chloride.
being about 6 parts of potassium chloride to, 94 and
4. Table salt maintaining satisfactory sprin
parts of sodium chloride.
'
kling ef?ciency, consisting of ?ne granular cook
3. A table salt is made from cooking salt in the
ing or rock salt with an addition of between 2% 105
manner described in Example 1, which contains and 10% of potassium chloride, with an addition
2-3 parts of potassium chloride per 100 parts. of a small quantity of anhydrous phosphate of
After manufacture this salt is admixed with an an element selected from a group consisting of
hydrous disodium phosphate in the ratio of 200 alkali, calcium, and more particularly di-sodium
parts of the salt to one part of the phosphate.
‘
It is well known that considerable quantities of
other salts, even some potassium chloride, may
phosphate.
WERNER DAITZ.
110
be contained in impure sodium chloride. Here,
40
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50
125
130
135
140
70
75
145