Chemistry: physical processes – Physical processes – Crystallization
Patent
1979-10-24
1982-06-15
Clements, Gregory N.
Chemistry: physical processes
Physical processes
Crystallization
23300, 159 1S, 159 16R, 159DIG28, 203 10, 426649, C01D 306
Patent
active
043348866
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention concerns a method of manufacturing table salt containing a sufficient amount of minerals from the sea water using natural energy.
DESCRIPTION OF THE PRIOR ART
A typical method of manufacturing table salt as conventionally handled up to now is the ion-exchange membrane method. By this ion-exchange membrane method, sodium ions (positive ions) and chlorine ions (negative ions) of sea water are collected between ion-exchange membranes by means of electrophoresis and ion dialysis to produce concentrated salt water, which is then evaporated in a vacuum evaporating can and thus concentrated into table salt. This method is the so-called electrochemical method which separates pure NaCl from sea water. Therefore, 99.5% of the salt is composed of NaCl. Less than 0.5% consists of minerals such as Mg and Ca, which salt contains in large quantity when produced by the ancient solar method.
Those minerals are essential and indispensable to maintain human life. However, as we have just pointed out, the highly purified table salt contains almost no such minerals, and considerable concern and worry have arisen that long-term use of such purified table salt may destroy the balance of minerals in the human body and thus cause health problems. The basis of this concern is that the blood, body fluids or amniotic water in the human body contain such elements as Na, Mg, K, Ca or Cl at almost the same rate as sea water, and that it has been medically proven, for example, by Ringer's solution that those mineral elements and their content rates are very closely related with the maintenance and survival of life.
Two other problems of modern life are caused in part by the conventional method for manufacturing table salt. Firstly, concentrated sulfuric acid is used to increase conductivity conductance in the ion-exchange membrane method and hydrochloric acid is also used to wash the ion-exchange membranes. Sea pollution which has been caused by the waste fluid from the use of such strong acids has become a serious problem. Secondly, the above mentioned minerals are of great help in providing a certain mellow character to the taste of salt and in bringing out the taste in other foods. However, the salt manufactured by the conventional method contains so little of the above mentioned minerals that it has only a very sharp salty flavor and can neither accentuate nor bring out the naturally delicious taste in food. Consequently, the taste of salty pickles, bean paste, pickled plums, and other kinds of food has deteriorated. This weak point of the conventionally accepted method of manufacturing salt has been pointed out by a wide assortment of experts.
For these reasons, table salt containing a sufficient amount of minerals is called for. However, conventional methods of manufacturing table salt with supposedly a sufficient amount of minerals prove unhelpful, regardless of whether they lift salt water up to a salt pool, enclose sea water at high tide into an embanked place, or let sea water flow down. Such methods require a vast area for collecting salt, and in a country like Japan where the humidity is high and the rain considerable, this process of collecting salt turns out to have a very low rate of efficiency. Also, excessive labor is needed as well as an extremely high fuel expense for the process of boiling the sea water to gain salt. Accordingly, the production cost would be very high. What is even worse is that since the scale-forming components such as Fe.sub.2 O.sub.3, CaCO.sub.3, CaSO.sub.4, CaCl.sub.2, etc., are eliminated for the safety and maintenance of manufacturing systems during initial stages in the process of boiling the sea water, the salt produced by this method still does not contain enough minerals.
In light of such complications, research has been undertaken for a long time to discover a satisfactory method for the manufacture of salt which would contain a sufficient amount of the natural minerals normally found in sea water. This study has developed a method for manufacturin
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Sakamoto Tamio
Tani Katsuhiko
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