JP2009030003A - Hardly-soluble granular sodium bicarbonate and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide new granular sodium bicarbonate hardly soluble in water, although general granular sodium bicarbonate has the property of being dissolved comparatively easily in water, and a method for treating the granular sodium bicarbonate. <P>SOLUTION: The method for manufacturing the granular sodium bicarbonate whose surface is coated with a fatty acid comprises the first step of dissolving the fatty acid in an organic solvent, the second step of immersing the granular sodium bicarbonate in the fatty acid-dissolved organic solvent and agitating the resulting solvent, the third step of separating the fatty acid-adhered granular sodium bicarbonate and preferably recovering the organic solvent, the fourth step of drying the separated fatty acid-adhered granular sodium bicarbonate and the fifth step of crushing the dried fatty acid-adhered granular sodium bicarbonate and sorting the crushed fatty acid-adhered granular sodium bicarbonate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing sodium bicarbonate powder and a water-soluble sodium bicarbonate particle obtained by the production method, and in particular, a specific film is formed on the surface of the sodium bicarbonate powder.

  In recent years, as environmental problems become familiar problems, baking soda powder has attracted attention as various treatment measures. For example, it is well known that the use of baking soda powder has attracted attention in a very wide range from general household goods to the field of advanced technology.

  There are various characteristics of sodium bicarbonate powder, but it has mild alkalinity, has a buffering action to suppress pH change, and has the characteristics that it does not affect other things even if it flows directly into sewage or river after use. The baking soda powder itself is a stable substance at normal temperature and pressure.

  In particular, examples of use in terms of environment, hygiene, and cleaning include concrete structures, tunnel wall surfaces (Patent Documents 1 and 2), vehicle exterior surfaces (Patent Document 3), road surface cleaning and chipping (patents) Document 4), a method for removing dirt by spraying sodium bicarbonate powder (together with water) for cleaning the inner surface of a pipeline (Patent Document 5) and the like. In addition, a proposal (patent document 6) has been made for spraying or spraying sodium bicarbonate powder on weeds in order to withstand weeds or miniaturization.

  In these usage examples, a large amount of sodium bicarbonate powder is used, but there is a great merit that it is not particularly problematic in terms of its harmlessness.

JP 2000-343434 A

JP 2005-324158 A

JP 2006-061791 A

JP 2000-006024 A

JP 2003-181401 A

JP 2003-277209 A

  These environmental, hygienic, and cleaning features are characterized by spraying harmless baking soda powder onto the surface to be cleaned and removing the oils and dust adhering to the surface by the collision of this baking soda powder. Aiming for a blast effect.

  However, baking soda powder has the property of being relatively easy to dissolve in water. For this reason, when baking soda powder is dissolved in water, for example, when washing concrete surfaces, the effect is greatly reduced. Yes. The present invention aims to solve such problems, and provides a sodium bicarbonate powder that is sparingly soluble in water and a treatment method thereof.

  The first gist of the present invention is to provide a sodium bicarbonate powder that is hardly soluble in water, and is characterized in that a fatty acid is adhered to the surface of the sodium bicarbonate powder.

  Preferably, the fatty acid is an organic fatty acid, and among them, one selected from valmitic acid, stearic acid, and oleic acid is preferable.

  The second gist of the present invention is a production method for obtaining the baking soda powder particles of the first invention, the first step of dissolving the fatty acid in the organic solvent, and immersing the baking soda powder particles in the organic solvent. A second step of stirring, a third step of separating the baking soda powder particles to which the fatty acid is adhered, preferably a step of recovering the organic solvent together with such a step, and a fourth step of drying the separated baking powder particles, drying Further, the present invention provides a method for producing a baking soda powder granule having a surface coated with a fatty acid, which comprises a fifth step of pulverizing and classifying the baking soda powder granule.

  The organic solvent to be used is preferably selected from benzene, toluene, and acetone, and the fatty acid is preferably an organic fatty acid, and among them, selected from valmitic acid, stearic acid, and oleic acid. is there.

  Speaking of the first invention, the fatty acid is firmly attached to the surface of the baking soda granule, and thus it is hardly soluble in water used for various treatments. is there. Therefore, for example, even when cleaning the surface of a concrete structure, the effect is the same as the initial stage, and there is a characteristic that there is almost no change over time.

  Speaking of the second invention, the present invention provides an industrial production method in which fatty acids are firmly attached to the surface of baking soda particles, and the treatment method is simple, but the obtained baking soda particles are used together. It is sparingly soluble in water and has a unique effect that is more than just the effect of simply using sodium bicarbonate powder.

  Conventionally, there are two methods of industrial production of baking soda powder, wet and dry methods. Generally, the method used for mass production is an electrolytic method (wet), and caustic soda obtained by the electrolytic method. It is obtained by a method in which carbon dioxide gas is blown into the solution to react and precipitate as crystals. And a crystal | crystallization is isolate | separated and taken out with the separator from the solution containing a sodium bicarbonate powder particle | grain, and after passing through the sieving process, it will pass through the process which is equalized to each particle size and makes a product.

  However, a large amount of the baking soda granules obtained by this method are used in various treatments as described above, but their properties are chemically stable, and even though they are environmentally friendly, they can be dissolved in the water used together. For example, the cleaning effect when the deposits and the like are dropped by spraying with water on the concrete surface is generally lost relatively quickly. However, since the baking soda of the present invention is granular for a long time, the cleaning effect becomes extremely remarkable.

  Hereinafter, the present invention will be described focusing on the second invention. The fatty acid is dissolved in an organic solvent, the sodium bicarbonate powder is immersed and stirred in this, the fatty acid is attached to the surface of the sodium bicarbonate powder, and this is taken out. Thus, a characteristic baking soda powder grain as in the first invention is obtained.

  The organic solvent used in the first step is preferably selected from benzene, toluene, acetone and various alcohols, and the fatty acid is preferably an organic fatty acid, among which valmitic acid, stearic acid, It is selected from oleic acid. Among these, acetone is preferably used, and the reason is that it is excellent as a solvent, and particularly has a high solubility of fatty acid (more specifically, stearic acid). Moreover, it is advantageous in terms of cost, and furthermore, there is not much odor and it is excellent in recoverability.

  The fatty acid is used in an amount of 2 to 10% by weight, preferably 1 to 6% by weight, particularly preferably 3 to 5% by weight based on the organic solvent, and the dissolution of the fatty acid is performed at room temperature to 50 ° C. Of these, stearic acid is particularly preferred as the fatty acid because it has the property that microorganisms are readily degradable in nature and the surrounding environment is less affected by disposal. Moreover, if the concentration of stearic acid is too high, the coated baking soda has a sticking phenomenon, and it becomes easier to form a splint.

  The particle size of the sodium bicarbonate powder used in the second step is about 50 to 500 μm, preferably about 100 to 300 μm. This is because it is suitable for removing small gaps, stubborn dirt, rust, etc. that do not fit your fingertips in various operations, and when used as a herbicide by spraying on weeds, sodium bicarbonate decomposes and carbon dioxide gas is generated. This is because it is easy and can be used as an insect repellent.

  The separation in the third step is not particularly limited, but a known centrifugal separation means is usually employed.

  The drying in the fourth step is not particularly limited, but vacuum drying means is preferable from the viewpoint of workability and quick drying.

  The pulverization in the fifth step is to pulverize so as not to break the original crystals of the baking soda particles. Specifically, since a splint is formed, it is sufficient to lightly disintegrate it.

  More specifically, the second invention is (first step) using acetone as an organic solvent and 3 to 5% stearic acid as a fatty acid, dissolved at 40 to 50 ° C., (second step) 200 μm Sodium bicarbonate powder particles were added and stirred, and the sodium bicarbonate powder particles explained in the first invention were obtained from each step.

  Stearic acid is attached to the surface of the baking soda powder particles, and the characteristic is that sodium bicarbonate powder particles that are hardly soluble in water are obtained, and its application is extremely wide.

  The properties of the obtained sodium bicarbonate powder were pH: 8.2 and hardness 2.5 (Mohs hardness). The confirmation of poor solubility is as follows. When the obtained baking soda powder is put into water, it floats on the surface of the water, and when stirred, the baking soda that has entered the water is repelled by surface tension. That is, the baking soda of the present invention coated with stearic acid has water repellency and is difficult to dissolve in water, but untreated baking soda easily adjusts to water and dissolves.

  The characteristics of the properties of the obtained baking soda powder particles are hardly soluble in water as described above, and it can be said about how the sodium bicarbonate powder treated in the process of the present invention and the sodium bicarbonate powder before treatment are dissolved in water. For example, the baking soda before treatment dissolves very quickly in water. For example, when 5 g of baking soda is added to 100 cc of water at room temperature, it completely dissolves within 10 seconds. On the other hand, the baking soda obtained in the present invention is hardly dissolved even after 10 minutes and is floating on the water.

  Since the baking soda of the present invention has the above-mentioned properties, the range of use thereof is wide-ranging. For example, cleaning of buildings and structures, various vehicles, roads and tunnel walls and their accessories, paving stones, tiles and bricks It can be used for washing stairs, iron fences, removing moss and molds attached to them, and also used for indoor and outdoor cleaning and cleaning of various equipment. Furthermore, insecticide by carbon dioxide when baking soda decomposes The effect can also be expected, and the range of use is extremely wide.

Claims (6)

  Baking soda powder that is sparingly soluble in water, characterized by having fatty acids attached to the surface.   The water-soluble sodium bicarbonate powder according to claim 1, wherein the fatty acid is valmitic acid, stearic acid, or oleic acid.   First step of dissolving fatty acid in organic solvent, second step of immersing sodium bicarbonate powder in organic solvent and stirring it, third step of separating sodium bicarbonate powder to which fatty acid is adhered, separated said baking soda A process for producing a baking soda powder having a fatty acid coated on the surface, comprising: a fourth process for drying the powder, and a fifth process for pulverizing and classifying the dried baking soda powder.   The manufacturing method of the baking soda powder particle | grains by which the process of collect | recovering organic solvents was added to the 3rd process, and the surface coated with the fatty acid.   The method for producing baking soda powder particles, wherein the organic solvent is selected from benzene, toluene, and acetone, and the surface is coated with a fatty acid.   The method for producing a baking soda granule having a fatty acid coated on a surface thereof according to any one of claims 3 to 5, wherein the fatty acid is selected from valmitic acid, stearic acid, and oleic acid.