JPS63257571A - Deodorizing composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a deodorizing composition prepared and provided in solid form, which can be easily made into an aqueous solution, and the aqueous solution can be used in toilet tanks, toilet bowls, etc.
The present invention relates to a composition suitable for deodorizing sources of odor that can be sprayed with liquid, such as kitchen waste, sludge, and livestock barns.

[Prior Art] Removing bad odors generated in the living environment is one means of improving the environment, and various methods are used. Means for removing odor include installing a deodorizer in the space where the odor is generated, and combining a deodorizer with a forced air circulation system at the source of the odor, but these methods have poor odor removal efficiency. do not have. On the other hand, it is natural that it is more efficient to take preventive measures at the source of the odor and its vicinity.

For these reasons, deodorizers, especially aqueous solution types, that are sprayed directly onto the source of bad odor have come into use in recent years. The use of water as a solvent has the advantage that water is the cheapest and safest solvent, and that bad odors are also removed by the water body.

[Problem that the invention seeks to solve]

Malodorous substances have a wide range of chemical structures. The human body senses malodors when malodorous substances reach the nostrils in the form of gas. Methods for preventing the detection of this malodor include (1) masking effect due to the presence of aromatic substances, (2) adsorption of malodorous gas by an adsorbent, and (2) removal of malodorous gas by chemical reaction.

When a deodorizing agent is used as an aqueous solution, a chemical reaction of the aqueous solution is utilized.

However, a problem with aqueous deodorizing agents is that storage, transportation, etc. are troublesome and expensive. This problem can be solved by supplying the deodorizing agent as a solid that is easily soluble in water and creating a composition that can be made into an aqueous solution immediately before use.

[Means for solving the problem] There are a wide variety of substances that function as deodorizing agents, but inorganic compounds, especially polyvalent metal salts, have a fast reaction rate with malodorous substances, are easily soluble in water, and Some have advantages such as easy handling, and can be advantageously used as aqueous deodorizers. The present inventor has proposed a powder composition containing a polyvalent metal salt as an active ingredient, which has deliquescent properties, corrosion,
The present invention has been achieved by successfully obtaining a composition that can be easily prepared into an aqueous solution and capable of removing a wide range of bad odors without the risk of coloring.

That is, the present invention relates to a deodorizing composition comprising a powder mixture of zinc sulfate, aluminum sulfate, sodium citrate and a pl+ regulator.

Each component of the present invention is preferably a powder as fine as possible, for example, a powder of 30 meshes or passes, and the composition of the present invention can be obtained by mechanically mixing them.

The deodorizing active ingredients of the composition of the invention are zinc sulfate and aluminum sulfate. Zinc sulfate has the property of reacting with and removing acidic malodorous gases represented by hydrogen sulfide. Additionally, aluminum sulfate reacts with and removes alkaline foul-smelling gases such as ammonia. Therefore, an aqueous solution containing both of them can remove both acidic and alkaline malodorous gases.

In the composition of the present invention, zinc sulfate and aluminum sulfate are usually zinc sulfate/aluminum sulfate (each anhydrous) or zinc sulfate heptahydrate/aluminum sulfate 18-hydrate in a ratio of 85/15 to to/90 (weight ratio). used in

However, when the two types of inorganic salts mentioned above coexist in the same aqueous solution, they tend to form a precipitate.

The formation of the above-mentioned precipitate can be prevented by incorporating a chelate forming agent. Sodium citrate is an inexpensive chelating agent and is suitable for the purposes of this invention. The amount of sodium citrate is 0.5 to 1.
It may be about 5 times the weight.

Therefore, the powder mixture consisting of zinc sulfate, aluminum sulfate and sodium citrate dissolves in water without forming a precipitate, giving an aqueous solution having a deodorizing effect.

However, although the aqueous solution has a high ammonia absorption capacity, its absorption capacity for acidic malodorous gases typified by hydrogen sulfide is somewhat inferior. The above aqueous solution usually exhibits an acidity of about pl+=3, depending on the composition, but by adding a pHgPiJ adjuster to it, the pH of the aqueous solution is around neutral, that is, the pH when dissolved in 3 to 100 times the amount of water. When it is in the range of 5.5 to 8.5, the absorption capacity for acidic malodorous gas increases.

As the pH adjuster used for this pl+ adjustment, sodium carbonate, potassium carbonate, or sodium bicarbonate is suitable. All of these are easy to handle as powder,
It has good solubility and the resulting aqueous solution also has high deodorizing performance.

The deodorizing agent of the present invention can be produced by mixing any of the solid agents mentioned above using a known mixer, such as a rotary drum blender. The mixed solid deodorizing composition is stable for a long period of time when packed in a paper bag.

In use, the composition of the present invention is mixed with water to form an aqueous solution, and the appropriate amount of water is 3 to 100 times the amount of the composition.

[Effects of the Invention] Since the deodorizing composition of the present invention has a wide range of application to malodorous gases, it is useful for use against actual malodor sources that generate multiple malodorous gases and malodor sources whose malodorous components are unknown. be. The purpose can be achieved by directly spraying or spraying an aqueous solution onto objects such as kitchen waste, toilet tanks, sludge, and livestock sheds. It is also possible to use an aqueous solution in a scrubber such as a deodorizing tower.

When the deodorizer of the present invention is sprayed in the form of an aqueous solution, what it adheres to is colorless and does not contaminate the surrounding environment or the clothes of workers. In addition, since it is stable for a long period of time in a solid state, transportation costs can be reduced.

(Examples) The present invention will be described in detail below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 Zinc sulfate (ZnSOa・711zO) 106 g 1
Aluminum sulfate (81□ (S04), 3.188 z
O) 596g, sodium citrate (dihydrate) 29
8 g of sodium carbonate and 208 g of sodium carbonate were mixed to prepare a deodorizing composition consisting of powder.

This was placed in a paper bag and left at room temperature for 30 days. After 30 days,
This deodorizing composition has the same appearance as the time of preparation, and has a stickiness of 1.
There were no problems with coloring.

Example 2 10 parts of zinc sulfate (ZnSOt 711zO) in 10 parts of water
．． 6g, aluminum sulfate (81z (S04) + 18
11□0)59. h, sodium citrate (dihydrate)
Add 29.8g and 20.8g of sodium carbonate, pl
+6.0) Yong? I made 8 rounds of the night.

Take the above solution 10- into a vetri dish and put it into a desiccator with an internal volume of 11.5β2. Hydrogen sulfide was charged into a desiccator to a concentration of 35 ppm, and the hydrogen sulfide gas concentration after a certain period of time was measured using a detection tube. Similar measurements were performed using 1 Q ml of distilled water as a control solution.

The results are shown in Table 1.

Table 1 Effect on hydrogen sulfide Example 3 Take the solution 10- prepared in Example 2 into a Petri dish, put it in a desiccator with an internal volume of 11.51, and charge ammonia in the desiccator to a concentration of 320 ppm. The ammonia concentration after a certain period of time was measured using a detection tube. Similar measurements were performed using distilled water as a control solution. The results are shown in Table 2.

Table 2 Effect on ammonia □ Example 4 Zinc sulfate (ZnSOa -7HzO) 10.6g, aluminum sulfate (AI□(S04)3・L8HzO) 5
9.6g Sodium citrate (dihydrate) 29.8
A solution of pne, o was prepared by adding 15.2 g of sodium hydroxide to 10 Il of water.

Take the above solution 10- in a Petri dish, put it in a desiccator with an internal volume of 11.51, and add 3 hydrogen sulfide to the desiccator.
The hydrogen sulfide gas concentration was measured after a certain period of time using a detection tube. Similar measurements were performed using distilled water as a control solution. The results are shown in Table 3.

Table 3 Effect on hydrogen sulfide Example 5 Zinc sulfate (ZnSOt H711zO) 10.6g, aluminum sulfate (Alt(SOe)t・18HzO) 5
9.6g, sodium citrate (dihydrate) 29.8
Based on g, make into an aqueous solution, p) 15.7.8.9
(each with sodium carbonate added to make it)? 10
1il, put 10 ml of the liquid in a Petri dish, and make the inner volume 1
The sample was placed in a 1.5β desigator, and the removal rate of hydrogen sulfide and ammonia was measured in the same manner as in Examples 2 and 3. The results are shown in Tables 4 and 5.

Table 4 Effect on hydrogen sulfide Table 5 Effect on ammonia Example 6 901 water to 10 β solution prepared with the same component ratio as Example 2
! Add diluted solution 100 β! ! Prepared. Next, at a landfill of sludge with a peculiar odor generated at a sewage treatment plant in Himeji-nu, the above diluted solution was sprayed using a sprayer at a concentration of about 100 mZ per 1 inch of sludge surface.

This sludge potentially contains ammonia and hydrogen sulfide, and when measuring the gas concentration with a detection tube at a height of 1 cm on the sludge surface before spraying, the concentration of ammonia can vary from 50% to 50% depending on the location.
150 ppm detected, or hydrogen sulfide 2-10
ppm was detected. Table 6 shows the measurement results at the same point before spraying and 1 hour after spraying.

Table 6 Deodorizing effect on sludge

Claims (1)

[Claims] 1. A deodorizing composition comprising a powder mixture of zinc sulfate, aluminum sulfate, sodium citrate, and a pH adjuster. 2. The deodorizing composition according to claim 1, wherein the pH adjuster is sodium carbonate, potassium carbonate, or sodium bicarbonate. 3. Claim 1, wherein the pH of the aqueous solution when the composition is dissolved in 3 to 100 times the weight of water is 5.5 to 8.5.
The deodorizing composition according to item 1 or 2.