JPS59199039A - Deodorant and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture a deodorant having high deodorizing efficiency and long life by adding an oxide of iodine and/or an oxo acid of iodine to active carbon. CONSTITUTION:An aq. soln. of oxo acid of iodine is prepd. by dissolving about 0.01-1.0mol/l oxo acid of iodine such as HIO3 or HIO4 in water. Active carbon is immersed therein for >=5min, and a deodorant is prepd. by drying the immersed active carbon by heating at <=250 deg.C. Since the deodorant comprises an oxide of iodine such as I2O5 and an oxo acid of iodine such as HIO3 or HIO4 adsorbed to the surface of active carbon, a deodorant having superior deodorizing effect an long life is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deodorizing agent with good deodorizing effect and long life, and a method for producing the same.

Today, odor pollution has become a serious social problem.

Hydrogen sulfide (Has) is often the main cause of foul odor pollution, and the effectiveness of deodorization depends on how much hydrogen sulfide can be removed. This is considered an important point to know.

Various methods are used for deodorizing equipment to remove bad odors, such as cleaning/absorption methods, adsorption methods, combustion methods, oxidation methods, and masking methods, but the adsorption deodorization method has low equipment costs. It is widely used today because it is safe, easy to operate, and resistant to load fluctuations.

Conventionally, activated carbon was mainly used as a deodorizing agent for this adsorption deodorization method, but since hydrogen sulfide, which is the main cause of bad odors, is a low-molecular, low-boiling, polar compound, it cannot be adsorbed by activated carbon. <<For this reason, the following are currently commercially available as IIt+! odorants for removing hydrogen sulfide.

A deodorizer that has undergone special chemical treatment such as impregnating activated carbon with a strong alkaline agent.

(B) Hydroxylated-2@ type deodorizer.

(A deodorizing agent made of 0 ion exchange resin.

The deodorizing agent (2) focuses on the fact that H2S is weakly acidic, and the surface deodorizing agent focuses on the reaction between ferric hydroxide and ferric hydrogen hydride. However, all deodorizers have the disadvantage of short breakthrough times, that is, short lifespans.

This invention was made in view of the above circumstances, and aims to provide a deodorizing agent with high deodorizing efficiency and long life, and a method for producing the same.

The deodorizing agent of the present invention contains oxides of iodine such as niodine pentoxide (IzOa) and oxoacids of iodine such as iodic acid (HIO8) and periodic acid (HI 04; ), or any of these is attached to the surface of activated carbon such as coconut shell activated carbon.

To produce this leopard absorbent, first, iodine oxoacid,
For example, I Od' HI 04 is 0.01 to 1.0
Prepare an oxoacid aqueous solution of iodine by dissolving it in water to the extent of mol/J! ((j L,, immerse activated carbon in this for at least 5 minutes.

Next, this soaked activated carbon is heated and dried at 250'C or less.

Here, the concentration of the aqueous solution of iodine oxoacid is 1. Qmo
The reason for setting it below 1/e is that if the concentration is higher than this, many of the pores of the activated carbon will be blocked by the oxoacid, the adsorption capacity of the activated carbon will decrease, and the performance of the deodorizer of this invention will therefore decrease. Moreover, the lifespan is shortened. In addition, the concentration of the aqueous solution of iodine oxoacid is 0.01 mol/if
The reason for setting it above f is that at shallower depths than this, the amount of oxoacid impregnated on the activated carbon is small and good deodorizing performance cannot be obtained.

The HIO,W)rIOμ of this aqueous solution is impregnated onto the surface of the activated carbon without being released. It is considered that TI IO> HI 04 attached to the surface of the active plate gradually dehydrates and decomposes as it dries to become I2011. T-I Os%) r I 04, ■ has a strong oxidizing effect, but ordinary 41 N such as potassium permanganate, potassium dichromate, potassium chromate
Unlike the a-oxidizing agent, it is not rapidly reduced by the t-substances in activated carbon or the catalytic action, and retains the ability to oxidize hydrogen sulfide, which is relatively easily oxidized when attached to the surface of activated carbon. continue.

The deodorizing mechanism of the deodorizing agent of this invention is considered as follows.

If attached to the surface of activated carbon of the deodorizer of this invention
Os oxidizes hydrogen sulfide (TT2Sl) adsorbed on activated carbon. This reaction is shown by the following equation.

I' ++3 H2S → I-+(STT-+3S
↓In this way, it is thought that the adsorption reaction between the deodorizer of the present invention and Hβ oxidizes H2S to a simple ion (S). Therefore, in the adsorption process of this deodorizer, the adsorption effect is the main one, and the H2S adsorbed on activated carbon
It is thought that the desorption effect of desorption from activated carbon is hardly involved. Therefore, the deodorizer of the present invention pushes hydrogen sulfide in the direction of adsorption, and hydrogen sulfide is continuously adsorbed on the surface of activated carbon. Furthermore, as can be seen from the above formula, 1 mole of I, O, can oxidize 6 moles of hydrogen sulfide, so this deodorizer can treat a large amount of hydrogen sulfide.

Next is the fruit 1. This invention will be explained in more detail with reference to examples.

[Example 1] Commercially available crushed coconut husk charcoal (4 to 8 mθah, specific surface area about 110Or71'
/g) for 24 hours, and then heated and dried at 120°C for 3 hours to obtain a deodorizing agent (8).

Next, the commercially available crushed coconut husk charcoal was immersed in an aqueous solution of 0.2 mol/g of I (IO) and treated under the same conditions to obtain a deodorizing agent [F].

The two types of deodorizing agent 1 (5)) obtained in this way, the untreated commercially available crushed coconut husk charcoal, and the representative commercially available desulfurizing agent 3a +'Q n■ (both (also based on activated carbon) were subjected to the following tests.

As shown in FIG. 1, the experimental equipment used was one in which an adsorption tube 1 through which the experimental gas was passed was covered with a jacket 2.

This one! ! i A stepped portion 3 is provided in the fitting pipe 1,
An experiment was conducted in which the above-mentioned deodorizing agent was added to form a deodorizing agent layer 4 having a thickness of 7 layers. An experimental gas was flowed into the adsorption tube 1 from below this layer 4 upward, and 25° C. hot water was flowed into the jacket 2 to maintain the temperature inside the adsorption tube 1 at 25° C. Air with a hydrogen sulfide concentration of IDQppln was used as the experimental gas, with a relative temperature of about 50%, a temperature of about 25°C, and t7.
Ta.

Other experimental conditions were as follows.

Adsorption tower cross-sectional area 12.6CI Empty column raft 1 velocity (LV value 3 4 [] Mcc space velocity C
8V value) 20,600 hr' In order to compare the performance of each deodorizer, the hydrogen sulfide concentration in the experimental gas at the inlet and the hydrogen sulfide concentration in the treated experimental gas at the outlet were measured every hour.

The experimental gas flow time for each deodorizer and the outlet hydrogen sulfide concentration (
The relationship between the ratio of Cou+:)/inlet sulfide water sac concentration fcix1) (breakthrough $=Cout/C1n XI DO) is shown in FIG. In addition, Table 1 below shows the 1%, 5%, and 10% breakthrough times of each deodorizer determined from the measurement results.

Table 1 From these results, it can be seen that the deodorizing agent (A) (2) of the present invention can efficiently deodorize hydrogen sulfide for a long time.

[Example 2] The humidity of the exhaust gas to be treated is the deodorizer CA of the present invention)
An experiment was conducted to see the effect of (B) on life. The experiment was conducted at relative humidity of 0% and 80%, and the other experimental conditions were the same as those in Example 1. It +2 target is cal tongue fi 33[! crushed coconut husk charcoal, commercially available desulfurization agent (C) [F],
Table 2 shows the measured 1%, 5%, and 10% breakthrough times.

Table 2 (#i bisection It can be seen that it is resistant to fluctuations in .

In the above embodiments, the adsorption of hydrogen sulfide was described, but since the deodorizer of the present invention uses activated carbon as a carrier, it can also be applied to the adsorption treatment of other malodorous substances.

As explained above, the deodorizing agent 1 of the present invention is produced by soaking activated carbon in an aqueous solution of iodine oxoacid and then heating and drying it, and the iodine alcoholic acid and iodine oxoacid are adsorbed on the surface of the activated carbon. Because it is a deodorizing agent, it is easy to manufacture, has an excellent effect in deodorizing bad odors caused by hydrogen sulfide, and has a long life. Therefore, by using this deodorizing agent, the cost of deodorizing treatment can be reduced. It is economical.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the adsorption deodorization equipment used in the experiment in Example 1.2, and Fig. 2 shows the output hydrogen sulfide concentration/input hydrogen sulfide concentration x 100 - distribution determined in Example 1. It is a graph of time.

Claims (2)

[Claims] (1) A deodorizing agent characterized in that activated carbon is impregnated with an iodine oxide and/or an iodine oxoacid. (2) A method for producing a deodorizing agent, which comprises immersing activated carbon in an aqueous solution of iodine oxoacid and drying it.