JP4868631B2 - Storage method of hydrolyzable substances - Google Patents

Description

【００２１】
第１表からも明らかなように、マグネシウム系の乾燥剤を用いた本発明の保存方法は従来イソシアネート類の輸送時に使用されていたシリカゲルを用いた場合に比べて格段に保残安定性が優れており、加水分解性物質を長期にわたり保存することができる。
また、加水分解性物質を輸送する場合も、本発明を適用することにより、より確実に輸送することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for storing a hydrolyzable substance.
[0002]
[Prior art]
Hydrolyzable substances such as isocyanate are generally unstable, and need to be stored at low temperature and low humidity for long-term storage.
Also, when transporting these substances, silica gel was used as a desiccant, and a cold car and a refrigerated container were used.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a method for preserving a hydrolyzable substance for a long period of time while maintaining high quality immediately after production.
[0004]
[Means for Solving the Problems]
That is, the present invention uses a desiccant comprising 100 parts by weight of magnesium chloride, 40 to 60 parts by weight of magnesium oxide, and 30 to 70 parts by weight of a water retention agent comprising magnesium hydroxide and another water retention substance. This is a storage method for the hydrolyzable substance. According to the present invention, high quality immediately after production can be maintained over a long period of time in transportation and storage of hydrolyzable substances.
[0005]
The present invention will be described in detail below.
The desiccant used in the present invention is, for example, as described in Japanese Patent Publication No. 2671021, and contains 100 parts by weight of magnesium chloride, 40 to 60 parts by weight of magnesium oxide, and water holding water composed of magnesium hydroxide and other water holding substances. It is a desiccant comprising 30 to 70 parts by weight of the agent.
[0006]
Magnesium chloride is preferably an anhydrous salt with a large moisture absorption. Magnesium oxide having a high activity called light-burned magnesia or caustic magnesia is suitable. Magnesium hydroxide may be granular or powdery, but those having a relatively large surface area are effective. Examples of water-retaining substances include mineral substances, cements, and organic polymers, among which silica, vermiculite, barlite, bentonite, diatomaceous earth, and the like are preferable.
In producing the desiccant of the present invention, it can be obtained by mixing each powder, granular product, coarse product, etc. of magnesium chloride, magnesium oxide, magnesium hydroxide and water-retaining substance. It is preferable to use the obtained desiccant in a moisture-permeable container.
Examples of the moisture-permeable container include a bag-like container whose entire surface is a moisture-permeable surface, and a container having a moisture-permeable surface on the top. As a material constituting the moisture permeable surface, it is preferable to use a moisture permeable impermeable sheet which allows water vapor to pass therethrough but does not transmit water, and more preferably a microporous polypropylene sheet laminated with a polyethylene nonwoven fabric.
[0007]
Although there will be no restriction | limiting in particular if it is a desiccant which satisfy | fills the said conditions, Nisso Dry M (made by Nippon Soda Co., Ltd.) is more preferable.
[0008]
The hydrolyzable substance according to the present invention is an agrochemical raw material, an agrochemical intermediate, an agropharmaceutical, and a chemical that are easily hydrolyzed, and includes a mixture containing them.
Examples of the substance include isocyanates or isothiocyanates such as tolidine-o-diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, naphthalene isothiocyanate,
acid halides such as p-nitrobenzyl chloroformate, 2-naphthylchlorothionoformate, stearic acid chloride,
And halogenating agents such as N, N, N-trichlorocyanuric acid.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The container for storing the hydrolyzable substance is not particularly limited as long as it has a low moisture permeability and is made of a chemical-resistant material, but a glass container or a resin container or a resin bag made of polyethylene, polypropylene, or the like. Is mentioned.
This container is preferably one that can maintain sufficient airtightness. In particular, when placed in a bag-like container, it is preferable that the container is stopped with a band such as a rubber band or an insulation lock tie or sealed with a sealer. These containers containing hydrolyzable substances can be placed in a further second container in order to shield them from the outside world. The second container is not particularly limited as long as it can block the first container from various factors such as humidity, impact, light, temperature, and the like. For example, a container made of the same material as the first container, wooden A container, a metal container, etc. are mentioned.
[0010]
The desiccant according to the present invention may be put directly into the first container in which the hydrolyzable substance is directly put, or can be put inside the second container outside the container.
[0011]
When the desiccant according to the present invention is added, the inside of the container may be replaced with dehumidified air or an inert gas such as nitrogen.
[0012]
【Example】
EXAMPLES Next, an Example is given and this invention is demonstrated still in detail.
The purity and turbidity described in the examples were measured by the following methods.
[0013]
The purity was measured according to the tolidine diisocyanate test method described in JISK1556. 40 ml of dry toluene was added to a 500 ml stoppered Erlenmeyer flask, and 50 ml of di-n-butylamine solution was further added and mixed. Next, add 2 g of the sample, dissolve by shaking, and let stand for 15 minutes. 225 ml of isopropyl alcohol and 0.8 ml of bromocresol green indicator were added, and titrated with N / 2 hydrochloric acid while shaking well. The end point was the point where the blue color disappeared and the yellow color persisted for at least 15 seconds. A blank test was performed under the same conditions. And the purity was computed from the following formula | equation.
A = {4.354x (C−B) xf} / S
A: Purity (%)
B: Amount of N / 2 hydrochloric acid used for titration of sample (ml)
C: Amount of N / 2 hydrochloric acid used for the blank test (ml)
f: Factor of N / 2 hydrochloric acid S: Weight of sample (g)
[0014]
The turbidity was measured according to the industrial water test method described in JISK0101.
A 10 g sample was made up with 50 ml MCB, and the turbidity of the sample was determined by visual comparison with the kaolin standard solution. The kaolin standard solution was prepared by dispersing 1.0 g of purified kaolin in 1000 ml of water, and this was used as a 1000 degree kaolin standard solution. The standard solution was further diluted 10 times to obtain a 100 degree kaolin standard solution, and further diluted 10 times to obtain a 10 degree kaolin standard solution.
[0015]
Example 1
50 kg of trizine-o-diisocyanate (hereinafter referred to as TODI) was put in a plastic bag (made of low density polyethylene), and further Nissau Dry M (200 g) was put and sealed with an insulation tie. It was put in an aluminum laminated fiber drum, and the drum lid was fixed with a wiring band seal and stored at room temperature. Purity 100% after 12 months, turbidity 5 degrees or less.
[0016]
Example 2
TODI was preserve | saved by the method similar to Example 1 using Nisso Dry M100g. Purity 99.9% after 12 months, turbidity 5 degrees or less.
[0017]
Comparative Example 1
TODI was stored in the same manner as in Example 1 using 200 g of silica gel. Purity 99.8% after 12 months, turbidity 100 degrees.
[0018]
Comparative Example 2
TODI was stored in the same manner as in Example 1 without a desiccant. Purity 99.6% after 12 months, turbidity 300 degrees.
[0019]
【Effect of the invention】
Table 1 shows the turbidity of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. An increase in turbidity means an increase in impurities, indicating a decrease in quality.
[0020]
[Table 1]

[0021]
As is clear from Table 1, the preservation method of the present invention using a magnesium-based desiccant has much better retention stability than when using silica gel, which has been conventionally used for transporting isocyanates. The hydrolyzable substance can be stored for a long time.
Further, when a hydrolyzable substance is transported, it can be transported more reliably by applying the present invention.

Claims (1)

The isocyanates are stored at room temperature using a desiccant comprising 100 parts by weight of magnesium chloride, 40 to 60 parts by weight of magnesium oxide, and 30 to 70 parts by weight of a water retention agent comprising magnesium hydroxide and other water retention substances . A method for preserving isocyanates.