Halohydantoin Drying via Inert Gas and Vacuum

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Solution Overview

Problem

Halohydantoin compounds are unstable at normal temperatures, decompose when suspended in water or mixed solvents, leading to a decrease in purity and causing equipment corrosion due to liberated elemental iodine, resulting in low yield and unmentioned purity in existing refining methods.

Innovation Solution

A method involving drying a composition containing water, organic solvent, and halohydantoin under reduced pressure with an inert gas introduction to remove impurities, achieving a purity of not less than 98% and reducing elemental halogen content to not greater than 0.9% by mass, thereby stabilizing the compound and preventing decomposition and corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If halohydantoin compound is dried under reduced pressure without inert gas introduction, then drying efficiency is improved, but the compound decomposes to liberate elemental iodine causing coloring and equipment corrosion

Engineering Contradiction:

Improvedrying efficiencyVSAvoidequipment corrosion and compound coloring

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies the inert atmosphere principle by introducing an inert gas (such as nitrogen or carbon dioxide) into the drying system. The inert gas creates a protective atmosphere that prevents the halohydantoin compound from decomposing and liberating elemental iodine during the drying process. This resolves the contradiction by maintaining drying efficiency while preventing equipment corrosion and compound coloring through the inert gas barrier.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Stability of the object's composition

If halohydantoin compound is refrigerated for preservation, then stability is improved, but operational convenience deteriorates

Engineering Contradiction:

Improvecompound stabilityVSAvoidoperational convenience

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The patent applies inert atmosphere by sealing the halohydantoin compound in containers filled with inert gas. This allows the compound to be stored at room temperature while maintaining stability, eliminating the need for refrigeration. The inert gas prevents decomposition and maintains purity, thus resolving the contradiction between stability and operational convenience.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Speed

If halohydantoin compound is heated in wet material state, then drying speed is improved, but decomposition increases liberating hydantoin compound and elemental iodine

Engineering Contradiction:

Improvedrying speedVSAvoidcompound purity

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The patent applies inert atmosphere during the drying process by introducing inert gas into the drying system. This allows heating to be applied more effectively and safely in the presence of inert gas, increasing drying speed without causing decomposition. The inert gas prevents the liberation of elemental iodine and hydantoin compound, thus maintaining high purity while achieving faster drying.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

4Ease of manufacture

If existing refining methods are used, then processing simplicity is improved, but yield decreases to 75% and purity is not achieved

Engineering Contradiction:

Improveprocess simplicityVSAvoidyield and purity

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent applies inert atmosphere to the refining process by conducting the drying operation in an inert gas environment. This simple modification to the existing refining method prevents decomposition during drying, thereby increasing both yield and purity without adding significant process complexity. The inert gas protection ensures high-quality product while maintaining ease of manufacture.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The method effectively removes impurities from halohydantoin compounds, enhancing their stability, purity, and preventing equipment corrosion, while maintaining a low elemental halogen content, thus improving the refining process.

Implementation Method 1

drying the composition under reduced pressure in the dryer, the reduced pressure being reduced to a pressure lower than atmospheric pressure while introducing an inert gas from an outside source into the dryer

Methodology Applied

Scientific EffectReduced pressure drying: Vacuum

Implementation Method 2

remove a component such as water from a composition containing the halohydantoin compound

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentEP2940011B1Production method for halohydrantoin compound and halohydrantoin compound

Publication Date: 2019.07.24 NIPPON CHEMICALS CO LTD

Figure 1

AI summary

A method for producing a halohydantoin compound according to the present invention includes the steps of: (a) providing, in a dryer, a composition containing (i) at least one component selected from the group consisting of water, an organic solvent, and elemental halogen and (ii) a halohydantoin compound; and (b) drying the composition under reduced pressure in the dryer, the reduced pressure being reduced to a pressure lower than atmospheric pressure while introducing an inert gas from an outside source into the dryer.