Halogenated Hydantoin and Haloamine Microbe Control

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Solution Overview

Problem

In pulp and paper processing systems, biofilm formation caused by bacteria leads to corrosion issues and efficiency losses due to the corrosive nature of haloamines and chlorine dioxide when used for microbe control, necessitating a method that balances cost savings with reduced gas-phase corrosion.

Innovation Solution

Combining halogenated hydantoins with haloamines or chlorine dioxide in specific portions of the system, where halogenated hydantoins are added to areas prone to gas-phase corrosion, while haloamines or chlorine dioxide are used elsewhere, maintaining compatibility and efficacy without excessive free chlorine.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If haloamines or chlorine dioxide are used for microbe control, then cost savings are achieved compared to halogenated hydantoins, but gas-phase corrosion of system components increases significantly

Engineering Contradiction:

Improvecost savingsVSAvoidgas-phase corrosion

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent applies different chemical treatments to different locations within the pulp and paper system. Halogenated hydantoins are used specifically in areas prone to gas-phase corrosion (short loop, press section, dryer section) while haloamines or chlorine dioxide are used in other portions of the system where corrosion is less of a concern. This localized differentiation resolves the contradiction by protecting corrosion-sensitive areas while maintaining cost savings in other areas.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If halogenated hydantoins are used throughout the entire system, then gas-phase corrosion is reduced, but overall cost increases due to higher chemical expenses

Engineering Contradiction:

Improvegas-phase corrosionVSAvoidoverall cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

Instead of uniformly applying halogenated hydantoins throughout the entire system, the patent restricts their use to specific corrosion-prone areas (short loop, press section, dryer section). This localized application maintains corrosion protection where needed while reducing overall chemical costs by using less expensive haloamines or chlorine dioxide in other portions of the system.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent divides the pulp and paper system into distinct segments based on corrosion risk. The short loop, press section, and dryer section are segmented as high-risk areas requiring halogenated hydantoin treatment, while other portions are segmented as lower-risk areas suitable for haloamine or chlorine dioxide treatment. This segmentation resolves the cost contradiction by optimizing chemical usage to match actual corrosion risk distribution.

Inventive Principle:

Principle #1Segmentation

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

This approach significantly reduces gas-phase corrosion in sensitive areas like the short loop, press, and dryer sections while maintaining effective microbe control, allowing for cost savings from using haloamines or chlorine dioxide throughout the system.

Implementation Method 1

Halogenated hydantoins are effective at killing bacteria in the sessile state and preventing slime formations

Methodology Applied

Scientific EffectBiocidal action:

Implementation Method 2

Haloamines can be formed by combining an ammonium source with an oxidant such as sodium hypochlorite

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 3

The evaporation tendency of haloamines can be orders of magnitude greater than that of sodium hypochlorite

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 4

Chlorine dioxide, however, when dosed in process water remains in gaseous form and thus suffers from the same gas phase corrosion issues as haloamines

Methodology Applied

Scientific EffectGas phase corrosion:

Data Source

PatentUS8986606B2Chemistry for effective microbe control with reduced gas phase corrosiveness in pulp and paper processing systems

Publication Date: 2015.03.24 KEMIRA OY

AI summary

Processes for biofilm or microorganism growth control in an aqueous system such as a pulp, paper or board manufacturing system are described in which a halogenated hydantoin is added to the aqueous system in combination with haloamine, chlorine dioxide or a combination thereof. The halogenated hydantoin is preferably a fully or partially halogenated dialkyl hydantoin, and more preferably 5,5-dimethyl hydantoin or 5-methyl-5-ethyl hydantoin. The haloamine is preferably a monohaloamine, dihaloamine, trihaloamine, or a combination thereof, and more preferably monochloramine, monobromamine, bromochloroamine or a combination thereof. The halogenated hydantoin is preferably added to the aqueous system in portions of the system susceptible to gas phase corrosion, such as the short loop of the system, and the haloamine and chlorine dioxide are preferably added to other portions of the system. The halogenated hydantoin and haloamine and/or chlorine dioxide maintain good compatibility with each other in the absence of excess free chlorine.