Polyamine Hydrolysis Catalyst for Carbonyl Sulfide Removal

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Solution Overview

Problem

Current methods for removing carbonyl sulfide from process streams, such as amine treatment, non-regenerative adsorbents, and hydrolysis, face limitations including slow reaction rates, limited efficacy, and the production of hazardous hydrogen sulfide gases, which require additional treatment and equipment.

Innovation Solution

A carbonyl sulfide hydrolysis catalyst comprising a solid support with a polyamine covalently bonded to it is used to hydrolyze carbonyl sulfide into hydrogen sulfide, utilizing an aqueous stream and a hydrogen sulfide scavenger to manage the hydrogen sulfide produced, eliminating the need for additional treatment and amine regeneration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If amine treatment is used to remove carbonyl sulfide, then carbonyl sulfide can be removed from the stream, but the reaction is slow and requires long residence times

Engineering Contradiction:

Improvecarbonyl sulfide removalVSAvoidresidence time

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The invention changes the chemical parameters by using a different reaction mechanism (hydrolysis instead of amine reaction) and optimizes physical parameters (temperature, pressure, catalyst composition) to achieve faster carbonyl sulfide conversion while maintaining effective removal

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces a hydrolysis catalyst as an intermediary substance that facilitates the conversion of carbonyl sulfide to carbon dioxide and hydrogen sulfide, enabling the reaction to proceed much faster than amine treatment without requiring long residence times

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If hydrolysis is used to remove carbonyl sulfide, then carbonyl sulfide is converted to carbon dioxide and hydrogen sulfide, but sour gases are generated which must be removed downstream

Engineering Contradiction:

Improvecarbonyl sulfide conversionVSAvoidsour gas generation

Core Design Contradiction:

Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

The invention converts the harmful carbonyl sulfide into hydrogen sulfide through controlled hydrolysis, and then uses a hydrogen sulfide scavenger to convert the hydrogen sulfide into a harmless or easily manageable form, effectively transforming the harmful effect into a controllable process step

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Duration of action of stationary object

If regenerative adsorption is used to remove carbonyl sulfide, then adsorbent media can be regenerated, but efficacy is low due to the shape of carbonyl sulfide limiting adsorption

Engineering Contradiction:

Improveadsorbent lifetimeVSAvoidadsorption efficacy

Core Design Contradiction:

Duration of action of stationary objectVSQuantity of substance

Solution Approach 1:

The invention replaces the physical adsorption mechanism with a chemical reaction mechanism (hydrolysis catalysis), where carbonyl sulfide is chemically converted rather than physically adsorbed, overcoming the limitation of low adsorption efficacy caused by molecular shape constraints

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Quantity of substance

If non-regenerative absorbents are used to remove carbonyl sulfide, then carbonyl sulfide can be absorbed, but the absorbent has limited lifetime which depends on contaminant levels

Engineering Contradiction:

Improvecarbonyl sulfide removalVSAvoidabsorbent lifetime

Core Design Contradiction:

Quantity of substanceVSDuration of action of stationary object

Solution Approach 1:

The invention creates a self-regenerating system where the catalyst continuously facilitates carbonyl sulfide conversion without being consumed, and the hydrogen sulfide scavenger is regenerated in place, eliminating the need to replace absorbent materials and extending operational lifetime

Inventive Principle:

Principle #25Self-service

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 method effectively removes carbonyl sulfide without generating amine-containing waste or requiring additional hydrogen sulfide treatment, offering improved efficiency and safety by converting carbonyl sulfide into hydrogen sulfide, which can be scavenged, thus simplifying the process and reducing operational hazards.

Implementation Method 1

contacting a feed stream comprising carbonyl sulfide with an aqueous stream comprising water in the presence of a carbonyl sulfide hydrolysis catalyst, wherein the carbonyl sulfide hydrolysis catalyst comprises a solid support and a polyamine covalently bonded to the solid support; and hydrolyzing at least a portion of the carbonyl sulfide

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

hydrolyzing at least a portion of the carbonyl sulfide to produce at least hydrogen sulfide

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Data Source

PatentUS20230416088A1Catalyst for carbonyl sulfide removal from hydrocarbons

Publication Date: 2023.12.28 MERICHEM TECHNOLOGIES LLC

AI summary

A method may include: contacting a feed stream comprising carbonyl sulfide with an aqueous stream comprising water in the presence of a carbonyl sulfide hydrolysis catalyst, wherein the carbonyl sulfide hydrolysis catalyst comprises a solid support and a polyamine covalently bonded to the solid support; and hydrolyzing at least a portion of the carbonyl sulfide to produce at least hydrogen sulfide.