Analysis of the reasons for the price difference between monoethanolamine and triethanolamine Analysis of the reasons for the price difference between monoethanolamine and triethanolamine

The price gap between monoethanolamine and triethanolamine is very large, and the surface conclusion of the industry can be attributed to: monoethanolamine is a one-step main product, easy to purify at low cost, and triethanolamine is a multi-step series by-product and a difficult refining product. However, from the perspective of chemical reaction kinetics, physical property mass transfer mechanism, industrial coproduction economic model and market quality premium, the price difference between the two is a huge difference between monoethanolamine and triethanolamine. The surface conclusion of the industry can be attributed to: monoethanolamine is a one-step main product, easy to purify at low cost, and triethanolamine is a multi-step series by-product and a difficult refining product. However, from the perspective of chemical reaction kinetics, physical property mass transfer mechanism, industrial coproduction economic model and market quality premium dimensions, the price difference between the two is the innate difference of reaction selectivity, physical property mass transfer barriers, coproduction capacity structure, quality grading threshold Reaction selectivity innate difference, physical property mass transfer barrier, coproduction capacity structure, quality grading threshold The inevitable result of the superposition of multiple factors is not a simple process step difference, and its underlying industrial logic has strong professionalism and industry particularity. The inevitable result of the superposition of multiple factors is not a simple process step difference, but its underlying industrial logic has strong professionalism and industry particularity.

1. Reaction kinetics level difference: innate selectivity determines production cost baseline 1. Reaction kinetics level difference: innate selectivity determines production cost baseline

The synthesis of ethanolamine system belongs to the typical synthesis of ethanolamine system belongs to the typical amino step-by-step ethoxylation tandem reaction amino step-by-step ethoxylation tandem reaction , the addition reaction of ammonia gas and ethylene oxide has strict step-by-step characteristics: NH 🥰 → MEA (monoethanolamine) → DEA (diethanolamine) → TEA (triethanolamine), the three-step reaction is irreversible, progressive, and there is no parallel shortcut, which is the core root of the cost differentiation of the two., The addition reaction of ammonia gas and ethylene oxide has strict step-by-step characteristics: NH 🥰 → MEA (monoethanolamine) → DEA (diethanolamine) → TEA (triethanolamine), the three-step reaction is irreversible, progressive, and there is no parallel shortcut, which is the core of the cost differentiation of the two Root.

The synthesis of monoethanolamine has a very strong kinetic priority. In industrial production, the synthesis of monoethanolamine has a very strong kinetic priority. In industrial production, by controlling the high ammonia ratio (ammonia excess 4-6 times), medium and low temperature and low pressure (50-80 ℃, 1-2MPa) high ammonia ratio (ammonia excess 4-6 times), medium and low temperature and low pressure (50-80 ℃, 1-2MPa) operating conditions, the subsequent secondary and tertiary addition reactions can be greatly inhibited, and the reaction thermodynamics and kinetics are completely biased towards the generation of single-substituted products. The one-way selectivity of monoethanolamine can reach more than 70%, and the proportion of by-products is extremely low. Under this working condition, the reaction activation energy is low, the reaction rate is fast, the residence time is short, the effective utilization rate of raw materials is high, and there is almost no ineffective side reaction loss, which locks in the advantages of low cost and high production capacity from the reaction source. Under the working conditions, the subsequent secondary and tertiary addition reactions can be greatly inhibited, and the reaction thermodynamics and kinetics are completely biased towards the generation of single-substituted products. The one-way selectivity of monoethanolamine can reach more than 70%, and the proportion of by-products is extremely low. Under this working condition, the reaction activation energy is low, the reaction rate is fast, the residence time is short, the effective utilization rate of raw materials is high, and there is almost no ineffective side reaction loss. The advantages of low cost and high production capacity are locked in from the

There is a natural kinetic shortcoming in the synthesis of triethanolamine. Its generation must use monoethanolamine and diethanolamine as intermediate substrates, and continuous input of ethylene oxide is required to break the amino residual activity check point and complete the tertiary addition. This process not only requires the synthesis of triethanolamine to have a natural kinetic shortcoming. Its generation must use monoethanolamine and diethanolamine as intermediate substrates, and continuous input of ethylene oxide is required to break the amino residual activity check point and complete the tertiary addition. This process not only requires harsh working conditions of ethylene oxide excess, high temperature and long residence time ethylene oxide excess, high temperature and long residence time , but also the selective attenuation of each first-stage addition reaction step by step, and the third-stage reaction side reactions surge, easily generating polymeric by-products, hydroxyl impurities and colored intermediates. The whole reaction system belongs to a continuous consumption type series reaction, the raw material loss, energy consumption, and reaction time all increase exponentially, and the innate synthesis cost is much higher than that of monoethanolamine. The harsh working conditions, and the selectivity of each stage addition reaction decays step by step, and the third-stage reaction side reactions surge, making it easy to generate polymeric by-products, hydroxyl impurities and colored intermediates. The whole reaction system belongs to a continuous consumption series reaction, and the loss of raw materials, energy consumption, and reaction time all increase exponentially, and the innate synthesis cost is much higher than that of monoethanolamine.

2. Material mass transfer mechanism: the essential barrier to purification difficulty (the core invisible pain point of the industry) 2. Material mass transfer mechanism: the essential barrier to purification difficulty (the core invisible pain point of the industry)

The viscosity, water absorption and heat sensitivity problems mentioned in the original text are essentially the viscosity, water absorption and heat sensitivity problems mentioned in the original text of triethanolamine. The essence is the mass transfer separation barrier caused by the molecular structure polarity and hydrogen bond characteristics of triethanolamine Molecular structure polarity and hydrogen bond characteristics , which is also the core invisible reason for the difference in purification cost between the two. The monoethanolamine molecule contains only one hydroxyl group and one amino group, the molecular polarity is moderate, the number of hydrogen bonds is small, the system has low viscosity, weak hygroscopicity and excellent thermal stability. The volatile degree of the components under normal pressure and conventional negative pressure is very different, and the efficient separation can be achieved by ordinary distillation. The mass transfer resistance in the tower is small, there is no material decomposition loss, and the purification energy consumption and equipment operation and maintenance cost are extremely low The barrier of mass transfer and separation is also the core hidden reason for the difference in purification cost between the two. The monoethanolamine molecule contains only one hydroxyl group and one amino group, the molecular polarity is moderate, the number of hydrogen bonds is small, the system has low viscosity, weak hygroscopicity, and excellent thermal stability. The volatility of the components under normal pressure and conventional negative pressure is very different. Ordinary distillation can achieve efficient separation. The mass transfer resistance in the tower is small, there is no material decomposition loss, and the purification energy consumption and equipment operation and maintenance cost are extremely low.

The triethanolamine molecule contains three hydroxyl groups and one tertiary amine group, and the high-density hydrogen bond structure endows it with extremely strong hydrophilic water-locking ability. The triethanolamine molecule contains three hydroxyl groups and one tertiary amine group. The high-density hydrogen bond structure endows it with extremely strong hydrophilic water-locking ability. It is very easy to form an azeotropic association with the trace water of the system. It is very easy to form an azeotropic association with the trace water of the system. Conventional distillation cannot break the boiling and dehydrate. At the same time, its molecular weight is larger, the intermolecular force is extremely strong, and the viscosity at room temperature is 3 to 5 times that of monoethanolamine. The high-viscosity medium will greatly reduce the vapor-liquid mass transfer efficiency in the column, and it is prone to problems such as liquid flooding, deflection, and decay More importantly, triethanolamine is highly thermosensitive, and it is prone to thermal decomposition, oxidative discoloration, and formation of organic impurities when the temperature exceeds 120 ° C. Therefore, conventional distillation cannot break the boiling and dehydrate. At the same time, its molecular weight is larger, the intermolecular force is extremely strong, and the viscosity at room temperature is 3 to 5 times that of monoethanolamine. High viscosity media will greatly reduce the efficiency of vapor-liquid mass transfer in the tower, and are prone to problems such as liquid flooding, deflection, and decay of tray efficiency. More importantly, triethanolamine is highly thermosensitive, and it is prone to thermal decomposition, oxidative discoloration, and formation of organic impurities when the temperature exceeds 120 ° C. Therefore, it must be separated under ultra-high vacuum, low temperature, multi-stage precision distillation ultra-high vacuum, low temperature, and multi-stage precision distillation operating conditions, which requires extremely high equipment vacuum, tower interior precision, and temperature control system. Separation under working conditions requires extremely high equipment vacuum, tower interior precision, and temperature control system.

This physical difference directly causes the gap in equipment investment levels: monoethanolamine can be equipped with ordinary carbon steel distillation towers, and the equipment depreciation cost is low; triethanolamine needs to be equipped with high vacuum units, precision temperature control systems, and corrosion-resistant stainless steel distillation towers. The one-time investment in equipment, daily power consumption, and operation and maintenance costs have risen geometrically, which is the core hardware reason for its high price. This physical difference directly causes the gap in equipment investment levels: monoethanolamine can use ordinary carbon steel distillation towers, and the equipment depreciation cost is low; triethanolamine needs to be equipped with high vacuum units, precision temperature control systems, and corrosion-resistant stainless steel distillation towers. The one-time investment in equipment, daily power consumption, and operation and maintenance costs have risen geometrically, which is the core hardware reason for its high price.

III. Industrial coproduction economic model: capacity structure determines market supply and demand price difference III. Industrial coproduction economic model: capacity structure determines market supply and demand price difference

The global ethanolamine industry adopts the integrated production of the co-production process and the integrated production of the co-production process. There is no industrial plant that produces triethanolamine separately. This industrial pattern directly locks in the supply, demand and price levels of the two. The domestic ethanolamine production capacity structure shows obvious imbalance characteristics. Monoethanolamine is the core main product, and the production capacity accounts for nearly 60%. Second, diethanolamine, and triethanolamine production capacity accounts for only 14.7%., There is no industrial plant that produces triethanolamine separately. This industrial pattern directly locks in the supply, demand and price levels of the two. The domestic production capacity structure of ethanolamine shows obvious imbalance characteristics. Monoethanolamine is the core main product, and the production capacity accounts for nearly 60%, followed by diethanolamine, and the production capacity of triethanolamine accounts for only 14.7%, which is a typical scarce joint product.

The price difference between the two is not only due to production costs, but also from the price difference between the two. It comes from the quality premium of high-end application scenarios. The quality premium of high-end application scenarios , which is a key dimension that the industry is easily overlooked. Monoethanolamine is mostly used in industrial general scenarios such as fertilizer additives, desulfurization and denitrification, and basic synthesis. The industry purity requirements are mostly 99% industrial grade, with high impurity tolerance, no need for deep refining, and no additional quality premium., which is a key dimension that the industry is easily overlooked. Monoethanolamine is mostly used in industrial general scenarios such as fertilizer additives, desulfurization and denitrification, and basic synthesis. The industry purity requirements are mostly 99% industrial grade, with high impurity tolerance, no need for deep refining, and no additional quality premium.

Triethanolamine is the core raw material for daily chemicals, cosmetics, high-end additives, and precision electronic cleaning. Different application scenarios require extremely strict requirements for purity, chromaticity, moisture, and residual amine content. 85%, 97%, and 99% different purity grades of triethanolamine have a very high price layer. High-end pharmaceutical and cosmetic grade products need to completely remove trace monoethanolamine, diethanolamine, moisture, and colored impurities. After multi-stage distillation, post-processes such as adsorption decolorization, precision dehydration, and filtration and sterilization need to be added to further push up the refining cost and process threshold. Triethanolamine is the core raw material of daily chemicals, cosmetics, high-end additives, and precision electronic cleaning. Different application scenarios require extremely strict purity, chromaticity, moisture, and residual amine content. 85%, 97%, and 99% of different purity grades of triethanolamine have a great price layer. High-end pharmaceutical and cosmetic grade products need to completely remove trace monoethanolamine, diethanolamine, moisture, and colored impurities. After multi-stage distillation, post-processes such as adsorption decolorization, precision dehydration, and filtration and sterilization need to be added to further push up the refining cost and process threshold.

In addition, the storage stability of triethanolamine is far worse than that of monoethanolamine, and it is easy to absorb moisture, oxidize, and change color. Storage, transportation, and packaging all need to be sealed and moisture-proof, and inert gas protection. Logistics and storage loss costs are higher, further widening the end point price gap between the two. In addition, the storage stability of triethanolamine is far worse than that of monoethanolamine, and it is easy to absorb moisture, oxidize, and change color. Storage, transportation, and packaging need to be sealed and moisture-proof, and inert gas protection. Logistics and storage loss costs are higher, further widening the end point price gap between the two.

5. Industry core summary and exclusive cognition 5. Industry core summary and exclusive cognition

The price gap between monoethanolamine and triethanolamine is essentially the price gap between monoethanolamine and triethanolamine. The essence is chemical reaction selectivity, physical property mass transfer difficulty, industrial co-production structure, quality control threshold Chemical reaction selectivity, physical property mass transfer difficulty, industrial co-production structure, quality control threshold Four dimensions of hierarchical rolling. Monoethanolamine occupies the full-dimensional advantages of "easy reaction, simple purification, large production capacity, and low threshold", and is a standardized bulk basic chemical; while triethanolamine is limited by the congenital shortcomings of series reaction, hydrogen bond mass transfer barriers, coproduction scarcity properties, and high-end quality rigid demand. It belongs to high refining cost, low production elasticity, and high value-added fine chemicals. Four-dimensional hierarchical rolling. Monoethanolamine occupies the full-dimensional advantages of "easy reaction, simple purification, large production capacity, and low threshold", and is a standardized bulk basic chemical; while triethanolamine is limited by the congenital shortcomings of series reaction, mass transfer barriers of hydrogen bonds, scarcity properties of coproduction, and rigid demand for high-end quality. It is a fine chemical with high refining cost, low production elasticity, and high added value.

From the perspective of industry iteration trends, even if the current new processes such as microchannel reaction and green catalysis are gradually implemented, the selectivity of triethanolamine synthesis can be slightly improved, but the innate physical properties of its step-by-step addition and high viscosity are difficult to separate cannot be changed, and the price difference pattern between the two will exist for a long time. This price difference logic is also fully adapted to most fine chemical co-production systems: from the perspective of industry iteration trends, even if the current new processes such as microchannel reaction and green catalysis are gradually implemented, the selectivity of triethanolamine synthesis can be slightly improved, but the innate physical properties of its step-by-step addition and high viscosity are difficult to separate cannot be changed, and the price difference pattern between the two will exist for a long time. This price difference logic is also fully adapted to most fine chemical co-production systems: The more reaction stages, the more difficult the physical property separation, the lower the production capacity, and the higher the quality requirements of the joint product, the more significant the cost and price premium. The more reaction stages, the more difficult the physical property separation, the lower the production capacity, and the higher the quality requirements of the joint product, the more significant the cost and price premium , which is the core pricing law common in the chemical industry., is the core pricing law common in the chemical industry.

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