Basic properties of tertiary amines

Carbon dioxide capture is one of the important ways to achieve carbon reduction. CO2 capture technology mainly includes physical absorption method, membrane separation method, chemical absorption method, etc. Among them, chemical solvent absorption method is the oldest and more mature and widely used decarbonization method. The chemical absorption method utilizes the acidic characteristics of CO2, uses an alkaline solution for acid-base chemical reaction absorption, and then realizes the regeneration of the solvent by means of the reverse reaction. Although strong bases such as K2CO3 can also be used as a solvent and can be heated for regeneration, this solvent is seriously corrosive to the system. The industrial chemical absorption method mainly uses the aqueous solution of organic alcohol amines as the absorbent, and uses the absorption tower and the regeneration tower to form a system to capture CO2. Several alcohol amines commonly used in industry are primary amine MEA (monoethanolamine), secondary amine DEA (diethanolamine) and tertiary amine MDEA (N-methyldiethanolamine) and TEA (triethanolamine). Various amines have their own advantages and disadvantages for CO2 capture. Primary amines and secondary amines have fast absorption rates, but are easy to generate relatively stable carbamates and have a low degree of regeneration; tertiary amines have good regeneration performance, but the absorption rate is slow. Mixed amine absorption liquid can play the advantages of single-component organic amines and make up for the shortcomings, and composite absorbents with high efficiency and low consumption are the development trend of absorbents.
MEA is the earliest and most widely used absorbent for industrial production. Optimizing MEA absorbent is one of the current concerns. As far as absorbent performance is concerned, "high efficiency and low consumption" mainly refers to high absorption and low energy consumption (that is, high regeneration performance). In view of the high regeneration performance of tertiary amines, which can make up for the shortcomings of MEA in this regard, mixed amine (MEA/tertiary amine) absorbents composed of MEA and tertiary amines have received extensive attention. These studies mainly focus on the mass transfer process of CO2 absorption ( kinetics) study. For the capture performance research, the tertiary amines are mainly studied on MDEA and TEA, and the remaining tertiary amines are less studied.

Introduction of Fatty Acid Chloride

Characteristics of Secondary Amines

Introduction of Fatty Acid Chloride

Characteristics of Secondary Amines

The catalysts commonly used in the synthesis of polyurethane and its raw materials mainly include tertiary amine catalysts and organometallic compounds. There are many varieties of tertiary amines and organometallic compounds. Considering various factors, only more than 20 are most commonly used in polyurethane production.

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Physical and chemical properties of amides

Except for formamide, which is liquid, other amides are mostly colorless crystals, and monoalkyl-substituted amides are often liquid. Due to the strong intermolecular hydrogen bonding ability of amide molecules and the large polarity of amide molecules, its melting and boiling point is even higher than that of carboxylic acids with similar molecular weights. When the hydrogen atom on the amino group is replaced by a hydrocarbyl group, its melting and boiling point is also reduced due to the reduction of the intermolecular hydrogen bond association.

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Physiological role of polyamines

1. Promote growth, improve seed vigor and germination ability; 2. Stimulate the production of adventitious roots and promote the absorption of inorganic ions by the root system; 3. Inhibit the increase of protease and RNase activity, delay leaf senescence, and delay the decomposition of chlorophyll; 4. Regulate the growth and morphogenesis related to phytochrome, and regulate the flowering process; 5. Improve stress resistance and osmotic stress resistance.

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Amine ether production method and use

Production methods There are many synthetic methods, mainly: (1) sodium dimethylamino ethoxide and SO3 or chlorosulfonic acid reaction; (2) trimethylamine reacts with dichloroethyl ether or dimethylamino ethoxyethyl ether; (3) Dimethylamine and ethylene acetal were synthesized in the next step of solid catalyst. Mainly used as catalyst for polyurethane foam.

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Physicochemical properties of amine oxides

Water solubility: due to the polar bond N → 0 in the amine oxide molecule, the dipole moment is 4138D, so the compound has the characteristics of high polarity and high melting point, and is easily soluble in polar solvents such as water and low-carbon alcohols , while insoluble in non-polar solvents such as mineral oil and benzene. In aqueous solution, amine oxides exist in the form of hydrate (R1R2R3NO · XH2O) in large quantities, but with the change of pH value, the polarity will change.

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Introduction of Fatty Acid Chloride

Fatty acid chloride Derivatives in which the hydroxyl group on the carboxyl group of fatty acid is replaced by chlorine. It is prepared by the reaction of fatty acid and phosphorus trichloride. As an acylating agent, it is used to prepare surfactants in which hydrophobic groups are connected with carboxyl groups through intermediate bonds.

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