Триэтиламин

Химические свойства

Триэтиламин, этот реактив также называют Диэтиламиноэтан или ТЭА — это третичный амин (С2H5)3N. При комнатной температуре представляет собой бесцветную жидкость, имеющую сильный рыбный запах, напоминающий аммиачный. Триэтиламин ограниченно растворим в воде (нижняя критическая точка при T=19,1 °C и 31,6 % вес. триэтиламина), при этом хорошо растворим в ацетоне, смешивается с этанолом. Триэтиламин коррозионно-агрессивен в отношении алюминия, цинка, меди и их сплавов в присутствии влаги, также для некоторых видов пластика, резины и полимерных покрытий, поэтому хранится в стальных ёмкостях.

Применение

В промышленности триэтиламин используется в первую очередь в качестве элемента органического синтеза, при изготовлении фармацевтических препаратов, для антикоррозионных рецептур. С его помощью проводится катализ образования пенополиуретана и многих видов эпоксидных смол, применяется при производстве некоторых видов ракетного топлива. В общем смысле широко применяется, как компонент для производства лекарств, гербицидов, минеральных удобрений, красок, каучуков, смол. Литейная отрасль и металлопрокат нашли триэтиламин эффективным для выпуска стержней в комплексе COLD-BOX-AMIN процесса. Кроме этого, триэтиламин помогает производителям пластиков различных видов.

Химические свойства

Triethylamine is a colorless to yellowish liquid with a strong ammonia to fish-like odor. It is a base commonly used in organic chemistry to prepare esters and amides from acyl chlorides. Like other tertiary amines,it catalyzes the formation of urethane foams and epoxy resins.

Физические свойства

Clear, colorless to light yellow flammable liquid with a strong, penetrating, ammonia-like odor. Experimentally determined detection and recognition odor threshold concentrations were <400 μg/m³ (<100 ppb_v) and 1.1 mg/m³ (270 ppb_v), respectively (Hellman and Small, 1974). An odor threshold concentration of 0.032 ppb_v was determined by a triangular odor bag method (Nagata and Takeuchi, 1990).

Использование

Triethylamine is a base used to prepare esters and amides from acyl chlorides as well as in the synthesis of quaternary ammonium compounds. It acts as a catalyst in the formation of urethane foams and epoxy resins, dehydrohalogeantion reactions, acid neutralizers for condensation reactions and Swern oxidations. It finds application in reverse phase high-performance liquid chromatography (HPLC) as a mobile-phase modifier. It is also used as an accelerator activator for rubber, as a propellant, as a corrosion inhibitor, as a curing and hardening agent for polymers and for the desalination of seawater. Furthermore, it is used in the automotive casting industry and the textile industry.

Определение

ChEBI: Triethylamine is a tertiary amine that is ammonia in which each hydrogen atom is substituted by an ethyl group.

Методы производства

Triethylamine is prepared by a vapor phase reaction of ammonia with ethanol or reaction of N,N-diethylacetamide with lithium aluminum hydride (Windholz et al 1983). It may also be produced from ethyl chloride and ammonia under heat and pressure (Hawley 1981) or by vapor phase alkylation of ammonia with ethanol (HSDB 1988). U.S. production is estimated at greater than 22,000 tons in 1972 (HSDB 1988).

прикладной

Triethylamine (TEA, Et3N) is an aliphatic amine. It is used to catalytic solvent in chemical synthesis; accelerator activators for rubber; wetting, penetrating, and waterproofing agents of quaternary ammonium types; curing and hardening of polymers (e.g., corebinding resins); corrosion inhibitor; propellant.
Triethylamine has been used during the synthesis of:
5′-dimethoxytrityl-5-(fur-2-yl)-2′-deoxyuridine
3′-(2-cyanoethyl)diisopropylphosphoramidite-5′-dimethoxytrityl-5-(fur-2-yl)-2′-deoxyuridine
polyethylenimine600-β-cyclodextrin (PEI600-β-CyD)
It may be used as a homogeneous catalyst for the preparation of glycerol dicarbonate, via transesterification reaction between glycerol and dimethyl carbonate (DMC).

Безопасность

Концентрационный предел воспламенения = 1,2—8 % по объёму. При горении выделяет раздражающие и токсичные вещества.
При испарении взрывоопасен.
Токсичен. Проникает через кожу. При попадании внутрь организма вызывает сильное отравление. Раздражает дыхательные пути, глаза и кожу, при прямом контакте может вызвать сильный ожог. ПДК=10 мг/м 3

Производство

Производство триэтиламина, как и этиламина, диэтиламина осуществляется при парофазном аминировании такого вещества, как этанол аммиаком над парами оксида алюминия (Al2O3) или оксида кремния (SiO2) при температуре от трехсот пятидесяти до четырехсот пятидесяти градусов и давлении от двадцати до двухсот атмосфер. В состав получаемой смеси могут входить примеси, которые будут зависеть от исходного соотношения вещества-реагента.

Общее описание

Triethylamine appears as a clear colorless liquid with a strong ammonia to fish-like odor. Flash point 20°F. Vapors irritate the eyes and mucous membranes. Less dense (6.1 lb / gal) than water. Vapors heavier than air. Produces toxic oxides of nitrogen when burned.

Профиль реактивности

Triethylamine reacts violently with oxidizing agents. Reacts with Al and Zn. Neutralizes acids in exothermic reactions to form salts plus water. May be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Flammable gaseous hydrogen may be generated in combination with strong reducing agents, such as hydrides.

Угроза здоровью

Vapors irritate nose, throat, and lungs, causing coughing, choking, and difficult breathing. Contact with eyes causes severe burns. Clothing wet with chemical causes skin burns. Triethylamine may also be irritating to skin and mucous membranes (Windholz et al 1983).

Пожароопасность

Flammable/combustible material. May be ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

Транспортировка

Высокая степень воспламеняемости триэтиламина определяет основные условия, при которых его наиболее безопасно перевозить. Транспортировка производится при обеспечении безударного закрепления емкостей, необходимо соблюсти все условия перевозки легковоспламеняющихся и взрывчатых изделий.

Промышленное использование

Triethylamine is used as an anti-livering agent for urea- and melamine-based enamels and in the recovery of gelled paint vehicles (HSDB 1988). It is also used as a catalyst for polyurethane foams, a flux for copper soldering, and as a catalytic solvent in chemical synthesis (Hawley 1981). Triethylamine is used in accelerating activators for rubber; as a corrosion inhibitor for polymers; a propellant; wetting, penetrating, and waterproofing agent of quaternary ammonium compounds; in curing and hardening of polymers (i.e. core-binding resins); and as a catalyst for epoxy resins (Hamilton and Hardy, 1974).

Профиль безопасности

Moderately toxic by ingestion and skin contact. Mildly toxic by inhalation. Human systemic effects: visual field changes. Experimental reproductive effects. Mutation data reported. A skin and severe eye irritant. Can cause kidney and liver damage. A very dangerous fire hazard when exposed to heat, flame, or oxidizers. Explosive in the form of vapor when exposed to heat or flame. Complex with dinitrogen tetraoxide explodes below 0°C when undduted with solvent. Exothermic reaction with maleic anhydride above 150°C. Can react with oxidzing materials. Incompatible with N2O4. To fight fire, use CO2, dry chemical, alcohol foam. When heated to decomposition it emits toxic fumes of NOx.

Возможный контакт

Triethylamine is and aliphatic amine used as a solvent; corrosion inhibitor; in chemical synthesis; and accelerator activators; paint remover; base in methylene chloride or other chlorinated solvents. TEA is used to solubilize 2,4,5-T in water and serves as a selective extractant in the purification of antibiotics. It is used to manufacture quaternary ammonia compounds and octadecyloxymethyltriethylammonium chloride; an agent used in textile treatment.

Канцерогенность

TEA was not mutagenic in bacterial assays, but it did cause aneuploidy and chromosome aberrations in rats.

Экологическая судьба

Photolytic. Low et al. (1991) reported that the photooxidation of aqueous tertiary amine solutions by UV light in the presence of titanium dioxide resulted in the formation of ammonium and nitrate ions.
Chemical/Physical. Triethylamine reacted with NOx in the dark to form diethylnitrosamine. In an outdoor chamber, photooxidation by natural sunlight yielded the following products: diethylnitramine, diethylformamide, diethylacetamide, ethylacetamide, diethylhydroxylamine, ozone, acetaldehyde, and peroxyacetyl nitrate (Pitts et al., 1978).

Метаболизм

There have been few studies on the metabolism of industrially important aliphatic amines such as triethylamine. It is generally assumed that amines not normally present in the body are metabolized by monoamine oxidase and diamine oxidase (histaminase).
Ultimately ammonia is formed and will be converted to urea. The hydrogen peroxide formed is acted upon by catalase and the aldehyde formed is thought to be converted to the corresponding carboxylic acid by the action of aldehyde oxidase (Beard and Noe 1981).

Перевозки

UN1296 Triethylamine, Hazard Class: 3; Labels: 3-Flammable liquid, 8-Corrosive material.

Методы очистки

Dry triethylamine with CaSO4, LiAlH4, Linde type 4A molecular sieves, CaH2, KOH, or K2CO3, then distil it, either alone or from BaO, sodium, P2O5 or CaH2. It has also been distilled from zinc dust, under nitrogen. To remove traces of primary and secondary amines, triethylamine has been refluxed with acetic anhydride, benzoic anhydride, phthalic anhydride, then distilled, refluxed with CaH2 (ammonia-free) or KOH (or dried with activated alumina), and again distilled. Another purification method involved refluxing for 2hours with p-toluenesulfonyl chloride, then distilling. Grovenstein and Williams [J Am Chem Soc 83 412 1961] treated triethylamine (500mL) with benzoyl chloride (30mL), filtered off the precipitate, and refluxed the liquid for 1hour with a further 30mL of benzoyl chloride. After cooling, the liquid was filtered, distilled, and allowed to stand for several hours with KOH pellets. It was then refluxed with, and distilled from, stirred molten potassium. Triethylamine has been converted to its hydrochloride (see brlow), crystallised from EtOH (to m 254o), then liberated with aqueous NaOH, dried with solid KOH and distilled from sodium under N2. [Beilstein 4 H 99, 4 I 348, 4 II 593, 4 III 194, 4 IV 322.]

Несовместимости

A strong base. Violent reaction with strong acids; halogenated compounds; and strong oxidizers. Attacks some forms of plastics, rubber and coatings. Corrosive to aluminum, zinc, copper, and their alloys in the presence of moisture. Reaction with nitrosating agents (e.g., nitrites, nitrous gases, and nitrous acid) capable of releasing carcinogenic nitrosamines.

Утилизация отходов

Controlled incineration (incinerator equipped with a scrubber or thermal unit to reduce nitrogen oxides emissions).