Amines methyl diethanolamine

Activated tertiary amines such as triethanolamine (TEA) and methyl diethanolamine (MDEA) have gained wide acceptance for CO2 removal. These materials require very low regeneration energy because of weak CO2 amine adduct formation, and do not form carbamates or other corrosive compounds (53). Hybrid CO2 removal systems, such as MDEA —sulfolane—water and DIPA—sulfolane—water, where DIPA is diisopropylamine, are aqueous alkaline solutions in a nonaqueous solvent, and are normally used in tandem with other systems for residual clean-up. Extensive data on the solubiUty of acid gases in amine solutions are available (55,56). 

For many years, nearly all the amine units were using monoethanola-mine (MEA) or diethanolamine (DEA). However, in recent years the use of tertiary amines such as methyl diethanolamine (MDEA) has increased. These solvents are generally less corrosive and require less energy to regenerate. They can be formulated for specific gas recovery requirements. 

Absorbents based on a variety of amines are by far the most common. Amines that have been used include monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), diisopropanolamine (DIPA), methyl diethanolamine (MDEA), and digly-colamine (DGA). C02 is typically absorbed at 80-140°F temperature and up to 1000 psig pressure by chemically reacting with the basic amine functional group in the absorbent, for example, primary amine, MEA, reacts with C02 by the following reaction forming a carbamate salt ... 

Resulf A process for removing residual sulfur compounds from refinery tailgases. They are hydrogenated to hydrogen sulfide, which is absorbed in an aqueous solution of an amine such as methyl diethanolamine. Licensed by TPA. 

UCAR [Union Carbide Carbon dioxide] A process for removing carbon dioxide from gas streams by scrubbing with methyl diethanolamine. Use of a proprietary corrosion inhibitor permits higher concentrations of the amine to be used than in similar processes. 

Irradiation in the presence of MDEA completely inhibits the formation of products. The amine quenches the fluorescence of Eosin with a rate constant of 8 x 108 M-1s-1 and quenches the Eosin triplet with a rate two orders of magnitude lower. A summary of rate constants for the decay of the triplet is presented in Table 8. In addition to the reactions shown in Scheme 3, with Am = (V-methyl diethanolamine, the rate constants for reaction of PDO with Eosin triplet and semioxidized Eosin radical in aqueous solution (Eqs. 19 and 20) are included in the table. 

The cooled process gas that leaves the Syngas Scrubber is fed to the Amine unit. The amine unit consists of an absorption-stripping system plus associated equipment. In this system a circulating amine stream (activated MDEA - or Methyl Diethanolamine) absorbs the C02 in the C02 Absorber. The amine is regenerated in the C02 Stripper with the C02 being recycled to the compressor. 

In an amine system, one way to increase absorption is to increase amine concentration. A higher amine concentration requires 1) more extensive filtration to keep the solution clean and 2) the addition of corrosion inhibitors and to minimize corrosion. Another option is to change from monoethanolamine (MEA) to methyl diethanolamine (MDEA)86. 

Hence, activated tertiary amines such as triethanolamine (TEA) and methyl diethanolamine (MDEA) have now gained wide acceptance for CO2 removal. These materials require very... 

METHYL DIETHANOLAMINE (105-59-9) C5H13NO2 Combustible liquid (flashpoint 259°F/126°C cc Fire Rating 1). Anorganic base. Reacts violently with oxidizers, acids, aliphatic amines, alkalis, ammonium persulfate, boranes, bromine dioxide. 

As coabsorption of CO2 leads to an increase in the size of the combined Claus and Scot system, it might be desirable to remove H2S as selectively as possible. Selective amine solutions are therefore used, normally diisopropanolamine (Dipa), or methyl-diethanolamine(MDEA) if CD2 contents are very high. 

Hydrogen abstraction by the excited triplet manifold of benzophenone, which is populated with quantum yields close to unity, from tertiary amines (AT-methyl diethanolamine) is depicted in reactions (32) and (33) [118]. 

Bis (hydrogenated tallow alkyl) dimethyl ammonium methyl sulfates. See Quaternium-18 methosulfate Bis hydrogenated tallowalkyl-2-hydroxypropyl amine CAS 71060-61-2 Uses Industrial surfactant Bis [2-(2-hydroxyethoxy) ethyl] ether. See PEG-4 N,N-Bis [2-(2-hydroxyethoxy) ethyl]-N-(2-hydroxyethyl) octadecanaminium chloride. See PEG-5 stearyl ammonium chloride Bis (2-hydroxyethyl) alkyl (C13-C15) amine. See PEG-2 C13-15 alkyl amine N,N-Bis(2-hydroxyethyl) almond fatty acid amide. See Almondamide DEA Bis (2-hydroxyethyl) amine N,N-Bis (2-hydroxyethyl) amine. See Diethanolamine... 

Amines AH methyl diethanolamine AH 2 triethylamine AH3 - ethyI-4-(dimethylamino)-benzoate AH 4 - bis-(2-hydioxy ethyl)-methylamine AH 5 - methyl-4-amino benzoate AHs 1,4-diazabicyclo [2.2.2] octane (DABCO) AHy - dimethylamine AHg - 2-(dimethyl aminoethyl)-benzoate AH9 - diethylanillne. 

Among the agricultural chemicals used for the cultivation of tobacco crops we find several amines, amides and carbamates. These include dimethyldodecylamine acetate (Penar), maleic hydra-zide-diethanolamine (MH-30), and carbaryl (Sevin) as a representative of the methyl urethanes (Figure 3 , 14), It is known that small quantities of these agents are found as residues in harvested tobacco (15). To date, only diethanolamine (DELA), the water-solubilizer for maleic hydrazide in MH-30, has been studied as a possible precursor for nitrosamines in tobacco and in tobacco smoke. In 1976, more than 1,400 metric tons of maleic hydrazide had been used on U.S. tobacco (16), most of which had been applied as the MH-30 formulation with diethanolamine (14,16). 

The most widely used amine is monoethanolamine (MEA), which is considered as a benchmark solvent because of its high cyclic capacity, significant absorption-stripping kinetic rates at low C02 concentration and high solubility in water. Some other amine-based solvents such as diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), N-methyldiethanol-amine (MDEA), piperazine (PZ), 2-amino-2-methyl-l-propanol (AMP) and N-(2-aminoeth-yl)piperazine (AEP) have also traditionally been utilised. 

Many amides have been prepared from pyrazinecarboxylic acid chlorides some are listed below with the relevant amines and references 2-chlorocarbonyl [MeNHj/ EtOAc (138) Me NH/EtOAc (138) BujNH etc/EtOAc (138) aniline/EtOAc (138, 1335) other aromatic and heterocyclic amines/EtOAc (138) sulfanilamide/ pyridine (1336) p-(2 -aminoethyl)benzenesulfonamide (1385) p-anisidine/benzene (1334) 4-hydroxypiperidine/benzene chloroform (1386) morpholine/DMF/20° (1387) 2-aminopyrimidine/benzene (1388) glycine/NaOH/ether (1201, cf. 1333, 1360)] 2-chlorocarbonyl-5-methyl [MeNHj/benzene (1337) MejNH/benzene (1337) 4-phenylpiperazine or diethanolamine/benzene-chloroform (1386) 2-chlorocarbonyl-3-phenyl (6-aminopenicillanic acid) (1024) 2-chloro-3-chloro-carbonyl (morpholine/benzene) (838) 2-chloro-5-chlorocarbonyl (NH4OH) (839) 2-chloro-6-chlorocarbonyl (Et2NH/benzene) (870, 1389) 2-chlorocarbonyl-5-hydroxy (aniline/benzene) (1055) 2-chlorocarbonyl-3-methoxy (morpholine/ benzene) (867) 2-chlorocarbonyl-5-methoxy (morpholine/benzene-chloroform) (1386) and 2-(l -chlorocarbonylethyI) (morpholine/benzene) (364). 

Diethyl 2-hydroxy-3-(phenylamino)propylphosphonate is fonned by the reaction of diethyl 2,3-epoxypropylphosphonate with aniline at 120°C, and diethyl 2-hydroxy-3-aminopropylphosphonate is produced by the reaction with aqueous ammonia at room temperature. Ring opening at C-3 is also achieved with secondary amines such as piperidine in MeOH at 25-65°C, diethylamine at 100°C, or diethanolamine or 1,2,4-triazole in methyl ethyl ketone at 50°C in presence of a base (K2CO3, NaHCOj, CsF, or 1C X ). 

The surface tension of binary mixtures of water + monoethanolamine and water + 2-amino-2-methyl-l-propanol and tertiary mixtures of these amines with water from 25 to 50°C have been reported. = The surface tension of aqueous solutions of diethanolamine and triethanolamine from 25 to 50°C have been analyzed. ... 

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