MDEA

That means that this method is a neat little way one can get the ever lovely MDEA (Methylenedioxyethyl amphetamine, the softer cousin of X). Strike hears you asking So if one uses lithium tri-methylborohydride can one get methamphetamine out of that nitro group . Good question. Unfortunately the answer is no. The authors say Interestingly, N-alkylated products were not produced when other alkylborohydrides were used." Fair enough. Here s the recipe ... 

Isopropmolamine global capacity for 1989 was estimated at 37,000 t. U.S. capacities for isopropano1 amine (IPA), aminoetbyletbano1 amine (AEEA), and methyldietbano1 amine (MDEA) are as follows ... 

Methyl dietb an olamine (MDEA) and solutions of MDEA have increased in use for gas treating (150,151). Additional gas treating capacity can often be obtained with the same working equipment, because of the higher amine concentrations that can be used. 

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). 

The original hot carbonate process developed by the U.S. Bureau of Mines was found to be corrosive to carbon steel (55). Various additives have been used in order to improve the mass transfer rate as well as to inhibit corrosion. Vetrocoke, Carsol, Catacarb, Benfteld, and Lurgi processes are all activated carbonate processes. Improvements in additives and optimization of operation have made activated carbonate processes competitive with activated MDEA and nonaqueous solvent based systems. Typical energy requirements are given in Table 9. 

MEA with inhibitors potassium carbonate potassium carbonate and regenerator(s) activated MDEA and regenerator(s)... 

The selected popular processes are grouped as follows Reaction type MEA, DEA, MDEA, DGA, Stretford (also produces sulfur)... 

MDEA is preferred for seleetive H2S removal and lack of degradation from COS and CS2. 

MEA = Monoethanol amine DEA = Diethanol amine MDEA = Methydiethanol amine... 

Performs preliminary design of MliA, DliA, and MDEA plants through mass and energy balance calculations for all major equipment involved. 

A chain extender could be selected from the following compounds ethylene glycol, 1,2-propanediol, 1,4-butanediol, 1,3-butanediol, neopentanediol, hexanediol, methyl-dihydroxylethyl amine (MDEA) [9], etc. These should be as dry as possible. 

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. 

MDEA has effects similar to those of MDMA. MDEA appeared on the market following restrictions placed on MDMA. 

Death after the use of MDMA or MDEA is rare but may occur because of induction of cardiac arrhythmias or as a consequence of risk-taking behavior. Following its acute effects, MDMA may produce symptoms such as anxiety, depression, and confusion, which, in some cases, continue for several weeks (Dowling et al. 1987). 

The threshold dose of MDMA is 30 mg, but the average dose is 80-150 mg, with some users taking in excess of 200 mg. The lethal dose is estimated (from animal data) to be approximately 6,000 mg. On the street, concentrations of MDMA can vary greatly, and tablets may also contain other substances such as methylenedioxyamphetamine (MDA) and methylenedioxy-ethylamphetamine (MDEA) (Sherlock et al. 1999). The presence of these other substances is often associated with emergency presentations because of their narrower therapeutic windows. 

A report of five deaths associated with the use of MDEA and MDMA. JAMA 257 1615-1617, 1986. 

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. 

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