Adipinic acid

ADIPIC ACID Adipinic Acid, 1,4 -Butane-dicarboxylic Acid, Hexanedioic Acid 1 1 0 ... 

Measurements have been carried out for an industrial NOx absorption process [74], The absorption plant (Fig. 9.8) represents a sequence of four units used for the removal of nitrogen oxides from the waste gas of an adipin acid factory. Each unit is separated into two sections, thus, there are altogether eight columns of 2.2 m diameter and 7 m height each, which are connected countercurrently. To enhance the mass transport in the columns, 35 mm INTALOX ceramic saddles with a packed bed height of 3.2 m are used. The plant is operated at atmospheric pressure. 

ADIPIC ACID AND DERIVATIVES Adipic or Adipinic Acid (Hexanedioic or... 

SYNS ACIFLOCTIN ACINETTEN ADILACTETTEN ADIPINIC ACID 1,4-BUTANEDICARBOXYLIC ACID FEMA No. 2011 Dl,6-... 

Figure 1 KBr transmission spectrum of polystyrene resin (lower curve) and of polystyrene resin loaded with adipinic acid monoamide (upper curve). The carbonyl bands of the acid (at 1720 cm-1) and of the amide (at 1650 cm-1) are clearly seen in the overlay plot. The spectra were obtained, in the 4000-400 cm 1 range with 32 scans at 2 cnr1 resolution, by means of a Bruker IFS 66 spectrophotometer.

Furthermore, the internal reflection spectra of these reactions are much less distorted by the absorption bands of the solid support than are the transmission spectra recorded from KBr pellets made of polystyrene or TentaGel beads. In Fig. 3 the spectra of polystyrene resin (upper curve) and of a polystyrene Mega Crown (lower curve), both loaded with adipinic acid monoamide, are shown. The disturbing polystyrene bands are marked P. ... 

The first use of this method for the monitoring of solid-phase reactions was described by Yan et al. [20]. Polystyrene hydroxymethyl resin as starting material was reacted with adipinic acid chloride and dipropargyle amine (Fig. 16.7). 

ADIPINIC ACID (124-04-9) Dust may form explosive mixture with air (flash point 385°F/196°C). Contact with strong oxidizers may cause fire and explosions. Incompatible with sulfuric acid, caustics, ammonia, aliphatic amines, alkanolamines, isocyanates, alkylene oxides, epichlorohydrin. Flow or agitation of substance may generate electrostatic charges due to low conductivity. 

Synonyms cas 124-04-9 acifloctin acinetten adilactetten adipinic acid i,4-butanedicarboxylic acid... 

LCCC. The diacid was AD (adipinic acid, also known as adipic acid) and the two diols were NPG (neopentylg-lycol) and HD (hexanediol). The diols were in molar excess and implies that almost all chains are terminated with a diol. More specifically, there will be three types of copolyester chains, namely chains terminated by NPG on both sides, chains terminated by NPG on one side and HD on the other side, and chains terminated by HD on both sides. In formulas, NPG-COP-NPG, HD-COP-NPG, and HD-COP-HD, where COP = -(AD-NPG)n - AD-HD)m - AD-. Figure 45.21 reports the LCCC trace. It displays four bands denoted by PI, P2, P3, and P4. The MALDI spectrum of PI revealed they were cycles. Inspection of MALDI spectra of P2, P3, and P4 revealed that ions are due to NPG-COP-NPG, HD-COP-NPG, and HD-COP-HD. In practice, LCCC was powerful enough to separate the polymeric chains by functionality. 

Polyamide is a polymer formed from condensation of dicarbonic acids and diamines or from condensation of amino acids and lactames. In publications, in English, polyamids are called nylon. To distingmsh them from one another a number is added that represents the number of C-atoms of the monomer or monomers. Nylon type 6.6 (polyamide 6.6) is the most common commercial grade of nylon. It consists of hexamethylene diamine and adipinic acid. 

Addition reactions proceed typically at unsaturated bonds such as C=C, C=0, C=N, C=N or carbon-carbon triple bonds. A molecule is added to the substrate and the product forms without release of any another molecule. With all substrates becoming part of the product, the atom economy of addition reactions is very favorable. Because today s chemical technology is largely based on unsaturated base chemicals obtained in the steam cracker process (e.g., ethylene, propylene, butenes, benzene, see Chapter 6.6), addition reactions are of the highest relevance in the whole petrochemistry. Scheme 2.2.2 shows as one important example, namely, the addition of hydrogen to benzene to form cyclohexane, a key intermediate in the production of, for example, adipinic acid or caprolactam (nylon). 

Adipinic acid, s-caprolactam Glycerol, allyl ether, allyl ester... 

Adipinic acid is produced industrially by oxidation of cyclohexane in a multistep oxidation process with cyclohexanol/cyclohexanone as important intermediates. The process operates at 125-165 °C and 8-15bar and uses 50-65% nitric acid as the oxidant. As coupling product of the oxidation dinitrogen oxide (N2O) is formed that has to be removed from the process flue gas due to its ozone layer depletion effect and its very high global warming potential (298 times that of CO2). The reaction is catalyzed by vanadium and copper salts and reaches product yields of 96%. 

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