Cyclohexylamine carbonate

For example, isobutanolamine (IBA, 2-amino, 3-methyl, 1-propanol, AMP) forms a carbonate (IBA carbonate) that is soluble to the extent of 38% w/w at 25 °C, whereas cyclohexylamine carbonate is only soluble to the extent of 10.5% at 25 °C. This difference in solubility and lack of any significant carbonate stability may result in the fouling of steam traps at the end of long runs of condensate line. 

Langwell Vapor Phase Deacidification Process. Langwell s VPD process is a very simple process. Cyclohexylamine carbonate is inserted between book pages to achieve partial deacidification. However, this process does not create an alkaline reserve in treated products to prevent future acid attack. Cyclohexylamine carbonate will react with some plastic covers, inks and colors. Preselection of books is required. The odor and the carcinogenic nature of the vapor are also critical factors that limit the use of VPD process as a mass deacidification process (46-54). 

Cyclohexylamine carbonate, morpholine, amines in general and ammonia itself have all been considered as deacidifying treatments. Many are liquids with a significant vapour pressure or are gases, which makes them potentially useful for mass processes. However, all suffer from the problem that the deacidification produced is not permanent and some cause yellowing of the paper. None is currently in favour. 

Cyclohexylamine carbonate [(C6Hii)NH2]2- H2CO3 White powder 0.5 (poured)... 

Carbonic acid, compd. with cyclohexanamine Carbonic acid, compd. with cyclohexylamine. See Cyclohexylamine carbonate Carbonic acid, compd. with guanidine (1 2). See Guanidine carbonate Carbonic acid, cyclic ethylene ester. See Ethylene carbonate... 

Verton MFX. See Polypropylene Vertral 4/021280. See Octahydro-4,7-methano-1 H-indenecarbaldehyde Vertraldehyde. See Veratraldehyde Vertrel XF. See 2,3-Dihydrodecafluoropentane Verv . See Calcium stearoyl lactylate Vervain, European, extract Vervain extract. See Verbena officinalis extract Verzone Crystal No. 120. See 1H-Benzotriazole Verzone Crystal No. 130. See Cyclohexylamine carbonate... 

Cyclohexylamine carbonate Verzone Crystal No. 130 20246-55-3 Tripalmitolein 20246-69-9 Amyl Cad mate ,... 

It is well known, and shown in potential-pH diagrams, that an alkalization of the corrosive medium has a beneficial effect on the corrosion resistance of some metals, notably ferrous metals. Cyclohexylamine and dicyclohexylamine are moderately strong bases (pZa = 10.66 and 11.25, respectively). The pH of the solutions of their salts with weak acids will depend on the pi a of the acid. For example, cyclohexylamine carbonate will have a rather alkaline pH (pZa for carbonic acid 6.37), whereas dicyclohexyl ammonium nitrite will have a neutral pH (pFCa = 3.37 for nitrous acid). Guanidine is a strong base (pZa = 13.54) and is mainly used as an additive in VCI formulations to adjust the alkalinity. Buffers (sodium tetraborate, etc.) may have to be used to maintain the pH of a VCI formulation at a convenient level. 

In the case of nitrobenzoates, for example, it has been claimed that an acceleration of the cathodic partial process by reduction of the nitro group may lead, in addition to the effect of oxygen in the thin electrolyte layer, to a complete passivation of iron or ordinary steels. Contributions from the two parts of the dissociated molecule to the inhibitive effect is very likely and explains a synergistic effect of the inhibitor at the cathodic and anodic sites, as was suggested long ago. For example, it was shown by autoradiographic studies that the dissociation products of cyclohexylamine carbonate act separately on anodic and cathodic sites, with the former effect predominating. 

Note that the vapor pressure of cyclohexylamine carbonate is 2000 times higher than dicyclohexylamine nitrite, thus making it a better choice for containers that are opened occasionally because it will resaturate the vapor space rapidly. Dicyclohexylamine nitrite is advantageous for once-opened containers that may be stored for extended periods. The amount of VPI required depends on conditions. 

Cyclohexylamine carbonate 0.4 Protects steel, aluminum, solder, tin, and size. No effect on cadmium, increases corrosion of copper, brass, and magnesium. 

Vapor phase inhibitors (VPIs) can be placed in a package in bulk or by wrapping an article in paper impregnated with a VPl. These compounds are volatile organics, so the package in which they are used must be fairly well sealed. The most common VPIs in use are dicyclohexylamine nitrite (DHN) and cyclohexylamine carbonate (CHC). These inhibitors are very effective for steel, but they should be tested if metals other than steel are present because they attack some non-ferrous metals. 

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