Glycol tri-ethylene

Under certain conditions of temperature and pressure, and in the presence of free water, hydrocarbon gases can form hydrates, which are a solid formed by the combination of water molecules and the methane, ethane, propane or butane. Hydrates look like compacted snow, and can form blockages in pipelines and other vessels. Process engineers use correlation techniques and process simulation to predict the possibility of hydrate formation, and prevent its formation by either drying the gas or adding a chemical (such as tri-ethylene glycol), or a combination of both. This is further discussed in SectionlO.1. 

In the mass spectra of di- and tri-ethylene glycol, the largest peak observed is at m/z 45. Because oxygen is present, an m/z 31 ion is also expected. 

In addition, water motion has been investigated in reverse micelles formed with the nonionic surfactants Triton X-100 and Brij-30 by Pant and Levinger [41]. As in the AOT reverse micelles, the water motion is substantially reduced in the nonionic reverse micelles as compared to bulk water dynamics with three solvation components observed. These three relaxation times are attributed to bulklike water, bound water, and strongly bound water motion. Interestingly, the overall solvation dynamics of water inside Triton X-100 reverse micelles is slower than the dynamics inside the Brij-30 or AOT reverse micelles, while the water motion inside the Brij-30 reverse micelles is relatively faster than AOT reverse micelles. This work also investigated the solvation dynamics of liquid tri(ethylene glycol) monoethyl ether (TGE) with different concentrations of water. Three relaxation time scales were also observed with subpicosecond, picosecond, and subnanosecond time constants. These time components were attributed to the damped solvent motion, seg-... 

H. Sashiwa, Y. Shigemasa, and R. Roy, Chemical modification of chitosan. 10.1. Synthesis of dendronized chitosan-sialic acid acid hybrid using convergent grafting of preassembled dendrons built on gallic acid and tri(ethylene glycol) backbone, Macromolecules, 34 (2001) 3905-3909. 

For instance, conductometric transduction has been used for determination of an atrazine herbicide in the concentration range 4.6-231.8 mM [165]. A sintered glass frit was used as the support for the MIP film prepared by thermo-radical polymerization. However, both the response time of 30 min and the chemosensor recovery time of 12 h were long. For better performance, the MIP film was prepared by photo-radical co-polymerization of a chloroform solution, which contained tri (ethylene glycol)dimethacrylate (TEGDMA), MAA, and oligourethane acrylate, sandwiched between two quartz slides (Table 6). 

S.S -Tetrahydroxy-S -tetramethyl spirobisindane (TTSBI) was depro-tonated with f-BuOK and polycondensed with di(ethylene glycol) tosylate or tri(ethylene glycol) tosylate as shown in Fig. 46. At concentrations of 0.1 or 0.2 mol/L no cross-linking was observed and multicyclic polyethers were isolated in high yields (up to 99%). The formed polymer was an amorphous character with two glass-transition temperatures [151]. 

P NMR study of the interaction of nucleotide derivatives with membranes was reported by Bunge et al.102 The authors have used oligonucleotides that are modified by covalent attachment of the cholesterol analogue cholesteryl tri(ethylene glycol) (cholesteryl-TEG) and spontaneously incorporate into lipid membranes. The influence of cholesteryl-TEG on the lipid membrane compared to that of cholesterol within bilayer structure is shown in Figure 26. 

Townsend A process for removing hydrogen sulfide from natural gas by absorption in tri-ethylene glycol containing sulfur dioxide. Part of the sulfur produced is burned to sulfur dioxide in order to provide this solution. The hydrogen sulfide and sulfur dioxide react in the presence of water to generate elemental sulfur. Invented in 1958 by F.M. Townsend piloted in Canada but never commercialized. 

Polyethylene glycol having a Mn of 3400 daltons (1.47 mmol) and p-toluene sulfonic acid (0.012 g) were added to a 100-ml flask and heated to 80°C to 90°C for 3 hours at 0.5 to 1.0 torr. The mixmre was cooled and treated with the Step 1 product (1.47 mmol) and 10.0 ml of THF it was further treated with divinyl tri(ethylene glycol) (2.94 mmol) in 10 ml of THF. This reaction mixture was stirred for 2 hours at ambient temperature and then treated with 0.3 ml triethylamine. The reaction mixture was precipitated in 100 ml of hexane, and the product was isolated having aM of 25,000 daltons. 

C9H180 trans-2-propylcyclohexanol 5846-43-5 456.62 39.732 2 18103 C9H1804 tri(ethylene glycol) methyl vinyl ether 26256-87-1 515.15. 342 1,2... 

---