Benzene in triethylene glycol

The reaction represented is that with hydrazine solution, produced from hydrazine sulphate and sodium acetate in the presence of aqueous alcohol. Excellent results are also obtained by interaction of the commercially available 60-64 per cent, hydrazine solution with a solution of 2 4 dinitrochloro-benzene in triethylene glycol or in diethylene glycol at about 20°. 

C8H12 methylnorbornene 694-92-8 gas 1 508 2 15591 C8H1804 triethylene glycol dimethyl ether 112-49-2 in benzene 2.239 1... 

The most significant solvent effects are in the small list of water-soluble, protonic solvents. Trichloroacetic acid, a liquid at the temperature of the benzene boiler, takes the lead with a reaction time of only 1.2 hrs. By contrast, the reaction time for triethylene glycol (No. 51) was 8 hrs. Dichloroacetic, trichloroacetic, and trifluoro-acetic acid all promote rapid reaction but they also give rise to extraneous pigments in the reaction mixture. 

With triethylene glycol at 121.5°C (Figure 10) the results are better. In this case the solvent contains 5% water, and its boiling point is about 140°C. This solvent is also very selective, and the extracts have low heptane solubilities. Benzene distributes in a ratio just under 1 to 2 between extract and raffinate. Triethylene glycol has nearly twice the... 

Removal of Aromatic Compounds. Because of the demand for high-purity aromatic compounds for petrochemical feedstocks, several processes have been developed for BTX (benzene, toluene, and xylenes) recovery from distillate streams. In these processes, aromatic compounds are separated from nonaromatic compounds by liquid—liquid extraction using polar solvents. The three major processes in use are the UOP—Dow UDEX process (di- or triethylene glycol solvent), the UOP sulfolane process (tetrahydrothiophene 1,1-dioxide), and the Union Carbide TETRA process (tetraethylene glycol). 

Ineluded in this sequence are reactions such as the hydration of ethylene oxide to mono-, di-, and triethylene glycol, chlorination of benzene to mono-, di-, and trichlorobenzene (similarly with nitration), etc. Since we are going to consider these as elementary steps, order corresponds to stoichiometry and the rate constants follow the Arrhenius law. 

In gas dehydration service, triethylene glycol (TEG) will absorb limited quantities of BTEX from the gas. Based on literature data, predicted absorption levels for BTEX components vary from 5-10% for benzene to 20-30% for ethylbenzene and xylene [2]. Absorption is fa vored at lower temperatures, increasing TEG concentration and circulation rate. The bulk of absorbed BTEX is separated from the glycol in the regeneration unit and leaves the system in the regenerator overhead stream. 

Monomers a,(y-dimethacrylbis (triethylene glycol) phthalate (MGP) or trioxyethylene a,o>-dimethacrylate (TMA) were polymerized with Na-naphthalene. Styrene and divinyl benzene were swollen in, and the reaction continued. Network I is densely crosslinked under these conditions. 

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