1,3-Propanediol propanal

Dihydroxypropane 1,2-Propylene glycol 2-Hydroxypropanol 2,3-Propanediol Propane-... 

Propanediol Propane-1,2-diol. See Propylene glycol 1,2(or 3)-Propanedk>l, 1-acrylate. See Hydrorypropyl acrylate Propane-1,2-diol alginate. See Propylene glycol alginate... 

A mixture of 22 grams of Oi-(p-chlorophenoxy)isobutyric acid, 3.8 grams of 1,3-propane-dioi, 0.5 gram of p-toiuenesulfonic acid and 150 ml of xylene was refluxed. When the theoretically calculated amount of water had been removed, the xylene solution was washed with dilute aqueous sodium bicarbonate and then the xylene was distilled off. The residue was distilled under reduced pressure to give 11 grams (47% yield) of 1,3-propanediol bis[a-(p-chlorophenoxy)isobutyrate] boiling at 197° to 200°C/0.03 mm Hg. 

Nitro-2-(m-nitrophenyl)-propanediol-1,3 Dinitrate (2-Nitro-2-(3,-nitrophenyl)-propane-... 

Nitro-2-(3-nitrophenyl)-propanediol-1,3-dinitrate (2-Nitro-2-(m-nitrophenyl)-propane-l, 3-diol-dinitrate). (02N)C6H4. C(N02) (CH20N02)2, mw 332, N 16 %, OB to C02 -57.8%, pale yel acicular prisms, mp 71—73.6°. Can be prepd by nitrating 2-nitro-2-(3 r-nitrophenyl)-propanediol-1, 3 with mixed nitric-sulfuric acid, as described in Ref 2, p 23. Sol in most common organic solvents... 

Propanediol (1,2-Propylene glycol, 1,2-Dihydroxy propane, Methyl glycol). CH3.CHOH.CH2OH mw 76.09 colorl, viscous, stable, hygr liq bp 187.3°, d 1.0381g/cc at 20/20° RI 1.4293 at 27° fl pt (open cup) 210°F autoignition temp 780°F. Misc with w, ales, and many org solvents in all proportions. Can be prepd by hydration of propylene oxide. On nitration it yields the exp] 1,2-Propanediol Dinitrate (see below)... 

As early as 1904, 1,2-Propanediol Dinitrate was proposed (Ref 3) as an additive to lower the freezing temp of NG, but its practical application on a large scale was hindered by lack of the raw material, propane-1,2-diol. It is only recently that the synthesis of glycol from ethylene led to the development of a method for producing methyl glycol from propylene via cnioro-hydrin. Even so, propylene-1,2-glycol is somewhat more expensive than glycols derived from ethylene (Ref 9)... 

In conclnsion, it was shown that the hydrogenolysis of glycerol in the presence of heterogeneous rhodium-based catalysts yielded mainly either 1,2-, or 1,3-propane diol. Many parameters influenced the activity and the selectivity of the catalysts, particnlarly the presence of metal additives and the initial pH value. 1,2-propanediol can be obtained nearly quantitatively at high pH. Further woik is currently under progress in order to optimize this reaction. 

The hydrogenation of 3-hydroxy propan al (HPA) to 1,3-propanediol (PD) over Ni/SiOi/AEO, catalyst powder was studied by Professor Hoffman s group at the Friedrich-Alexander University in Erlagen, Germany (Zhu et al., 1997). PD is a potentially attractive monomer for polymers like polypropylene terephthalate. They used a batch stirred autoclave. The experimental data were kindly provided by Professor Hoffman and consist of measurements of the concentration of HPA and PD (Chpa< Cpd) versus time at various operating temperatures and pressures. 

Table 6.4 Data for the Catalytic Hydrogenation of 3-Hydrox >propanal (HPA) to 1,3-Propanediol (PD) at 5.15 Mpa and80X4...

In contrast to Raney Ni, no hydrocarbons are formed over pure Raney copper, while propane-1,2-diol is produced with a selectivity of 66% at 85% glycerol conversion at 3 MPa and 513 K. It has been verified that the excellent selectivity is due to the high stability of propane-1,2-diol under the reaction conditions. 1,3-Propanediol is not stable and converts almost quantitatively into 1-propanol... 

A palladium phosphine complex [e.g., BCPE = l,2-bis(l,5-cyclooctylenephos-phino)ethane] was also reported to produce propanediols and n-propanol from glycerol at 443 K under 6 MPa CO/H2 atmosphere in acidic conditions, n-Propanol is the dominant product, while a slight preference for the formation of propane-1,3-diol is seen in the diol fraction. Reactions were performed at different temperatures in the range 413-448 K. Since acrolein was monitored at high temperature, a reaction network was proposed following a sequential dehydration/hydrogenation pathway [20]. 

Propanal, see Acrolein, Allyl alcohol. 2-Heptanone, 2-Pentanone, 1-Octene Propanamide, Acrylamide 1,2-Propanediol, see 1-Pentene, Propylene oxide... 

Polyethylene terephthalate is unsuitable for carpets because it crystallizes slowly and the fibers therefore break with time and wear. However, if EG is replaced by 1,3-propanediol, the fibers do not crystallize and wear resistance is greatly improved. The 1,2-diol has properties similar to EG. There are several routes to prepare this diol with reasonable selectivity from propane. 

Di(methylol)-propane Di(methylol dimethyl-methane Dimethyl-propanediol Bis(hydroxy-methyl)-propane or Pentaglycol (PGc) and Derivatives... 

Di(methylol) propane Dinitrate 2,2-Di(nitroxymethyl)-propane Pentaglycol Dinitrate 2,2-Dimethyl-l, 3-propanediol Dinitrate or D i meth y I ol dimethyl me thane Di nitrate, abbreviated as PGcDN,... 

Amino-2-metbyl-1 -propanediol 2-Ammo-2-meibyl-l, -dihydroxy-propane or Bis(hydroxymethyl )metbyl-aminometbane called in Beil /3-Amino-j8-methyl-trimethylenglykol), HO-CH,—C(NH )-CH. OH ... 

Trinitrophenyl-nitramino)-l,3-di nitro xy-propane or 2-(2, 4, 6 -Trinitro-phenylnitramino)-l,3-propanediol Dinitrate,... 

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