Synthesis of propylene oxide from propylene …

i) the manufacture of synthesis gas (a mixture of carbon monoxide and hydrogen (steam reforming))

Catalytic Synthesis of Propylene Carbonate from CO2 …

A few examples of polyether polyols based on propylene and ethylene oxides, used in different applications, are shown in Table 1.5.

Electrocatalytic synthesis of propylene oxide during …

Epoxidation of propylene with hydrogen peroxide (HP) is regarded as an attractive route to propylene oxide (PO) since it does not produce byproducts as conventional PO technologies do, but relatively high market prices, limited supply and toxic nature of the HP have been an obstacle to the route’s commercial acceptance. However, recent developing technologies involving onsite HP production followed by HP conversion to PO without refining are being looked over as promising technologies with good potentials for savings in PO capital and production costs. Dow and Degussa are working on HP based technologies in partnership with BASF and Udhe, respectively.

(i) By reacting propene with an aqueous solution of chlorine to form a mixture of 1-chloropropan-2-ol (90%) and 2-chloropropan-1-ol (10%). Epoxypropane (propylene oxide) forms on addition of a solution of either sodium hydroxide or calcium hydroxide. For example:


Indian Patents. 218789:INTEGRATED SYNTHESIS OF PROPYLENE OXIDE

In the mid-1990’s, Drs. Tom Tillotson, Alex Gash, Joe Satcher, John Poco, Larry Hrubesh, and Randall Simpson at Lawrence Livermore National Laboratory developed a new technique for synthesizing metal oxide gels: epoxide-assisted gelation of metal salts. This technique proved to not only enable preparation of metal oxide gels previously not possible, but also made synthesis of metal oxide gels much easier and resulted in stronger gels (and thus aerogels) with much better monolithicity. Gash further developed the technique in the early 2000’s by identifying the underlying mechanisms and extending it to many new elements. For this reasons the technique is commonly referred to as the “Gash Prep”.

1,2-Propylene oxide for synthesis | VWR

AB - Poly(propylene oxide) (PPO) is a low reactive telechelic polyether and the synthesis of high molecular weight poly(propylene oxide)-based block copolymers was studied. The poly(propylene oxide) used was end capped with 20 wt % ethylene oxide and had a molecular weight of 2300 g/mol (ultra-low monol PEO-b-PPO-b-PEO). The type of terephthalic acid based precursors was varied: terephthalic acid, dimethyl terephthalate, diphenyl terephthalate, di(trifluoro ethyl) terephthalate, di(p-nitrophenyl) terephthalate) and terephthalic acid chloride. High molecular weight poly(propylene oxide) based segmented block copolymers were obtained with diphenyl terephthalate (inherent viscosity: 1.6 dl/g).The synthesis of polyether(ester–amide)s comprising PPO and isophthalamide-based segments was also studied by varying the polymerization temperature and time. High molecular weight poly(propylene oxide) block copolymers could be obtained if the reaction was carried out for 2 h at 250 °C under vacuum. Higher temperatures (280 °C) and longer times result in lower inherent viscosities, probably due to degradation of the polyether.

Carcinogenic Effects of Exposure to Propylene Oxide - CDC

N2 - Poly(propylene oxide) (PPO) is a low reactive telechelic polyether and the synthesis of high molecular weight poly(propylene oxide)-based block copolymers was studied. The poly(propylene oxide) used was end capped with 20 wt % ethylene oxide and had a molecular weight of 2300 g/mol (ultra-low monol PEO-b-PPO-b-PEO). The type of terephthalic acid based precursors was varied: terephthalic acid, dimethyl terephthalate, diphenyl terephthalate, di(trifluoro ethyl) terephthalate, di(p-nitrophenyl) terephthalate) and terephthalic acid chloride. High molecular weight poly(propylene oxide) based segmented block copolymers were obtained with diphenyl terephthalate (inherent viscosity: 1.6 dl/g).The synthesis of polyether(ester–amide)s comprising PPO and isophthalamide-based segments was also studied by varying the polymerization temperature and time. High molecular weight poly(propylene oxide) block copolymers could be obtained if the reaction was carried out for 2 h at 250 °C under vacuum. Higher temperatures (280 °C) and longer times result in lower inherent viscosities, probably due to degradation of the polyether.

Acute Toxicity of Propylene Oxide for Various ..

Although Samuel Kistler is reported to have prepared aerogels of tin oxide in the 1930’s, the next metal oxide aerogels wouldn’t pop up until the 1980’s. These were the first alumina aerogels, first synthesized by Dr. Bulant Yoldas through the controlled hydrolysis of aluminum tri-sec-butoxide–a viscous, difficult-to-handle aluminum alkoxide with the consistency of honey. Suffice it to say this technique has its limitations and produced alumina aerogels of limited quality as a result. Aerogels of titania, zirconia, hafnia, vanadia, niobia, and tantala were eventually prepared using alkoxides as well, however unlike silica, good monolithicity and high optical transparency were hard to achieve in these aerogels.