in this research we used heavy propylene tetramer (hpt) and a1c13 —bf3 (lewis acids) ascatalyst and ethanol, n-propanol and n-butanol as co-catalyst. using lewis acids as catalyst, thehpts form molecules with higher molecular weight. since the raw materials of the reaction are byproducts of other reactions, are not pure and contain various compounds with different m.w andalso different chemical...

Grand canonical Monte Carlo (GCMC) simulations have been performed to investigate the localization and adsorption behavior of benzene and propylene, which are involved in the cumene synthesis process, in purely siliceous MWW zeolite (ITQ-1). From the mass clouds of GCMC simulations, it can be seen that the benzene and propylene molecules show different localization and adsorption behavior in th...

To the Editor: We wish to substantiate the important observations of LeGatt and Tisdell (1) cautioning against the use of propylene glycol as an internal standard for quantifying ethylene glycol. A 32-yearold woman presented to our emergency department in an agitated state after the ingestion of multiple drugs in an attempted suicide. Gastric lavage and charcoal were administered as well as int...

Propylene-grown Xanthobacter cells (strain Py2) degraded several chlorinated alkenes of environmental concern, including trichloroethylene, 1-chloroethylene (vinyl chloride), cis- and trans-1,2-dichloroethylene, 1,3-dichloropropylene, and 2,3-dichloropropylene. 1,1-Dichloroethylene was not degraded efficiently, while tetrachloroethylene was not degraded. The role of alkene monooxygenase in cata...

Propylene uptake by intact pea seedlings (Pisum sativum L. cv. Alaska) was easily detected using standard gas chromatographic techniques suggesting rapid metabolism. Comparative studies with highly purified 14C3Hs and 14C2H4 under aseptic conditions verified that propylene was rapidly metabolized and indicated that some aspects of its metabolism were similar to that of ethylene since 14C3H6, li...

The synthesis of two-dimensional double metal cyanide complexes of the formula Co(H2O)2[M(CN)4].4H2O (M=Ni, Pd or Pt) and the X-ray crystal structure of Co(H2O)2[Pd(CN)4].4H2O are presented. The anhydrous forms of these complexes were found to be effective catalyst precursors for the homopolymerization of propylene oxide as well as the random copolymerization of propylene oxide and carbon dioxi...

Propylene glycol is discharged to the surface and underground waters and vicinity soils via industrial wastewater effluents, posing many health and environmental risks. The main goal of this study was to remove propylene glycol from synthetic wastewater in a fixed bed activated sludge reactor. To observe the effects of organic loading on bioreactor performance, the organic loading was increased...

OBJECTIVES The primary objective was to evaluate the relationship between high-dose lorazepam and serum propylene glycol concentrations. Secondary objectives were a) to document the occurrence of propylene glycol accumulation associated with continuous high-dose lorazepam infusion; b) to assess the relationship between lorazepam dose, serum propylene glycol concentrations, and propylene glycol ...

Keratosis, one of the earliest skin manifestations of arsenicosis, can be treated by either oral or topical formulation of drug. In this study we examined the effectiveness and tolerance of propylene glycol for the treatment of arsenical palmer keratosis. Sixty patients of arsenicosis with palmer keratoses were randomly divided into three groups and different concentrations (15, 30 and 45%) of ...

AIM This study aimed to evaluate penetration of propylene glycol into root dentine. METHODOLOGY Safranin O in propylene glycol and in distilled water were introduced into root canals with and without artificial smear layer. Dye diffusion through dentinal tubules was determined spectrophotometrically. The time required for dye to exit through the apical foramen using propylene glycol and disti...