Simple Method for the Conversion of Light Cracked Naphtha into Efficient Lubricity Improvers for Ultra-Low Sulfur Diesel.

Light cracked naphtha (LCN) is one of the olefin streams obtained from oil refinery in the petrochemical fluidized catalytic cracking unit. In this communication, we report a new method for the conversion of LCN into lubricity improvers for ultra-low sulfur diesel (ULSD) through a feasible two-step synthetic procedure. In the first step, olefins of LCN were subjected to the hydroboration reaction using BH3 to get the hydroxy LCN derivative which was then subjected to the esterification reaction with different organic acids to get the final LCN esters (6a-j). The lubricating property of the LCN esters was studied at two blending concentrations (300 and 150 ppm, wt/vol) with ULSD. Interestingly, ester (6a) derived from stearic acid showed the tiniest wear scar diameter in both dosage levels. The mechanism of lubricity action of LCN esters on metallic surfaces was studied by analyzing the worn surfaces using scanning electron microscopy and energy-dispersive X-ray spectroscopy techniques. The studies reveal that the lubricity additives derived from cracked naphtha through a simple chemical reaction strategy are promising precursors in enhancing the lubricity of ULSD.

Butterfly-Shaped Thiophene-Pyridine Hybrids: Green Electroluminescence and Large Third-Order Optical Nonlinearities.

A set of four symmetric, butterfly-shaped 4-(4-(decyloxy)phenyl)-2,6-di(thiophen-2-yl)pyridine (TPY) derivatives 2TPA-TPY (TPY center and triphenylamine end groups), 2CBZ-TPY (TPY center and N-ethyl carbazole end groups), 2TPY-TPA (triphenylamine center and TPY at the periphery) and 2TPY-CBZ (N-ethyl carbazole center and TPY at the periphery) was synthesized. The molecules show reverse saturable absorption (RSA) which is consistent with two-photon absorption (2PA) associated with excited-state absorption (ESA) when excited using a 532 nm laser beam. The molecules 2TPA-TPY and 2TPY-TPA possess extremely low limiting thresholds of 1.73 and 2.68 J cm-2 , respectively. An organic light-emitting diode (OLED) fabricated from 2TPA-TPY exhibits green emission with a maximum luminance of 207 cd m-2 , a current efficiency (ηCE ) of 1.51cd A-1 , a maximum power efficiency (ηPmax ) of 0.46 lm W-1 and an external quantum efficiency (ηEQE ) of 0.48 % at 100 cd m-2 .