Shanghai, China
Shanghai, China

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Yashentech Corporation | Date: 2015-10-14

The present disclosure provides a diesel fuel composition containing DMC and multifunctional additives to reduce particulate emission, improve efficiency and be used in cold and/or hypoxia conditions.

Yashentech Corporation | Date: 2015-09-23

The present disclosure provides a process for producing dimethyl carbonate with high conversion rate. Alkylene glycol reacts with urea via alcohylysis reaction to produce alkylene carbonate and ammonia. The alkylene carbonate produced reacts with methanol via transesterification reaction to produce dimethyl carbonate. Before the dimethyl carbonate is separated from the mixture, the nitrogen-containing impurities are substantially removed. Unreacted feedstock and catalysts are recycled in the process.

Jiang Y.,Yashentech Corporation | Lu D.,Yashentech Corporation | Li Z.,Yashentech Corporation | Wang Y.,Yashentech Corporation | Gao Z.,Fudan University
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2011

Fischer-Tropsch(F-T) synthesis products were separated into tail gas, hot gas and wax three parts by a set of two traps maintained with different temperatures, and the GC analysis methods for these three parts were optimized. A PLOT Q column was used separately to analyze dry gas, a 13X packed column was used to separate He and H 2 and 100 m HP-1 was used to separate hot gas with carbon number up to C 30. The two dimensional chromatography of valve switch was used in order to save the analysis time. Dean-switch technique was used to analyze wax samples, by which the detailed product distribution below C 40 could be obtained. Relative standard deviation of each component was less than 3%. The products of F-T synthesis catalyzed by Co based catalyst were full analyzed with the GC system. It was found that the product distribution obeyed the classical ASF rule. With the GC system the measured mass balance, carbon balance, oxygen balance and hydrogen balance were 101.2%, 98.7%, 98.9% and 98.3%, respectively.

Liu D.,Yashentech Corporation | Han H.,Yashentech Corporation
Shiyou Huagong/Petrochemical Technology | Year: 2014

Reported vapor-liquid equilibrium data of dimethyl carbonate-methanol (DMC-MeOH) under normal pressure were correlated using the chemical process simulation software PRO/II. Based on the relationship between the lowest azeotropic point and boiling point of methanol, binary interaction parameters of the NRTL thermodynamic model were obtained by regression and the results were in agreement with experimental data. The correlated results showed that the average relative deviation of methanol vapor phase composition was 0.13%, and the average relative deviation of temperature was 0.04%. The importance of the vapor-liquid equilibrium data of ammonia-methanol (NH3-MeOH) in the separation process of DMC synthesized by the urea alcoholysis was proposed. Reported vapor-liquid equilibrium data of NH3-MeOH system were correlated and the obtained binary interaction parameters for the Wilson thermodynamic model could be applied in the wide ranges of temperature and pressure.

Chi L.,Yashentech Corporation | Li Z.,Yashentech Corporation | Jiang Y.,Yashentech Corporation | Lu D.,Yashentech Corporation
Petroleum Processing and Petrochemicals | Year: 2016

A high temperature gas chromatography coupled with cold-on-column inlet and flame ionization detector (FID) was used to rapidly determine the carbon number distribution of Fischer-Tropsch wax. The experimental parameters, such as column flow, oven temperature program, injection volume and sample concentration, were studied by DB-HT-SimDis column. Under the optimized GC conditions, the carbon number distribution of Fischer-Tropsch wax between C21 and C101 can be verified accurately within 60 min. The GC resolutions are higher than 1. 5 and 1. 2 for C21 to C74 and C74 to Cmi , respectively. The linear correlation coefficient value between ln(W/n) and carbon number in the range of C57 and Cmi is 0. 999 3 and the chain growth probability (a value) of 0. 928 is calculated.

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