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Evaluation of polyacrylamide gels with accelerator ammonium salts for water shutoff in ultralow temperature reservoirs:Gelation performance and application recommendations

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Petroleum 2016年第1期2卷 90-97页

作者： Hu Jia Qiang Ren Yong Ming Li Xian Ping Ma State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan 610500China Oil Production Technology Institute of Dagang Oilfield CNPCTianjin300280China

Water shutoff in ultralow temperature reservoirs has received great attention in recent *** previous study,we reported a phenol-formaldehyde-based gel formula with ammonium salt which can provide a gelation time between 2 hrs and 2 days at 25***,systematic evaluation and field recommendations of this gel formula when encountering complex reservoirs environment are not *** this paper,how and why such practical considerations as water composition,temperature,pH,weight ratio of formaldehyde to resorcinol and contaminant Fe3t to affect the gelation performance are *** DV-III and scanning electron microscopy(SEM)are employed respectively for viscosity measurement and microstructure *** results further illustrate the mechanism of the effect of salinity on gelation *** reveals that crosslinking done by covalent bond has great advantage for gel stability under high salinity *** target gel formula can provide desirable gelation time below 60C,perfect for 15e45C,while it is unfeasible to use high salinity to delay gelation at 60*** summarized the effect of salinity on gelation performance of different gel formulas from the present study and published *** summarized data can provide important guideline for gel formula design before conducting any kinds of *** variation of gelation performance at different salinity may be dominated by the interaction between crosslinker-salt-polymer,not only limited to“chargescreening effect”and“ion association”proposed by several *** hope the analysis encouraging further *** recommendations for field application of this gel are given in the end of this paper.

关键词： Polymer gel Ultralow temperatures Water shutoff ammonium salt Application recommendations

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Highly efficient synthesis of chiralβ-amino phosphine derivatives via direct asymmetric reductive amination with ammonium salts and H_(2)

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Green Synthesis and Catalysis 2022年第3期3卷 298-301页

作者： Yufeng Liu Linzhou Wang Yingjun Li Baode Ma Gen-Qiang Chen Xumu Zhang Medi-X Pingshan Guangdong Provincial Key Laboratory of Catalysisand Department of ChemistrySouthern University of Science and TechnologyShenzhen 518000China Shenzhen Bay Laboratory Shenzhen 518132China Academy for Advanced Interdisciplinary Studies and Southern University of Science and Technology Shenzhen 518000China

A highly efficient and enantioselective method for the asymmetric reductive amination ofβ-keto phosphine de-rivatives was disclosed,and the correspondingβ-amino phosphine oxides could be obtained in high yields(up to 97%yield)and excellent enantioselectivities(up to 97%ee).Moreover,the reaction worked well on a gram scale,indicating that our protocol has potential applications in the synthesis of chiral ligands and organocatalysts.

关键词： Asymmetric reductive amination Chiralβ-amino phosphine Ruthenium-catalysed ammonium salt

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Column leaching process of rare earth and aluminum from weathered crust elution-deposited rare earth ore with ammonium salts

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Transactions of Nonferrous Metals Society of China 2016年第11期26卷 3024-3033页

作者：何正艳张臻悦余军霞徐志高徐源来周芳池汝安中南大学资源加工与生物工程学院长沙410083 武汉工程大学绿色化工过程教育部重点实验室武汉430073

In order to better understand the leaching process of rare earth （RE） and aluminum （Al） from the weathered crust elutiondepositedRE ore, the mass transfer of RE and Al in column leaching was investigated using the chromatographic plate theory. Theresults show that a higher initial ammonium concentration in a certain range can enhance the mass transfer process. pH of leachingagent in the range of 2 to 8 almost has no effect on the mass transfer efficiency of RE, but plays a positive role in the mass transferefficiency of Al under strong acidic condition （pH〈4）. There is an optimum flow rate that makes the highest mass transfer *** optimum leaching condition of RE is the leaching agent pH of 4？8, ammonium concentration of 0.4 mol/L and flow rate of0.5 mL/min. The mass transfer efficiencies of RE and Al both follow the order：（NH4）2SO4〈NH4Cl〈NH4NO3, implying thecomplexing ability of anion.

关键词： column leaching process weathered crust elution-deposited rare earth ore rare earth aluminum ammonium salt masstransfer

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Copper Removal from Molten Steel by Gasification

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Journal of Iron and Steel Research International 1999年第2期6卷 10-13页

作者： Li Liansheng Li Shiqi Xiang Changxiang Cao Jie Liu Keming Li Suqin University of Science and Technology Beijing

A novel method is proposed to enhance the gasification and removal of copper from molten steel by adding ammonium salts or urea into molten steel under normal *** decopperization experiments were conducted in a molybdenum-wire resistance furnace at 1 873 *** copper content of about 400 g of a mild steel was reduced from 0.49%(mass fraction,the same below) and 0.51% to 0.31% and 0.38% using 0.7 g of NHC1 and 0.5 g of(NH)COrespectively,while the copper content of the molten steel was reduced from 0.61%to 0.56% using 2.00 g of NHCONH.

关键词： molten steel copper removal ammonium salt

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Analysis,Prediction and Process Optimization Concerning ammonium Chloride Corrosion in Ebullated-Bed Hydrogenation Unit for Treating Residual Oil

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China Petroleum Processing & Petrochemical Technology 2020年第4期22卷 108-116页

作者： Bao Zhenyu Wang Ning Zhang Hongfei Duan Yongfeng Yu Fengchang R&D Center of Luoyang Technology SINOPEC Engineering(Group)Co.LTD.Luoyang 471003

ammonium chloride corrosion in the reactor effluent system remains to be a barrier for the safe operation of the ebullated-bed hydrogenation unit as impurity content is higher compared with that of the ordinary hydrogenation *** this research,a Sinopec envisaged case study was conducted on feed oil containing 2.92μg/g of Cl and 0.38%of N,because the impurity content of feed oil was representative in residue *** deposition patterns in heat exchangers were investigated by changing process variables,and then water wash strategy was optimized in view of the relative humidity to obtain a minimum water flowrate,and finally the process optimization suggestions concerning the operation of heat exchangers were *** show that with the measured content of nitrogen and chlorine in the feed,the NH4Cl deposition temperature of hot high-pressure vapor and hot low-pressure vapor was 223.4℃ and 173.7℃,respectively,and the minimum water wash flowrate for heat exchangers of hot high-pressure vapor with mixed hydrogen and hot low-pressure vapor with cold low-pressure oil was 38.0 t/h and 5.4 t/h,*** wash should be carried out intermittently upstream of the heat exchanger tube *** consideration of energy consumption,it is recommended to reduce the tube pass outlet temperature of the above heat exchangers to 240℃ and 190℃,respectively.

关键词： ebullated-bed hydrogenation corrosion ammonium salt water wash deposition temperature

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