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Distribution Behavior of Aminobenzoic Acid by Extraction with Di(2-ethylhexyl)phosphoric Acid 被引量:1
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作者 张瑾 戴猷元 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2000年第4期300-303,共4页
A series of extraction equilibrium experiments for aminobenzoic acid with di(2-ethylhexyl)phosphoric acid (D2EHPA) dissolved in n-octane or 1-octanol was carried out. The effects of aminobenzoic acid concentration,D2E... A series of extraction equilibrium experiments for aminobenzoic acid with di(2-ethylhexyl)phosphoric acid (D2EHPA) dissolved in n-octane or 1-octanol was carried out. The effects of aminobenzoic acid concentration,D2EHPA concentration and pH on the distribution ratio were discussed in detail. The infrared spectra of the organic phase loaded with solute illustrated that pH had little effect on the structure of the complex formed. There proceed ion association and cation-exchange.reaction in the extraction. An expression of the equilibrium distribution was proposed. 展开更多
关键词 EXTRACTION chemical complexation aminobenzoic acid D2EHPA pH value
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Sensitive determination of buformin using poly-aminobenzoic acid modified glassy carbon electrode
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作者 Gui-Ying Jin Hui Li Wan-Bang Xu 《Journal of Pharmaceutical Analysis》 SCIE CAS 2012年第6期458-461,共4页
Glassy carbon electrode, which is used to electrochemically determine the content of buformin, is modified with an electropolymerized film of p-aminobenzoic acid in pH 7.0 acetate buffer solution (ABS). The polymer ... Glassy carbon electrode, which is used to electrochemically determine the content of buformin, is modified with an electropolymerized film of p-aminobenzoic acid in pH 7.0 acetate buffer solution (ABS). The polymer showed an excellent electrocatalytic activity for the reduction of buformin. In pH 7.0 ABS, the cathodic peak current increased linearly over three concentration intervals of buformin, and the detection limit (S/N=3) was 2.0 ×10^9 g/mL. The method was successfully applied to directly determine buformin in tablets with standard addition recoveries of 95.8 102.5%. The proposed method is simple, cheap and highly efficient. 展开更多
关键词 Chemically modifiedelectrode aminobenzoic acid Buformin
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Reactions with Aminobenzoic Acids via Diazonium Salts Open New Routes to Bio-Derived Aromatics
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作者 Anthony Farlow Jens Olaf Krömer 《International Journal of Organic Chemistry》 CAS 2016年第2期95-99,共5页
Aromatics have a broad application in our everyday life ranging from plastics, coatings and fibres, to food and pharmaceuticals. To date the bulk of these aromatics is derived from naphtha-based pet-rochemistry. Howev... Aromatics have a broad application in our everyday life ranging from plastics, coatings and fibres, to food and pharmaceuticals. To date the bulk of these aromatics is derived from naphtha-based pet-rochemistry. However, recent progress in the fermentative production of metabolites using renew-able resources and engineered microbes has enabled the production of bio-precursors, such as 4-amino benzoic acid (pABA) and 2-amino benzoic acid (oABA). In this work we explored the feasibility of Sandmeyer reactions for the conversion of pABA to terephthalic and oABA salicylic acid, providing two very important platform chemicals for the chemical and pharmaceutical industries. We could demonstrate that both acids can be obtained from the amino benzoic acids derived from the shikimate pathway in microbes and plants. Good conversions could be achieved using Sandmeyer reactions at mild conditions with biodegradable reagents and without organic solvents. 展开更多
关键词 aminobenzoic acid Terephthalic acid Salycilic acid Sandmeyer Cyanations
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Extraction of Aminobenzoic Acid with TOA and TBP
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作者 张瑾 戴猷元 《Tsinghua Science and Technology》 SCIE EI CAS 2002年第1期52-55,共4页
A series of extraction equilibrium experiments for aminobenzoic acid were carried out. Tri n octylamine (TOA) and tributyl phosphate (TBP) were selected as complexing agents. 1 Octanol and kerosene were selected ... A series of extraction equilibrium experiments for aminobenzoic acid were carried out. Tri n octylamine (TOA) and tributyl phosphate (TBP) were selected as complexing agents. 1 Octanol and kerosene were selected as diluents. The effects of extractant concentration and pH on the distribution ratio were discussed in detail. It was found that there are ion pair association and hydrogen bond complexing in the extraction. Expressions of the equilibrium distribution for different solvent systems are proposed. The precision of the models is satisfactoy. 展开更多
关键词 extraction based on chemical complexation aminobenzoic acid tri n octylamine tributyl phosphate
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Adsorption thermodynamics and kinetic investigation of aromatic amphoteric compounds onto different polymeric adsorbents 被引量:4
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作者 WANG Hal-ling FEI Zheng-hao +2 位作者 CHEN Jin-long ZHANG Quan-xing XU Yan-hua 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第11期1298-1304,共7页
The adsorption behavior ofp-aminobenzoic acid and o-aminobenzoic acid onto the different polymeric adsorbents was systematically investigated as a function of the solution concentration and temperature. Experimental r... The adsorption behavior ofp-aminobenzoic acid and o-aminobenzoic acid onto the different polymeric adsorbents was systematically investigated as a function of the solution concentration and temperature. Experimental results indicated that the equilibrium adsorption data of the four polymeric adsorbents fitted well in the Freundlich isotherm. The adsorption capacity of multi-functional polymeric adsorbent NJ-99 was the highest, which might be attributed to the strong hydrogen-bonding interaction between the amino groups on the resin and the carboxyl group of aminobenzoic acid. The adsorption capacity of o-aminobenzoic acid onto any adsorbent was higher than p-aminobenzoic acid. Thermodynamic studies suggested the exothermic, spontaneous physical adsorption process. Adsorption kinetics results showed that the adsorption followed the pseudo-second-order kinetics model and the intraparticle mass transfer process was the rate-controlling step. 展开更多
关键词 aromatic amphoteric compound aminobenzoic acid polymeric adsorbents adsorption THERMODYNAMICS kinetics
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