Table of Content

22 July 2015, Volume 45 Issue 7 Previous Issue    Next Issue

JICHU YANJIU

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Influence of sodium dodecyl sulfate on viscosity characteristics of aqueous polyvinylpyrrolidone solution CHEN Jie, WU Ye-fan, ZHU Meng, FANG Yun 2015, 45 (7):  361-366.  doi: 10.13218/j.cnki.csdc.2015.07.001 Abstract ( 351 )   PDF (929KB) ( 395 )   Flow time data of aqueous polyvinylpyrrolidone-sodium dodecyl sulfate(PVP-SDS) complex solutions composed of different PVP mass concentrations (ρPVP) and SDS concentrations (cSDS) were examined with Ubbelohde viscometer.Observation results showed that there exists double critical concentrations of SDS,c1 and c2 on the flow time plots of PVP-SDS solutions,which means SDS bound-micelles were associated in cluster on PVP chains.It was also found that the reduced specific viscosity (ηsp/ρPVP) of PVP-SDS solutions increases with the decrease of ρPVP evidently in lower ρPVP scope,which was different from the behavior of simple aqueous PVP solution but similar to the typical polyelectrolyte sodium polyacrylate solution.The mean square end-to-end distance r2 and the relative expansion value k of PVP chains in the PVP-SDS cluster as compared with that of the simple PVP chains were calculated,and k values increases with the increase of specific clustered quantity [Г].Such an abnormal phenomenon in reduced specific viscosity curve was reasonably explained based on the calculation results and was attributed to the coil expansion of PVP chains caused by the charged SDS bound-micelles associated in cluster on PVP chains,which resulted in a unique effect on reduced specific viscosity similar to the “polyelectrolyte effect”. References | Related Articles | Metrics

KEJI JIANGZUO

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Performance and applications of surfactants (ⅩⅨ) Applications of surfactants in industrial and institutional cleaning HAO Shan-shan, ZHAO Li, XU Bao-cai 2015, 45 (7):  367-370.  doi: 10.13218/j.cnki.csdc.2015.07.002 Abstract ( 316 )   PDF (1951KB) ( 796 )   The detergency mechanism of surfactants was briefed,and then the applications of surfactants in industrial and institutional cleaning (I&I) were summarized.Finally,currently existing problems and their development outlooks were prospected. References | Related Articles | Metrics

KAIFA YU YINGYONG

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Influence of carbon chain length of counter-ion of didecyldimethylammonium carboxylate on its surface activity and application performance TANG Wei-yue, GENG Tao, DONG Zi-liang, JU Hong-bin, JIANG Ya-jie 2015, 45 (7):  371-374.  doi: 10.13218/j.cnki.csdc.2015.07.003 Abstract ( 240 )   PDF (781KB) ( 314 )   Influence of carbon chain length of counter-ion of didecyldimethylammonium carboxylate with separate carbon chain length (n=2,4,6,8,10,12) on its surface activity and application performance was explored via determination of surface activity as well as foaming performance,emulsifying performance and wetting performance of the quaternary ammonium salt.Results indicated that as the carbon chain length of the counter-ion increases gradually,the surface activity of the quaternary ammonium carboxylate increases gradually too;while its cmc declines gradually;its minimum surface tension (γcmc) declines firstly and rises afterward,achieving at a lowest value as the carbon chain length equivalents to n=10.Meanwhile,the efficacy for lowering the water surface tension of 20 mN/m (pc20) increases gradually;saturate adsorption (Гtotal) increases gradually;the area occupied by a single molecule of the surfactant (Am) decreases gradually.As the increase of the carbon chain length,both the foaming and emulsifying performance enhance firstly and decline afterward;while the wetting performance enhances. References | Related Articles | Metrics

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Effect of length scale on chromatographic separation of alkali-surfactant-polymer flooding YANG Chang-chun, YUE Xiang-an, ZHANG Li-juan, LIU Kai, ZHANG Yu 2015, 45 (7):  375-380.  doi: 10.13218/j.cnki.csdc.2015.07.004 Abstract ( 260 )   PDF (1762KB) ( 397 )   In view of chromatographic separation problem of chemical displacing agent and suitable scale models for evaluation of effect of alkali-surfactant-polymer (ASP) flooding,potentiometric titration method was used separately for quantitative determination of alkali and surfactant mass concentration of the effluen, while for quantitative determination of polymer mass concentration of the effluent,cadmium iodide and starch method was used.At the conditions of reservoir temperature of 69 ℃,chromatographic separation of the length scales sandpack of 30,100 and 240 cm on ASP flooding was separately investigated.The results showed that,with the scales of sandpack ranging from 30 to 240 cm,the normalized breakthrough time of polymer,alkali and surfactant is stepwise increasing correspondingly.With the scales of sandpack ranging from 30 to 100 cm,all the migration lag coefficients between the three components display rather big difference;the chromatographic separation is serious,but the degree of chromatographic separation does not increase.With the scales of sandpack ranging from 100 to 240 cm,there is a trend of decline of the degree of chromatographic separation.The model scale for the evaluation of effect of ASP flooding in the laboratory as well as in the oilfield site should be more than 100 cm. References | Related Articles | Metrics

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Study of catalytic oxidation of glycerol on cobalt-nickel phosphate molecular sieve under non-alkaline condition WANG Zeng-long, WANG Chao, LIU Lei 2015, 45 (7):  381-384.  doi: 10.13218/j.cnki.csdc.2015.07.005 Abstract ( 333 )   PDF (2619KB) ( 357 )   Cobalt-nickel phosphate molecular sieve (Co-VSB-1) was prepared adopting hydrothermal method.The calcined Co-VSB-1 was used as catalyst for the oxidation of glycerol with H2O2 as oxidant under non-alkaline condition.The effect of reaction conditions,such as the reaction time,temperature,H2O2/glycerol molar ratio,on the conversion and selectivity of glycerol oxidation were investigated in detail.The results showed that the Co-VSB-1 displays rather high selectivity with main oxidation products of glyceric acid and formic acid.Under the reaction conditions as:H2O2/glycerol molar ratio of 2,reaction time of 4 h and reaction temperature of 70 ℃,the conversion ratio of glycerol was 8.2% and the selectivity of glyceric acid,formic acid and glycolic acid was 45.1%,49.9% and 5.0%,respectively.Meanwhile,catalyst performance test result showed that the cobalt ions in the framework of Co-VSB-1 are responsible for the catalytic oxidation of glycerol. References | Related Articles | Metrics

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Effect of stabilizer on bleaching activation system of sodium per-carbonate in laundry detergent LI Lin, XU Yuan-mei, LU Li-xia, ZHAO Shun-xiang 2015, 45 (7):  385-388.  doi: 10.13218/j.cnki.csdc.2015.07.006 Abstract ( 334 )   PDF (818KB) ( 419 )   The effect of stabilizers on laundry powder detergent was studied by formulating stabilizers into laundry powder detergent with bleaching activation system of sodium per-carbonate.The results from per-acid release test showed that the addition of the stabilizer can ease the decomposition level of sodium per-carbonate.The detergency performance test results showed that the addition of the stabilizer can enhance the detergency on soiled cloth with colored stains,and the color protection test showed that the addition of the stabilizer can significantly reduce the damage on color of the fabric.In case the stabilizer was composed of blend of sodium ethylenendiamino-disuccinate and sodium ethylenediamine tetra(methylene phosphonate),the detergency and the color protecting effect of the laundry powder was substantially upgraded. References | Related Articles | Metrics

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Preparation of a strong potent sewer pipeline dredging agent CHEN Yan-ting 2015, 45 (7):  389-392.  doi: 10.13218/j.cnki.csdc.2015.07.007 Abstract ( 312 )   PDF (773KB) ( 287 )   Surfactant,strong alkali,strong oxidizing agent,flash melting and quick dredging component as well as heat-assisting agent were used to prepare a strong potent sewer pipeline dredging agent.The formulation factors affecting dredging were identified via experimental tests.The optimal formulation was studied by orthogonal test.Results showed that when the mass fraction of Ca(OH)2 is 65%,Ca(ClO)2 21% and surfactant 4%,the molar ratio of Ca(OH)2 to aluminum is 1∶2,and the mass ratio of C6H11NaO7 to aluminum is 1∶5,better efficacy of the dredging agent can be obtained,and the corrosion rates on most kinds of metal were rather low. References | Related Articles | Metrics

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Antioxidant activity as well as content of total flavonoids and phenolic acids in different parts of mung bean sprouts LI Li, ZHANG Xiao-hui, GONG Sheng-zhao, CHEN Qing-sheng, REN Han-kun, DONG Yin-mao 2015, 45 (7):  393-396.  doi: 10.13218/j.cnki.csdc.2015.07.008 Abstract ( 343 )   PDF (776KB) ( 327 )   When sprouting,a series of biochemical reactions will happen in the mung beans.The contents of total phenolic acids and total flavonoids in different parts of mung bean sprouts (root,embryo,skins and stems) were determined.Antioxidant activity of the methanol extracts was also evaluated by scavenging capability on DPPH free radicals using vitamin C as the reference.The results indicated that the contents of total flavonoids in root,embryo and skins of mung beans exhibit obvious difference.On the whole,the content of total flavonoids in the skins was significantly higher than that in the other parts.It is 6.6,3.3 and 2.9 times of that in root,embryo and stems respectively.Antioxidant activity of skins,embryo and stems was relatively high and close to the antioxidant activity of VC.The content of total flavonoids in the sprouts has a significant correlation with their antioxidant activity. References | Related Articles | Metrics

ZHUANLUN YU ZONGSHU

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Surface activity and aggregation behavior in aqueous solution of surface active ionic liquids LI Ping, DU Zhi-ping, WANG Guo-yong, YANG Xiao-yi, GUO Chao-hua 2015, 45 (7):  397-403.  doi: 10.13218/j.cnki.csdc.2015.07.009 Abstract ( 287 )   PDF (4666KB) ( 474 )   The surface active properties and aggregation behavior of surface active ionic liquids (SAILs) in aqueous solution were summarized.The effects of surface tension,as well as the aggregates formed in aqueous solution were reviewed emphatically.Finally,the existing problems and development prospects of the studies on the SAILs solution were discussed. References | Related Articles | Metrics

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Influence of dispersant structure on the performance of coal-water slurry ZHOU Chun-ming, CAO Qing, CHANG Hong-hong 2015, 45 (7):  404-408.  doi: 10.13218/j.cnki.csdc.2015.07.010 Abstract ( 339 )   PDF (1021KB) ( 521 )   Characteristics of coal-water slurry (CWS) and conventional dispersants for its preparation were introduced.Factors that affect the preparation of highly concentrated CWS and mechanism for action of the dispersant on the pulverized coal were described.Influence and principle of molecular structure of different dispersants on performance of the CWS were emphatically summarized.In addition,model for possible molecular structure of a perfect dispersant as well as the way for its synthesis was proposed References | Related Articles | Metrics

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Brief analysis of causes for sensitive skin and progress on evaluation methods for anti-allergic activity of cosmetics FAN Lin-na, JIA Yan, JIANG Li-gang, BI Yong-xian, DONG Yin-mao, HE Cong-fen 2015, 45 (7):  409-414.  doi: 10.13218/j.cnki.csdc.2015.07.011 Abstract ( 537 )   PDF (1485KB) ( 702 )   The causes of sensitive skin and its relationship with skin irritation and allergy were briefed.The status for research work with respect to development of cosmetic active ingredients for anti-allergic purpose was summarized.Progress on experimental evaluation methods of cosmetic's activity for shielding and protecting sensitive skin was highlighted. References | Related Articles | Metrics

FENXI YU JIANCE

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Comparison of analysis methods for determination of methanol content in dishwashing detergent adopting ISTD and ESTD ZHANG Peng, LU Wei, GUAN Lei 2015, 45 (7):  415-417.  doi: 10.13218/j.cnki.csdc.2015.07.012 Abstract ( 367 )   PDF (827KB) ( 482 )   The method for determination of methanol content in dishwashing detergent adopting ISTD as specified in GB 9985—2000 was improved.Difference between ISTD method and ESTD method for determination of methanol content in dishwashing detergent was compared.Via the spiking of isobutanol and dilution with 75% ethanol up to the specified volume,then filtered through 0.45 μm pinhole membrane,the prepared sample solution was separated by DB-FFAP chromatographic column and detected by FID detector,quantified separately with ISTD and ESTD.Results showed that the detection limit was 0.5 mg/L,the relative standard derivation of ISTD and ESTD were 0.4%~0.9% and 0.6%~1.2% respectively,and the average recovery were 100%~102% and 95%~99% respectively.Both the quantitative results with ISTD and ESTD can satisfy the requirement specified in the National Standard.However,the precision and recovery of ISTD method are better than that of ESTD method. References | Related Articles | Metrics