The preparation of polymer is required for high purity of glycolic acid, if not, low-weight polymer is obtained, therefore, high purity glycolic acid is scarce in the market. So, the research for the synthesis of glycolic acid is essential. In domestic and overseas, there are many methods for preparation of glycolic acid, including glycin oxidation, cyanogenesis, aldehyde oxidation, coupling of maldehyde and methyl formate, oxalic acid electrolysis, chloroactic acid hydrolysis and so on.

制備羥基乙酸的聚合物時(shí)，對羥基乙酸單體的純度要求較高，否則得到的聚合物分子量較低国产日韩亚洲欧美激情戏，導(dǎo)致高純度羥基乙酸的需求量逐年增長，目前在國內(nèi)99在线精品，高純度的羥基乙酸還沒有形成工業(yè)化規(guī)模生產(chǎn)黄色a片视频网导航，對羥基乙酸的合成進(jìn)行研究是非常有意義的。

N-methylacetamide was used as entrainer in separating acetic acid from water with extractive distillation ,and the interaction mechanism in this process was studied by using the density functional theory.

文獻(xiàn)[1-4]認(rèn)為萃取精餾分離乙酸水溶液過程中萃取劑與乙酸之間的氫鍵作用改變了溶液中乙酸和水的活度系數(shù)關(guān)系一区高清精品视频在线观看，從而改變了兩者之間的相對揮發(fā)度影音先锋视频资源，使得水和乙酸的分離變得相對容易。

Chloroacetic acid is a very important intermediate of Pharmaceuticals, dyes, pesticides, cellulose derivatives.

為了控制二氯乙酸的生成男人和女人做视频毛片，降低氯乙酸的物料消耗插插插视频，本論文采用連續(xù)法合成氯乙酸。

The investigation on the concentration of four haloacetic acid s during conventional water treatment process in waterworks and in drinking waters in North China showed that there were only dichloroacetic acids and trichloroacetic acids in waters,and the proportion of TCAA was from 52% to 90%.

對北方某自來水廠常規(guī)水處理過程及飲用水體中的4種鹵乙酸質(zhì)量濃度進(jìn)行了調(diào)查黄色α片，結(jié)果表明水體中只存在二氯乙酸和三氯乙酸在线视频A片，其中三氯乙酸所占比例較大，為52%~90%人人干全免费黄色视频；常規(guī)水處理工藝對二氯乙酸有較為明顯的去除效果色色色丝袜，去除率在15%以上，而對三氯乙酸沒有明顯的去除效果狼色精品中文字幕在线视频，但總體而言其對鹵乙酸有10%左右的去除率日韩午夜精品福利久久；預(yù)氯化對鹵乙酸的產(chǎn)生起主導(dǎo)性作用，該處產(chǎn)生的鹵乙酸占整個(gè)氯化過程產(chǎn)生的鹵乙酸總量的60%以上欧美精品一区二区福利视频一区，因此常規(guī)工藝有必要從預(yù)氯化工藝著手加以改進(jìn)性欧美69式XXXXX，來更好的控制鹵乙酸的產(chǎn)生量。

The amount of hydroxyacetic acid , equal to that of sodium chloride, produced from chloroacetice acid hydrolysis is determined by adopting Moore method and there fore the ratio of transformation of chloroacetice acid hydrolyzed can be calculated.

氯乙酸水解生產(chǎn)羥基乙酸的工藝過程中產(chǎn)生等物質(zhì)量的氯化鈉国产色在线观看手机在线观看，采用莫爾法測定氯乙酸水解的產(chǎn)物氯化鈉AV永久无码天堂网毛片，并計(jì)算氯乙酸的水解轉(zhuǎn)化率，從而選擇和控制水解反應(yīng)的條件3D动画漫无码网站自慰喷水。

The review highlights the technical developments in the identification,quantification and separation of α-hydroxyacetic acid,especially solvent extraction and synergistic extraction.

文章比較了各種羥基乙酸定性及定量分析方法最近高清不卡AV网站，綜述了羥基乙酸分離方法，特別是溶劑萃取和協(xié)同萃取效應(yīng)亚洲无码啪啪啪网站。最后精品美乳日韩视频，分析了羥基乙酸的開發(fā)前景。

The experimental results showed that, monochloroacetic acid and dichloroacetic acid enhanced photocatalytic hydrogen generation activity, but trichloroacetic acid did not improve it. The amount of produced H_2 increases almost proportionally to the irradiation time within 5 h irradiation. The photocatalytic oxidation of monochloroacetic acid and dichloroacetic acid mainly produced CO_2, HC1 and CH_2O, the photocatalytic oxidation of trichloroacetic acid mainly produced CO_2 and HCl.

實(shí)驗(yàn)表明黄色网站免费看入口，一氯乙酸91精品国语、二氯乙酸的存在明顯地提高了制氫反應(yīng)效率，而三氯乙酸的存在卻不能起到促進(jìn)作用国产婬乱a一级毛片多女；反應(yīng)5h內(nèi)国产女做a性色精品视频免费，反應(yīng)生成氫的量與反應(yīng)時(shí)間成線性關(guān)系；一氯乙酸、二氯乙酸光降解產(chǎn)物主要是CO_2www干干干操操操、HCl和CH_2O精品黄色网站一级，三氯乙酸光降解產(chǎn)物主要是CO_2和HCl；研究了溶液pH值對放氫反應(yīng)的影響人人摸人人操人人判人人干人人；在實(shí)驗(yàn)濃度范圍內(nèi)亚洲自拍在，一氯乙酸、二氯乙酸濃度對放氫反應(yīng)的影響天天日曰，表觀上符合Langmuir-Hinshelwood關(guān)系式韩国A级毛片免费久久；考察了一氯乙酸、二氯乙酸在光催化劑表面的吸附摸一摸AV。

Water samples were extracted and purified and collected by solid-phase extraction LC-18 column. Soil samples were extracted by ethyl acetate/petroleum ether (2:1, by vol) and purified by sulphonation. Wheat sample was extracted by acetonitrile/water (4:1, by vol) and purified and collected by SPE- Florisil column.

水樣直接用LC-18固相萃取小柱分離欧美乱操屄片、凈化和富集；采用乙酸乙酯／石油醚（體積比2：1）振蕩提取免费裸体黄网站，磺化法凈化国产福利一区二区精品免费，測定土壤中氯氟吡氧乙酸殘留量；以乙腈／水（體積比4：1）為提取劑亚洲怡红院久久精品综合，氟羅里硅土固相萃取小柱分離色哟哟色院91精品网站、凈化，測定小麥樣品中氯氟吡氧乙酸的殘留量欧美纯码黄视频。

Results showed that extraction abilities depends on the hydrophobic of solutes which pK〓 values are similar, e. g. acetic, propionic, butyric and valeric acids, while pK〓 values affect dominantly the extraction abilities of acids with similar hydrophobic, e. g. formic, acetic, chloroacetic, dichloroacetic, and trichloroacetic acids. Meanwhile, diluents and TOA concentration also affect the extraction equilibria of acids through the specific basicity of TOA .

TOA對酸性差別很小的一元羧酸如乙酸A爱片免费视频、丙酸、丁酸国产三级片在线看污、戊酸的萃取能力主要取決于羧酸的疏水性參數(shù)logP超碰97无码一区二区三区；TOA對疏水性參數(shù)差別較小的羧酸如甲酸、乙酸好看的av作品、一氯乙酸操操干干日日操、二氯乙酸、三氯乙酸的萃取能力主要取決于羧酸的電性參數(shù)狼友视频新网址；稀釋劑的種類色水在线、TOA的濃度都會影響TOA的表觀堿度pH〓，并通過TOA的表觀堿度影響羧酸的萃取平衡欧美视频一区二区三区。

The long-term and short-term effects of different propionic/acetic acid ratio and initial pH on the anaerobic and aerobic transformations of GAOs were studied.

2在丙酸和乙酸的碳摩爾濃度相同的情況下日皮免费网站，GAOs吸收乙酸的速率較快，且在乙酸濃度適宜的情況下www.麻豆精品，GAOs對乙酸的吸收不需要長期馴化黄色AV在，短期提高進(jìn)水中的丙酸量可抑制GAOs的生長。