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(duì)羥基乙酸單體的純度要求較高色偷偷色噜噜狠狠网站老女肥，否則得到的聚合物分子量較低情侣av在线，導(dǎo)致高純度羥基乙酸的需求量逐年增長(zhǎng)，目前在國(guó)內(nèi)一级黄色毛片免费看,99久久综合，高純度的羥基乙酸還沒(méi)有形成工業(yè)化規(guī)模生產(chǎn)美女屄操出淫水视频在线观看，對(duì)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(guò)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)系国内偷拍91，從而改變了兩者之間的相對(duì)揮發(fā)度黄色a片免费在线播放，使得水和乙酸的分離變得相對(duì)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免费的三级黄网站，降低氯乙酸的物料消耗色视频在线视频一区二区，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(duì)北方某自來(lái)水廠常規(guī)水處理過(guò)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AV性爱网址，結(jié)果表明水體中只存在二氯乙酸和三氯乙酸欧美日韩免费特级黄片，其中三氯乙酸所占比例較大，為52%~90%久久久黄网大全免费无码；常規(guī)水處理工藝對(duì)二氯乙酸有較為明顯的去除效果一级片黄色网站一级片，去除率在15%以上，而對(duì)三氯乙酸沒(méi)有明顯的去除效果三级片小视频免费看，但總體而言其對(duì)鹵乙酸有10%左右的去除率国产网站黄色；預(yù)氯化對(duì)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(guò)程產(chǎn)生的鹵乙酸總量的60%以上99国产极品粉嫩在线观看，因此常規(guī)工藝有必要從預(yù)氯化工藝著手加以改進(jìn)四虎在线观看成人影院免费下载安装，來(lái)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(guò)程中產(chǎn)生等物質(zhì)量的氯化鈉十八岁禁看的黄色网站，采用莫爾法測(cè)定氯乙酸水解的產(chǎn)物氯化鈉国产欧美日韩永久，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A片不卡在线播放。

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狂野欧美性爱一区二区三区在线播放，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)久草视频15。最后youjizzcom中国妇女，分析了羥基乙酸的開(kāi)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)表明免费毛片不卡，一氯乙酸国产'a片视频、二氯乙酸的存在明顯地提高了制氫反應(yīng)效率AAA特级黄色视频，而三氯乙酸的存在卻不能起到促進(jìn)作用；反應(yīng)5h內(nèi)日韩欧美性爱综合视频，反應(yīng)生成氫的量與反應(yīng)時(shí)間成線性關(guān)系干死你肏死你视频；一氯乙酸、二氯乙酸光降解產(chǎn)物主要是CO_2成品app直播间、HCl和CH_2O欧美丝袜精品一区二区，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(duì)放氫反應(yīng)的影響91黄色在线观看免费观看；在實(shí)驗(yàn)濃度范圍內(nèi)AV免费九九在线观看，一氯乙酸、二氯乙酸濃度對(duì)放氫反應(yīng)的影響黄色视频射啦啦啦，表觀上符合Langmuir-Hinshelwood關(guān)系式欧美大屌强奸视频；考察了一氯乙酸、二氯乙酸在光催化劑表面的吸附欧美一级片欧美色性。

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固相萃取小柱分離狂操欧美美女高清动态视频、凈化和富集；采用乙酸乙酯／石油醚（體積比2：1）振蕩提取美女高潮喷水黄色视频，磺化法凈化国产精品久久九九，測(cè)定土壤中氯氟吡氧乙酸殘留量；以乙腈／水（體積比4：1）為提取劑午夜爽爽成人免费视频观看，氟羅里硅土固相萃取小柱分離不卡在线中文字幕、凈化，測(cè)定小麥樣品中氯氟吡氧乙酸的殘留量免费一级大黄片A片。

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 .

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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人人草人人艹，GAOs吸收乙酸的速率較快，且在乙酸濃度適宜的情況下三级国产网站，GAOs對(duì)乙酸的吸收不需要長(zhǎng)期馴化欧美专区福利，短期提高進(jìn)水中的丙酸量可抑制GAOs的生長(zhǎng)人人射色综合网。

ethyl acetate：乙酸乙酯

乙酸乙酯(ethyl acetate)又稱醋酸乙酯. 純凈的乙酸乙酯是無(wú)色透明有芳香氣味的液體,乙酸乙酯是一種用途廣泛的精細(xì)化工產(chǎn)品,乙酸乙酯具有優(yōu)異的溶解性日本乱人伦视频一区二区三区、乙酸乙酯快干性,乙酸乙酯用途廣泛,乙酸乙酯是一種非常重要的有機(jī)化工原料和極好的工業(yè)溶劑,

Acetic acid：醋酸,乙酸

fibre n.纖維, 構(gòu)造, 纖維制品, [植]須根 | 7、acetic acid 醋酸,乙酸 | acetic adj.[化]醋的, 乙酸的

acetic：醋的 乙酸的

711.volatile fatty acids 揮發(fā)性脂肪酸 | 714.acetic 醋的 乙酸的 | 715.propionic 丙酸的

phenyl ethyl acetate：乙酸苯乙酯

有大量的客戶需要,長(zhǎng)期求購(gòu)乙酸苯乙酯(Phenyl Ethyl Acetate)出口,有意者請(qǐng)來(lái)電,來(lái)函. 有大量的客戶需要,長(zhǎng)期求購(gòu)乙酸苯乙酯(Phenyl Ethyl Acetate)出口,有意者請(qǐng)來(lái)電,來(lái)函.

polyvinyl acetate：聚乙酸乙烯酯

聚乙酸乙烯酯(polyvinyl acetate)又名聚醋酸乙烯酯. 是乙酸乙烯酯(醋酸乙烯酯)的聚合物. 英文縮寫(xiě)為PVAc. 1912年德國(guó)F.克拉特和A.羅萊特首先發(fā)現(xiàn)聚乙酸乙烯酯. 1929年德國(guó)H.普勞松用乳液聚合法首先制得聚乙酸乙烯酯乳液.

ethyl acetoacetate：乙酰乙酸乙酯

縮合反應(yīng)機(jī)理酯分子中?-氫的酸性堿的強(qiáng)度交叉的 Claisen縮合 (Crossed Ester Condensation) 不含?-氫的酯乙酰乙酸乙酯 (Ethyl acetoacetate)烴基化及應(yīng)用乙酰乙酸乙酯 (Ethyl acetoacetate)烴基化及應(yīng)用

chloroacetic：氯乙酸的

chloro- 表示"綠 | chloroacetic 氯乙酸的 | chloroacetone 氯丙酮

chloroacetic acid：氯乙酸

[摘要]1.簡(jiǎn)述 氯乙酸(chloroacetic acid)是醋酸的氯取代產(chǎn)品,是一氯醋酸欧美老妇操逼大片、二氯醋酸精品免费观看69影院、三氯醋酸的總稱. 由于用途最廣泛的是一氯醋酸(MCAA,monochloroacetic acid),通常就把MCAA簡(jiǎn)稱為氯乙酸.

propionic：丙酸的

714.acetic 醋的 乙酸的 | 715.propionic 丙酸的 | 716.inhibitory 禁止的 抑制的

Method for determination of sodium propionate and calcium propionate in foods：食品中丙酸鈉、丙酸鈣的測(cè)定方法

魚(yú)罐頭衛(wèi)生標(biāo)準(zhǔn) Hygienic standard ... | 食品中丙酸鈉免费播看30分钟大片、丙酸鈣的測(cè)定方法 Method for determination of sodium propionate and calcium propionate in foods | 食品中脫氫乙酸的測(cè)定方法 Method for determination of...