Sodium cyclohexanoloxyacetate was synthesized by 1mol︰1.15mol of cyclohexyl sodium alcoholate to sodium chloroacetate at 135145℃.The reaction time was 2.5h and the yield was about 81%.The sodium cyclohexanoloxyacetate was acidified by HCl to get the intermediate product,2-cyclohexanoloxyacetic acid.

以摩爾比為1︰1.15的環(huán)己醇鈉和氯乙酸鈉為原料，在135145℃下反應(yīng)合成了環(huán)己氧基乙酸鈉aa性欧美老妇人性交免费网站，反應(yīng)時(shí)間為2.5h无码一级午夜久久福利精品，收率約為81%，再將環(huán)己氧基乙酸鈉用鹽酸酸化制得中間體環(huán)己氧基乙酸99久久无码午夜体验区。

Chapter two 4-Hydroxybenzoic acid is connected with PEG6000 through defoliant DCC at rooom temperature, then the product is refluxed with chloroacetic acid in acetone to afford PEG-bound phenyloxyacetic acid, which is reacted with thionyl chloride, ammonium thiocyanate and arylamines in turn to give PEG-bound disubstituded thioureas. After the cleavage with sodium methoxide in methanol, the eleven disubstituted thioureas are obtained.

第二章 利用PEG6000作載體久久久精品一区二，通過脫水劑DCC在室溫下將對(duì)羥基苯甲酸以酯鍵連接在PEG6000上，再與氯乙酸在較溫和的條件下生成PEG6000支載的芳氧乙酸91精品在线啪，然后人人干干，依次與亞硫酰氯、硫氰酸銨欧美三级片黄片高潮、芳胺反應(yīng)亚洲免费黄片视频，生成PEG6000支載的硫脲，最后用甲醇鈉的甲醇溶液切割PEG国产手机在线观看一级一黄色视频，得到了十一種1116国产午夜精品美女毛片，3-二取代硫脲。

Esterification of terpineol with oxalic acid, chloroacetic acid and trichloroacetic acid by solid superacid MoO3/TiO2 was studied.

研究了MoO3/TiO2固體超強(qiáng)酸催化劑催化松節(jié)油與草酸欧美性交配视，氯乙酸青草青在线视频，三氯乙酸反應(yīng)的規(guī)律。

The optimum synthetic conditions of ethyl chloroacetate are: molar ratio of chloroacetic acid to ethanol is 1:8, the quantity of catalyst[Fe2(SO4)3 xH2O] is 10% of the mass of chloroacetic acid, reaction time is 1 hour, 5A zeolite was used as dehydrating agent. In these conditions, the yield of ethyl chloroacetate was up to 73%.

用Fe_2(SO_4)_3·xH_2O作為催化劑合成氯乙酸乙酯的較佳反應(yīng)條件是：酸醇物質(zhì)的量之比為1：8日韩超清极品无码不卡视频，催化劑用量為氯乙酸質(zhì)量的10％欧美日韩在线视频免费观看，以5A分子篩作為脫水劑，回流時(shí)間1h女人扒开腿让男人桶爽69视频，收率達(dá)73％以上日韩午夜福利免费一级网站免费。

Meanwhile, the optimum operation conditions obtained by orthogonal experiment are as follows: microwave power is 585 W, irradiation time is 30min, the amounts of catalyst is 1.5% of feed stock, mole ratio of alcohol to acid is 1.5:1, the yield of isoamyl chloroacetate is 93.2% Comparing with conventional heating method, the heating time under microwave irradiation is less than 1/14 of the former.

最佳工藝條件為：微波功率585W看黄网站免费中文字幕，加熱時(shí)間為25min，催化劑用量為2.0%国产www视频在线观看，醇酸比為1.5：1黄色网站在线观看网址，此條件下氯乙酸異戊酯的產(chǎn)率為93.2%。對(duì)比實(shí)驗(yàn)結(jié)果表明gogo人体艺术写真视频，微波輻射加熱法合成氯乙酸異戊酯的反應(yīng)速度至少是常規(guī)加熱法的14倍国内自拍骚视频。

Results: Recoveries over 90%,the relative standard deviation of sample (n=6) was 1.8% for dichloroacetic acid and 1.9% for trichloroacetic acid and the detection limit was 0.83 μg/L and 0.4 μg/L respectively.

結(jié)果：本法的加標(biāo)回收率在90%以上，6份平行樣品測(cè)定的相對(duì)標(biāo)準(zhǔn)偏差二氯乙酸為1.8%亚洲无码免费，三氯乙酸為1.9%欧美成人大片在线，檢出限依次為0.83μg/L和0.4μg/L。

The result of study on the apparent kinetics of photochlorination of acetic acid showed that the reaction rate is comparatively slow and the byproduct of dichloroacetic acid is created during the reaction. In order to put the technology of photochlorination of acetic acid into industrialization, the new technology about distillation column with a single reactor having a large reactive potency must be adapted.

由乙酸光氯化反應(yīng)宏觀動(dòng)力學(xué)研究結(jié)果可見色婷婷五月天激情四射，反應(yīng)速度相對(duì)較慢国产99视频精品免视看9，且生成二氯乙酸副產(chǎn)品，為了乙酸光氯化工藝實(shí)現(xiàn)工業(yè)化国产在线真人视频免费，必須采用具有較大反應(yīng)能力的反應(yīng)與精餾耦合工藝欧美日韩不卡。

The ionization enthalpies of acetic acid, chloro-, bromo- and iodo- acetic acids were measured at 5℃ intervals between 20℃ and 45℃ in aqueous solution by LKB-2277 Bioactivity Monitor.

本文用LKB-2277BioActivityMonitor以5℃的間隔測(cè)量了20-45℃溫度區(qū)間乙酸、氯乙酸亚洲AAA无码视频、溴乙酸和碘乙酸在水溶液中的電離焓黄片男女毛片男女。

The decisive influencing factor of viscosity in carboxyl-methylation was cross-linking reaction. Carboxyl-methylation was the main influencing factor of solubility and swelling capacity in modification of high content amylose starch. The structure and gelatinization property of different amylose content were analyzed with an Olympus Vanox BHS-2 multi-function optic microscope, and the results were as follows. The structure of ordinary cornstarch was different from the high amylose; gelatinization temperature and pH value of starch were affected deeply by amylose content, but had little difference between the gelatinization of high content amylose starch contained 50% and 70% amylose; pH value had much more effect than temperature on the gelatinization of high content amylose cross-linked starch. Monochloroacetic acid consumption, alcohol concentration and pH value influenced the starch carboxyl-methylation. When alcohol concentration was 60%, pH value 10, monochloroacetic acid/starch mass ratio 55%, the carboxyl-methylation of high amylose cross-linked cornstarch had the best result. With the In-Vitro digestibility model and biodegradation experiment, the digestibility and biodegradability of high amylose cornstarch and its modified starch were detected.

采用Brabande粘度測(cè)定儀和Olympus Vanox BHS-2型多功能光學(xué)顯微鏡等分析手段對(duì)鏈淀粉含量50％和70％的高鏈玉米淀粉及其交聯(lián)和交聯(lián)羧甲基化淀粉的結(jié)構(gòu)和性質(zhì)進(jìn)行了表征和分析，結(jié)果表明国产大学生A片三区在线，普通玉米淀粉結(jié)構(gòu)與含鏈淀粉50％和70％高鏈玉米淀粉結(jié)構(gòu)不同性屋视频在线；高鏈淀粉比普通淀粉難糊化，高鏈改性淀粉糊化受pH值影響較大色婷婷第一页，受溫度影響較泄谙逜级在线视频。坏矸鄣膬鋈诜€(wěn)定性一级啪啪啪免费视频、透光率黄色网站A片在线免费观看无码亚洲、溶解度、膨脹度和粘度受鏈淀粉的含量和改性的影響国产精品欧美在线极品，但是免费的色色的视频，鏈淀粉含量超過50％時(shí)，則鏈淀粉含量對(duì)淀粉的膨脹度和溶解度影響不大亚洲色婷婷综合开心网；改性淀粉性質(zhì)的影響因素中国产精品视频一区二区三区四区，影響粘度主要因素是交聯(lián)反應(yīng)，影響透明度两性激情综合网、溶解度和膨脹度主要因素是羧甲基化改性色色色五月网站；一氯乙酸用量、反應(yīng)時(shí)乙醇濃度及堿性條件都會(huì)影響高鏈淀粉及其交聯(lián)淀粉的羧甲基化改性效果亚洲三级电影网站，制備羧甲基化改性淀粉的最佳工藝是在pH值為10的60％的乙醇濃度介質(zhì)中按一氯乙酸/淀粉質(zhì)量比為55％進(jìn)行取代反應(yīng)在线国产视频一区二区三区。

There is no remarkable difference for removing proteins as consideration of de-protein rate at pH 2.5 of hydrochloric acid(69.55%) and trichloro acetic acid(73.73%).

三氯乙酸和鹽酸在pH 2.5時(shí)的脫蛋白率分別為73.73%和69.55%亚洲,无码,乱伦，差異不顯著，實(shí)際生產(chǎn)中可用鹽酸替代三氯乙酸進(jìn)行脫蛋白處理久久三级片精品区。