The invention relates to a process for producing polyethylene terephthalate 1, 3-propanediol, which comprises the following steps: using titanic acid ester as major catalyst, using germanium compounds and cobalt compounds as synergic catalyst, conducting esterification reaction for poly terephthalic acid and 1, 3-propanediol according to the molar 1:1.05-2.2 under the nitrogen pressure of 0.1-0.4MPa and 230-265 DEG C, or conducting ester exchanging reaction for poly terephthalic acid and 1, 3-propanediol according to the molar ratio 1:1.8-2.2 in 160-220 DEG C, decompressing reaction to high vacuum 10-150Pa, wherein the final temperature of reaction is 265-275 DEG C, recovering to normal pressure with nitrogen to obtain the PTT product.

本發(fā)明涉及一種生產(chǎn)聚對苯二甲酸1，3-丙二醇酯的方法久久精品视频官网，采用以鈦酸酯為主催化劑欧美精品一区二区黄色视频，鍺化合物和鈷化合物為協(xié)同催化劑，對苯二甲酸二甲酯和1黄色视频在线观看历史aaa，3-丙二醇按摩爾1∶1.05-2.2可以直接看的毛片网址，在0.1-0.4MPa氮氣壓力和230-265℃下進(jìn)行酯化反應(yīng)，或?qū)Ρ蕉姿岫柞ズ?欧美精品性欧美，3-丙二醇按摩爾比1∶1.8-2.2欧美性爱疯狂xxxxx18，在160-220℃進(jìn)行酯交換反應(yīng)，將反應(yīng)減壓至高真空10-150Pa国产黄一级视频网站，反應(yīng)終溫在265-275℃男人天堂网在线视频，用氮氣恢復(fù)到常壓，得到本PTT產(chǎn)品国产丰满的富婆aa毛片；大大縮短了反應(yīng)時間久久精品国产99国产，直接聚合制備特性粘度在0.7-1.05dL/g的PTT切片，使反應(yīng)產(chǎn)物色相良好美女不带套日出白浆免费视频，PTT產(chǎn)品可用于纖維加工及工程塑料領(lǐng)域三级爽片免费观看黄片。

The invention relates to a preparation process for synthesizing polyethylene terephthalate 1, 3- terephthalate catalyst, which comprises adding titanic acid ester, germanium compounds and cobalt compound into liquid dispersed phase of organic solution, wherein the total weight concentration is 4-10%, and preparing the catalyst through mechanical stirring or ultrasonic wave mixed ligand for 10-60 minutes in 0-120 DEG C, wherein the adding content of titanic acid ester, germanium compounds and cobalt compound are respectively 200-500ppm, 50-300ppm and 100-400ppm of reaction monomer mass of terephthalic acid or dimethyl terephthalate.

本發(fā)明涉及一種合成聚對苯二甲酸1，3-丙二醇酯催化劑的制備方法美国淫色网，將鈦酸酯男女日逼视频、鍺化合物和鈷化合物加入到有機溶劑的液體分散相中欧美老女人性爱网站，總重量濃度為4～10％，在0-120℃通過機械攪拌或超聲波混配10-60min制得91超碰一区二区三区；鈦酸酯啪在线看、鍺化合物和鈷化合物加入量分別是對苯二甲酸或?qū)Ρ蕉姿岫柞シ磻?yīng)單體質(zhì)量的200-500ppm、50-300ppm亚洲国产欧美在线人成大黄瓜、100-400ppm亚洲精品国精品久久99热一；用此催化劑制備PTT產(chǎn)品，酯化和縮聚反應(yīng)時間相對于單獨使用鈦酸四丁酯縮短了30-60min亚洲可以免费在线观看的黄色网址，產(chǎn)品特性粘數(shù)0.70-1.05dL/g迷奷漂亮的女教师AV在线播放，色相b值在2-6之間，切片可用于加工新型合成纖維及工程塑料產(chǎn)品查查黄色视频毛片。

We at last got six compounds of Schiff Bases of triazole derivaties and five compounds of 1,3,4-oxadiazole.

由于酰肼便宜易得AAAAA三级片在线播放，因此我們選取了兩種酰肼通過幾種不同的方法合成了五種唑類化合物并以其中三種化合物為基礎(chǔ)對其進(jìn)行修飾，得到了六種含三氮唑取代基的席夫堿和五種1黄色片子一级片，391精品啪在线国产，4-噁二唑類衍生物。

Two compounds were synthesized with two methods. The two compounds can be synthesized by two steps with triethylamine as catalyst.

分別用氫氧化鈉一级毛片一级毛片免费的啊、三乙胺為縛酸劑欧美日韩综合网，3-氨基-2-丁醇、2-氨基-3-戊醇午夜福利照片、環(huán)己酮和二氯乙酰氯為原料天天日夜夜操野外群奸的黄色片，采用一步法和分步法合成了兩種潛在除草劑安全劑。

Accord- ing to the observation that the compounds were stable in low pH aqueous solution and their sta- bility decreased when pH increased, and they rapidly decomposed to form α-methylenecyclopen- tanones derivative when pH reached 6 to 7, we postulated that the compounds were unabsorbable in stomack (where pH1-3) and unstable in small intestine (where pH5-8). The decomposed product was indeed inactive.

對Ⅰ類化合物在稀溶液中的穩(wěn)定性研究表明欧美性交ααα,AAA，低pH時化合物較穩(wěn)定人人爽人人看，隨著pH值的升高穩(wěn)定性逐漸降低，pH6~7時欧美淫荡性交免费，化合物迅速分解成α-亞甲基環(huán)戊酮類化合物中国熟妇色XXXXX不卡，由此而推測Ⅰ類化合物經(jīng)口給藥無效的原因為：它們在強酸性的胃中（pH1-3）呈離子狀態(tài)，因而不易吸收久久精品国产国产精福利，經(jīng)胃的排空運動進(jìn)入腸道后2级a片网站免费看，隨著pH逐漸升高（pH5-8）化合物迅速分解，而分解產(chǎn)物α-亞甲基環(huán)戊酮類化合物證明是無效的日韩性色自拍视频在线观看免费播放。

Its beneficial widespread effect on health is attributed to sulphur compounds and particularly to thiosulfinates. Odorless and stable, alliin is the most abundant sulfur compound in whole, unbruised Garlic. When the clove of garlic is cut or crushed, the enzyme alliinase is released from its compartment and transforms S-allyl-L-cysteine sulfoxide or alliin into diallyl thiosulfinate allicin, the characteristic compound of garlic flavor. This very unstable thiosulfinate is rapidly degraded to related organosulfur compounds. Allicin is often thought of as the "active ingredient" in Garlic, and has been the subject of numerous scientific studies, but its a fairly unstable compound that likes to react with itself.

蒜氨酸(S-烯丙基-L-半胱氨酸亞砜国产精品极品资源福利，alliin)是完整、未受損大蒜里面含量最豐富的硫化物爱看AV在线官网，并且非常穩(wěn)定殴美一级高清视频在线，它存在于大蒜的細(xì)胞質(zhì)里；當(dāng)細(xì)胞受損時，蒜氨酸酶從細(xì)胞液向細(xì)胞質(zhì)釋放一级黄色毛片网址，蒜氨酸和蒜氨酸酶接觸被迅速轉(zhuǎn)化為一系列新的化合物—蒜辣素及其相似物，蒜辣素(雙烯丙基硫代亞磺酸酯黄黄的在线网站，allicin)被認(rèn)為是大蒜中最重要的活性成分av资源观看，但它相當(dāng)不穩(wěn)定，易于自身反應(yīng)18岁免费看黄片。

As a rule, researchers discover that left-hand compounds are important medications, and left-hand compounds are useless, so much as unhealthful.

人們通常發(fā)現(xiàn)某些左手的化合物是有用的藥物又黄又粗又大又长又色又爽，而右手的異構(gòu)體卻沒有期望的藥效。

Thiocarbonyl compounds have similar chemical properties to those of carbonyl compounds because of their similar valence electron structures.

硫代羰基化合物與羰基化合物具有相似的價電子結(jié)構(gòu)情欲视频,欧美一级在线观看，因而具有類似的化學(xué)性質(zhì)中国熟妇性视频一区。

Analytical results showed that the upper clear liquid of pyrolysis oils was mainly consisted of water-soluble substances,such as phenol,cresol,xylenol,sugars,hydantoins,morpholines,pyranones and pyridine derivatives compounds,etc.,while the lower sediment was mainly insoluble or hardly water-soluble substances,such as the big substituent phenolics(the number of substituent carbon atoms of which is greater than or equal to 2),aryl phosphate esters,fatty acid esters and nitrile compounds,and so on.

研究表明，熱解油上層清液主要是一些較易溶于水的物質(zhì)日本ww视频，如苯酚www.色色色色色色色色色、甲酚、二甲酚免费黄色网址一区、糖類AV影院网站、乙內(nèi)酰脲類、嗎啉類H动漫全彩纯肉无码、吡喃酮類和吡啶類化合物等日韩不卡视频毛片；而下層沉淀則主要為不溶或難溶于水的物質(zhì)，如大取代基酚類（取代基碳原子數(shù)≥2）中文字摹人人精品、磷酸三芳基酯類欧美熟妇白嫩大屁黑人啪啪、脂肪酸酯類和腈類化合物等。

Seven compounds have been isolated from hard coral Acropora pulchra. These compounds are:pentadecoic acid, heptadecyl ester;(2)n-cetanol;(3)batyl alcohol;(4) N- [ 1 --2-hydroxyl--3,7-heptad-ecadienal] -hexadecanamide;(5)1 -0-hexanoyl-glycerol ester;(6)thymine;(7)uracil. Their structures were determined by IR, MS, HNMR, 13CNMR analysis.

從北海佳麗鹿角珊瑚Acropora pulchra乙醇提取液的乙酸乙酯部分分離出七個化合物综合国产视频，經(jīng)IR毛片加双、MS、~1HNMR全黄欧美、~(13)CNMR等波譜方法鑒定免费狼友，其結(jié)構(gòu)分別為：(1)十五酸十七酯，(2)正十六碳醇一级黄网，(3)鯊肝醇99riAV日日久，(4)N-1-羥基甲基-2-羥基—-3，7-十七碳二烯基十六酸酰胺在线美女永久免费网站，(5)1-正十六酸甘油酯人人摸人人操b，(6)胸腺嘧啶，(7)尿嘧啶日韩激情中文字幕在线看片。