查询词典 anhydride

In the presence of acetic acid and polyethylene glycol, chromic anhydride and acenaphthene react under mild condition and acenaphthene can completely convert into acenaphthenone .

在醋酸、聚乙二醇存在下，铬酸酐和苊在温和的条件下反应，苊可以完全转化为苊酮。

Acenaphthenone was prepared by the oxidation of acenaphthene in the presence of chromic anhydride , acetic acid and polyethylene glycol as a phase transfer catalyst under mild reaction conditions with high yields.

研究了在铬酸酐、冰醋酸和相转移催化剂聚乙二醇存在下苊的氧化反应，较温和的条件可高产率地得到苊酮。

Water-soluble air drying alkyd resin is formulated by flax oil acid,trimethylol propane,dimethyl isophthalate,benzoic acid,maleic anhydride and trimellitic anhydride.

以亚麻油酸、三羟甲基丙烷、间苯二甲酸、苯甲酸、顺丁烯二酸酐、偏苯三酸酐为原料合成水溶性醇酸树脂，中和后制得的涂料具有干性好、硬度高、耐水性和贮存稳定性优良等特性。

The optimum reaction condition for preparation of CoPcY is as follows: a , using CoCl2 as the exchanged salt ; b , complexation temperature of 180 ; c . complexation catalyst of NH4C1 and A1C13 .2, The unsymmetrically substituted cobalt phthalocyanine complexes were synthesized by statistical condensation of phthalic anhydride and tetrabromophthalic anhydride, and further immobilized in MCM-41 molecular sieves by zeolite synthesis method, as well as characterized by XRD,FT-IR,DRS, 1HNMRetc. The catalytic property of CoPcBrx/MCM-41was tested by cyclohexane oxidation using H2O2 or t-BOOH as oxidant.

2采用本路线制备CoPcY的最佳条件为：a、采用氯化钴作为待交换的金属盐；b、络合温度以180℃为宜；c、起始反应物为苯酐、尿素、氯化铵、氯化铝、CoY时，制备出的CoPcY的催化性能最好； 2、首次采用苯酐和四溴苯酐均相浓缩统计合成法制得了不对称取代的金属钴酞菁络合物，并采用~1HNMR、FTIR、DRS等对其进行了结构表征；此外，采用沸石合成法将其固定于MCM-41中孔分子筛，并对其催化性能进行了考察。

Oil and polyol firstly hydrolyze, and then react with maleic anhydride to give semi ester, the residual maleic anhydride hydrolyzing to give maleic acid, finally are adducted with DCPD. The result of experiment shows that the synthesized resin is of perfect air drying performance and improved flexibility and anti-greening because of the use of oil, meetin...

试验结果表明，油与多元醇在210～220℃下先醇解，然后与顺酐反应形成半酯，剩余顺酐水解成顺丁烯二酸，然后与DCPD加成，合成的树脂具有优良的空干性；同时油的使用极大地提高了涂膜的柔韧性和抗绿化性，得到的树脂性能上可满足涂料用不饱和聚酯树脂的要求。

Citric acid anhydride was synthesized by citric acid and acetic anhydride with acetic acid as solvent.

柠檬酸酐是由柠檬酸两个羧基间脱水形成的，具有吸水性和酰化能力，是合成农药、医药、食品、饮料、清洁剂、化妆品和树脂的一种重要的中间体[1-2]。

This paper take the typical craft of phthalic anhydride which productivity is 20000 ton/year as an example, and analyses the feasibility of using saturated steam turbine to generate electricity or to drive directly large-scale air blower, in order to recycle the afterheat generated in the process of phthalic anhydride production.

以生产能力为20kt/a的典型苯酐工艺为例，分析了用饱和蒸汽汽轮机回收苯酐生产中产生的余热用于发电或者直接驱动大型风机的可行性。

It is pointed out that developing of maleic anhydride using the butane source of Luoyang Petrochemical Branch Company can not only enhance the added value of liquified petroleum gas,but also change the present situation of no maleic anhydride installment in the Yellow River area,promote the fine chemical developme.

介绍了顺酐的主要生产方法和技术进展，分析了我国顺酐工业的生产现状、消费情况，提出用洛阳石化分公司现有的正丁烷资源开发顺酐产品，既能提高液化石油气的附加值，又可以改变中原地区没有大型顺酐装置的现状，促进中部精细化工的发展，具有显著的经济效益和社会效益。

The experimental results show that in the presence of acetic anhydride, the L-tyrosine can be completely racemized and converted into DL-tyrosine both in NaOH aqueous solution and in acetic acid solvent, and moreover, in the presence of acetic anhydride

今讨论了在碱性水溶液中，L-酪氨酸、乙酸酐和NaOH三者摩尔比例对消旋过程的影响和在纯乙酸溶剂中，乙酸用量和L-酪氨酸与乙酸酐的摩尔比例与消旋温度对消旋过程的影响。结果表明在乙酸酐的作用下，L-酪氨酸在纯乙酸溶剂中的消旋具有消旋速度快，DL-酪氨酸收率高的优点。

Reaction of citric acid with paraformaldehyde gave anhydromethylene citric acid with a yield of 63%;the reaction of compound with acetic anhydride gave the corresponding anhydride with a yield of 87%;the esterification of compound with lauryl alcohol gave anhydrocitric acid monoester with a yield of 76%.

将等浓度的柠檬酸和多聚甲醛加热，反应生成柠檬酸缩醛环酯，产率为63%；与乙酸酐反应得到相应的柠檬酸酐，产率为87%；与月桂醇酯化，生成产物，产率为76%；用二氧六环做溶剂，将与等浓度的碱进行开环反应，生成柠檬酸月桂醇单酯，产率为83%。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。