查询词典 propanediol

Propanediol (1,3-PD) is an important intermediate in the production of polyesters propylene terephthalate.

1，3-丙二醇是合成聚对苯二甲酸丙二醇酯的重要原料。

The project to be built with an annual output of 20,000 tons a polyethylene terephthalate plant. Adopting advanced and mature direct esterification process for the production of raw materials for purified terephthalic acid and 1,3-propanediol.

本项目拟建设一套年产2万吨聚对苯二甲酸丙二醇酯生产装置，采用国内先进成熟的直接酯化法生产工艺，主要原料为精对苯二甲酸和1，3-丙二醇。

The effect of reagents, reaction temperature, dinitrogen tetroxide and nitric acid on the yield and purity of 1,2-propanediol dinitrate were also investigated.

结果表明，N_2O_5和环氧丙烷硝化的主产物是1，2-丙二醇二硝酸酯，副产物是1，2-丙二醇单硝酸酯。

A study was made on the application of dimethyl silicone oil ,propanetriol and 1,2 propanediol to decrease the modulus of MVQ vulcanizate.

探讨了用增塑剂二甲基硅油、丙三醇和1，2－丙二醇降低甲基乙烯基硅橡胶硫化胶模量的途径。

In this paper, the acetalization of benzylaldehyde and 1,3-propanediol in the presence of vanadium phosphorus oxide catalyst was studied.

研究了苯甲醛与1，3-丙二醇在钒磷氧催化剂作用下的缩醛化反应，考察了反应时间、醇醛比、催化剂用量、带水剂种类和用量等因素对苯甲醛1，3-丙二醇缩醛收率的影响。

Acetalization of Benzaldehyde with 1,2 Propanediol over Dealuminated USY

脱铝超稳Y沸石催化苯甲醛与1，2-丙二醇的缩醛化反应

The strongly acidic cation exchange resin catalyzed synthesis of fructone-B by the reaction of ethyl acetoacetate and 1,2-propanediol was studied.

以硫酸高铈铵为催化剂，通过乙酰乙酸乙酯分别与乙二醇和1，2-丙二醇反应合成了苹果酯-A和苹果酯-B，研究了催化剂等有关因素对产品收率的影响。

Supported 12-Phosphotungstic Acid and Its Salts as Catalysts for the Synthesis of Fructone and Fructone-B;2. Their catalytic activities were measured by synthesis of fructone-B from ethyl acetoacetate and 1,2-propanediol.

制备了一系列以脱铝超稳Y沸石为载体的磷钨酸及其铯盐催化剂，考察了催化剂在以乙酰乙酸乙酯和1，2-丙二醇为原料催化合成草莓酯反应过程中的性能。

Various synthetic method of 1,3-propanediol were introduced and compared, including hydration and hydrogenation of acrylaldehyde, carbonylation of epoxy ethane , microbiological fementation, the process starting from methyl aldehyde, etc.

介绍了1，3-丙二醇的几种制备方法，即丙烯醛水合-氢化法、环氧乙烷羰基化法、微生物发酵法和以甲醛等为原料的方法。

Pyruvaldehyde was synthesized with acetone or 1,2 propanediol as starting material respectively.With n∶n=1 00∶0 79,3 0-4 0 g potassium chlorate as catalyst,and water and glacial acetic acid as solvent,refluxing on water bath of 60-75 ℃ for 4 h,bromoacetone was obtained in 63 5% yield.

分别用丙酮和 1，2 丙二醇做原料合成了丙酮醛。n∶n =1 0 0∶0 79，加入 3 0～4 0g氯酸钾做催化剂，水和冰醋酸做溶剂，水浴温度为 6 0～ 75℃，回流 4h ，制得产率为 6 3 5 %的溴丙酮。V∶V =11 9∶1 0 ，通入空气，在 6 5～ 70℃反应 5～ 8h ，制得产率为 5 9 6 %的丙酮醛。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。