丙二醇

Catalytic activity of phosphotungstic acid on synthesizing butanone 1,2-propanediol ketal was discussed,the factors influencing the synthesis were discussed and the best conditions were found out.

探讨了磷钨酸对丁酮1，2 丙二醇缩酮合成反应的催化活性，研究了酮醇摩尔比、催化剂用量、反应时间等因素对产品收率的影响。

The effect of reaction time, the ratio of alcohol and ketone, catalyst amount, and the volume of water-carrying agent on the yield of cyclohexanone 1, 2-propylene ketal were investigated.

考察了反应时间、醇酮物质的量比、催化剂质量、带水剂体积等因素对环己酮1， 2-丙二醇缩酮收率的影响。

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。

Synthesis and liquid crystalline behavior of three recently reported mesogenic block-molecules, namely polyhydroxy 1-benzoylaminopropane-2,3-diols I、star-shaped pentaerythritol tetrabenzoates II and calamitic bolaamphiphiles with lateral chains III which are constituted of anisometric block, amphiphilic block and alkyl or perfluorinated chains with different topologies are reviewed in this article.

本文对近来报道的三类嵌段液晶分子：多羟基1－苯甲酰胺－2，3－丙二醇两亲性分子I，星状季戊四醇苯甲酸酯II及带侧链的波拉化合物III的合成及自组装行为作了综述。

Moisturizer:Water,propylene glycol,saccharide isomerate,chondrus crispus,peg-40 hydrogenated castor oil,imidazolidinyl urea,methylparaben,sodium hyaluronate,pentadecalactone,citrus aurantium dulcisoil,lactic acid,iris germanica root extract,sodium hydroxide,citrus aurantium amara oil,yellow 6(CI 15985),limonene,linalool

保湿精华：水，丙二醇，天然异构寡糖，卡拉胶，PEG-40氢化蓖麻油，尿素醛，羟苯甲酯，透明质酸钠，环十五内酯，甜橙油，乳酸，鸢尾花根萃取，氢氧化钠，苦橙油，黄 6(CI 15985)，柠檬精油，芳樟醇

At first, urea decomposed into isocyanic acid, which interacted with ZnO to form a relatively steady isocyanate species. Then propylene glycol reacted with isocyanate species to form hydroxypropyl carbamate, and the HPC lost ammonia to form PC.

结果表明，该反应是分步进行的，首先尿素分解生成氨气和异氰酸，异氰酸与ZnO作用形成异氰酸物种，在丙二醇的作用下生成中间产物羟丙基氨基甲酸酯，然后由HPC脱氨气生成PC。

Propylene glycol monomethyl ether propionate is new member cf P series solvent of glycol ethers, it not only has the excellent solubility, but also has the lowest genital toxicity among the all of glycol ethers, as a result it is called "green solvent".

丙二醇单甲醚丙酸酯是P系列二元醇醚溶剂中的新成员，它不仅具有优异的溶解性能，更是二元醇醚溶剂中生殖毒性最低微的产品，因而被称为&绿色溶剂&。

Ingredients: lavender extract, whitening factor, moisturizing factor,palmitic acid, lauric acid, tetradecanoic acid, fatty acid methyl taurate.

成分：薰衣草精华，美白因子，羟乙基纤维素，丙二醇，甘油，甲基丙烯酰乙基甜菜碱，甲基丙烯酸酯共聚物。

The preparation process of SO4 2-/TiO2 type of solid superacid catalyst used for the synthesis of propylene glycol methyl ether propionate was investigated.

研究了合成丙二醇甲醚丙酸酯用固体超强酸催化剂SO4 2-／TiO2的制备工艺，得到了催化剂制备的适宜工艺。

Of SXMC's current main products include more than 20 bulk pharmaceutical chemicals such as meprobamate, ketamin Hcl, carisoprodol etc., and chemical intermediates such as 2-methy-2-prolpyl 1,3-propanediol.

山西医药集团太原制药厂主要产品有：甲丙氨酯、盐酸氯胺酮、卡立普多等20余种原料药及精制丙二醇等化工中间体。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。