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- diacetal of pentaerythritol 季戍四醇双缩醛
- The whole process can be divided into two steps:the synthesis of pentaerythritol diphosphite and distearyl pentaerythritol diphosphite. 本文以季戊四醇、亚磷酸三乙酯和十八醇为原料,在实验室合成了二硬酯基季戊四醇二亚磷酸酯。
- The effect of acid composition in feedstock on the low temperature performance of pentaerythritol ester base oil was studied. 研究了季戊四醇酯基础油的低温性能与原料脂肪酸碳原子组成之间的关系。
- A fast chromatographic determination of formaldehyde and acetaldehyde from the feed-in of pentaerythritol production was reported. 利用色谱法快速测定甲醛、乙醛混合溶液中各组分的浓度,为工艺提供准确的数据,指导工艺生产。
- The flame-retardant efficiency of pentaerythritol phosphate,aminated pentaerythritol phosphate and ammonium monoacid phosphate in the liner board was compared. 比较了3种含磷阻燃剂(磷酸季戊四醇缩合物、磷酸季戊四醇缩合物的铵盐、磷酸氢二铵)对箱纸板的阻燃作用。
- Di-acetals of pentaerythritol were synthesized by acetalization, carbonyl compounds, aldehydes or ketones and pentaerythritol under microwave irradiation without solvent. 微波辐射下,以氨基磺酸作催化剂,不用溶剂,合成了8种季戊四醇双缩醛(酮)。
- High performance rosin esters were produced by esterification reaction of pentaerythritol and toll oil rosin which was purified by reduced pressure distillation. 使用普通塔尔油松香和经过减压蒸馏纯化的精制塔尔油松香为原料,适当加入复合添加剂,通过酯化反应制得优质塔尔油松香改性树脂。
- Di-acetals of pentaerythritol were synthesized by acetalization, carbonyl compounds, aldehydes or ketones pentaerythritol under microwave irradiation without solvent. 微波辐射下,以氨基磺酸作催化剂,不用溶剂,合成了8种季戊四醇双缩醛(酮)。
- How can I persuade you of my sincerity? 我如何能够让你相信我的诚意?
- There is a vein of melancholy in his character. 他的性格中有少许忧郁的气质。
- A bowl of hot chicken soup is good for you. 喝一碗热鸡汤对你有好处。
- A cloud is a mass of vapor in the sky. 云是天空中的水汽团。
- This strain of wheat can grow during a cold spring. 这种小麦可以在寒冷的春天生长。
- Have a glass of beer to rinse your dinner down. 喝杯啤酒把你吃的晚饭冲下去。
- I bought a pair of tan leather shoes the other day. 前几天我买了双棕褐色的皮鞋。
- Gas chromatography was applied to the separation and determination of pentaerythritol(MPE) and dipentaerythritol(DPE) in the reaction mixture by a precolumn derivatization process. 应用柱前衍生-气相色谱法分离并测定了反应混合物中同存的季戊四醇(MPE)和双季戊四醇(DPE)、衍生化反应系在120℃加热的封闭试管中进行。
- Your work falls short of my expectations. 你的工作未达到我的期望。
- He bit off a large piece of the apple. 他咬下一大块苹果。
- Owing to the versatile application of pentaerythritol derivatives to organic synthesis, a lot of organic synthesis methods are able to be used in preparation of the new kind of glycoconjugate. 同时,由于季戊四醇衍生物在有机合成领域应用广泛,很多有机合成方法都可以应用到这类糖缀合物的合成中。
- He emphasized the importance of careful driving. 他强调小心驾驶的重要性。