查询词典 abietic acid

Separation of them and synthesis, biological activities of their derivatives are of great signfication in development of advanced-processed products of resin.In this paper, Abietic acid with 90.9% and 97.5% purity were obtained using A amine salt method and B amine salt method for the first time.

本文提出两种提纯高纯度枞酸的新方法，即A胺盐法和B胺盐法，A胺和B胺均为自制品，通过A胺盐法和B胺盐法可分别得到纯度为90.9%和97.5%的高纯度枞酸，成本仅为文献报道常用的二戊胺盐法成本的1/5和1/3。

The result showed that the oxidation reaction of abietic acid is first-order reaction during the initial period but then isn't first-order reaction because of oxidant film.

实验结果表明，枞酸氧化反应动力学在初期阶段呈表观一级，后期受氧化膜影响不呈表观一级。

About 90%of RFAs in DCS of deinked pulps were resin acids,among which DHA and abietic acid were the predominant ones.

脱墨浆DCS中树脂酸占脂肪酸和树脂酸总量的近90%，主要是脱氢枞酸和枞酸。

RFAs in the first refiner pulps were not dispersed into the water phase proportionally,and much smaller amount of abietic acid was released.

结果发现，木片挤压机的挤压作用对抽出物组分几乎没有选择性，基本按照原木片中抽出物的比例释放出来。

The aim of this thesis is to synthesize some new chiral quaternary ammonium salts and bis-quaternary ammonium salts from the popular material------Chloramphenicoland abietic acid, and then we used these chiral quaternary ammonium salts in some substitution reactions and addition reactions in order to research their catalytic action and asymmetric induction.

本文利用廉价易得的手性物质——氯霉素和去氢枞酸为初始原料，合成了几种新的季铵盐类手性相转移催化剂，扩大了手性相转移催化剂的来源，并把它们应用于取代反应和加成反应，以探讨其催化机理和不对称诱导效应。

Rosin acids ; isomerization ; abietic acid ; orthogonal experiment

松香树脂酸；异构；枞酸；正交实验

When the reaction temperatures were 303.15, 308.15, 313.15, 318.15, 323.15 and 328.15 K, respectively, the apparent reaction rate constants of abietic acid were 0.0036, 0.0041, 0.0062, 0.0087, 0.011 and 0.0157 min^(-1), respectively. Its reaction activation energy was 50.29 kJ/mol.

枞酸的氧化反应温度为30，35，40，45，50和55℃时，表观速率常数分别为0.0036，0.0041，0.0062，0.0087，0.011和0.0157min^(-1)，表观反应活化能E为50.29kJ/mol。

When the reaction temperatures were 303.15, 308.15, 313.15, 318.15, 323.15 and 328.15 K, respectively, the apparent reaction rate constants of abietic acid were 0.0036, 0.0041, 0.0062, 0.0087, 0.011 and 0.0157 min-1, respectively.

松香的氧化反应温度为35， 40和45 ℃时，表观速率常数分别为0.0009， 0.0015和0.0025 min-1 ，表观反应活化能 E a为80.2 kJ/mol。

Adding antioxidants MBP, FMH, DBH, DSB3 and DSB6 could reduce the oxidation rate of abietic acid when the reaction temperatures were 35, 40, 45, 50, 55℃The MBP, DBH, and DSB6 had remarkable antioxidative activities at 35℃, and their AO were 109.92, 50.93 and 209.84 respectively.

当反应温度为35，40，45，50，55℃时，5种抗氧剂都表现出不同程度的抗氧化能力，其中MBP，DBH，DSB6抗氧剂的抗氧化能力显著，在35℃下其抗氧化值AO分别是109.92，50.93，209.84。

The costs of abietic acid separating with A amine salt method and B amine salt method were 1/5 and 1/3 of cost separating with di-n-amylamine salt reported in the literature respectively.

同时研究了以酸异构化、高温异构化和微波辅助酸异构化松香制备枞酸含量较高的异构化松香的实验条件，以异构化松香为原料，采用多种方法分离提纯枞酸，得到最佳分离提纯条件。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。