乙酸

Objective To determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of Edaravone, by gas chromatography.Methods Sample solution was injected on a GDX column (0.18 mm～0.25 mm) with nitrogen as the carrier gas.The residue was calculated by the external standard method.

摘要］ 目的：用气相色谱法测定依达拉奉合成起始原料乙酰乙酸乙酯中丙酮的残留量方法：采用固定相二乙烯苯乙基乙烯苯型高分子孔小球（直径为0.18 mm～0.25 mm），氮气为载气，用外标法测定乙酰乙酸乙酯中残留丙酮的含量。

The results also indicated a low production of acetic acid, acetoin and ethyl acetate, and high amounts of amyl alcohols in all of the ciders.

结果在全部萍果汁也表明了乙酸、乙醛和乙酸乙酯旳低产量和大量产生旳戊基乙醇。

0G/100g glycerol, which mostly affected the titration of commercial glycerol with 0.1mol/L NaOH, and it was the most important that shew the commercial glycerol acidific.

乙酸甘油酯的产生机制主要是发酵液中的代谢产物乙酸和丙三醇在蒸馏过程进行化学反应而生成的，并进行了验证。

It demonstrated that the hydroxy organic acids substituted with-OH,-SH at α—C such as lactic acid, Hydroxy-acetic acid, mercapto-acetic acid, glyconic acid have good selectivity for separation of hematite and aegirine pka values of organic acids fall down because of the-I inductive effect of-OH or-SH, and lie at the pH range between two minerals point-zero-charge. As a result, the depression ability of them was enhanced, and a cyclo-pentyl chelate was formed when this organic acids acted with Fe〓 on the minerals surface.

发现在α位具有-OH、-SH等取代基的短链一元羧酸（乳酸、羟基乙酸、巯基乙酸，葡萄糖酸）对赤铁矿与钠辉石的浮选分离具有优良的选择性抑制作用，-OH、-SH的-I诱导效应导致有机酸的pKa值下降并落在两种矿物零电点之间，使其抑制性能增强，并与矿物表面的Fe〓形成稳定的五元螯合环。

In this paper,four new methods of synthesis aminoacetic acid are introduced.

综述了催化合成氨基乙酸的工艺及反应条件，分析了各种反应的影响因素和特点，展望了氨基乙酸的生物合成技术前景。

Under ordinary pressure, take ammonia water and chloroethanoic acid as materials, and add catalyst which is made by our own,we can get aminoacetic acid .

以氨水、氯乙酸为原料，自制催化剂，常压下合成氨基乙酸。

The invention also relates to a preparation method of the selective infrared absorption material of the amino adipate with the intercalation structure, which is characterized in that hydrotalcite LDHs is taken as a precursor, and organic matter of aminoacetic acid is intercalated between the hydrotalcite LDHs layers by an ion-exchange method and then assembled to obtain the IDAs-LDHs with a good crystal phase structure and excellent performance.

本发明还涉及该氨基二乙酸插层结构选择性红外吸收材料的制备方法，以水滑石LDHs为前体，采用离子交换法将氨基乙酸类有机物插入到LDHs层间，组装得到晶相结构良好、性能优异的IDAs-LDHs。

D., 5m. The mobile phase consisted of a ternary gradient: methanol, 0.8% acetic acid and 0.01mol/L ammonic acid.

d。，5m上，以甲醇－0.8%乙酸－0.01mol/L乙酸铵溶液组成的三元流动相进行洗脱分离，紫外280nm检测。

By chromatographic techniques. On the basis of physico-chemical properties and spectral data, they were identified as α-amyrin,α-amyrin acetate, 27-hydroxy-α-amyrin,β-amyrin,β-amyrin acetate, ursolic acid,β-sitosterol, dauricine, emodin.

中分离得到9个化合物，通过理化性质和光谱分析，分别鉴定为：α-香树脂醇，α-香树脂醇乙酸酯，27-羟基－α-香树脂醇，β-香树脂醇，β-香树脂醇乙酸醇，熊果酸，β-谷甾醇，β-胡萝卜甙，大黄素。

Reaction (1) was examined with different kinds of acetal substrate(1) and vinyl ethyl ether, and the results indicated that the 1, 1,3-triethoxy compounds could be obtained in high yields of 88 and 97% respectively when the R groups of the acetal are phenyl and anisyl, while the yields amounted only to 55-75 % for R=a...

有证据表明这种催化反应也可能是通过正碳离子中间体进行的。本反应的产物1，1，3-三乙氧基化合物经乙酸/乙酸钠溶液水解可得反式α，β-不饱和醛。水解产率：芳香族产物大于90%，脂肪族产物大于75%。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。