乙酸

Using levulinic acid and phenol as raw materials, hydrochloric acid as catalyst and thioglycolic acid as assistant catalyst, the synthesis technology of diphenolic acid, a new polymer material substitution for biphenol A, was investigated.

研究了以苯酚和新型平台化合物乙酰丙酸为原料，采用盐酸为催化剂、巯基乙酸为助催化剂催化合成高分子材料单体双酚酸的合成工艺。

The factors which affect the average molecular weight of the polymer of AM and DMDAAC were investigated. The optimal reaction conditions are as follows: the concentration of monomer AM was 30%, while DMDAAC was 5%; the reaction temperature was 30℃, the amount of initiators at the low temperature stage was 0.05‰(compared to the weight of the monomers joining the polymerization), while V-50 was 0.025‰, the weight ratio of potassium persulphate to sodium bisulphite is 1:1, the amount of carbamide was 40‰, and complexing agent was 0.05‰, besides, aerate nitrogen gas for 8min, then the high molecular weight polymer (M=1.217×10^7) could be got after 16h reaction.

研究了影响AM与DMDAAC共聚物的平均分子量的因素，得到了优化条件为：单体浓度为30%，DMDAAC与AM摩尔比为5：95，聚合温度为30℃，低温段引发剂用量为0.05‰，K2S2O8与NaHSO3质量比为1：1，偶氮二异丁基脒盐酸盐(V-50)用量为0.025‰，尿素用量为40‰，乙二胺四乙酸二钠(EDTA-2Na)用量为0.05‰，在此优化条件下聚合反应16h后得到分子量为1.217×10^7的阳离子型聚丙烯酰胺。

Chemical constituents in ethyl acetate fraction of alcoholic extract from the flower of Bombax malabaricum DC .

采用GC-MS对木棉花醇提物乙酸乙酯溶解组分的化学成分进行了研究，共鉴定出46种成分。

OBJECTIVE To study inclusion of β-cyclodextrin with bornyl acetate .

目的 ：研究β环糊精对乙酸龙脑酯挥发油的包合作用。

Objective To study the technical preparation of Bornyl Acetate dropping pills.

目的对乙酸龙脑酯滴丸的制备工艺进行研究。

Preparation,homogeneity,stability and certification of reference substance of bornyl acetate were studied.

研究了乙酸龙脑酯标准样品的制备、均匀性和稳定性及其定值方法。

ObjectiveTo establish the method for determination of bornyl acetate in Valeriana amurensis volatile oil by Gas Chromatography.

目的建立黑水缬草挥发油中乙酸龙脑酯的含量测定方法。

ConclusionThe method can accurately determine the content of bornyl acetate in Valeriana amurensis volatile oil.

结论该法能准确测定黑水缬草挥发油中乙酸龙脑酯的含量。

Objective To establish a GC method to determine the content of bornyl acetate in fructus amomi, and to establish a quality control system for fructus amomi.

目的 采用毛细管气相色谱法测定砂仁中乙酸龙脑酯的含量，建立砂仁质量控制体系。

The results showed that after intragastric administration of DS-Borneol, the absorption and elimination of Borneol stepped down. Bornyl acetate was found as the metabolite of Borneol in rabbits plasma by GC-MS.

同时发现血浆中产生代谢新物质，经GC-MS法鉴定，确定该物质为冰片代谢物—乙酸冰片酯。

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。