无水的

The following dehydration techniques of ethanol: distillation ,molecular sieve separation,membrane separation and corn adsorption are mainly concerned.

介绍了采用精馏法、分子筛分离法、膜分离法和作物吸附法制备无水乙醇的方法及其近年来无水乙醇制备的新进展。

Plate, printing ink and temperature control is waterless, directly influenced the development of ordinaary offsctdruckereien.

版材、油墨以及温度控制是无水胶印技术的关键，直接影响着无水胶印的发展速度。

The results showed: at the reaction temperature of 25～30 ℃,hydrogen pressure of 1.0～1.5 MPa,Vethanol∶Vcyclopentadiene of 5～6∶1,the catalyst dosage of 4 %～5 % and stirring rate of 800 r/min.The conversion of cyclopentadiene was above 98% and the selec...

结果表明，在反应温度25-30℃，氢气分压为1.0-1.5 MPa，无水乙醇作为溶剂，V无水乙醇∶V环戊二烯为5-6∶1，催化剂用量为4%-5%，搅拌速度为800 r/min条件下，反应时间2~3 h，环戊二烯的转化率大于98%，环戊烯的选择性大于95%。

The invention relates to a method for preparing dimeric acid methyl ester and dimer acid thereof.

本发明是一种制备二聚酸甲酯及其二聚酸的制备方法，以不饱和脂肪酸甲酯含量较高的混合脂肪酸甲酯或混合脂肪酸为原料，浓硫酸为助催化剂，无水氯化铝或无水氯化锌为催化剂，采用两步催化法进行二聚化反应。

Results showed that the optimum extraction conditions are that extract with ethanol for four hours, soak the remains with boiled water for 40min, repeat 3 times, sedimentate with 2 times volume ethanol; the content of tea polysaccharides is increasing with the fermentation time in different piles of Yunnan Pu-erh tea, 0.45% tea polysaccharides obtained in the first pile, and 1.68% in the forth pile.

试验证明：最佳提取工艺为无水乙醇浸提4h，取茶渣，沸水提取40min，重复3次，2倍体积无水乙醇沉淀；&涯堆&是普洱茶制作过程中的一道特殊工序，是形成普洱茶品质特征最关键的一步，翻堆样中茶叶渥堆时间越长，茶多糖含量越高，一翻堆含量仅0.45%，到四翻堆上升到1.68%，以上均为干物质计。

Back in Hong Kong, Chinese thenardite producer Lumena Resources (thenardite is a key ingredient in powder detergents, textiles, glass, chemical feedstock and pharmaceuticals) rang up 19% in gains on June 17. On June 22, the IPO of China Metal Recycling closed 22% higher. See pictures of China's infrastructure boom.

回到香港，中国的无水芒硝生产商旭光资源（无水芒硝是洗衣粉、纺织品、玻璃、化工原料和药品的一种关键配料）6月17日收益率达到19%。6月22日，中国金属再生资源有限公司IPO收盘时上涨了22%。

METHODS:Ceftizoxime acid was prepared with 7-Amino-3-norcephem-4-carboxylic acid(7-ANCA)and AE-ester ceftizoxime acid as raw material;then ceftizoxime sodium was obtained through the reaction between ceftizoxime acid and sodium carbonate.

以粗品7-氨基-3-烷基头孢烷酸和AE活性酯为原料合成头孢唑肟酸，再与无水碳酸钠反应制得头孢唑肟钠；同时研究反应时间、乙醇用量和滴加时间、无水碳酸钠的用量以及pH值对产品质量的影响。

Dam area of arable land accounts for about one third of the total cultivated area , slightly more than dry paddy field, and another part of the swidden land and no water to ensure that water into the paddy fields, water into dry land, when the "Ray ring fields."

坝区耕地占总耕地面积的三分之一左右，水田略多于旱地，另有一部分轮歇地和无水源保证，有水时成水田，无水时成旱地的&雷响田&。

Based on the reservoir engineering theory of horizontal well,the objective functions ofNPPandSNPVfor integrative evaluating water-free production of horizontal well were derived and established.

根据水平井油藏工程理论，推导并建立了综合评价水平井无水期合理产能的2个目标函数，提出了底水油藏水平井无水期合理产能的计算模型，并以塔中4油田水平井为例进行了分析验证，结果表明该方法简单实用。

Absolute ethanol and a mixed solution of ethanol and benzene with the volume ratio of 1:1 are used as the solvents, and carbon disulfide and sulfur powders as the sulfur ions source, respectively.

分别以无水乙醇及体积比为1：1的无水乙醇与苯的混合溶液为溶剂，以二硫化碳和单质硫为硫源。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。