重提纯

Meanwhile, among crystallization devices, column crystallizer is widely used because it realizes washing, recrystallization and sweating mechanisms at the same time in one single piece of equipment.

同时，在熔融结晶装置中，塔式结晶器由于能在同一设备中同时实现洗涤、重结晶和发汗提纯机理而被广泛使用。

The preparation procedure is as following: purification and assay for purity of neptunium, preparation of neptunium nitrate solution, making solution for ageing, subpacking the solution to ampoules, fire sealing, weighing for earch ampoule, homogeneity test, stability test, and certification.

以工厂的氧化镎作原料，经原料提纯→纯度鉴定→配成硝酸溶液→放置陈化→分装→火封→称重→均匀性检验→稳定性检验，最后进行定值。

In addition, the preparation and package and store for standard reference materials of antioxidant BHT are studied.

本论文主要叙述了对工业品防老剂BHT的重结晶提纯和区域熔融提纯(自行设计和制造了区域熔融仪，申请了发明专利)来制定防老剂BHT标准物质的研究：通过实验确定了乙醇重结晶提纯工艺；利用自行设计区域熔融装置，拟定操作规程和技术条件；确定提纯样品的高效液相色谱法和差示扫描量热法的纯度检测条件和实验方法；用高效液相色谱检验BHT标准物质的均匀性、稳定性；分别用高效液相色谱法和差示扫描量热法测定这种标准物质的不确定度评定及两种不同原理检测的定值分析；最后确定标准物质BHT的纯度和合成标准不确定度：标准物质的制备、包装及贮存。

In order to improve the purity of industrial product, Antioxidant BHT was purified by the methods of recrystalize and zone melting.

为提高防老剂BHT的纯度，采用重结晶和区域熔融法对工业品防老剂BHT进行提纯。

The hydration reaction catalyzed by the ion-exchange resin,was used to reduce the content of caryophyllene in the heavy turpentine and get the longifolene of high purity.

以离子交换树脂作催化剂，利用水合反应降低重质松节油中的石竹烯含量，再经过提纯获得高纯度的长叶烯。

The our company after relates in every way according to the above situation, already from overseas massively purchased the ZX-10 series desulphurization catalyst, has been able to coke with this catalyst technology the sulphonium compounds which the triphenyl contained, the nitrogen compound , the unsaturated compound and very many impurities, the fetid odor and so on removes, after the processing triphenyl always Sulfur content was lower than the petroleum benzene, the smell, the color, was consistent with the petroleum benzene.

目前焦化三苯在工业上使用范围小，销售价格也低于石油三苯。其主要原因是硫、噻吩等杂质含量高、气味重。而现在国际、国内焦化三苯、汽油、柴油等产品脱硫提纯去杂质的工艺均采用高压催化加氢法处理，该工艺设备投资巨大。根据以上情况我公司经多方联系，现已从国外大量购进ZX-10系列脱硫催化剂，用本催化剂技术已能将焦化三苯所含的硫化合物、氮化合物、不饱和化合物及很多杂质，臭味等脱除，处理后的三苯总硫含量低于石油苯，气味、颜色，均与石油苯一致。

In order to resolve the problem met in the pretreatment of traditional methods for Optical stimulated luminescence dating sample which can not obtain enough purity and quantity of quartz, a new quartz separation process in obtained, with contrast experiments, combined with the welldeveloped quartz purification techniques in glass production, finally a new quartz separation process is obtained.

为了解决光释光前处理中遇到的传统方法无法获得满足纯度石英的问题，通过大量对比实验，结合玻璃工艺中石英分离研究成果，最后获得了新的石英提纯流程，与传统方法相比，新方法通过化学分离避免了密度变化对石英长石分离的影响，从而解决了斜长石和岩屑在传统的重液分离中无法剔除的问题，新方法能够获得满足纯度要求和量要求的石英，同时，新方法比传统方法实验室工作效率更高。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷