Flumiclora - pentyl was prepared from p - fluorophenol as starting material via several steps such as chlorination , nitrification , reduction and condensation . the yield of the product was 50 % , and the purity was higher than 97 % 摘要以对氟苯酚为原料，首先与氯气发生反应，生成2 -氟4 -氯苯酚，再经过硝化、还原、缩合等几步反应得到氟胺草酯，反应总收率达到50 % ，产品纯度大于97 % 。
Supercritical co2 fluid extraction exhibits many advantages such as higher extraction yield and product purity , simple production process , lower energy consumption and without solvent residual , but its equipment requirement is high , and it is not easy to realize commercial process 超临界流体萃取法提取率高，产品纯度好，流程简单，能耗低，无有机溶剂残留，但对设备要求高，不易形成工业化生产。
N - phenyl - b - naphthylamine ( antioxidant d ) and 2 , 6 - di - tert - butyl - p - cresol ( anti - oxidant bht ) are the two kinds of antioxidant which are extensively used in our country . their standard reference materials can be used to rectify instruments and measure our analytical methods 防老剂d与bht标准物质可作为行业对其产品纯度检测的基准，用于校准测量仪器，评价测量方法的准确度，保证测量结果的准确性。
Abstract : this paper introduces a kind of special technology to treat low grade molybdate and sodium molybdate which makes frist ammonium leaching of molybdenum up to above 96 % , and frist bases leaching of molybdenum up to above 97 % , with the 0 . 5 % 1 . 0 % of total molybdenum amount washed away and the less than 4 % of molybdenum amount thrown away . consequently , the solution and product has gained arise of high purity 文摘:介绍了处理低品位钼精砂生产钼酸铵及钼酸钠的工艺，钼的一次氨浸率达96 %以上，一次碱浸率达97 %以上，随同废液流失的钼占总投入钼量的0 . 5 % 1 . 0 % ，弃渣含钼小于4 % ，所得溶液及产品纯度高。
The company is a joint - stock enterprise , it possesses 266 million login capital and 416 million permanent assets , undertakes exploitation , the company have 426 employees , the proportion of all kinds of professional technology personnel in all employees is 30 % , processed and sell of trona . and is in virtue of high purity , low salinity , excellent whiteness and less impurity , after the second item carry our point , the company will produce 700 thousand ton production every year 安棚公司是一家股份制企业，注册资金26600万元，固定资产41600万元，现有在册员工426人，各类专业技术人员占30 ，主要从事天然碱的开采、加工，二期达产后年产能力可达70万吨，产品纯度高、盐分低、白度好、杂质少。
