Finally , the developing trend of etherification catalysts is emphasized .

最后指出了醚化催化剂的发展趋势。

Using refined cotton , chloroacetic acid , sodium hydroxide and hydrogen peroxide as main feedstock , sodium carboxymethyl cellulose was made by the process of basification , etherification , abstersion and drying .

以精制棉、氯乙酸、氢氧化钠和过氧化氢为原料，经过碱化、醚化、洗涤、干燥，制得羧甲基纤维素钠。

Methods atomoxetine hydrochloride was synthesized using3-phenyipropanol as the starting material via six steps , such as chlorination , bromination , etherification , substitution , separation of levorotary isomer and acidification by gaseous hydrogen chloride .

方法以1-苯丙醇为起始原料，经氯代、溴代、醚化、胺化、拆分、氯化氢成盐6步反应合成盐酸托莫西汀。

The synthetic technology conditions of urea-formaldehyde resin with low free formaldehyde were studied . The urea-formaldehyde resin was modified by using melamine , polyvinyl alcohol and etherification to reduce the content of free formaldehyde , maintaining its stability and stiffness effects .

研究了低游离甲醛含量脲醛树脂的合成工艺条件,采用添加三聚氰胺、聚乙烯醇和醚化的方法,对脲醛树脂进行改性,以降低游离甲醛的含量,保持其稳定性和硬挺效果。