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</p> <p> 在有机合成中,例如用无水醋酸钠和碱石灰共熔制备甲烷时,所用无水醋酸钠应在临用前制备。将适量三水醋酸钠放在瓷蒸发皿中,在玻棒搅拌下加热至çº?8℃时,三水醋酸钠溶解于结晶水中,水分逐渐蒸发后,得到白色固体,此时温度约ä¸?20℃。继续加热至固体熔融,但温度不要超过醋酸钠的熔点ï¼?24℃),以免醋酸钠分解为丙酮及碳酸钠。在搅拌下稍冷却,趁热在乳钵中研细,并立即储存于密闭容器中备用ã€? </p> <p> 2.用结晶碳酸钠中和醋酸,过滤后蒸发、冷却、结晶,在常温下干燥而成ã€? </p> <p> 3.用硫酸钠和碳酸氢钠处理醋酸钙而成ã€? </p> <p> 4.醋酸钠的生产方法很多,可以用稀醋酸或醋酸钙与纯碱作用而得;也可以用硫酸钠与醋酸钙复分解而得。工业上还常采用药厂和香料厂的下脚料回收醋酸钠。把628kg稀醋酸倒入反应器中,把200kg纯碱分次加入反应器中。不搅拌,开动引风机抽气。反应平稳后开动搅拌,使纯碱和醋酸充分反应,然后打入蒸发器加热浓缩至液体密度为1.24g/cm3时停止加热。反应液过滤后打入结晶器中,用NaOH调节Ph值为9.2,冷却至35℃结晶。抽去表面母液,甩干结晶得到350kg白色粉末状产品。一次产率约ä¸?0%ã€? </p> <p> 醋酸钠主要用é€?br /> 1.测定铅、锌、铝、铁、钴、锑、镍和锡。络合稳定剂。乙酰化作用的辅助剂。缓冲剂。干燥剂。媒染剂ã€?.用于测定铅、锌、铝、铁、钴、锑、镍、锡。用作有机合成的酯化剂以及摄影药品、医药、印染媒染剂、缓冲剂、化学试剂、肉类防腐、颜料、鞣革等许多方面ã€?.用作缓冲剂、调味剂、增香剂及ph值调节剂。作为调味剂的缓冲剂,可缓和不良气味并防止变色改善风味时使用0.1%ï½?.3%。具有一定的防霉作用,如使用0.1%ï½?.3%于鱼肉糜制品及面包。亦可用作调味酱、酸菜、蛋黄酱、鱼糕、香肠、面包、黏糕等的酸味剂。与甲基纤维素、磷酸盐等混合,用于提高香肠、面包、黏糕等的保存性ã€?.用作硫黄调节型氯丁橡胶炼焦的防焦剂,用量一般为0.5质量份。还可用作动物胶的交联剂ã€?.本品可用于碱性电镀锡的添加,但对镀层及电镀过程并无明显影响,不是必要成分。乙酸钠常用作缓冲剂,如用于酸性镀锌、碱性镀锡和化学镀镍ã€? </p><span id="nestremark"></span></p></div> <p> 上一条:<a href="/supply/12.html">结晶醋酸é’?/a> 下一æ?<a href="/supply/10.html">邻硝基乙苯厂å®?/a> </p> </div><div class="tag">相关标签ï¼?a href='/key.aspx?k=%e9%97%b4%e7%a1%9d%e5%9f%ba%e8%8b%af%e4%b9%99%e9%85%ae'>间硝基苯乙酮</a>,<a href='/key.aspx?k=%e9%86%8b%e9%85%b8%e9%92%a0%e4%bb%b7%e6%a0%bc'>醋酸钠价æ ?/a>,<a href='/key.aspx?k=%e9%86%8b%e9%85%b8%e9%92%a0%e6%89%b9%e5%8f%91'>醋酸钠批å?/a>,</div> <div class="clear"></div> <div class="clear"></div> <div class="title2"><h2>相关信息</h2></div> <div class="comment_list"> <ul> <li><a href="/news/311.html">【间硝基苯乙酮】的操作要求有哪些?存储时需要注意什么?</a></li> <li><a href="/news/308.html">间硝基苯乙酮废水处理技术分享!【安勤专栏ã€?/a></li> <li><a href="/news/305.html">间硝基苯乙酮的性质、用途与认知分别是什么?</a></li> <li><a href="/news/303.html">化学课堂:间硝基苯乙酮你知多少?</a></li> </ul> </div> <div class="title2"><h2>相关产品</h2></div> <div class="prob_list"> <div class="cn2"><h2><a href="/supply/12.html" target=""><img alt="结晶醋酸é’? 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