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问题:醋酸甲酯的提纯
类型:求助 (悬赏分:3分)
提问:shuaianhua
等级:
版块:有机化学问题(jimuwei,fpcwin1211,netpanda,yjgzfl,Ftian,)
信誉:31%
回复:3
阅读:767
时间:2008-08-01 11:52:06  编辑    加入/取消收藏    订制/取消短消息    举报该贴    

各位朋友,我现在准备做醋酸甲酯,买的是维呢纶厂的粗品,主要成分水.醋酸甲酯,醛类,甲醇,我现有精馏塔是4米,填料是不锈钢波纹,塔节是4个,我的处理方案是这样,粗品先用盐分相,再用碳酸钾溶液干燥后精馏,也可以洗掉微量的酸,但其中的醛如用双氧水或高锰酸钾除掉的话风险太大,各位朋友有没有好的方法除去水分,醛。谢谢了!
回复人:czbzyh99,▲▲▲▲ (专业销售离子交换树脂催化剂、可提供乙酸乙酯成套技术。) 时间:2008-08-04 10:23:58   编辑 1楼
醋酸甲酯是没人要的,维尼纶厂是作为付产品产出的,不过是进行水解后,再循环回系统,你买的可能是他们排出的废液,更不好办了,成本会高些,但产品几乎没有市场,但愿你好运,能找到客户。


回复人:jeff,▲▲▲ (爱江山更爱化学) 时间:2008-08-01 13:32:06   编辑 2楼
Methyl acetate [79-20-91 M 74.1, b 56.7-57.2O, d 0.934. n 1.36193, n25 1.3538. Methanol in
methyl acetate can be detected by measuring solubility in water. At 20°, the solubility of methyl acetate in
water is ca 35g per 100m1, but 1% MeOH confers miscibility. Methanol can be removed by conversion to
methyl acetate, using refluxing for 6h with acetic anhydride (85ml/L), followed by fractional distn. Acidic
impurities can be removed by shaking with anhydrous K2CO3 and distilling. An alternative treatment is with
acetyl chloride, followed by washing with conc NaCl and drying with CaO or MgS04. (Solid CaC12 cannot be
used because it forms a crystalline addition compound.) Distn from copper stearate destroys peroxides. Free
alcohol or acid can be eliminated from methyl acetate by shaking with strong aq Na2C03 or K2CO3 (three
times), then with aq 50% CaC12 (three times), satd aq NaCl (twice), drying with K2CO3 and distn from P2O5.

http://www.ccebbs.com/bbs/dispq.php?lid=384624


回复人:wangcl1969,▲▲▲ (因为从事,所以爱好 ) 时间:2008-08-04 09:20:16   编辑 3楼
此产品好像销量不怎么样,我在2002年的时候,做过两年的市场调查,几乎无人问津。但愿你的运气好,




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