发明名称 |
Process for producing methyl hydroxyalkyl cellulose ethers |
摘要 |
The present invention relates to a process for producing methyl hydroxyalkyl cellulose ethers by alkalisation and etherification of celluloses, rinsing the methyl hydroxyalkyl cellulose ethers with water at higher temperatures and recovering the short-chain cellulose ethers that are soluble in the wash water, wherein the wash water containing sodium chloride and organic by-products is passed across a first stage of a membrane filtration having a molecular cut size of 200 to 150,000 Dalton, is concentrated during this process and passes across a second stage of a membrane filtration.
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申请公布号 |
US5360902(A) |
申请公布日期 |
1994.11.01 |
申请号 |
US19920990867 |
申请日期 |
1992.12.15 |
申请人 |
WOLFF WALSRODE AG |
发明人 |
BRAUER, OKE;HAASE, BERND;HERZOG, DIETER;RIECHARDT, LUTZ;SONNENBERG, GERD;TEGTMEIER, DIETRICH |
分类号 |
C08B11/193;C08B11/20;C08B11/22;(IPC1-7):C02F1/44;C08B11/08 |
主分类号 |
C08B11/193 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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