发明名称 |
Method for recovering fluorine-containing emulsifier |
摘要 |
An aqueous solution containing a fluorine-containing emulsifier in a low concentration of at least 1 ppm by mass and at most 1% by mass (e.g., coagulation waste water after an emulsion polymerization of a fluoropolymer and/or an aqueous solution obtained by washing with an aqueous solution a waste gas from a drying process and/or a heat treating process of the fluoropolymer) is subjected to vacuum concentration under a pressure of at most 100 kPa and a temperature of the aqueous solution of at most 100° C. by means of a heating tube surface evaporation type concentrator equipped with a heat pump or the like, and the fluorine-containing emulsifier is recovered from a highly concentrated aqueous solution containing the fluorine-containing emulsifier in a higher concentration of at least 5% by mass. According to the present method, the fluorine-containing emulsifier can be recovered with a high yield from a low-concentration liquid such as coagulation waste water of a fluoropolymer.
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申请公布号 |
US7351342(B2) |
申请公布日期 |
2008.04.01 |
申请号 |
US20040012334 |
申请日期 |
2004.12.16 |
申请人 |
ASAHI GLASS COMPANY, LIMITED;SASAKURA ENGINEERING CO., LTD. |
发明人 |
FUNAKI HIROSHI;YANASE KOICHI;KAMIYA HIROKI;UEHARA MASAO;NAGATOMO KENICHIRO;NISHIMURA YASUSHI;OHNO SHIRO;HIRANO SATORU |
分类号 |
C02F1/58;B01D3/00;B01D3/06;C02F1/04;C02F1/06;C02F1/08;C02F1/26;C08F14/18 |
主分类号 |
C02F1/58 |
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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