发明名称 |
Process for preparing 2,6-naphthalene-dicarboxylic acid |
摘要 |
The process of this invention for preparing 2,6-naphthalene-dicarboxylic acid comprises a reaction step (Step A) wherein 2,6-naphthalene-dicarboxylic acid potassium salts consisting of 2,6-naphthalene-dicarboxylic acid dipotassium salt and/or 2,6-naphthalene-dicarboxylic acid monopotassium salt are allowed to react with benzene-carboxylic acids in the presence of water to yield 2,6-naphthalene-dicarboxylic acid and benzene-carboxylic acid potassium salts and a separation step (Step B) wherein the crystallized 2,6-naphthalene-dicarboxylic acid is separated from the benzene-carboxylic acid potassium salts dissolved in the aqueous solution and provides 2,6-naphthalene-dicarboxylic acid, useful as raw material for polymers, at low cost on a commerical scale with recycle of potassium.
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申请公布号 |
US5175354(A) |
申请公布日期 |
1992.12.29 |
申请号 |
US19910678425 |
申请日期 |
1991.04.01 |
申请人 |
NIPPON STEEL CHEMICAL CO., LTD.;NIPPON STEEL CORPORATION |
发明人 |
MITAMURA, SHUICHI;TSUTSUMI, YASUHISA;KATA, YOSHIMI;KAWADA, ATSUSHI;OKABAYASHI, NAOYA |
分类号 |
C07C51/41 |
主分类号 |
C07C51/41 |
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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