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PURIFICATION PROCESS OF RAW ACRYLIC ACID BY CRYSTALLIZATION
PURIFICATION PROCESS OF RAW ACRYLIC ACID BY CRYSTALLIZATION
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机译:结晶法纯化丙烯酸的工艺
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PCT No. PCT/EP97/03304 Sec. 371 Date Dec. 30, 1998 Sec. 102(e) Date Dec. 30, 1998 PCT Filed Jun. 24, 1997 PCT Pub. No. WO98/01414 PCT Pub. Date Jan. 15, 19981,4-Dibenzothiazine-comprising crude acrylic acid is purified by crystallization by raising its diacrylic acid content to at least 1% by weight prior to the crystallization step.
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