发明名称 |
METHOD FOR PREPARING 2-NAPHTHOLSULFOACIDS |
摘要 |
FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to the improved method for preparing 2-naphtholsulfoacids. 2-Naphtholsulfoacids are synthesized by sulfonation of 2-naphthol followed by precipitation of the end sulfoacid as its difficultly soluble salt and filtration of precipitate. Filtrate is acidified with sulfuric, hydrochloric or acetic acid to concentration 15-30 wt.-% as measured for sulfuric acid and 2-naphtholsulfoacids containing in filtrate are subjected for thermal hydrolysis at temperature 130-180 C under pressure 0.2-0.8 MPa for 2.5-5 h. 2-Naphthol prepared after cooling reaction mass is separated by filtration or separation and recovered to the sulfonation stage. Invention allows reducing consumption norms by 2-naphthol that provides significant economic effect. EFFECT: improved preparing method. 1 cl, 2 tbl, 6 ex
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申请公布号 |
RU2212402(C1) |
申请公布日期 |
2003.09.20 |
申请号 |
RU20020115835 |
申请日期 |
2002.06.13 |
申请人 |
OTKRYTOE AKTSIONERNOE OBSHCHESTVO "PIGMENT" |
发明人 |
LEONT'EVA A.I.;UTROBIN A.N.;FEFELOV P.A.;CHUPRUNOV S.JU.;CHEMERCHEV L.N. |
分类号 |
C07C309/43;C07C303/06;(IPC1-7):C07C309/43 |
主分类号 |
C07C309/43 |
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