发明名称 |
PREPARATION OF METHACRYLIC ACID |
摘要 |
Methacrylic acid can be prepared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250 to 400.degree.C with cooling of the hot reaction gas to below 100.degree.C, absorption of the methacrylic acid in a wateroperated absorption column, at below 100.degree.C and partial recycling into the oxidation reactor after admixture of methacrolein or isobutyraldehyde and oxygen by feeding a quantity of methacrolein or isobutyraldehyde equal to the quantity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorption column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas. a side stream which is washed in a wash column operated with water at < 10.degree.C to remove unconverted methacrolein or isobutyraldehyde which is fed as an aqueous solution to the top of the absorption column. |
申请公布号 |
CA1309418(C) |
申请公布日期 |
1992.10.27 |
申请号 |
CA19880570525 |
申请日期 |
1988.06.27 |
申请人 |
KRABETZ, RICHARD |
发明人 |
KRABETZ, RICHARD;DUEMBGEN, GERD;MERGER, FRANZ;JAEGER, MICHAEL;THIESSEN, FRITZ;VOGEL, HERBERT |
分类号 |
B01J27/19;C07B63/04;C07C51/00;C07C51/235;C07C51/25;C07C57/055;C07C57/07;C07C67/00 |
主分类号 |
B01J27/19 |
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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