发明名称 |
Selective catalytic dealkylation of 1,4-dialkylbenzene. |
摘要 |
<p>A mixture of dialkylbenzenes (from the alkylation of benzenes) contains 1,2-, 1,3-and 1,4- isomers; to selectively dealkylate the 1,4-isomer (e.g. p-cymene) the (usually gaseous) mixture is contacted with a bed of a catalyst which is a crystalline zeolite having (a) a silica: alumina mol ratio of at least 12 (e.g. up to 500) and a constrained index (indicating the channel size in the crystal) of 1 to 12, the zeolite being modified with a metal or metalloid (e,g, MgO) and treated with a Li compound, e.g. the acetate, to replace the positive ions with Li<+>. …<??>Reaction can be at 250 DEG to 600 DEG C for 0.1 to 60 seconds; an inert gaseous diluent can be present with the alkylbenzene. After reaction the catalyst is regenerated by heating. …<??>There can thus be provided a fairly pure 1-3- dialkylbenzene.</p> |
申请公布号 |
EP0127410(A2) |
申请公布日期 |
1984.12.05 |
申请号 |
EP19840303412 |
申请日期 |
1984.05.18 |
申请人 |
SUMITOMO CHEMICAL COMPANY, LIMITED |
发明人 |
SATO, HIROSHI;ISHII, NORIO;NAKAMURA, SHUZO |
分类号 |
B01J29/00;C07B61/00;C07C1/00;C07C4/18;C07C7/148;C07C11/02;C07C15/02;C07C67/00;(IPC1-7):07C4/18 |
主分类号 |
B01J29/00 |
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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