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关于在气相中酚的烷基化作用,主要記載于专利文献中。用的烷基化試剂是脂肪族的醇或烯;催化剂是在載体上的酸,盐或氧化物反应多半是在高压下进行。氧化物的催化剂如Al_2O_3,Tho_2+Al_2O_3与胶盐土曾被应用于在350—500°及常压下,用甲醇或乙醇进行酚的烷基化;所得一烷基酚的产率在52—70％之間。在160°及硅酸鋁存在下用丁烯进行酚的烷基化时,一異丁基酚的产率是10％,而二異丁基酚是48％、用丙烯使酚烷基化是在150—200°,高压和含有氧化鋁及氧化硅的催化剂存在下进行的;異丙基酚的产率約6％,此外还有相当量的異丙基酚的醚。本工作的目的系进一步发展教授及同志在用異丙醇进行苯及其衍生物烷基化领域的研究。并闡明羥荃对烷基化反应的影响。反应是在硅酸鋁催化剂上,于常压气相中进行。結果指出:在上述条件下得到了高产率(約95％)的異丙荃酚,主要含对位及邻位的異构体,在反应产物中間-異丙荃酚及異丙荃酚的醚均沒有发現。本反应最适宜条件认为是溫度210—230°及反应混合物輸送的空間速度0.2小时~(-1)。反应
The alkylation of phenols in the gas phase is mainly described in the patent literature. The alkylating agent used is an aliphatic alcohol or alkene; the reaction of the catalyst with an acid, salt or oxide on a support is mostly at elevated pressure. Oxide catalysts such as Al 2 O 3, Tho 2 + Al 2 O 3 and clays have been used to alkylate phenols with methanol or ethanol at 350-500 ° C and atmospheric pressure. The yield of monoalkylphenols obtained is between 52-70 %between. In the alkylation of phenol with butene at 160 and in the presence of aluminum silicate, the yield of monoisobutylphenol is 10% and that of diisobutylphenol is 48%. Alkylating phenol with propylene Carried out in the presence of 150-200 °, high pressure and a catalyst containing alumina and silica; the yield of isopropylphenol is about 6%, in addition to a considerable amount of ether of isopropylphenol. The purpose of this work is to further develop the professors and comrades in the field of alkylation of benzene and its derivatives with isopropanol. The effects of hydroxygen on the alkylation reaction were elucidated. The reaction is carried out on an aluminum silicate catalyst in a normal pressure gas phase. The results showed that under the above conditions, a high yield (about 95%) of the isoquinol, mainly containing para and ortho-isomers, the reaction product of -isochlorol and isoquinol ether Did not find. The most suitable conditions for this reaction are the temperature 210-230 ° and the space velocity of the reaction mixture delivered 0.2 hours -1. reaction