Detail of "637-92-3"

Reference

A mixture of ethers useful as a gasoline additive

A mixture of ethers useful as a gasoline additive. Spencer, Michael Staines (Imperial Chemical Industries PLC, UK). Brit. UK Pat.In this study， 628-04-6 and 108-20-3 are also used. Appl. GB 2123411 A1 1 Feb 1984, 9 pp. (English). (United Kingdom). CODEN: BAXXDU. CLASS: IC: C07C043-04; C10L001-18. APPLICATION: GB 83-16446 16 Jun 1983. PRIORITY: GB 82-19865 8 Jul 1982. DOCUMENT TYPE: Patent CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) A mixt. of ethers constituting an antikinock agent for gasolines is manufd. by synthesizing a mixt. contg. lower-mol.-wt. (e.g., MeOH and EtOH) and higher-mol.-wt. alcs., dehydrating the higher alcs. to olefins, and etherifying the olefins with the lower-mol.-wt. alcs. or with dialkyl ethers obtained by dehydration of the lower-mol.-wt. alcs. The typical mixt. comprises 40-80 wt.% tert-Bu Me ether [1634-04-4] and 31 of the following ethers: diisopropyl ether [108-20-3], tert-Bu Et ether [637-92-3], Et isoamyl ether [628-04-6], sec-amyl Et ether [919-94-8], and sec-Bu Et ether [2679-87-0]. .

Tertiary olefins

Tertiary olefins. (Sumitomo Chemical Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59055837 A2 31 Mar 1984 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C07C001-20; B01J021-12; C07C011-02. APPLICATION: JP 82-167055 24 Sep 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Tertiary olefins are prepd. from alkyl tert-alkyl ethers using Al2O3-SiO2 catalysts which are treated with hydroxides or weak acid salts of alkali metals or alk. earth metals. Thus, 10 g N-631L (SiO2-Al2O3) was added to 30 mL aq. soln. contg. 0.53 g Na2CO3, allowed to stand 30 min, evapd., calcined 1 h at 500° to give a catalyst, filled in a tubular reactor, and heated with an elec. oven. tert-Bu Et ether (I) [637-92-3] (52 mL/h, contg. 6% MeOH and 2% water) was gasified, passed through the reactor at oven temp. 236° and 7 kg/cm2 (gage) to prep. isobutylene [115-11-7] at I conversion 95%, Me2O selectivity 0.5%, and diisobutylene selectivity <0.3%, and the reaction was continued for 500 h without lowering the activity. A similar reaction using the untreated catalyst at 220° had conversion 90.5% initially, but the conversion was decreased to 85% after 125 h.