1,4-二乙酰氧基丁烷

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Both 1,4-butanediol and tetrahydrofuran are useful as a solvent and raw materials for organic synthesis such as polymeric material. They have been produced through various ways. For example, tetrahydrofuran is produced by (a) catalytic hydrogenation of furan which has been obtained by elimination of carbonyl group from furfural, (b) dehydration cyclization of butanediol obtained by hydrogenation of butynediol which is a reaction product of acetylene and formaldehyde and (c) reaction of 1,4-diacetoxybutanediol and water in the presence of an acid catalyst; and 1,4-butanediol is produced by (d) hydrogenation of butynediol and (e) hydrolysis of 1,4-diacetoxybutane.

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Both 1,4-butanediol and tetrahydrofuran are useful as a solvent and raw materials for organic synthesis such as polymeric material. They have been produced through various ways. For example, tetrahydrofuran is produced by (a) catalytic hydrogenation of furan which has been obtained by elimination of carbonyl group from furfural, (b) dehydration cyclization of butanediol obtained by hydrogenation of butynediol which is a reaction product of acetylene and formaldehyde and (c) reaction of 1,4-diacetoxybutanediol and water in the presence of an acid catalyst; and 1,4-butanediol is produced by (d) hydrogenation of butynediol and (e) hydrolysis of 1,4-diacetoxybutane.

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The process for preparing tetrahydrofuran according to claim 1, wherein 1,4-butanediol is prepared by hydrogenating 1,4-diacetoxybutene, which is produced by the acetoxylation of butadiene, into 1,4-diacetoxybutane and hydrolyzing said 1,4-diacetoxybutane as the hydrogenated products in the presence of a solid acid catalyst and distilling hydrolyzates thus obtained.

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The tube reactor, charged with 110 grams of alumina catalyst (1/8 inch pellets, Harshaw Al-0104T), is maintained at 250° C while 25.0 grams of 1,4-butanediol diacetate and 50 ml. of water are admitted to the evaporator simultaneously from different addition funnels over a 20 minute period. The aqueous effluent collected contains tetrahydrofuran, acetic acid, and about 10% of the original diacetate. The mixture is again taken through the tube. The effluent from this second pass contains, as found by quantitative glpc analysis, 0.3 grams of residual butanediol diacetate (1% unconverted), 9.2 grams of tetrahydrofuran (90% yield), and 15.9 grams of acetic acid (93% yield). The tube reactor, charged with 110 grams of alumina catalyst (1/8 inch pellets, Harshaw Al-0104T) of water are admitted to the evaporator simultaneously from different addition funnels over a 20 minute period The aqueous effluent collected

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The tube reactor is charged with 85 grams of silica-magnesia catalyst (70% silica -- 30% magnesia, 3/16 inch × 3/16 inch pills, Davison Chemical) and maintained at 220°-250° C. As in Example 1, 50.0 grams of 1,4-butanediol diacetate and 50 ml. of water are copassed over one hour. The effluent contains, as shown by quantitative glpc analysis, 12.2 grams of the unconverted butanediol diacetate (24% recovery), 15.1 grams of tetrahydrofuran and 24.4 grams of acetic acid (96% and 93% yields, respectively, based on 76% conversion), and 0.1 grams of 4-acetoxybutanol (0.3% yield). The tube reactor is charged with 85 grams of silica-magnesia catalyst (70% silica -- 30% magnesia, 3/16 inch × 3/16 inch pills, Davison Chemical) maintained at 220°-250° C yields

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The tube reactor is charged with 85 grams of silica-magnesia catalyst (70% silica -- 30% magnesia, 3/16 inch × 3/16 inch pills, Davison Chemical) and maintained at 220°-250° C. As in Example 1, 50.0 grams of 1,4-butanediol diacetate and 50 ml. of water are copassed over one hour. The effluent contains, as shown by quantitative glpc analysis, 12.2 grams of the unconverted butanediol diacetate (24% recovery), 15.1 grams of tetrahydrofuran and 24.4 grams of acetic acid (96% and 93% yields, respectively, based on 76% conversion), and 0.1 grams of 4-acetoxybutanol (0.3% yield). The tube reactor is charged with 85 grams of silica-magnesia catalyst (70% silica -- 30% magnesia, 3/16 inch × 3/16 inch pills, Davison Chemical) maintained at 220°-250° C yields

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Both 1,4-butanediol and tetrahydrofuran are useful as a solvent and raw materials for organic synthesis such as polymeric material. They have been produced through various ways. For example, tetrahydrofuran is produced by (a) catalytic hydrogenation of furan which has been obtained by elimination of carbonyl group from furfural, (b) dehydration cyclization of butanediol obtained by hydrogenation of butynediol which is a reaction product of acetylene and formaldehyde and (c) reaction of 1,4-diacetoxybutanediol and water in the presence of an acid catalyst; and 1,4-butanediol is produced by (d) hydrogenation of butynediol and (e) hydrolysis of 1,4-diacetoxybutane.

反应条件: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A 100-mL flask is charged with 1000 mol. wt. PTMEG (5.0 g), acetic anhydride (32 g), and zinc chloride (1.0 g). The mixture is refluxed for 4 h at 140° C. Tetramethylene glycol diacetate is obtained in 31% yield. A 100-mL flask is charged with 1000 mol

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The tube reactor is charged with 88.1 grams of Linde 13X zeolite (150 pellets, pretreated at 200° C. with a tetrahydrofuran-acetic acid vapor mixture) and maintained at 190°-230° C. while 50.0 grams of 1,4-butanediol diacetate and 60 ml. of water are copassed, as in Examples 1-3, over a 1 hour period. The effluent is recycled three times until the diacetate is essentially converted. Quantitative glpc analysis of the final effluent shows the presence of 0.4 grams of butanediol diacetate (1% recovery), 9.5 grams of tetrahydrofuran (47% yield) and 30.4 grams of acetic acid (89% yield). A considerable amount of low boiling material is produced using this method.

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The tube reactor, charged with 110 grams of alumina catalyst (1/8 pellets, Harshaw A1-0104T), is maintained at 250° C while 25.0 grams of 1,4-butanediol diacetate and 50 ml. of water are admitted to the evaporator simultaneously from different addition funnels over a 20 minute period. The aqueous effluent collected contains tetrahydrofuran, acetic acid, and about 10% of the original diacetate. The mixture is again taken through the tube. The effluent from this second pass contains, as found by quantitative glpc analysis, 0.3 grams of residual butanediol diacetate (1% unconverted), 9.2 grams of tetrahydrofuran (90% yield), and 15.9 grams of acetic acid (93% yield). The tube reactor, charged with 110 grams of alumina catalyst (1/8 pellets, Harshaw A1-0104T) of water are admitted to the evaporator simultaneously from different addition funnels over a 20 minute period The aqueous effluent collected

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The tube reactor is charged with 85 grams of silica-magnesia catalyst (70% silica- 30% magnesia, 3/16 × 3/16 pills, Davison Chemical) and maintained at 220°-250° C. As in Example 1, 50.0 grams of 1,4-butanediol diacetate and 50 ml. of water are copassed over one hour. The effluent contains, as shown by quantitative glpc analysis, 12.2 grams of the unconverted butanediol diacetate (24% recovery), 15.1 grams of tetrahydrofuran and 24.4 grams of acetic acid (96% and 93% yields, respectively, based on 76% conversion), and 0.1 grams of 4-acetoxybutanol (0.3% yield). The tube reactor is charged with 85 grams of silica-magnesia catalyst (70% silica- 30% magnesia, 3/16 × 3/16 pills, Davison Chemical) maintained at 220°-250° C yields

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The process for preparing tetrahydrofuran according to claim 1, wherein 1,4-butanediol is prepared by hydrogenating 1,4-diacetoxybutene, which is produced by the acetoxylation of butadiene, into 1,4-diacetoxybutane and hydrolyzing said 1,4-diacetoxybutane as the hydrogenated products in the presence of a solid acid catalyst and distilling hydrolyzates thus obtained.