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Method for synthesizing prenol by composite catalyst
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A technology of composite catalyst and isopentenol, which is applied in the direction of isomerization preparation, etc., can solve the problems of reducing product competitiveness, increasing product cost, and less application times, and achieves more application times, energy saving and low cost. Effect
Active Publication Date: 2014-04-16
SHANDONG NHU PHARMA +1
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Problems solved by technology
These methods all use rare metals, the price is high, and the number of applications is small; the cost of the product is increased during industrial production, and the competitiveness of the product is reduced.
Method used
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Embodiment 1
[0016] Add 200 grams of 3-methyl-3-buten-1 alcohol to a 500ml autoclave, add 0.5 grams of Raney nickel, 0.5 grams of SO 4 2- / TiO 2 Solid superacid, after nitrogen replacement, hydrogen pressure of 1 kg, temperature control 20-30 ° C, reaction for 60 minutes, filtration, gas phase detection, 130.2 grams of isopentenol, reaction 3-methyl-3-butene-1 Alcohol 137.05 grams, selectivity 95%, conversion rate 68.5%, yield 65.1%.
Embodiment 2
[0018] Add 200 grams of 3-methyl-3-buten-1 alcohol to a 500ml autoclave, add 1.5 grams of Raney nickel, 1.5 grams of SO 4 2- / ZrO 2 Solid superacid, after nitrogen replacement, hydrogen pressure of 1 kg, temperature control 20-30 ° C, reaction for 60 minutes, filtration, gas phase detection, 110.8 grams of isopentenol, reaction 3-methyl-3-butene-1 Alcohol 140.5 grams, selectivity 78.8%, transformation rate 70.25%, yield 55.4%.
Embodiment 3
[0020] Add 200 grams of 3-methyl-3-butene-1 alcohol into a 500ml autoclave, add 28 grams of Raney nickel, 2 grams of SO 4 2- / SiO 2 Solid superacid, after nitrogen replacement, hydrogen pressure of 1 kg, temperature control 20-30 ° C, reaction for 60 minutes, filtration, gas phase detection, 90.8 grams of isopentenol, reaction 3-methyl-3-butene-1 Alcohol 160.5 grams, selectivity 56.57%, conversion rate 80.25%, yield 45.4%.
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Abstract
The invention discloses a method for synthesizing prenol by composite catalyst. Generally, rare metals high in price and small in number of application times are used in the existing synthetic methods, and accordingly product cost is increased in industrial production, and product competitiveness is lowered. The method for synthesizing prenol by composite catalyst is characterized by using 3-methl-3-butene-1-ol as raw material, using composite catalyst composed of raney nickel and solid super acid, hydrogenating, and subjecting the 3-methl-3-butene-1-ol double-bond isomerization to synthesize prenol. The composite catalyst is easy to obtain, low in cost, large in number of application times, high in conversion rate and selectivity, low in reaction temperature and the like. Reaction temperature is low, and the method is low in energy consumption and meets the technological requirements on energy conservation and consumption reduction.
Description
technical field [0001] The invention relates to the field of chemical synthesis, in particular to a method for synthesizing isopentenol with a composite catalyst. Background technique [0002] Prenol, chemical name 3-methyl-2-buten-1-ol, molecular formula: C 5 h 10 O, molecular weight 86.13. Prenol is a colorless transparent liquid. Density 0.848, boiling point 140°C, refractive index 1.442-1.444, flash point 43°C, water solubility 170 g / L (20°C), insoluble in water, soluble in organic solvents such as alcohol and ether. Prenol is used in the synthesis of permethrin insecticides and other fine chemicals, and is an important raw material for the production of medicines or pesticides. [0003] At present, the main method for producing prenol is the isoprene method: that is, isoprene is used as raw material to produce prenol through processes such as chlorination, esterification, and saponification of alkaline solution. This method has a long process route, large consumpti...
Claims
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Application Information
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