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A technology of isopropanol and acetone, applied in the production field of isopropanol, can solve the problems of high investment, high energy consumption and high purity of isopropanol products, and achieves low investment, low process energy consumption and good heat exchange effect. Effect
Active Publication Date: 2021-06-25
SOUTHWEST RES & DESIGN INST OF CHEM IND
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The production method can overcome the defects of large energy consumption and high in
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Embodiment 1
[0032] Fill the adiabatic fixed-bed reactor with 12mL catalyst and pass through H 2 After three replacements, use a metering pump to inject liquid acetone into the preheater and heat it to 70°C, then drop it into the reactor from the top of the reactor, and react in H2 2 Under the following conditions, the reaction pressure is 1.5MPa, the reactor inlet temperature is 100°C, and the liquid space velocity is 1.2h -1 , the molar ratio of acetone to hydrogen is 1:10, and the reaction product is separated to obtain the product isopropanol through light removal, weight removal and dehydration. The purity of the product isopropanol is 99.93%, and the single-pass conversion rate of acetone is 98.2%. The property is 99.2% based on acetone.
Embodiment 2
[0034] Fill 12mL catalyst into the adiabatic fixed-bed reactor, pass H 2 After three replacements, use a metering pump to inject liquid acetone into the preheater and heat it up to 60°C, then drop it into the reactor from the top of the reactor, and react in H2 2 Under the following conditions, the reaction pressure is 2.5MPa, the reactor inlet temperature is 120°C, and the liquid space velocity is 0.8h -1 , the acetone-hydrogen molar ratio is 1:5, and the reaction product is separated by light removal, weight removal and dehydration to obtain the product isopropanol, with a purity of 99.92%, a single-pass conversion rate of acetone of 98.5%, and the selectivity of isopropanol calculated by acetone as 99.7% .
Embodiment 3
[0036] Fill 12mL catalyst into the adiabatic fixed-bed reactor, pass H 2 After three replacements, use a metering pump to inject liquid acetone into the preheater and heat it up to 60°C, then drop it into the reactor from the top of the reactor, and react in H2 2 Under the following conditions, the reaction pressure is 4MPa, the reactor inlet temperature is 90°C, and the liquid space velocity is 1.5h -1 , the acetone-hydrogen molar ratio is 1:8, and the reaction product is separated by light removal, weight removal and dehydration to obtain the product isopropanol, with a purity of 99.90%, a single-pass conversion rate of acetone of 98.8%, and the selectivity of isopropanol in terms of acetone is 99.4%. .
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Abstract
The invention discloses a method for producing isopropanol through acetone hydrogenation. The method comprises the following steps: preheating acetone and the like by using a metering pump, simultaneously introducing hydrogen, preheating the material, feeding the preheated material into a trickle bed reactor filled with a catalyst from the top of the reactor, cooling the product, feeding the cooled product into a hydrogenation high-pressure separation tank for carrying out gas-liquid separation, and returning the hydrogen containing uncondensed components to the reaction system through a circulating hydrogen compressor after fresh hydrogen is supplemented; and reducing the pressure of a liquid phase to be lower than 0.3 MPa in the hydrogenation low-pressure separation tank, cooling a part of reaction products, pumping the reaction products back to the reaction system for heat exchange by using an external circulating pump, feeding the rest reaction products to a separation section, and sequentially passing through a light component removal tower, a heavy component removal tower and a dehydration tower to obtain an isopropanol product with the purity of more than or equal to 99.9%. According to the method, isopropanol is produced through a gas-liquid-solid reaction, acetone does not need to be gasified before the reaction, the reaction temperature is low, the energy consumption is low, and the product selectivity is high. Compared with a shell-and-tube fixed bed reactor, the heat insulation bed reactor made of common stainless steel is low in investment and good in economic benefit.
Description
technical field [0001] The patent of the invention relates to the field of chemical technology, in particular to a production method of isopropanol. Background technique [0002] Isopropanol is a high-grade bactericidal disinfectant in medicine. Compared with ethanol, it is less irritating to the skin and is very popular in European and American markets. [0003] Isopropanol is also used to prepare acetone, isopropylamine, isopropyl acetate, isopropylphosphine, thymol, thymol, isopropyl ether, isopropanol fatty acid ester, etc. At the same time, isopropanol is also an important organic solvent, which can be used as a suspension or dispersion of coatings, paints, cosmetics, and a release agent; a processing solvent for plastics and resins; a detergent and desiccant in the film industry ; printing inks, pesticides and other preparations; car polishing paint, plastic color printing ink thinner; smears and fungicides in medicine; cleaning and degreasing of optical instruments; ...
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