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Process and device for increasing yield of acetone-hydrogenation isopropanol production

A technology of isopropanol and acetone, applied in the field of improving the yield of isopropanol produced by acetone hydrogenation, can solve the problems of high production cost, decreased yield of isopropanol, complicated operation, etc., and achieves energy saving, energy consumption reduction, The effect of avoiding environmental pollution

Active Publication Date: 2015-06-17
JIANGSU NINE HEAVEN HIGH TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since isopropanol forms a ternary azeotrope with water and acetone (acetone 8wt.%, isopropanol 81wt.%, water 11wt.%), traditional azeotropic distillation, extractive distillation and other dehydration separation processes are complicated to operate and cost It is too high and the environmental pollution is serious, so that the current manufacturers generally sell it as waste liquid, resulting in a decrease in the yield of isopropanol and high production costs

Method used

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  • Process and device for increasing yield of acetone-hydrogenation isopropanol production

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Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 Shown, a kind of acetone hydrogenation produces the device of isopropanol yield, comprises hydrogenation reactor C, the first rectification tower E, the second rectification tower F, the outlet of hydrogenation reactor C passes through gas The liquid separator D is connected to the first rectification tower E, the top outlet of the first rectification tower E is connected to the pervaporation device, and the retentate side of the pervaporation device G is connected to the feed port of the hydrogenation reactor C, and the permeation The retentate side of the vaporization device G is connected with a permeate tank I and a vacuum pump J, and the bottom outlet of the first rectification tower E is connected to the second rectification tower F, and the bottom of the second rectification tower F is isopropanol Evaporator A is installed in front of the hydrogenation reactor C at the material outlet, and the top outlet of the evaporator A is connected to the h...

Embodiment 2

[0030] use as figure 1In the device shown, the reaction raw material acetone (5000kg / h) enters the evaporator A to be vaporized, and the vaporized raw material stream 1 enters the superheater B to be further overheated, so as to prevent a small amount of entrained liquid foam from entering the hydrogenation reactor and causing catalyst damage. The superheated acetone steam 2 and hydrogen enter the hydrogenation reactor C together with the circulating hydrogen 12. The feed ratio of hydrogen and acetone is 2:1, and the hydrogenation reaction is carried out in the presence of a catalyst. The acetone mainly generates isopropanol and simultaneously generates Trace amounts of by-products such as diisopropyl ether, water and 4-methylpentanol. The effluent 3 of the reactor enters the gas-liquid separator D after being condensed, and the unreacted hydrogen is separated, and is compressed and used as the circulating hydrogen 4 for recycling. The condensate 5 is sent to the first recti...

Embodiment 3

[0033] use as figure 1 In the device shown, the reaction raw material acetone (5000kg / h) enters the evaporator A to be vaporized, and the vaporized raw material stream 1 enters the superheater B to be further overheated, so as to prevent a small amount of entrained liquid foam from entering the hydrogenation reactor and causing catalyst damage. The superheated acetone steam 2 and hydrogen enter the hydrogenation reactor C together with the circulating hydrogen 12. The feed ratio of hydrogen and acetone is 6:1, and the hydrogenation reaction is carried out in the presence of a catalyst. The acetone mainly generates isopropanol and simultaneously generates Trace amounts of by-products such as diisopropyl ether, water and 4-methylpentanol. The effluent 3 of the reactor enters the gas-liquid separator D after being condensed, and the unreacted hydrogen is separated, and is compressed and used as the circulating hydrogen 4 for recycling. The condensate 5 is sent to the first rect...

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Abstract

This patent relates to a process for increasing the yield of isopropanol by hydrogenation of acetone. The specific steps are as follows: After the acetone is evaporated, it is mixed with hydrogen and sent to the hydrogenation reactor. The reaction product isopropanol and other by-products are mixed with some unreacted After condensation and gas-liquid separation, acetone and hydrogen are sent to the rectification tower to separate the light components; the pervaporation membrane separation equipment is coupled with the light component separation tower to remove moisture, and the acetone is returned to the reactor to participate in the hydrogenation reaction, improving the Acetone conversion rate, reduce the loss of isopropanol. In the method of the invention, the conversion rate of acetone can reach 99.9%, the yield of isopropanol can reach 99.5%, and the process has no discharge of organic waste liquid, which significantly relieves the pressure on environmental protection.

Description

technical field [0001] This patent relates to a process for increasing the yield of isopropanol by hydrogenation of acetone. Background technique [0002] Isopropanol is an important chemical product and raw material with a wide range of uses. China is the largest importer of isopropanol in Asia. At present, the annual output of isopropanol in my country is about 160,000 tons. As the production of isopropanol is restricted by many factors such as raw material supply, production technology, and environmental protection, the domestic annual output is far less than annual market demand. In 2010, the import volume of isopropanol was 115,000 tons, and in 2011, the import volume of isopropanol was 100,000 tons. The direct hydration of propylene is the main method for industrial production of isopropanol. It is to hydrate propylene directly in the presence of a catalyst to generate isopropanol, while producing n-propanol by-product. Due to the shortage of domestic propylene resou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/10C07C29/145C07C29/80
Inventor 顾学红孔维芳余丛立庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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