Separation method used for preparing isopropanol via hydrogenation of acetone
A separation method, the technology of isopropanol, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as difficult separation by ordinary distillation, achieve simplified process, reduce equipment investment, and be easy to operate Effect
Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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Benefits of technology
This patented technology involves creating two types of chemicals: one with specific properties (light or color), which are extracted separately through different techniques like evaporation/distilling off gases during production). Another type called isoamylene is produced without any extra ingredients added. These processes simplify the overall manufacturing process while also minimizing costs associated therewith. Additionally, these technologies have fewer environmental concerns than traditional methods due to their use of less expensive solvents compared to other alternatives such as ethyleneglycoldimethyletherketones.
Problems solved by technology
Technologies described involve processes like making certain types of molecules (isocyan) through enzyme decomposition called biotransformation. These techniques require expensive materials and have limitations when trying to produce specific substances without generating excessive amounts of unwanted impurities. Therefore, new technological solutions are needed to overcome these issues while maintaining efficient yields of target molecules produced via conventional routes.
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[0036] Such as figure 1 Shown, acetone hydrogenation isopropanol separation method comprises the following steps:
[0037] (1) Refining: outlet stream of acetone hydrogenation reactor (mainly composed of 98% isopropanol, 0.84% acetone, 0.1% isopropyl ether, 0.5% water, 0.4% 4-methyl-2-pentanol, 0.01% propane , methane 0.1%, hydrogen 0.04%) are sent to the rectification tower 1, the number of theoretical plates of the rectification tower is 34, the reflux ratio is 5, the temperature at the top of the tower is 99°C, and the temperature at the bottom of the tower is 120°C. In this stream, isopropanol and water, isopropyl ether and water, acetone and water, isopropanol and isopropyl ether all form an azeotrope, which is extracted from the top of the tower with an azeotropic composition, and methane, hydrogen, propane and other light Components are also withdrawn overhead and vented as noncondensable gases. The output from the tower kettle is mainly heavy components such as 4-meth
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The invention discloses a separation method used for preparing isopropanol via hydrogenation of acetone. According to the separation method, an acetone hydrogenation product is subjected to azeotropic distillation and extractive distillation so as to obtain high-purity isopropanol. The separation method comprises following steps: (1) the acetone hydrogenation product is delivered into a rectifying tower for azeotropic distillation, an azeotrope is collected from the top of the rectifying tower, a heavier component is collected from a tower kettle of the rectifying tower, and an isopropanol product is collected from side lines of a tower body of the rectifying tower; (2) the azeotrope collected from the top of the rectifying tower is delivered into a recovery tower, and is subjected to extractive distillation using an extraction agent, a material flow containing acetone and isopropanol is collected from the top of the recovery tower, and is delivered back to a reactor for recycling, and an aqueous solution rich in the extraction agent is collected from a tower kettle of the recovery tower; and (3) the aqueous solution rich in the extraction agent is delivered into a dehydrating tower, and the extraction is collected from a tower kettle of the dehydrating tower, and is delivered back to the recovery tower. According to the separation method, azeotropic distillation and extractive distillation are adopted, high-purity isopropanol is prepared, raw material consumption is less, extraction agent loss is low, technical processes are simple, and operation is convenient.
Description
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