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Purification method of isopropanol

A purification method, the technology of isopropanol, applied in the direction of separation method, chemical instrument and method, separation/purification of hydroxyl compounds, etc., can solve the problems of large investment in energy-consuming equipment, environment, product pollution, etc., and achieve increased production costs, Effect of increasing process energy consumption

Pending Publication Date: 2020-12-29
LINHAI LIANSHENG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] To sum up, the use of azeotropic distillation and extractive distillation technology with entraining agent not only pollutes the environment and products, but also requires the addition of organic solvent recovery devices to achieve continuous production, which requires a large investment in energy-consuming equipment

Method used

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  • Purification method of isopropanol
  • Purification method of isopropanol
  • Purification method of isopropanol

Examples

Experimental program
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Embodiment 1

[0085] This embodiment adopts figure 2 The purification device shown.

[0086] First, the crude product of isopropanol is separated from the top of the tower through acetone-removing rectification tower to separate light component acetone, the temperature at the top of the tower is 50°C, and the temperature at the bottom of the tower is 80°C.

[0087] Then, the crude product from the bottom of the acetone-removing tower is passed into the dehydration tower for continuous pressurized rectification, and the crude isopropanol containing a small amount of water is obtained from the bottom of the tower.

[0088] The temperature at the top of the dehydration tower is 100°C. The steam rising from the top of the tower is heated to the reboiler of the secondary dehydration tower. The uncondensed part of the gas phase is condensed by the condenser and enters the reflux tank. After being pressurized by the reflux pump, some Back to the dehydration tower. The other part of the isopropa...

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Abstract

The invention provides a purification method of isopropanol, which comprises the following steps: A) introducing an isopropanol crude product into an acetone removal tower for rectification to obtaina preliminary purified material at the tower kettle; b) introducing the preliminarily purified material into a dehydration tower for rectification to obtain partially dehydrated isopropanol at the tower bottom and isopropanol-water azeotrope steam at the tower top; introducing the isopropanol-water azeotrope steam into an auxiliary dehydration device for dehydration, and taking a product obtainedafter auxiliary dehydration as a raw material to be introduced into an acetone removal tower; and C) introducing the partially dehydrated isopropanol as a raw material into a product tower for rectification to obtain purified isopropanol. Compared with the prior art, the isopropanol purification process disclosed by the invention has the advantages of simple separation process, good product quality (no azeotropic agent pollution, low moisture and high purity) and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of chemical purification, in particular to a method for purifying isopropanol. Background technique [0002] At present, the industrial production methods of isopropanol mainly include hydration of propylene and hydrogenation of acetone. Propylene hydration methods can be divided into propylene indirect hydration methods and propylene direct hydration methods. However, due to the instability of the raw material price market, most of the propylene hydration methods are currently at a loss in the production of isopropanol. Almost all acetone in industry is obtained by the peroxidation of cumene (co-production with phenol). Due to the increase in market demand for phenol, a large amount of acetone is co-produced while producing phenol, resulting in an oversupply of acetone, making the price of acetone Less than the price of isopropyl alcohol. Therefore, the acetone hydrogenation method has a greater price adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C29/82C07C29/76C07C31/10B01D3/00B01D3/14B01D3/32
CPCC07C29/80C07C29/82C07C29/76B01D3/322B01D3/14B01D3/007C07C31/10Y02P20/10
Inventor 黄斌陈多安李燕虎李云旭吴文斌李生郑锡荣黄卫国姚素
Owner LINHAI LIANSHENG CHEM
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