A kind of method of rectification purification methoxyacetone

A technology of pure methoxyacetone and methoxyacetone, which is applied in the field of rectification and purification of methoxyacetone, can solve the problems of low reaction efficiency and equipment utilization, large one-time investment, and low rectification efficiency, etc., to improve equipment Effects of utilization rate and production efficiency, small initial investment, and high distillation efficiency

Active Publication Date: 2021-07-27
XIAN MODERN CHEM RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following two aspects problems in above industrialization route: (1) methoxyacetone rectification separation process needs to add water and carry out azeotropic rectification, can only obtain the methoxyacetone aqueous solution of content 62%
When it is used as a raw material to synthesize Jinduer or Duer, it needs to be dehydrated first, and then reacted, so that the reaction efficiency and equipment utilization rate are low; and every ton of methoxyacetone aqueous solution will increase about 380kg of waste water
(2) Industrialized azeotropic distillation equipment has a large initial investment, low equipment rectification efficiency, and high energy consumption: such as an azeotropic distillation tower with an annual output of 1,000 tons of 62% methoxyacetone aqueous solution: the tower diameter is 1200mm, and the tower height is 32m

Method used

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  • A kind of method of rectification purification methoxyacetone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The mixed solution of methoxyacetone-propylene glycol methyl ether with a mass percentage of methoxyacetone of 20% is preheated to 90°C through a spiral wound tube heat exchanger at a temperature of 40°C, and then passed through an infusion pump, flow rate After being heated to 120°C by the preheater, it continues to enter the atomizer, and the atomized vapor-liquid mixture enters the high-gravity rectification device, and the reflux ratio of the rectification equipment in the high-gravity rectification device is controlled to 6. The pressure is 0.4MPa, the content of methoxyacetone in the product is 95.5%, and it is extracted through the condenser to reach a qualified product; the recovery of propylene glycol methyl ether is applied mechanically.

Embodiment 2

[0019] The mixed solution of methoxyacetone-propylene glycol methyl ether with a mass percentage of methoxyacetone of 60% is preheated to 100°C through a spiral wound tube heat exchanger at a temperature of 60°C, and then passed through an infusion pump, flow rate After being heated to 130°C by the preheater, it continues to enter the atomizer, and the atomized vapor-liquid mixture enters the high-gravity rectification device, and the reflux ratio of the rectification equipment of the high-gravity rectification device is controlled to 3. The internal pressure is 0.2MPa, and the content of methoxyacetone in the product is 96%, which is extracted by the condenser to reach a qualified product; propylene glycol methyl ether is recovered and used mechanically.

Embodiment 3

[0021] The mixed solution of methoxyacetone-propylene glycol methyl ether with a mass percentage of methoxyacetone of 40% is preheated to 95°C through a spiral wound tube heat exchanger at a temperature of 50°C, and then passed through an infusion pump, flow rate After being heated to 120°C by the preheater, it continues to enter the atomizer, and the atomized vapor-liquid mixture enters the high-gravity rectification device, and the high-gravity rectification device is controlled to control the reflux ratio to 1, and the pressure 0.3MPa, the content of methoxyacetone in the product is 98%, and it is extracted through the condenser to reach a qualified product; propylene glycol methyl ether is recovered and used mechanically.

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Abstract

The invention discloses a method for rectifying and purifying methoxyacetone, which comprises the following steps: applying a high-gravity rectification device to the methoxyacetone rectification process, using an atomizer, a high-gravity rectification device, and a spiral winding tube Heat exchangers and their auxiliary equipment. The mixed solution of methoxyacetone-propylene glycol methyl ether is heated by the preheater, enters the atomizer for atomization, and sprays into the high-gravity rectification device after atomization. Water rectification separation. The method of the invention can obtain methoxyacetone with a content greater than 95%, and the recovery of propylene glycol methyl ether can be applied mechanically.

Description

technical field [0001] The invention relates to a method for purifying an intermediate, in particular to a method for rectifying and purifying methoxyacetone. Background technique [0002] Methoxyacetone is a low-toxic and high-efficiency ketone organic solvent, widely used in paints, coatings, daily cleaning, dyes, textiles, cement additives, pesticides and other industries. one. [0003] The industrialization route of methoxyacetone is to use propylene glycol methyl ether as raw material, and carry out dehydrogenation reaction in a fixed bed catalyst, and the primary conversion rate of propylene glycol methyl ether is 20%-60%; As a product collection, propylene glycol methyl ether recovery applies. Since the boiling point of methoxyacetone at normal pressure is 116°C and the boiling point of propylene glycol methyl ether is 120°C, the boiling points are close to each other, so it is difficult to separate them by conventional methods. In the actual industrial production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/82C07C49/175
CPCC07C45/82C07C49/175
Inventor 张晓光毛明珍宁斌科陈涛王威李秉擘王海洋杨翠凤
Owner XIAN MODERN CHEM RES INST
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