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A kind of method for preparing 2,2-dimethoxypropane

A dimethoxypropane, methanol technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as cumbersome operations, simplify the process, avoid low-temperature operation or the use of dehydrating agents, avoid The effect of post-processing

Active Publication Date: 2021-08-17
SHANDONG NHU VITAMIN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both of these two technical solutions require post-processing and separation of the product, and the operation is cumbersome.

Method used

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  • A kind of method for preparing 2,2-dimethoxypropane
  • A kind of method for preparing 2,2-dimethoxypropane
  • A kind of method for preparing 2,2-dimethoxypropane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As described, the tower reactor includes a raw material tank 1, a raw material pump 2, a first plate rectification tower 3, a second plate rectification tower 4, a third plate rectification tower 5, a feed heat exchanger 6, and a tower still Boiler 7, tower top condenser 8, tower bottom water collection tank 9, product collection tank 10 and emptying condenser 11. Wherein, the first plate rectification tower 3, the second plate rectification tower 4 and the third plate rectification tower 5 are connected in series in sequence. The raw material tank 1 stores the mixed solution of methanol and acetone, which is sent to the first plate rectifying tower 3 through the raw material pump 2 through the feed heat exchanger 6 for condensation reaction, and the mixture fraction generated by the reaction is condensed by the tower top condenser 8, It enters the second plate rectification tower 4 again from the top of the tower, and part of the mixture fraction is r...

specific Embodiment

[0035] The height of the plate distillation tower is 1.5m. The reaction tower is filled with strongly acidic styrene-based cation exchange resin, and the mixture of acetone and methanol (molar ratio = 1:2) enters the 1.5m tower from the side line (0.3m tower height). Inside, the feed flow rate is 1.25 mol / h in terms of methanol in the components. The overhead distillate is used as the feed to the next column to continue the reaction. Three identical columns are connected in series (total plate number N≈50×0.8×3=120, which is greater than the minimum theoretical reaction plate number N under the temperature and pressure min =113), control the pressure in the first tower successively to be 2.0kPa, the tower still temperature is 18°C, the reflux ratio R=0.6, the second tower inner pressure is 1.2kPa, the tower still temperature is 10°C, the reflux ratio R= 0.8, the pressure inside the third tower is 700Pa, the temperature of the bottom of the tower is 2°C, and the reflux ratio R...

Embodiment 2

[0038] Such as figure 2Said, the tower reactor comprises raw material tank 1, raw material pump 2, first plate rectification tower 3, second plate rectification tower 4, feed heat exchanger 5, tower still reboiler 6, tower top condenser 7. Tower kettle water collection tank 8, product collection tank 9 and emptying condenser 10. Wherein, the first plate rectification tower 3 and the second plate rectification tower 4 are connected in series. The raw material tank 1 stores the mixed solution of methanol and acetone, which is sent to the first plate rectification tower 3 through the raw material pump 2 through the feed heat exchanger 5 for condensation reaction, and the mixture fraction generated by the reaction is condensed by the overhead condenser 7, It enters the second plate rectification tower 4 again from the top of the tower, and part of the mixture fraction is refluxed in the first plate rectification tower 3 . The water generated by the reaction enters the water col...

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Abstract

The invention relates to a method for preparing 2,2-dimethoxypropane, comprising: carrying out azeotropic condensation reaction of methanol and acetone in a multi-tower series tower reactor, controlling the reaction pressure of the tower reactor at 700Pa~2.0KPa, the reaction temperature in the tower kettle is 2℃~18℃, and the azeotrope formed at the top of the tower is collected and separated to obtain 2,2-dimethoxypropane. The method enables the synthesis and separation of 2,2-dimethoxypropane to be simultaneously carried out in a tower reactor, avoiding complicated post-processing of the product.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a method for preparing 2,2-dimethoxypropane. Background technique [0002] 2,2-Dimethoxypropane (hereinafter referred to as DMP) is an important chemical intermediate, which is mainly used as hydroxyl protection agent, dehydrating agent, condensation agent, cyclization agent, etc., in the synthesis of medicine, pesticide, spices, etc. has a wide range of uses. [0003] There are mainly two strategies for industrial production and preparation of 2,2-dimethoxypropane, direct method and indirect method. The direct method is a more convenient and feasible method. [0004] The direct method mainly uses methanol and acetone to directly react to prepare DMP, and its chemical reaction equation is: [0005] [0006] The reaction is reversible with a small equilibrium constant. [0007] The document Preparation of Ketone Acetals from Linear Ketones and Alcohols, N.B.LOR...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/303C07C41/50
CPCC07C41/50C07C43/303
Inventor 赵德胜黄高峰刘早通李建清毛建拥
Owner SHANDONG NHU VITAMIN CO LTD
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