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Method for separating methanol and dimethyl carbonate azeotropic mixture

A technology of dimethyl carbonate and azeotropic mixture, applied in the field of separation of dimethyl carbonate, can solve the problems of product quality reduction, environmental pollution, high energy consumption, etc., and achieve the effect of complete separation

Inactive Publication Date: 2009-02-11
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The rectification method is used for the separation of azeotropic mixtures, which has many problems such as high energy consumption, many operating units, and the addition of extractant and azeotropic agent may easily cause product quality reduction and environmental pollution.

Method used

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  • Method for separating methanol and dimethyl carbonate azeotropic mixture
  • Method for separating methanol and dimethyl carbonate azeotropic mixture
  • Method for separating methanol and dimethyl carbonate azeotropic mixture

Examples

Experimental program
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Embodiment 1

[0020] The preparation of embodiment 1 NaY molecular sieve membrane

[0021] 38.01 grams of sodium hydroxide and 8.54 grams of NaAlO 2 Be dissolved in 236.9 grams of deionized water to obtain solution A; 188.55 grams of water glass (SiO 2 Content 27.3%) was mixed with 245.7 grams of deionized water to obtain solution B. Add solution A dropwise to solution B under vigorous stirring to obtain the precursor sol of NaY molecular sieve. After continuing vigorous stirring for 2 hours, it was aged at room temperature for 12 hours. The pre-coated α-Al with NaY molecular sieve seeds 2 o 3 Membrane tube (outer diameter 13mm, wall thickness 2mm, length 35cm, average pore diameter 1.0μm, porosity 38%) both ends are sealed with PTFE tape and vertically fixed in the synthesis reactor, the molecular sieve precursor sol is transferred in the reactor, Crystallization treatment was carried out for 5 hours in a blast oven preheated to 100°C. After the reaction, the molecular sieve membrane...

Embodiment 2

[0022] Example 2 Pervaporation separation of methanol and dimethyl carbonate

[0023] Figure 1 It is a schematic diagram of a pervaporation separation device for the separation of methanol and dimethyl carbonate in the present invention. The NaY molecular sieve membrane tube is placed in a stainless steel assembly, one end is connected to a small section of PTFE rod, the other end is connected to a vacuum system, and the two ends are sealed with a silicone rubber tube and a thermoplastic tube in sequence, and the outside of the assembly is wrapped with a heating tape. The raw material liquid heated to 50°C in the constant temperature tank is circulated and supplied in the module through the liquid pump, and liquid N is used for permeating steam. 2 Condensation is recovered, and two cold traps are switched to ensure continuous measurement. The permeate collected by condensation is weighed with an electronic balance, and the concentrations of the raw material liquid and the p...

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Abstract

The invention provides a new method for separating azeotropic mixture of methanol and methyl carbonate. The invention is characterized in that the mixed solution of methanol and methyl carbonate is supplied in circulation at the upstream side of molecular sieve membrane, and the downstream side of the molecular sieve membrane is connected to a vacuum system. As the molecular sieve membrane has the very high permselectivity for methanol, methanol in mixed solution preferentially permeates through the molecular sieve membrane, and vaporization and desorption are carried out at the downstream side of membrane, and then methanol is condensed and collected by the vacuum system. After multiple circulations, the mixed solution can achieve the complete separation of methanol and methyl carbonate. Compared with the traditional rectification method, the method of the invention has advantages of low energy consumption, no pollution, compact device, high separation efficiency, and the like, and has a very important meaning for industrial production of methyl carbonate and the preparation of other organic chemical materials by using methyl carbonate.

Description

technical field [0001] The invention provides a new method for separating methanol and dimethyl carbonate azeotrope, belonging to the technical field of separation of dimethyl carbonate Background technique [0002] Dimethyl carbonate (dimethyl carbonate, referred to as DMC) is a new type of green chemical product that has been widely concerned in the chemical industry at home and abroad in the past ten years. It can be used for carbonylation, carbonyl methoxylation and methylation reactions, and can replace The widely used highly toxic phosgene, methanol chloroformate and dimethyl sulfate are called "new building blocks in the field of organic synthesis in the 21st century". It is widely used in pesticides, medicines, polymer synthesis, fuel additives and solvents. The early dimethyl carbonate (DMC) was mainly synthesized through the phosgene route. The large-scale production and application of DMC were limited due to the high toxicity of raw gas and the corrosiveness of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/96C07C68/08C07C31/04C07C29/74B01D61/36B01D71/02
Inventor 张小明雷骞吕高孟索继栓
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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