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Production method for synthesizing didodecyl carbonate

A production method and technology of lauric ester, applied in the production field of synthesizing dilauryl carbonate, can solve the problems of poor catalyst stability, reduced catalytic activity, high reaction temperature, etc., and achieve the effects of good stability, high activity and low reaction temperature

Inactive Publication Date: 2014-02-05
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above documents, it can be found that the reaction has the following disadvantages: the reaction is carried out in a device with a rectifying column, and the azeotrope that is distilled needs to be collected in the process, and lauryl alcohol is added under the protection of nitrogen, and the operation is more loaded down with trivial details; the reaction temperature is high , The reaction time is long; the stability of the catalyst is poor, and after repeated use several times, the catalytic activity will be significantly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepare magnesium-aluminum hydrotalcite, the molar ratio of magnesium salt and aluminum salt is 2:1, and roast at 300°C for 3 hours to obtain roasted magnesium-aluminum hydrotalcite; The mass ratio of the tin solution is 1:20, stirred and impregnated at 60°C for 2h, dried, and roasted at 400°C for 3h to obtain SnO 2 Modified magnesium aluminum hydrotalcite.

[0018] The transesterification reaction is carried out in a high-pressure reactor, and lauryl alcohol, dimethyl carbonate, SnO 2 Modified magnesium aluminum hydrotalcite, wherein the molar ratio of lauryl alcohol to dimethyl carbonate is 2, the catalyst (SnO 2 Modified magnesium aluminum hydrotalcite) dosage is 0.5% of the total mass of lauryl alcohol and dimethyl carbonate, filled with 1Mpa of N 2 , magnetically stirred and heated to 80°C, reacted at constant temperature for 1 h, and analyzed by gas chromatography, the conversion rate of dimethyl carbonate was 65%, and the yield of dilauryl carbonate was 60%. U...

Embodiment 2

[0020] Prepare magnesium-aluminum hydrotalcite, the molar ratio of magnesium salt and aluminum salt is 2:1, and roast at 300°C for 5 hours to obtain roasted magnesium-aluminum hydrotalcite; The mass of the tin solution (referred to as solid-liquid mass) ratio of 1:20 was stirred and impregnated at 60°C for 2h, dried, and roasted at 400°C for 5h to obtain SnO 2 Modified magnesium aluminum hydrotalcite.

[0021] The transesterification reaction is carried out in a high-pressure reactor, and lauryl alcohol, dimethyl carbonate, SnO 2 Modified magnesium aluminum hydrotalcite, wherein the molar ratio of lauryl alcohol to dimethyl carbonate is 2, the amount of catalyst is 0.5% of the total mass of lauryl alcohol and dimethyl carbonate, and it is filled with 1Mpa N 2 , magnetically stirred and heated to 80°C, reacted at constant temperature for 1 h, and analyzed by gas chromatography, the conversion rate of dimethyl carbonate was 75%, and the yield of dilauryl carbonate was 71%. Und...

Embodiment 3

[0023] Prepare magnesium aluminum hydrotalcite, the molar ratio of magnesium salt to aluminum salt is 2:1, and roast at 300°C for 5 hours to obtain the roasted magnesium aluminum hydrotalcite; prepare 6mmol / L tin sulfate solution, and set the solid-liquid mass ratio at 1:20 at 60°C Stir and impregnate for 2 hours under the same conditions, dry, and bake at 600°C for 5 hours to obtain SnO 2 Modified magnesium aluminum hydrotalcite.

[0024] The transesterification reaction is carried out in a high-pressure reactor, and lauryl alcohol, dimethyl carbonate, SnO 2 Modified magnesium aluminum hydrotalcite, wherein the molar ratio of lauryl alcohol to dimethyl carbonate is 2, the amount of catalyst is 0.5% of the total mass of lauryl alcohol and dimethyl carbonate, and it is filled with 1Mpa N 2 , magnetically stirred and heated to 80°C, reacted at constant temperature for 1 h, and analyzed by gas chromatography, the conversion rate of dimethyl carbonate was 73%, and the yield of di...

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Abstract

The invention provides a production method for synthesizing didodecyl carbonate. The production method concretely comprises the following steps: (1) preparing a metal oxide modified magnalium hydrotalcite catalyst; (2) sequentially adding lauryl alcohol, dimethyl carbonate and a catalyst to a high-pressure reaction kettle, closing, then pressurizing to needed pressure, magnetically stirring and heating to reaction temperature, reacting at constant temperature for a period of time, then cooling, and filtering the catalyst for analysis. The production method provided by the invention has the advantages of simple device, low reaction temperature, short reaction time, high raw material transformation ratio and product yield, high activity, good stability and easiness for recovery of the adopted catalyst, convenience for industrialized production and application, and the like.

Description

technical field [0001] The invention relates to a production method of dilauryl carbonate, in particular to a production method for synthesizing dilauryl carbonate from dimethyl carbonate and lauryl alcohol by catalyzing dimethyl carbonate and lauryl alcohol with magnesium aluminum hydrotalcite modified by metal oxides. Background technique [0002] Dilauryl carbonate (DDC for short) is a transparent oil or liquid with good lubricity, wear resistance and corrosion resistance. It is widely used in lubricating oil base oil, textile, polymer and other industries. The United States, Germany, Italy and other countries took the lead in researching long-chain dialkyl carbonates as lubricants. In addition, Italy and Japan produced lubricating oils containing long-chain dialkyl carbonates, such as internal combustion engine oils, hydraulic oils, refrigeration oils, etc. engine oil etc. The traditional synthesis method of dilauryl carbonate is mainly the phosgene method, but the raw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/96C07C68/06B01J23/14B01J23/745B01J23/75B01J23/755B01J23/835
CPCC07C68/06B01J23/007B01J23/14B01J23/745B01J23/75B01J23/755B01J23/835C07C69/96
Inventor 林加明周志伟武文良秦娟耿浩余倩
Owner NANJING UNIV OF TECH
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