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Method for simultaneously synthesizing dialkyl carbonate and acrylic acid analog aliphatic diol diester

A technology of dialkyl carbonate and aliphatic diol, which is applied to the preparation of organic carbonates, chemical instruments and methods, and carboxylate preparations, and can solve problems such as low added value, increased production costs, and difficulties in product separation and purification. Achieve the effect of increased product purity, high conversion rate, and improved atom economy

Inactive Publication Date: 2008-10-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome prior art when synthesizing dialkyl carbonate and acrylic fatty glycol diester, all can produce the by-product with low added value, cause product separation and purification difficulty, make the defect that production cost increases greatly, Thereby provide a kind of method of simultaneously synthesizing dialkyl carbonate and acrylic fatty diol diester

Method used

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  • Method for simultaneously synthesizing dialkyl carbonate and acrylic acid analog aliphatic diol diester
  • Method for simultaneously synthesizing dialkyl carbonate and acrylic acid analog aliphatic diol diester
  • Method for simultaneously synthesizing dialkyl carbonate and acrylic acid analog aliphatic diol diester

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Experimental program
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Effect test

Embodiment 1

[0029] The transesterification reaction of the present invention is carried out in a stainless steel reactor equipped with a thermocouple, an agitator and a distillation column, and the distillation column is provided with a condensation reflux head.

[0030] With ethylene carbonate (compound as shown in general formula I, in the formula R 1 and R 2 Both are H) and methyl methacrylate (as the compound shown in general formula II, where R 3 and R 4 Both CH 3 ) into the reactor at a molar ratio of 1:4, and then add the catalyst LiOCH which accounts for 3wt% of the total weight of the carbonic acid ester compound and the acrylic acid alkyl ester compound 2 CH 3 , and accounting for 0.5wt% of the polymerization inhibitor three (2,2,6,6-tetramethylpiperidinol nitroxide free radical) phosphite, the above mixture was reacted at 150°C for 9h, while reacting, it was distilled Dimethyl carbonate is separated at any time; after the reaction is completed, a mixture of dimethyl carbon...

Embodiment 2～8

[0033] According to the method of Example 1, transesterification reactions under different conditions were carried out, and the reaction conditions and results are listed in Table 1 and Table 2 respectively.

[0034] Table 1, transesterification reaction conditions

[0035]

[0036] In the table, a represents three (2,2,6,6-tetramethylpiperidinol nitroxide radicals) phosphite, b represents 2,2,6,6-tetramethylpiperidinol nitroxide radicals .

[0037] Table 2, transesterification reaction results

[0038]

[0039] As can be seen from the results in Table 2, the transesterification reaction carried out by the method provided by the invention has a high conversion rate of the raw material and good selectivity of the product.

[0040] Embodiment 9 and 10 and comparative example 1~3, use different polymerization inhibitors to carry out transesterification reaction

[0041] Use different polymerization inhibitors, carry out transesterification reaction by the method for embo...

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Abstract

This invention relates to a method for simultaneously synthesizing dialkyl carbonate and acrylic aliphatic glycol diester, wherein: mix olefinic carbonate compounds, alkyl-acrylate compounds, catalyst, and polymerization inhibitor and react at 100-200Deg C for 4-12h, simultaneously separate dialkyl carbonate by distillation, after finishing the reaction, it can obtain the mixture of dialkyl carbonate and acrylic aliphatic glycol diester in the reactor, then it can obtain the two products respectively by conventional vacuum distillation purification. By using this invented method, it can simultaneously synthesize dialkyl carbonate and acrylic aliphatic glycol diester without other byproducts, which greatly improves the atomic economics of the reaction.

Description

technical field [0001] The invention relates to a method for simultaneously synthesizing dialkyl carbonate and acrylic fatty diol diester. Background technique [0002] Dialkyl carbonate, especially dimethyl carbonate, is an important green chemical raw material and organic chemical intermediate, and has become a research hotspot at home and abroad in recent years. U.S. Patent No. 4,661,609 discloses a method for synthesizing dimethyl carbonate using ethylene carbonate (or propylene ester) and methanol transesterification, which employs zirconium, a soluble salt or complex of titanium and tin as a catalyst for transesterification . Chinese patent CN1380140A discloses a method for synthesizing dimethyl carbonate using alkali metal and alkaline earth metal solid catalysts. But above-mentioned method all can produce equimolar by-product---ethylene glycol (or propylene glycol) when reacting, causes product separation and purification difficulty, has also reduced the ability of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/96C07C69/54C07C68/06C07C67/02C07C67/28
Inventor 高俊杰李会泉张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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