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A kind of synthetic method of acrylic acid

A synthesis method and technology of acrylic acid, applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., can solve the problems of low conversion rate of propylene and low yield of methacrylate, so as to increase yield and promote , Improve the effect of reactivity

Active Publication Date: 2018-03-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Propylene conversion rate and methacrylate yield are low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Anhydrous and oxygen-free treatment of solvents. The dehydration process of tetrahydrofuran uses anhydrous Na 2 SO 4 Dry overnight, deoxygenate in the presence of Na and benzophenone in a distillation flask, tetrahydrofuran in the presence of Na and benzophenone, reflux at 75°C for 2 hours, and distill off the solvent for later use.

[0023] Preparation of metal Ni complex catalysts. Take 1.36gNi(cod) 2 Dissolve in 40ml tetrahydrofuran, add 2.06g 1,3-bis(diphenylphosphine)propane to the solution, then add 0.40g succinic acid, stir the resulting solution at 0°C for 90min, and filter with suction to obtain the metal Ni complex Catalyst, kept in the glove box for future use.

[0024] Preparation of ionic liquids. Dissolve 8.2g of N-methylimidazole and 21g of 3-bromopropylamine hydrobromide in 60ml of ethanol, and reflux for 24h under the protection of nitrogen to obtain a solution. After removing ethanol, add 5g of KOH and dissolve in 20ml of water to obtain a solutio...

Embodiment 2

[0027] Anhydrous and oxygen-free treatment of solvents. The dehydration process of tetrahydrofuran uses anhydrous Na 2 SO 4 Dry overnight, deoxygenate in the presence of Na and benzophenone in a distillation flask, tetrahydrofuran in the presence of Na and benzophenone, reflux at 75°C for 2 hours, and distill off the solvent for later use.

[0028] Preparation of metal Ni complex catalysts. Take 1.05gNi(cod) 2 Dissolve it in 50ml of tetrahydrofuran, add 4.58g of 1,3-bis(diphenylphosphine)propane to the solution, and then add 0.25g of succinic acid, stir the resulting solution at 0°C for 70min, and filter with suction to obtain the metal Ni complex catalyst , kept in the glove box for later use.

[0029]Preparation of ionic liquids. Dissolve 7.6g of N-methylimidazole and 18g of 3-bromopropylamine hydrobromide in 60ml of ethanol, and reflux for 24h under the protection of nitrogen to obtain a solution. After removing ethanol, add 3g of KOH and dissolve in 15ml of water to o...

Embodiment 3

[0032] Anhydrous and oxygen-free treatment of solvents. The dehydration process of tetrahydrofuran uses anhydrous Na 2 SO 4 Dry overnight, deoxygenate in the presence of Na and benzophenone in a distillation flask, tetrahydrofuran in the presence of Na and benzophenone, reflux at 75°C for 2 hours, and distill off the solvent for later use.

[0033] Preparation of metal Ni complex catalysts. Take 1.33gNi(cod) 2 Dissolve it in 60ml of tetrahydrofuran, add 5.56g of 1,3-bis(diphenylphosphine)propane to the solution, and then add 0.33g of succinic acid, stir the resulting solution at 15°C for 30min, and filter with suction to obtain the metal Ni complex catalyst , kept in the glove box for later use.

[0034] Preparation of ionic liquids. Dissolve 6.6g of N-methylimidazole and 15g of 3-bromopropylamine hydrobromide in 30ml of ethanol, and reflux for 24h under the protection of nitrogen to obtain a solution. After removing ethanol, add 3g of KOH and dissolve in 10ml of water to...

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Abstract

The invention discloses an acrylic acid synthesis method. The method comprises the step of directly synthesizing acrylic acid by using CO2 and ethylene as raw materials, tetrahydrofuran and an ionic liquid as solvents and a metal Ni complex as a catalyst, wherein the molar ratio of ethylene to CO2 is (1 to 0.5)-(1 to 5), preferably (1 to 1)-(1 to 4); the reaction temperature is 30-140 DEG C, preferably 40-130 DEG C; the reaction pressure is 0.5-6.0 MPa, preferably 1.0-5.5 MPa. In the method, acrylic acid is directly synthesized by using CO2 and ethylene as the raw materials. The method has the advantages of low reaction temperature, high product yield and the like.

Description

technical field [0001] The present invention relates to a kind of synthetic method of acrylic acid, specifically relate to a kind of 2 A method of directly synthesizing acrylic acid with ethylene as raw material. Background technique [0002] With the increasing dependence of modern society on petrochemical resources, increasing CO 2 The emission problem is not only an environmental problem, but has risen to the level of international relations and human survival and development. CO 2 The greenhouse effect caused by the rapid increase will seriously threaten the survival of human beings. Global energy shortages and CO 2 The increasingly serious environmental problems caused by it force people to find ways to solve these problems, so as to devote themselves to CO 2 processing utilization. The most direct CO 2 The treatment method is how to consume more CO 2 , to achieve CO 2 recycling to fundamentally solve CO 2 question. CO 2 The chemical utilization is to achiev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/15C07C57/04B01J31/22
CPCY02P20/54
Inventor 孙潇磊张志智尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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