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Synthesis method of disodium oleate

A technology of disodium oleic acid and synthesis method, which is applied in the field of synthesis of disodium oleic acid, can solve the problems of changing hydrophilicity and hydrophobicity, long reaction time, low mass transfer efficiency, etc., achieves changing hydrophilicity and hydrophobicity, and improving sulfonation rate and yield, solvents are cheap and easy to obtain

Active Publication Date: 2018-09-04
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of disodium salt by oleic acid According to conventional thinking, oleic acid directly reacts with sodium bisulfite under the action of a catalyst for sulfonation, and then neutralizes to obtain disodium salt of oleic acid, but the defect of this method is that the mass transfer efficiency is low , the reaction time is long and the yield is extremely low
The present invention uses methyl oleic acid to be esterified, and then adds ethylene oxide (EO) to greatly change the hydrophilicity and hydrophobicity of raw materials, improve mass transfer efficiency and sulfonation rate, and then obtain oil through saponification, acidification, extraction and separation, and neutralization. The method of acid disodium salt, retrieval has never been reported

Method used

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  • Synthesis method of disodium oleate
  • Synthesis method of disodium oleate
  • Synthesis method of disodium oleate

Examples

Experimental program
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Embodiment 1

[0026] Add 200g (0.708moL) of oleic acid, 46.2g (1.442moL) of anhydrous methanol and 10.02g of p-toluenesulfonic acid into a four-neck flask, stir at 65°C for 2 hours under reflux, and add sodium methoxide after the reaction to neutralize those not involved in the reaction p-toluenesulfonic acid, then wash with deionized water to remove excess salt, and finally carry out vacuum distillation to remove excess methanol to obtain methyl oleate; in the autoclave, add 100g methyl oleate and 1g catalyst, pass Inject nitrogen to replace the air in the reactor, then raise the temperature to 140°C and introduce 5g of ethylene oxide for the first time, and induce the reaction at a pressure of 0.3MPa, and then slowly introduce 215g of epoxy into the reactor after the pressure drops to 0.1MPa Ethane, when the pressure is constant and the reaction is complete, nitrogen gas is introduced when the temperature in the reactor drops to 70°C, and 320g of methyl oleate ethoxylate is exported; 51.7g...

Embodiment 2

[0028] Add 200g (0.708moL) oleic acid, 34.0g (1.062moL) anhydrous methanol and 4.00g p-toluenesulfonic acid into a four-neck flask, stir for 3 hours under reflux at 60°C, add sodium methoxide after the reaction to neutralize those not involved in the reaction p-toluenesulfonic acid, then wash with deionized water to remove excess salt, and finally carry out underpressure distillation to remove excess methyl alcohol to obtain methyl oleate; in the autoclave, add 100g methyl oleate and 1.5g catalyst, Pass nitrogen to replace the air in the reaction kettle, then raise the temperature to 120°C and introduce 3g of ethylene oxide for the first time, and carry out induction reaction at a pressure of 0.35MPa. After the pressure drops to 0.1MPa, slowly introduce 260g ring Oxyethane, until the pressure is constant and the reaction is complete, feed nitrogen when the temperature in the reactor drops to 80°C, and export 363g of methyl oleate ethoxylate; add 50.0g of methyl oleate ethoxylat...

Embodiment 3

[0030]Add 200g (0.708moL) oleic acid, 90.7g (2.832moL) anhydrous methanol and 8.00g p-toluenesulfonic acid into a four-neck flask, stir for 4 hours under reflux at 65°C, and add sodium methoxide to neutralize those not involved in the reaction p-toluenesulfonic acid, then wash with deionized water to remove excess salt, and finally carry out underpressure distillation to remove excess methyl alcohol to obtain methyl oleate; in the autoclave, add 100g methyl oleate and 1.5g catalyst, The air in the reaction kettle was replaced by nitrogen gas, then the temperature was raised to 140°C, and 8g of ethylene oxide was introduced for the first time, and the induction reaction was carried out at a pressure of 0.3MPa. After the pressure dropped to 0.1MPa, 227g ring Oxyethane, until the pressure is constant and the reaction is complete, feed nitrogen when the temperature in the reactor drops to 40°C, and export 335g of methyl oleate ethoxylate; add 50.0g of methyl oleate ethoxylate (0.05...

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Abstract

The invention relates to a synthesis method of disodium oleate. The synthesis method of the disodium oleate comprises the following steps: performing reaction on oleic acid, methanol and p-toluenesulfonic acid to obtain methyl oleate; performing addition on the methyl oleate and ethylene oxide to obtain methyl oleate ethoxylate; and performing sulfonated addition reaction on an intermediate product and sodium hydrogen sulfite to obtain methyl oleate ethoxylate sulfonate, performing saponification reaction, and performing extraction and separation on ethyl acetate and a saturated sodium chloride aqueous solution of 30 percent by weight to obtain the disodium oleate. The synthesis method of the disodium oleate has the following advantages: the raw materials are rich and can be regenerated, and the sulfonation rate is high; the solvent used in the preparation process is cheap, easily available and recyclable; and reaction is mild, energy consumption is low, sulfonation rate is high and yield is high.

Description

technical field [0001] The invention relates to a method for synthesizing oleic acid disodium salt. Background technique [0002] Conventional disodium salts mostly exist in the production process of fatty acid methyl ester sulfonate (MES), and have been neglected by scientists for a long time because they are regarded as by-products, so there are few reports on their research. The fact is that disodium salt has an amphiphilic head group, and MES disodium salt has a high Krafft point, good surface activity and foaming ability, so it also has the value and significance of research. On the other hand, oil prices continue to rise, and there are still problems in domestic α-olefin production. Under this premise, how to apply renewable resources to the chemical industry is also an important issue to be solved in promoting sustainable development. According to the structural characteristics of α-olefins, the research group thought of oleic acid, a renewable resource with a simil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/32C07C309/17
CPCC07C67/08C07C67/26C07C303/32C07C309/17C07C69/58
Inventor 孙永强丁莉荣周婧洁
Owner CHINA RES INST OF DAILY CHEM IND
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