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Method for improving esterification reaction conversion rate of fatty acid

A fatty acid ester, esterification reaction technology, applied in fatty acid esterification, fatty acid chemical modification, fatty acid production and other directions, can solve the problems of frequent regeneration of adsorbents, increase operating costs, and high membrane prices, and achieve increased separation and purification loads. Highly hygroscopic, easy separation effect

Active Publication Date: 2021-06-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Adsorbent is used to absorb and separate water. In large-scale production, it is usually limited by the adsorbent’s ability to absorb water. Frequent regeneration of the adsorbent is required, which increases operating costs.
Reactive distillation to separate water, simultaneous condensation and reboiling will increase energy consumption, and more importantly, it is difficult to use fatty alcohols (such as ethanol) that form azeotropes with water
Selective separation membranes are often limited by problems such as high membrane prices and low membrane flux

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Ethanol and fatty acid (stearic acid, fatty acid content: 100%) are mixed at a molar ratio of 8:1, and sent into a tubular reactor for reaction. The reaction conditions are: 280°C, 10MPa, the volume space velocity of the fatty acid is 1h -1 . The reaction product is cooled to 100°C, and mixed with glycerin dehydrating agent in the packed tower countercurrently. The contents of glycerin and ethanol in the glycerin dehydrating agent are 80% and 20% respectively, the packing is corrugated wire mesh packing, and the glycerin dehydrating agent is 50% of the fatty acid mass. The dehydrated reaction mixture is mixed with ethanol again and sent to a tubular reactor for reaction. The molar ratio of ethanol to fatty acid is 8:1, the reaction temperature is 280°C, the pressure is 10MPa, and the volume space velocity of fatty acid is 1h -1 . The reaction product is flashed to separate ethanol under normal pressure conditions, and the conversion rate of the esterification reacti...

Embodiment 2

[0050] Solid acid catalyzed fatty acid (mixed fatty acid, and adding rubber seed oil to reduce acid value to 120mgKOH / g, fatty acid content is about 60%) reacts with methanol in a tower reactor. The solid acid catalyst is HZSM-5, the molar ratio of methanol to fatty acid is 3:1, the reaction temperature is 120°C, the pressure is 1MPa, and the volume space velocity of fatty acid is 0.5h -1 , Glycerin dehydrating agent is 70% of fatty acid mass. The contents of glycerin and methanol in the glycerin dehydrating agent are both 50%, and the fatty acid and the dehydrating agent are countercurrently mixed and reacted. The reaction product is distilled and separated from methanol under normal pressure conditions, and the conversion rate of fatty acid and methanol esterification is about 100%.

Embodiment 3

[0054] Butanol and fatty acid (stearic acid, fatty acid content: 100%) are mixed at a molar ratio of 4:1, and sent into a tubular reactor for reaction. The reaction conditions are: 240°C, 4MPa, the volume space velocity of the fatty acid is 0.2h -1 . After cooling down to 140°C, the reaction product was stirred and mixed with glycerin dehydrating agent, and separated by sedimentation. The glycerol content in the glycerin dehydrating agent is 100%, and the glycerin dehydrating agent is 20% of the fatty acid mass. The dehydrated reaction mixture is mixed with butanol again and sent to the tubular reactor for reaction. The molar ratio of butanol to fatty acid is 4:1, the reaction temperature is 240°C, the pressure is 4MPa, and the volume space velocity of fatty acid is 0.2h -1 . The reaction product is flashed to separate ethanol under normal pressure conditions, and the conversion rate of the esterification reaction of fatty acid and butanol can reach 92%.

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Abstract

The invention discloses a dehydrating agent and a method for improving the esterification reaction conversion rate of fatty acid. The method comprises the following specific steps: carrying out an esterification reaction on fatty acid and short-chain monohydroxy fatty alcohol to generate fatty acid alkyl ester and water, and separating the generated water by using a glycerol dehydrating agent so as to promote chemical reaction equilibrium, inhibit product hydrolysis and improve the conversion rate of the fatty acid. The glycerol dehydrating agent is used for separating the reaction byproduct water, the conversion rate of fatty acid is improved, and the method has the advantages of cheap and easily available dehydrating agent, simple separation, environmental friendliness and the like.

Description

technical field [0001] The invention relates to a preparation method of fatty acid monoalkyl ester, and belongs to the technical field of oleochemicals or biomass energy. More specifically, it relates to the esterification of fatty acid with short-chain monohydric alcohol to prepare fatty acid monoalkyl ester. Background technique [0002] Fatty acid monoalkyl esters are esters of long-chain fatty acids and short-chain monohydric alcohols. They have outstanding environmental performance and renewability, and are widely used. It can be used as diesel engine fuel, ie biodiesel, typically fatty acid methyl ester; or as a lubricity modifier for sulfur-poor diesel fuel (Chinese patent CN 1860209), and can also be used directly as a green solvent. At the same time, it is also an important basic chemical, which can be used as a raw material to prepare high-carbon alcohols, fatty acid ester sulfonates, fatty amides, alkanolamides, ethoxylated fatty acid methyl esters, sucrose fatty...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C67/58C07C69/24C11C3/00
CPCC07C67/08C07C67/58C11C3/003C07C69/24Y02E50/10
Inventor 张家仁王旻烜张佳候丹雪晶罗琛李金何皓孙立明李建忠
Owner PETROCHINA CO LTD
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