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Process for preparing aliphatic ester

The technology of fatty acid ester and process method is applied in the field of preparation of fatty acid ester, can solve the problems of complex process and high energy consumption, and achieve the effects of improving conversion rate, improving selectivity and reducing energy consumption

Active Publication Date: 2010-07-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method is complicated in process, needs to be separated many times, and consumes a lot of energy.

Method used

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  • Process for preparing aliphatic ester
  • Process for preparing aliphatic ester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The reaction device is the same as in Comparative Example 1, but a 500mL glycerin settling tank is connected to the outlets of the 10th and 15th trays, and the ester phase after the glycerin is separated enters the next tray to continue the reaction after supplementing catalyst and monohydric alcohol. . On the first tray, feed oil 430g / h, 2.69% KOH-methanol solution 30g / h, respectively add methanol solution 25g / h and 9g / h on the 10th and 15th tray. After the product was flashed with methanol, the ester phase was analyzed, and it contained 0.9% monoglyceride, and no diglyceride and triglyceride were detected.

Embodiment 2

[0031] The reaction device is the same as Comparative Example 1, but on the 10th column plate, it is connected with such figure 2 In the 200mL glycerin settling tank shown in , the ester phase after the glycerol is separated enters the next tray to continue the reaction after replenishing the catalyst and monohydric alcohol. On the first tray, 430g / h of grease and 40g / h of 2.69% KOH-methanol solution are introduced, and 24g / h of methanol solution is added to the ester phase after separation of glycerin. After the product was flashed with methanol, the ester phase was analyzed, containing 1.2% of monoglyceride, 0.5% of diglyceride, and no triglyceride was detected.

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Abstract

This invention has provided one kind of technique method to prepare fatty acid ester, including: Provide the grease and monobasic alcohol for the response distillation reactor to do transesterification response, on the reactor, it connects with the reflux condenser, below the reactor, it connects with reboiler, between the reactor column trays, it at least connects with a glycerine settling tank to separate glycerine in the reactive mixture, and make the ester mixture after being separated glycerine to enter the next column tray to continue to respond, then collect the fatty acid ester from raw product in reboiler. This invention makes the transesterification response and the methyl alcohol recycling and the glycerine separation to be coupling, while enhances the conversion rate and selective of transesterification, the recycling energy consumption of methyl alcohol is reduced. According to this invention method, the highest respond conversion rate can reach 100%, the highest fatty acid ester selectivity exceeds 99%, after separating out glycerine, the product does not need to reduce pressure to distill the single alkyl ester, by processing laundering, after dehydration, it can betaken as the chemical product or fuel to use.

Description

technical field [0001] The invention belongs to the preparation method of fatty acid ester. Background technique [0002] Animal and vegetable oils and fats are mainly composed of triglycerides, which are transesterified with monohydric alcohols to produce monoalkyl fatty acid esters and glycerol. Fatty acid monoalkyl esters can be used as chemical raw materials and as diesel fuel, and the latter is biodiesel. [0003] Transesterification is a reversible reaction. When the molar ratio of alcohol to oil is not very high, the conversion rate of transesterification and the selectivity of the target product are both low. In order to improve the conversion rate and selectivity, a two-step process of separating glycerin is adopted abroad, that is, after one-step transesterification, a part of glycerin is separated by means of natural sedimentation, centrifugation, etc., and then monohydric alcohol and catalyst are added to continue the reaction, such as Germany. Both Scott's an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11C3/10
Inventor 胡见波闵恩泽杜泽学阳国军温朗友江雨生
Owner CHINA PETROLEUM & CHEM CORP
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