A kind of technique for continuous production of ricinoleic acid methyl ester

Abstract

The invention discloses a process for continuous production of ricinoleic acid methyl ester. The process flow is: after metering and preheating castor oil and alkali alcohol, a transesterification reaction occurs in a hydraulic cavitator and a static mixer. After the reaction, The feed liquid is sprayed and evaporated by electromagnetic heating to remove methanol, and then layered by a microwave-enhanced sedimentation device. The upper layer of ricinoleic acid methyl ester phase and the extractant glycerin are countercurrently extracted in the glycerin extraction tower, and the extracted ricinoleic acid methyl ester is passed through a high-vacuum Refined methyl ricinoleate is obtained by rectification; the lower glycerin phase is mixed with the glycerin at the bottom of the glycerin extraction tower, and then refined glycerin is obtained by high vacuum rectification, and part of it is reused in the glycerin extraction tower as an extractant. The present invention adopts electromagnetic heating spray evaporation to remove methanol, and realizes continuous rapid methanol removal; the feed liquid after microwave intensified sedimentation is easy to continuously stratify methyl ester and glycerin, which improves the process efficiency; Alkali catalyst in methyl sesoleic acid reduces the content of alkali catalyst in methyl ester.

Description

technical field [0001] The invention belongs to the technical field of biodiesel production technology, in particular to a technology for continuous production of methyl ricinoleate. Background technique [0002] Compared with traditional mineral energy, castor oil-based biodiesel has the advantages of renewable energy and environmental friendliness of biomass energy. Methyl ricinoleate is the main component of castor oil-based biodiesel. Its molecule contains hydroxyl groups, ester groups and double bonds, which can participate in various chemical reactions, so it is also an important Chemical raw materials. Homogeneous base-catalyzed transesterification is currently the main method for producing biodiesel. Castor oil-based biodiesel is produced by transesterification of castor oil and methanol, followed by demethanol, deglycerol and dealkalization. [0003] At present, the demethanolization and methanol recovery process is mainly realized through the methanol flash tower...

AI Technical Summary

Problems solved by technology

[0003] At present, the demethanolization and methanol recovery process is mainly realized through the methanol flash tower (CN103468413A, CN103215140A, CN 104651060A, CN 103468413A, etc.). Due to the heat transfer problem in the demethanolization process in the flash tower, the tower kettle will increase the amount of material due to local overheating. The formation of asphalt in the liquid affects the yield of methyl ester

Chinese patent CN101993778 uses a multi-layer evaporator to remove methanol, but there is still a problem that the material contacts the heating medium for a long time, and rapid methanol removal cannot be achieved

[0004] The deglycerinization process is mainly carried out in settling kettles (CN106479683A, CN108277090A, CN103013673B, etc.), and due to the high viscosity of glycerin, the settling process of glycerin often takes a long time

[0005] At present, the method of alkali catalyst removal mainly adopts water elution (Cheng Guoli, Yang Yunfeng, Wang Biaobing, et al. Preparation of biodiesel from castor oil and its performance research [J]. Grain and Oil Processing, 2007(8):77-79.), However, in the washing process, because there are hydroxyl groups on the ricinoleic acid molecule, and the reaction system also contains a small amount of product glycerin and a small amount of soap, the mixture of water and methyl ricinoleic acid is emulsified, and it is not easy to separate, so there is separation in the subsequent treatment of this process. Difficult, and at the same time produce a large amount of waste water and other problems

In industry, the feed liquid after transesterification is neutralized with acetic acid and alkaline catalyst, and then washed with water (Zhao Xuejing. Production technology and main application of ricinoleic acid methyl ester[J]. Grain Circulation Technology, 2012(5):39-41 .), which not only consumes acetic acid, but also produces waste water

Chinese patent CN102586012A uses glycerin as an extractant to remove the alkali catalyst in biodiesel through three single-stage extractions. Due to the low extraction efficiency and poor separation effect of single-stage extraction, the alkali metal content in castor oil-based biodiesel cannot be reduced. down to compliance requirements

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