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Method for producing pesticide green solvent from rice bran oil

A green solvent and rice bran oil technology, applied in the direction of fat production, fat oil/fat refining, fatty acid esterification, etc., can solve the problems of difficult removal of sulfuric acid, easy poisoning of catalyst, high price, etc., so as to avoid saponification and improve catalysis Effect, the effect of reducing the loss of raw materials

Inactive Publication Date: 2016-08-24
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] So far, the methods involved include solid superesterification, ionic liquid catalyzed esterification of rice bran oil with high acid value, acid-base combined transesterification process, etc. The solid acid catalyst overcomes the problem of difficult removal of sulfuric acid in the traditional process, but Solid acid catalyzed esterification also has certain disadvantages, such as the catalyst is easily poisoned, regeneration is difficult, and the ionic liquid catalytic method has mild conditions and less pollution, but is expensive. The acid-base combined transesterification process is the most commonly used method, but the intermediate The treatment process is cumbersome, the amount of wastewater is large, and improper treatment is easy to saponify

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. First, add rice bran oil and methanol to the reaction device in a molar ratio of 1:6, preheat to 40°C, add concentrated sulfuric acid with 0.5% rice bran oil quality as a catalyst, raise the temperature of the reaction system to 60°C, and esterify at 60°C reaction for 3 hours;

[0030] 2. Put the esterified product in 1 into the transesterification device, control the flow rate of 10mL / min and add a certain amount of sodium hydroxide alcohol solution, control the reaction temperature at about 60°C, and conduct the transesterification reaction for 2 hours to realize the transesterification reaction;

[0031] 3. Put the product after the transesterification reaction in 2 into the liquid separation tank, and the upper oil layer is flashed to remove the remaining methanol solvent, then enters the water washing tank, and then enters the vacuum distillation tower for distillation to obtain a green solvent; the lower water washing layer enters the digestion The recovery tan...

Embodiment 2

[0033] 1. First, add rice bran oil and methanol to the reaction device in a molar ratio of 1:6, preheat to 40°C, add concentrated sulfuric acid with a mass of 0.8% rice bran oil as a catalyst, and raise the temperature of the reaction system to 60°C. reaction for 3 hours;

[0034] 2. Put the esterified product in 1 into the transesterification device, control the flow rate of 10mL / min and add a certain amount of sodium hydroxide alcohol solution, control the reaction temperature at about 60°C, and conduct the transesterification reaction for 2 hours to realize the transesterification reaction;

[0035] 3. Put the product after the transesterification reaction in 2 into the liquid separation tank, and the upper oil layer is flashed to remove the remaining methanol solvent, then enters the water washing tank, and then enters the vacuum distillation tower for distillation to obtain a green solvent; the lower water washing layer enters the digestion The recovery tank, the hot wate...

Embodiment 3

[0037] 1. First, add rice bran oil and methanol to the reaction device in a molar ratio of 1:8, preheat to 40°C, add concentrated sulfuric acid with 0.5% rice bran oil quality as a catalyst, raise the temperature of the reaction system to 60°C, and esterify at 60°C reaction for 3 hours;

[0038] 2. Put the esterified product in 1 into the transesterification device, control the flow rate of 10mL / min and add a certain amount of sodium hydroxide alcohol solution, control the reaction temperature at about 60°C, and conduct the transesterification reaction for 2 hours to realize the transesterification reaction;

[0039] 3. Put the product after the transesterification reaction in 2 into the liquid separation tank, and the upper oil layer is flashed to remove the remaining methanol solvent, then enters the water washing tank, and then enters the vacuum distillation tower for distillation to obtain a green solvent; the lower water washing layer enters the digestion The recovery tan...

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Abstract

The invention discloses a method for producing a pesticide green solvent from rice bran oil, comprising the following steps: (1), by using acidic catalytic esterification and synchronous water removal technology, reducing generated water of a reaction system, promoting forward reaction and improving esterification yield; (2), controlling flow, adding sodium hydroxide alcoholic solution to prevent saponification due to excessive local alkali concentration, reduce material loss and improve product quality; (3), post-treating a product: removing residual methanol solvent from an oil layer by flashing, and distilling in a vacuum distiller to obtain the green solvent. The method has the advantages that methanol for use herein is used as a material for esterification of the green solvent, the methanol is a reactant and is also a diluent and reflux solvent, water is carried in the esterification process by refluxing and circulating, generated water of the reaction system is decreased, and product esterification rate is greatly increased. The technology used herein is a low-cost green integrated novel technology for producing green solvents from biomass.

Description

technical field [0001] The invention relates to a method for producing a green solvent for pesticides from rice bran oil, in particular to a method for producing the green solvent by using rice bran oil as a raw material to catalyze esterification, synchronous water removal, continuous transesterification and other technologies. Background technique [0002] Rice bran is the part with the highest oil content in rice grains (9%-22% oil). Therefore, it is a potential bulk oil source. my country is the world's largest producer of rice, and its output accounts for 1 / 3 of the world's output, so rice bran oil is extremely rich in raw materials. The annual output of paddy in my country is about 200 million tons, while the annual output of rice bran as a by-product of paddy processing is more than 18 million tons. At present, except that a small amount of rice bran is used to extract oil in southern my country, the rest are all used as low-quality feed. Almost all the rice bran o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C11C3/10C11B3/00
CPCC11C3/04C11B3/001C11C3/10
Inventor 丁雪峰徐玉龙刘艳华张明慧王钰杰
Owner JILIN UNIV
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