Method for removing pesticide residues in natural extract

A technology for natural extracts and pesticide residues is applied in the field of purification of natural extracts, which can solve the problems of high critical temperature of propane, atmospheric environmental hazards, flammable and explosive propane, etc. Improve the effect of removal

Active Publication Date: 2012-10-03
CHENGUANG BIOTECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to public patent reports at home and abroad, there are many methods for removing pesticide residues, and using supercritical extraction technology to remove pesticide residues is a relatively new technology: 1. A method for removing pesticide residues in ginseng (publication number CN101156881A), mainly Use propane as a solvent to remove pesticide residues in solid ginseng powder; in this method, the critical temperature of propane (97°C) is not easy to reach, and propane is flammable and explosive, making it unsafe to use
2. A method for removing pesticide residues in ginseng (publication number CN101810658A), which mainly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: The method for removing pesticide residues in natural extracts takes the removal of pesticide residues in capsanthin as an example, and the specific process steps are as follows.

[0016] in supercritical CO 2 The extraction kettle (300L*2 supercritical device produced by Guangzhou Meichen High-tech Separation Technology Co., Ltd.) is placed in a rectangular saddle ring stainless steel random metal filler, and the amount added is 1 / 2 of the volume of the extraction kettle. Take 100kg of capsanthin and add 30kg of rapeseed oil (10:3) into the extraction kettle; use first static, then dynamic static and dynamic combined with supercritical CO 2 The fluid extraction method was used to boost the extraction, the static extraction pressure was 12MPa, and the time was 25min; the dynamic extraction pressure was 25MPa, the extraction was 5.0 hours, the extraction temperature was 50°C, CO 2 The flow rate is 1250L / h. Extracted CO 2 The solvent is analyzed, the primary...

Embodiment 2

[0018] Example 2: The method for removing pesticide residues in natural extracts takes the removal of pesticide residues in safflower oil as an example, and the specific process steps are as follows.

[0019] in supercritical CO 2 The extraction kettle (300L*2 supercritical device produced by Guangzhou Meichen High-tech Separation Technology Co., Ltd.) is placed in a rectangular saddle ring stainless steel random metal packing, and the amount added is 2 / 3 of the volume of the extraction kettle. Take 120kg safflower seed oil and add 10kg salad oil (12:1) into the extraction kettle; use supercritical CO 2 The fluid is subjected to boosted extraction, the static extraction pressure is 10MPa, the time is 30min, the dynamic extraction pressure is 30MPa, the extraction is 8.0 hours, the extraction temperature is 65°C, CO 2 The flow rate is 1350L / h. Extracted CO 2 The solvent is analyzed, the primary analytical pressure is 9MPa, the primary analytical temperature is 45°C, the seco...

Embodiment 3

[0021] Example 3: This method for removing pesticide residues in natural extracts takes the removal of pesticide residues in tomato red oleoresin as an example, and the specific process steps are as follows.

[0022] in supercritical CO 2 The extraction kettle (300L*2 supercritical device produced by Guangzhou Meichen High-tech Separation Technology Co., Ltd.) is placed in a rectangular saddle ring stainless steel random metal packing, and the amount added is 3 / 5 of the volume of the extraction kettle. Take 95kg of tomato red oleoresin and add 35kg of peanut oil (19:7) into the extraction kettle; use supercritical CO 2 The fluid is subjected to boosted extraction, the static extraction pressure is 15MPa, the time is 20min, the dynamic extraction pressure is 27MPa, the extraction is 5.5 hours, the extraction temperature is 55°C, CO 2 The flow rate is 1410L / h. Extracted CO 2 The solvent is analyzed, the primary analytical pressure is 8MPa, the primary analytical temperature i...

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PUM

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Abstract

The invention discloses a method for removing pesticide residues in a natural extract. The method comprises the following steps of adding a liquid natural extract containing the pesticide residues or a liquid natural extract mixed with edible oil into an extraction kettle; causing irregular random metal packing to be arranged in the extraction kettle; and extracting the pesticide residues in the liquid natural extract with a static and dynamic combined supercritical CO2 fluid extraction method, and then resolving a CO2 solvent to finally obtain the natural extract without the pesticide residues. According to the method, any organic solvent and toxic and harmful substances are not used as a remover. The method has the characteristics that the removing process is safe, and no secondary pollution exists. According to the method, the irregular random metal packing is added, so that the removing effect of the pesticide residues is effectively increased, and the phenomena of bias current, channeling and the like are avoided. The method has the characteristics of higher removal rate, simple and easy process and low production cost and is particularly suitable for removing organophosphorus, carbamates and pyrethroid pesticide residues in partial-fat soluble natural extracts.

Description

technical field [0001] The invention relates to a method for purifying natural extracts, in particular to a method for removing pesticide residues in natural extracts. Background technique [0002] Nowadays, advocating nature and returning to nature has become an irresistible historical trend worldwide. With the continuous improvement of people's living standards, people are more and more willing to spend money for safety and health. Products without pesticide residues are more and more popular. Dear friends, countries around the world, especially developed countries, attach great importance to the problem of pesticide residues, and have set increasingly strict limits for pesticide residues in various agricultural and sideline products. Many countries use pesticide residue limits as technical barriers to restrict the import of agricultural by-products and protect agricultural production. Therefore, the production of products that do not contain pesticide residues or meet th...

Claims

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Application Information

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IPC IPC(8): B01D11/04
Inventor 李凤飞李俊和杨文江孙国峰
Owner CHENGUANG BIOTECH GRP CO LTD
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