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Method for preparing oleic acid by freezing and separating high-carbon fatty acid

A high-carbon fatty acid and freezing separation technology, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of shortened crystallization time, difficult purification, complex components, etc., and achieve good product quality, no three wastes, and high technology simple effect

Pending Publication Date: 2020-08-25
浙江嘉化能源化工股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Oil fractionation methods commonly used in industry include dry fractionation, solvent fractionation, and surfactant fractionation, etc. Dry fractionation is the simplest separation process, but the crystallization time of this fractionation is relatively long. The efficiency in actual production is low. In order to improve this situation, according to the distribution characteristics and crystallization characteristics of fatty acids, the crystallization process of fatty acids is improved from continuous cooling regardless of time period to rapid cooling, constant temperature, and slow cooling in several time periods. The unique stage crystallization method greatly shortens the crystallization time of fatty acids
[0003] The fractionation of fatty acids in industry generally adopts vacuum fractionation, which uses the difference in vapor pressure of different fatty acids for production. However, this method will produce industrial wastewater, which is an important source of pollution in waters. Therefore, it is an urgent need for energy saving and emission reduction in the chemical industry to develop and research new methods of freezing and fractionating fatty acids for industrial production.

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  • Method for preparing oleic acid by freezing and separating high-carbon fatty acid

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Embodiment 1

[0048] A method for preparing oleic acid by freezing and separating high-carbon fatty acids, comprising the following steps:

[0049] 1) Crystal breaking: heat the high-carbon fatty acid to 75-85°C, pump it into the crystallizer and stir for 15-30 minutes;

[0050] The purpose of this is to break the crystals. During the refining and transportation process, sometimes the oil temperature will be lower than the freezing point of the solid fat, and crystals will be precipitated. Because these crystals are precipitated during the non-uniform cooling process, the crystal forms are different, and the crystal grains are different. The size is different, and when it is transferred to the frozen crystallization stage, it will affect the uniform growth and maturity of the lipid crystals, and the crystals attached to the inner wall of the crystallizer and the coil after the last crystallization and filtration also need high-temperature raw materials for homogenization. This process is very...

Embodiment 2

[0070] A method for preparing oleic acid by freezing and separating high-carbon fatty acids, comprising the following steps:

[0071] 1) Crystal breaking: heat the high-carbon fatty acid to 80°C, pump it into the crystallizer and stir for 24 minutes;

[0072] 2) Rapid cooling: through the stirring device and tempering water, the oil temperature is reduced to 30°C by rapid cooling;

[0073] 3) Slow cooling: reduce the speed of the agitator to 15r / min, and use slow cooling to lower the oil temperature to 23°C;

[0074] 4) Constant temperature: when the temperature is slowly cooled to 23°C, keep the temperature at this temperature for 2.5 hours;

[0075] 5) Secondary slow cooling: at a temperature of 23°C (the set temperature during the constant temperature period, the same applies to other places), after a period of constant temperature, slowly cool the oil temperature to 17°C;

[0076] 6) Secondary constant temperature: when the temperature reaches 17°C, keep at this temperat...

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Abstract

The invention discloses a method for preparing oleic acid by freezing and separating high-carbon fatty acid. The method comprises the following steps: 1) crystal breaking: heating the high-carbon fatty acid to 75-85 DEG C, pumping the high-carbon fatty acid into a crystallizer, and stirring for 15-30 minutes; 2) quick cooling: cooling the oil temperature to 30 + / -2 DEG C by adopting a quick cooling mode; 3) slow cooling: reducing the rotating speed of the stirrer to 10-20 r / min, and reducing the oil temperature to 20-25 DEG C in a slow cooling manner; 4) keeping constant temperature for 2-3 hours; 5) secondary slow cooling: slowly cooling the oil temperature to 16-18 DEG C; 6) secondary constant temperature: maintaining the temperature for 2-3 hours; 7) slowly cooling for the third time: cooling to 14-16 DEG C; 8) crystal growing: maintaining for 2-3 hours; and 9) separating to obtain the oleic acid. The method for preparing the oleic acid through freezing and separating the high-carbon fatty acid has the advantages of being simple in process, low in energy consumption, good in product quality, free of any solvent, free of waste water and the like, and has the most important advantages that the product purity and yield are high, and no three wastes are generated.

Description

technical field [0001] The invention relates to the technical field of oleic acid preparation, in particular to a method for preparing oleic acid by freezing and separating high-carbon fatty acids. Background technique [0002] Oil fractionation methods commonly used in industry include dry fractionation, solvent fractionation, and surfactant fractionation, etc. Dry fractionation is the simplest separation process, but the crystallization time of this fractionation is relatively long. The efficiency in actual production is low. In order to improve this situation, according to the distribution characteristics and crystallization characteristics of fatty acids, the crystallization process of fatty acids is improved from continuous cooling regardless of time period to rapid cooling, constant temperature, and slow cooling in several time periods. The unique stage crystallization method greatly shortens the crystallization time of fatty acids. [0003] The fractionation of fatty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C57/12C07C51/42C07C51/43
CPCC07C51/42C07C51/43C07C57/12
Inventor 张伟张刚强步光跃郭永钢刘杰夏春张勇
Owner 浙江嘉化能源化工股份有限公司