Low-temperature-freezing magnetic separation method and device for long-chain alkene and long-chain alkane mixture

A technology of alkane mixture and long-chain olefins, which is applied in chemical instruments and methods, purification/separation of hydrocarbons and hydrocarbons, etc., can solve the problems of waxy solids that are not easy to separate solid and liquid, high viscosity, and entrapped impurities in film layers, etc. To achieve the effect of easy solid-liquid separation and speed promotion

Inactive Publication Date: 2015-12-16
ZHONGBEI UNIV
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, falling-film crystallizers and kettle-type crystallizers are mostly used for cryogenic crystallization and separation. After cooling crystallization, sweating and purification, and then heating and thawing, the falling-film crystallizer mainly forms a crystallization film on the tube wall without solid-liquid separation. , but impurities are easily contained in the film layer. Although a small amount of impurities are discharged in the form of sweat by heating up and sweating, due to the high viscosity, most of the impurities are still trapped inside the crystal layer, reducing the purity of the product.
The advantage of the kettle crystallizer is that during the cooling crystallization process, stirring makes the liquid phase temperature more uniform. The disadvantage is that it is difficult to form crystal nuclei and waxy solids are not easy to separate solid-liquid, or the temperature changes during the solid-liquid separation process, causing partial condensation remelted into liquid

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  • Low-temperature-freezing magnetic separation method and device for long-chain alkene and long-chain alkane mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The structure and application method of the low-temperature freezing and magnetic separation device for long-chain olefin and alkane mixture.

[0024] Such as figure 1 As shown, the device includes a stirring mixer 1, a cooling system 2 and a magnetic separation system 3, wherein the stirring mixer 1 includes a double-layer jacket and a cylindrical cylinder 1-1, and the upper end of the cylinder is provided with a feeding port 1-3, the lower end is provided with a liquid discharge port 1-4, the cylinder is equipped with an agitator 1-8 driven by a motor 1-2, a jacket 1-7 is arranged on the periphery of the cylinder, and the lower end of the jacket 1-7 is provided with an inlet The liquid port 1-6, the upper end of the jacket 1-7 is provided with a liquid outlet 1-5; the cooling system 2 includes a high and low temperature circulating machine 2-1, a circulating pump 2-2, a circulating pump 2-2 and a stirring mixer 1 The lower end of the jacket 1-7 is connected to the li...

Embodiment 2

[0028] Add 10L of dodecene and dodecane mixture with an olefin content of 10% (mass ratio) to the stirring mixer, and then add 1kg of NiFe with a particle size of 500nm 2 o 4Powder, start the motor, stir to make NiFe 2 o 4 The powder is suspended in the oil phase. Set the cooling temperature to -20°C (note: the melting point of dodecane is -9°C, and the melting point of dodecene is -33°C), start the cooling system, and cool down the mixed liquid in the stirring mixer to -20°C Keep warm for 3 hours, stir at 50 rpm, discharge and collect the liquid after magnetic separation, and obtain a carbadodecene product with a content of 90%. Take out the magnetic waxy solid, place it at room temperature to melt to obtain dodecane.

Embodiment 3

[0030] Add 10L olefin content of 50% (mass ratio) tridecene and tridecane mixture to the stirring mixer, and then add 2kg of Fe with a particle size of 500nm 3 o 4 Powder, start the motor, stir to make Fe 3 o 4 The powder is suspended in the oil phase. Set the cooling temperature to -15°C (note: the melting point of tridecane is -5°C, and the melting point of tridecene is -23°C), start the cooling system, and cool down the mixed liquid in the stirring mixer to -15°C Left and right, heat preservation for 5 hours, the stirring speed is 60rpm, after magnetic separation, the liquid is discharged and collected, and the carbadodecene product with a content of 93% is obtained. Take out the magnetic waxy solid, and place it at room temperature to melt to obtain tridecane.

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Abstract

The invention relates to a low-temperature-freezing magnetic separation method for a long-chain alkene and long-chain alkane mixture. According to the low-temperature-freezing magnetic separation method, solid-liquid separation is easy to achieve, and product purity can be improved. Magnetic powder is added into the mixture liquid containing long-chain alkene and long-chain alkane, then mixed liquid containing the magnetic powder is cooled to be lower than the melting point of long-chain alkane and higher than the melting point of long-chain alkene, the long-chain alkane component is separated out and attracted to the surface of the magnetic powder to form magnetic waxy solid, the magnetic waxy solid is separated from unfrozen long-chain alkene liquid under the action of an external magnetic field, and after the magnetic waxy solid is taken out, molten liquid is heated to obtain long-chain alkane. The rate of freezing crystallization can be increased, solid-liquid separation is quite easy, and the high-purity product can be obtained. The method and device can be suitable for alkene separation of crude oil products and cutting oil obtained through Fischer-Tropsch synthesis in the coal chemical industry and separation and purification of mixed oil containing long-chain alkene in the petrochemical industry.

Description

technical field [0001] The invention relates to the separation of long-chain olefins and long-chain alkanes, in particular to a method and device for cryogenically magnetically separating long-chain olefins and alkane mixtures. Background technique [0002] Long-chain olefins (or high-carbon olefins) mostly refer to olefins containing more than 10 carbon atoms, and are divided into terminal olefins (α-olefins) and internal olefins according to the position of the double bond. Long-chain olefins can be used to produce olefin copolymers, lubricating oils, surfactants, oilfield chemicals and other products, which are widely used in petrochemical, light industry, textile, metallurgy, medicine, pesticide and other industries. However, the separation of long-chain olefin / alkane mixtures with the same number of carbon atoms is a major technical problem faced by petrochemical and coal chemical industries. Therefore, the separation of long-chain olefin / alkane mixtures is also a hot ...

Claims

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Application Information

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IPC IPC(8): C07C11/02C07C9/14C07C9/22C07C7/00
Inventor 李裕董秀芳薛泽慧李同川
Owner ZHONGBEI UNIV
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