Azeotrope separation process

An azeotrope and process technology, applied in the field of azeotrope separation and purification, can solve the problems of high investment and operating costs, large number of theoretical plates and reflux ratio, etc., and achieve high recovery rate, low pollution, and high product purity. Effect

Active Publication Date: 2016-12-07
烟台国邦化工机械科技有限公司
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Problems solved by technology

[0002] In the separation of petrochemical products, it is often necessary to separate two products with very close boiling points. If ordinary distillation methods are used, the number of theoretical plates and reflux ratio required are large, and the investment and operating costs are high.

Method used

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  • Azeotrope separation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw materials after pretreatment are mainly acetonitrile, water

[0027] The raw material first enters the extraction kettle 3, then adds the extractant, starts to stir for a certain period of time, and then stands still to separate the phases, and the water phase is extracted to the wastewater treatment section; the oil phase is transferred to the rectification kettle 1, and passes through the rectification kettle reboiler 15 After heating, the vapor phase rises into the rectifying tower 2, and is condensed by the tower top condenser 11. After the total reflux at the top of the tower is stable, according to the analysis results of the tower top product, a suitable reflux ratio is set, and the front fraction (extractant) is first extracted. The azeotrope with water, the transition fraction of extractant and acetonitrile), as the extractant can be recycled with the next batch of return to the extraction tank; then the acetonitrile product is extracted to the product r...

Embodiment 2

[0029] The raw materials after pretreatment are mainly dichloromethane and methanol

[0030] The raw material first enters the extraction kettle 3, then adds the extractant, starts to stir for a certain period of time, and then stands for phase separation. After the phase separation, an oil phase (dichloromethane product) and an aqueous phase (aqueous methanol solution containing a small amount of dichloromethane) are obtained. The water phase (aqueous methanol solution containing a small amount of dichloromethane) is transferred to the rectifying still 1, and after being heated by the rectifying still reboiler 15, the vapor phase rises into the rectifying tower 2 and is condensed by the overhead condenser 11. After the total reflux at the top of the tower is stable, an appropriate reflux ratio is set according to the analysis results of the top product, and the former fraction (dichloromethane / methanol / water), methanol, and water are sequentially extracted; water can be recycl...

Embodiment 3

[0032] The raw materials after pretreatment are mainly toluene and methanol

[0033] Through the extraction kettle 3, liquid-liquid extraction is carried out, and after phase separation, the toluene product is obtained; the water phase is the methanol aqueous solution and transferred to the rectification kettle 1, and after being heated by the rectification kettle reboiler 15, the vapor phase rises to the rectification tower 2 Inside, through the tower top condenser 11 condensation, after the total reflux at the top of the tower is stable, according to the analysis result of the tower top product, a suitable reflux ratio is set, and a small amount of front cut, methanol product, and transition cut (methanol and water) are successively extracted; After methanol is not contained in the distillation tower 2 overhead distillate, the heating can be stopped. The process wastewater in the kettle can be used as the extractant circulating water of this process after cooling.

[0034] ...

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Abstract

An azeotrope separation process includes the steps: 1) adding raw materials into an extraction kettle, adding extraction agents, stirring the raw materials for a certain time, standing and separating the raw materials into a water phase and an oil phase; 2) transferring one of the water phase and the oil phase into a rectifying still, heating the raw materials by a rectifying still reboiler and enabling a vapor phase to rise into a rectifying tower; 3) condensing the vapor phase rising to the top of the rectifying tower into liquid, setting a suitable reflux ratio after total reflux stabilization, extracting over heads, then extracting products and finally extracting intermediate cut. The azeotrope separation process combines the advantages of batch rectification and extraction rectification, and is flexible in operation, good in stability, low in equipment investment and applicable to separation of a azeotropic system and a near-boiling system.

Description

technical field [0001] The invention relates to an azeotrope separation process, which belongs to the field of azeotrope separation and purification. Background technique [0002] In the separation of petrochemical products, it is often necessary to separate two products with very close boiling points. If ordinary distillation methods are used, the number of theoretical plates and reflux ratio required are large, and the investment and operating costs are high. [0003] Extractive distillation is a special distillation separation technology, which is suitable for the separation of azeotropic systems. The purpose of separation is achieved by continuously adding extractant to the top of the rectification tower to change the relative volatility between the original components. By combining extraction and rectification, it combines the advantages of batch rectification and extractive rectification, with flexible operation, small equipment investment, and cost savings. It is sui...

Claims

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Application Information

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IPC IPC(8): B01D3/14B01D11/04
CPCB01D3/14B01D11/04
Inventor 张春灵毛学峰李晓宁杨国举于秀刚李小刚
Owner 烟台国邦化工机械科技有限公司
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