A process and device for recovering butanone by pervaporation

A technology of recovering butanone and pervaporation, which is applied in the chemical industry, chemical instruments and methods, preparation of organic compounds, etc., can solve the problem of high energy consumption for separation, and achieve the effect of good recycling and small processing load.

Active Publication Date: 2015-09-02
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation efficiency of the extractant in the extraction process is the main reason affecting the energy consumption of the methyl ethyl ketone water system. Since an extraction agent with high separation efficiency cannot be found, the energy consumption of the separation is generally higher than that of the distillation process.

Method used

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  • A process and device for recovering butanone by pervaporation

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Embodiment 1

[0030] A kind of technology that pervaporation method reclaims butanone, comprises the following steps: the butanone raw material liquid that will be stored in raw material storage tank 1 and comes from reaction procedure, control flow rate is that 500kg / h is delivered to preheater 3, pass product steam to this The feed liquid is preheated to 70°C, and then enters the evaporator 4 for heating. The feed liquid is heated to 110°C and enters in the form of steam into 5 NaA molecular sieve membrane modules (each membrane module has an area of ​​7m 2 ) pervaporation membrane separation unit 5 formed in series for dehydration and separation. The pressure on the feed liquid side is 0.2MPa, and the pressure on the permeate side is controlled at 1000Pa. The water content of the feed liquid is concentrated and reduced to 0.1% through membrane separation, the feed liquid flows through the preheater 3 to preheat the feed liquid, and then condenses through the product condenser 11 and ente...

Embodiment 2

[0032] A kind of technology that pervaporation method reclaims methyl ethyl ketone, comprises the following steps: will be stored in raw material storage tank 1 and come from the methyl ethyl ketone raw material liquid of reaction procedure, control flow rate is 500kg / h and transport to preheater 3, pass finished product to the material The feed liquid is preheated to 60°C, and then enters the evaporator 4 for further heating. After the feed liquid is heated to 100°C, it enters into 8 PVA membrane modules (the area of ​​each membrane module is 8m 2 ) permeable membrane separation unit 5 formed in series for dehydration and separation. The pressure on the feed liquid side is 0.3MPa, and the pressure on the permeate side is controlled at 500Pa. The water content of the feed liquid is concentrated to 0.05% through membrane separation, and the feed liquid flows through the preheater 3 to preheat the feed liquid and then enters the product tank 12 through the product condenser 11 ....

Embodiment 3

[0034]A kind of technology that pervaporation method reclaims butanone, comprises the following steps: the butanone raw material liquid that will be stored in the raw material storage tank 1 and come from reaction process, control flow rate is that 800kg / h is sent to preheater 3, pass product steam to this The feed liquid is preheated to 75°C, and then enters the evaporator 4 for heating. The feed liquid is heated to 135°C and enters in the form of steam into 9 NaA molecular sieve membrane modules (each membrane module has an area of ​​8m 2 ) permeable membrane separation unit 5 formed in series for dehydration and separation. The pressure on the feed liquid side is 0.5MPa, and the pressure on the permeate side is controlled at 300Pa. The water content of the feed liquid is concentrated to 0.01% through membrane separation, and the feed liquid flows through the preheater 3 to preheat the feed liquid and then enters the product tank 12 through the product condenser 11. The wat...

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Abstract

The invention relates to a process for recovering butanone by a pervaporation method. The process specifically comprises the following steps of: pressing hydrous butanone solution in a preheater and an evaporator through a pump so that the hydrous butanone solution goes into a pervaporation membrane separation unit in the form of steam after reaching the predetermined temperature, thus obtaining high-purity butanone at the interception side of the pervaporation membrane separation unit, and putting the high-purity butanone into a product tank after the high-purity butanone is condensed by the preheater and a finished product condenser successively. The permeation side of the membrane separation unit is connected with the vacuum system; water and little butanone in the solution at the interception side penetrate through a pervaporation membrane in the form of steam, and then go into a liquid-liquid separator for standing and layering after being condensed by a penetrant condenser; the butanone phase of the upper layer goes into a storage tank and then goes into a raw material tank, while the water phase of the lower layer goes into a rectifying tower; butanone containing a certain content of moisture obtained at the top of the tower goes into the raw material tank; waste water obtained in a tower kettle is discharged from the bottom of the kettle. The process provided by the invention is simple in process, high in safety factor, low in investment on equipment, high in energy utilization rate, free of addition of the third component and high in recovery rate.

Description

technical field [0001] The invention relates to a process and a device for recovering methyl ethyl ketone by a pervaporation method, belonging to the application field of pervaporation membranes. Background technique [0002] Butanone, as an important chemical raw material, occupies an important position in the industry. At the same time, due to its strong dissolving ability for various cellulose, synthetic resins, oils, etc., it is an excellent solvent, often used as a solvent for various polymer compounds; it can also be used as a solvent for medicines, dyes, detergents, spices, Antioxidants and intermediates of some catalysts can also be used as developers after photolithography of integrated circuits in the electronics industry. [0003] In the production process of the pesticide imidacloprid, methyl ethyl ketone is used as a solvent in large quantities, and methyl ethyl ketone needs to be recovered after the reaction is completed. However, the water content of methy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C49/10C07C45/78
CPCC07C45/786C07C49/10Y02P20/10Y02P20/50
Inventor 顾学红石风强余从立庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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