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Application of zeolite molecular sieve film in the separation of ethylidene dichloride-nitrogen mixture

A technology of zeolite molecular sieve membrane and dichloroethane, applied in the field of chemical engineering, can solve the problems of restricting industrial application, high energy consumption of high temperature desorption, bulky equipment, etc., and achieve the effect of simple equipment, energy saving and avoiding environmental pollution

Inactive Publication Date: 2003-11-05
DALIAN UNIV OF TECH
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Problems solved by technology

However, since the concentration of dichloroethane in the breathing gas of the dichloroethane storage tank in the vinyl chloride workshop is about 20% (mol), adopting the adsorption method to reclaim dichloroethane will inevitably require a large amount of adsorbent, resulting in huge equipment volume and high temperature desorption. High energy consumption and difficulty in cooling, restricting industrial application

Method used

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  • Application of zeolite molecular sieve film in the separation of ethylidene dichloride-nitrogen mixture
  • Application of zeolite molecular sieve film in the separation of ethylidene dichloride-nitrogen mixture

Examples

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Embodiment

[0015] Preparation of sol: Add 32g sodium hydroxide and 100ml water into a 400ml beaker, fully dissolve and add 44.8ml silica sol under vigorous stirring to obtain solution (a), then dissolve 16.7g aluminum sulfate in 110ml water to obtain solution (b) , and then slowly add the solution (b) dropwise to the solution (a) to form a white sol.

[0016] Carrier pretreatment: before synthesis, smooth the surface of the carrier with 400#, 600#, 800# sandpaper, then use ultrasonic vibration to wash away the suspended particles on the surface and pores, then soak in acid or alkali for 1-2 days, and ultrasonically wash until Neutral, tumble dry ready to use.

[0017] Membrane preparation: take the pretreated carrier tube, soak the surface of the carrier tube with citric acid, seal both ends of the tube with polytetrafluoroethylene film after treatment, put it vertically into a stainless steel crystallization kettle, and spread the sol along the tube wall Slowly add it into the kettle, ...

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Abstract

The present invention relates to the separation of organic macromolecular gas(es) and inorganic small molecular gas. The present invention features the sol compounded with Na2O, SiO2, Al2O3 and H2O in the molar ratio of 15-25 to 6.4-25.6 to 1 to 300-1500; the alpha-Al2O3 carrier tube, which is surface activated with organic acid or alcohol solvent before synthesis and then low temperature crystallized in hydrothermal condition for 20-36 hr to synthesize NaY zeolite molecular sieve film; the ion exchange of the NaY zeolite film in alkali or alkali earth solution at 60 deg.c for 4 hr to obtain KY, LiY, CaY, BaY and other zeolite film; and the film tube set inside film separator with pressure difference on two sides controlled in 10-100 KPa to result in the separating factor between dichloroethane and nitrogen of 20-80. The present invention has the features of simple apparatus and low power consumption.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and relates to the separation of organic macromolecular gas and inorganic small molecular gas mixture, in particular to the separation method of dichloroethane and nitrogen in the chlor-alkali industry. technical background [0002] At present, in the chlor-alkali plants of the petrochemical industry, in the process of producing PVC, there will be a large amount of storage and transmission of the intermediate product dichloroethane. Technically, nitrogen is used to seal dichloroethane, so a large amount of nitrogen saturated with dichloroethane will be produced. In the industry, it is usually emptied directly without recycling, thus causing air pollution and waste of resources. [0003] The technologies that can be used for the separation and recovery of dichloroethane from dichloroethane and nitrogen mixture mainly include condensation separation method, absorption method and adsorp...

Claims

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Application Information

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IPC IPC(8): B01D53/22B01D71/02C01B21/04C07C17/38C07C19/045
Inventor 王金渠郑彤李邦民
Owner DALIAN UNIV OF TECH
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