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Apparatus and method for purifying excellent-grade dioxane in dioxane aqueous solution

A dioxane and aqueous solution technology, applied in the field of membrane separation, can solve the problems of high energy consumption, waste of resources and high energy consumption, and achieve the effects of improving economic benefits, good sealing effect and high mass transfer efficiency

Active Publication Date: 2019-09-20
CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dioxane and water form an azeotrope. The commonly used industrial treatment method is cooling separation + incineration, which will generate a certain amount of waste gas. This treatment method has problems such as accumulation of by-products, waste of resources, and environmental pollution.
[0005] Since dioxane and water form an azeotrope, the conventional treatment method is to add an entrainer to destroy the azeotrope of dioxane and water to form a new binary azeotrope, and then pass the new binary azeotrope through the variable However, this method has two towers of rectification, the rectification operation process consumes a lot of energy, lacks the problem of environmental protection and high-efficiency entrainer, and has not been widely used in industry
[0006] It has been reported in the literature that pervaporation is used to separate dioxane-water mixtures. However, pervaporation uses the principle of dissolution and diffusion. The water that passes through the membrane still contains a certain amount of dioxane. The permeated water cannot be discharged directly. Further treatment is required. In addition, pervaporation cannot make full use of the heat in the process, and the energy consumption is high

Method used

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  • Apparatus and method for purifying excellent-grade dioxane in dioxane aqueous solution

Examples

Experimental program
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Effect test

Embodiment 1

[0031]Example 1: A device for purifying high-grade dioxane in an aqueous solution of dioxane, including a membrane still 6, two sets of rectification towers, a booster pump feed mixer 1, a booster pump 3, and feed preheating Device 4 and steam condenser 13;

[0032] The membrane still 6 includes a membrane still cylinder, a membrane module 7, an orifice 8 and an upper head 9; the inside of the membrane still cylinder is provided with a membrane module 7, and the membrane module 7 is a special inorganic molecular sieve pervaporation membrane The module can be preferably a silicon-aluminum molecular sieve. Several through holes are evenly opened on the orifice plate 8. The top of the membrane module passes through the through holes and is fixed to the orifice plate 8 by bolts. The top of the cylinder of the membrane still An upper head 9 is installed, and the cylinder body of the membrane still, the upper head 9, and the orifice plate 8 are sealed and connected by flanges, and t...

Embodiment 2

[0041] Embodiment 2: Utilize the device for purifying high-grade dioxane in a dioxane aqueous solution described in Example 1 to carry out the method for purifying high-grade dioxane in a dioxane aqueous solution in this embodiment, this implementation In the example, the height of the membrane still 6 is 2000mm, the inner diameter is 600mm, and the wall thickness is 5mm. The cavity of the membrane still cylinder is divided into two parts: a cylindrical cylinder and a membrane still upper cover, and the upper and lower parts pass through the hole The plate 8 is separated, and the cylindrical cylinder is divided into a membrane distillation generation section and a steam buffer section; the membrane distillation generation section is mainly composed of membrane modules 7, and the membrane modules 7 are composed of 240 groups with an inner diameter of 0.8 mm, a wall thickness of 0.3 mm, and a pore diameter of 0.25 μm, porosity 0.5, length 1800mm of inorganic molecular sieve perva...

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Abstract

The invention discloses an apparatus and a method for purifying excellent-grade dioxane in a dioxane aqueous solution. The apparatus comprises a membrane distiller, two sets of rectification towers, a pressurizing pump feeding mixer, a pressurizing pump, a feeding pre-heater and a water vapor condenser. The method for purifying excellent-grade dioxane by using the apparatus comprises that a to-be-treated dioxane aqueous solution is rectified by the first rectification tower; the pre-concentrated dioxane-water material is extracted from the first rectification tower to the pressurizing pump feeding mixer, and is mixed with a circulating material so as to be extracted, the extracted material is pressurized by the pressurizing pump, the pressurized material is extracted to the feeding pre-heater, and is pre-heated, and the pre-heated material enters the membrane distiller; and the concentrated liquid extracted by the membrane distiller enter the second rectification tower, and is rectified, and the second rectification tower extracts the high-purity dioxane product through the second rectification tower reboiler. According to the present invention, the apparatus is introduced into the membrane distiller to carry out azeotropic separation, such that the method is the novel environmentally friendly water treatment technology.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a device and a method for purifying high-grade dioxane in an aqueous solution of dioxane. Background technique [0002] Polyester polyol is an important raw material for the synthesis of polyurethane. It plays the role of a flexible soft segment in the synthesis of polyurethane. Due to the unique molecular structure inside polyurethane, it has the characteristics of high strength, tear resistance and wear resistance. Based on these unique properties It has developed rapidly in recent years and has been widely used in many fields, such as aerospace, sports, railways, construction, daily life, industrial and agricultural production, medicine and many other aspects. It is precisely because of the large-scale expansion of polyurethane application fields that polyester polyols have a huge market space, considerable demand and significant research value. [000...

Claims

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Application Information

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IPC IPC(8): B01D3/14B01D61/36C07D319/02
CPCB01D3/143B01D61/364B01D61/366C07D319/02
Inventor 田强孙玉玉岳昌海
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD