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Method for separating methanol/methyl methacrylate mixed system

A methyl methacrylate, methanol technology, applied in the separation/purification of hydroxyl compounds, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of high energy consumption, complex process, etc. Continuous, less demanding effects

Active Publication Date: 2010-10-13
JIANGXI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the separation and recovery of methanol in the methanol / methyl methacrylate mixed system is still based on the traditional rectification method, which has the disadvantages of high energy consumption and complicated process.

Method used

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  • Method for separating methanol/methyl methacrylate mixed system
  • Method for separating methanol/methyl methacrylate mixed system
  • Method for separating methanol/methyl methacrylate mixed system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: the separation of methanol and methyl methacrylate mixed system methanol

[0036] The prepared Beta molecular sieve membrane was figure 1 The pervaporation device shown. The Beta molecular sieve membrane assembly is placed in a programmable oven 7, the inner cavity of the membrane tube is connected to a vacuum pump 10, and the inner side is evacuated. The mixed raw material solution 1 of methanol and methyl methacrylate is injected into the circulation pipeline through the electric metering pump 2, and after flowing through the preheater 3, the feed solution enters the membrane module 5 for osmotic separation. The permeated vapor (methanol vapor) enters the cold trap 9 driven by negative pressure, and is rapidly condensed and collected by liquid nitrogen. The liquid separated by the membrane module is cooled by the condenser 6 and then returned to the feed liquid tank.

Embodiment 2

[0038] Embodiment 2: Beta molecular sieve membrane preparation

[0039] The support body adopts the porous mullite tube made by Japan Nikkato Co., Ltd. as the substrate for membrane synthesis, and the composition of mullite is 67wt%Al 2 o 3 and 33wt% SiO 2 . The support was polished with 800-grit sandpaper, ultrasonically cleaned, and dried. On the one hand, soak the dried support in methanol solution containing 50% dimethyldiethoxysilane for 30 minutes to make the surface of the support positively charged; on the other hand, in 10% Beta molecular sieve seed crystal solution NaOH solution was added dropwise to adjust the pH value to 10, so that the surface of the seed crystal was negatively charged, and the positively charged support was placed in the negatively charged seed solution, and the seed crystal was evenly coated on the support by the action of charge On the outer surface of the beta, put it for 10 minutes, slowly lift it out of the solution, dry it, soak it repe...

Embodiment 3

[0045] Embodiment 3 (Beta molecular sieve membrane preparation)

[0046] The supporting body is made of tubular stainless steel produced by Mott Company of the United States. The support was polished with 800-grit sandpaper, ultrasonically cleaned, and dried. On the one hand, soak the dried support in methanol solution containing 30% dimethyldiethoxysilane for 30 minutes to make the surface of the support positively charged; on the other hand, in 10% Beta molecular sieve seed crystal solution NaOH solution was added dropwise to adjust the pH value to 10, so that the surface of the seed crystal was negatively charged, and the positively charged support was placed in the negatively charged seed solution, and the seed crystal was evenly coated on the support by the action of charge On the outer surface of the beta, put it for 20 minutes, slowly lift it out of the solution, dry it, soak it repeatedly 4 times, the thickness of the Beta seed layer is 0.5-3 μm, and dry it for later ...

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Abstract

The invention relates to a method for separating a methanol / methyl methacrylate mixed system, which is implemented by adopting a pervaporation process of a Beta molecular sieve membrane. In the method for preparing the Beta molecular sieve membrane for separating the methanol / methyl methacrylate mixed system, the dense and continuous Beta molecular sieve membrane is prepared by adopting a secondary growth method under the condition of high water-silicon ratio and the use of a cheap template agent. The Beta molecular sieve membrane prepared on tubular supporting bodies of various materials hasa good shape-selective separation effect and meets the requirement of separating the methanol from the methanol / methyl methacrylate mixed system. When the Beta molecular sieve membrane prepared underan optimized condition is used for performing pervaporation on the 60-DEG C methanol / methyl methacrylate (with mol percentage of 50:50) system, and the flux and the separation factors are more than 0.50 kg / m<2>*h and 650 respectively. The continuous Beta molecular sieve membrane with dense crystal is prepared through a series of test on synthesis steps of a seed crystal coating method, a formula of raw materials, a reaction condition and the like, so the method for separating the methanol / methyl methacrylate system is determined.

Description

technical field [0001] The invention provides a method applied to the separation of a methanol / methyl methacrylate mixed system, which belongs to the field of chemical separation and preparation of inorganic membrane materials. Background technique [0002] Separation is the main process of chemical production. Due to the limitation of chemical balance or the existence of side reactions, traditional production methods often cannot make effective use of raw materials. Moreover, the single-pass conversion rate, selectivity and yield are not ideal, and a separation and circulation system must be installed. This is also the main reason for the high energy consumption and large investment of chemical enterprises so far. As a new high-efficiency separation technology, membrane separation technology has been widely used in chemical industry, environmental protection, electronics, light industry, textile, petroleum, food, medicine, bioengineering, energy engineering and other fields...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/76B01D71/02B01D67/00B01D69/10
Inventor 陈祥树刘星生周荣飞董丽君胡娜
Owner JIANGXI NORMAL UNIVERSITY
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