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Process for improving chemical reaction conversion rate by utilizing FAU-type molecular sieve membrane

A technology of chemical reaction and molecular sieve, applied in chemical/physical/physicochemical processes, organic chemistry, bulk chemical production, etc., can solve the problems of complex operation, low efficiency, high energy consumption, etc., and achieve the effect of simple operation

Active Publication Date: 2010-02-24
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional industries adopt methods such as adsorption, rectification, and extraction to realize this process. The operation is complicated, the efficiency is low, the energy consumption is high, and a large amount of environmental pollutants will be produced.

Method used

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  • Process for improving chemical reaction conversion rate by utilizing FAU-type molecular sieve membrane
  • Process for improving chemical reaction conversion rate by utilizing FAU-type molecular sieve membrane
  • Process for improving chemical reaction conversion rate by utilizing FAU-type molecular sieve membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Separation performance of microwave-synthesized FAU type molecular sieve membrane

[0019] In-situ aging-microwave heating method (see Chinese patent CN1778677A for details on the synthesis method, published on May 31, 2006) in porous α-Al 2 o 3 The X-ray diffraction pattern of the FAU type molecular sieve membrane synthesized on the outer surface of the carrier tube (12mm in outer diameter, 9mm in inner diameter, and a porosity of about 30%) is as follows figure 1 As shown, there are only FAU type molecular sieves and carrier α-Al in the figure 2 o 3 Diffraction peaks of other impurity phases. Scanning electron micrograph of FAU type molecular sieve membrane ( figure 2 , image 3 ) shows that the surface of the carrier is covered with a continuous and dense molecular sieve membrane with a thickness of about 5 μm. Molecular sieve crystals are uniform in size and closely connected. Its silicon-aluminum ratio is about 1.5 as measured by an energy disper...

Embodiment 2

[0024] Embodiment 2: the reaction of dimethyl carbonate and n-butanol

[0025] Transesterification of dimethyl carbonate with n-butanol Figure 5 carried out in the experimental setup shown. After 0.1mol dimethyl carbonate and 0.4mol n-butanol are fully mixed in mixer 1, they are vaporized in vaporizer 3 through injection pump 2 at a flow rate of 1 mL / min. The mixed steam enters the 2 Catalyst fixed bed reactor 5 reacts under the conditions of 413K and 0.2MPa. After the reaction, the steam enters the FAU-type molecular sieve membrane (in-situ aging-microwave heating synthesis, the effective membrane area is 22cm 2 ) in the membrane module 6, the separation is realized under the conditions of 393K and 0.2MPa. The permeate side of the membrane module is evacuated by a vacuum pump and condensed with liquid nitrogen, and the raw material liquid is returned to the mixer through the condenser 7. After the reaction was carried out for 4 hours, the composition of the reaction sys...

Embodiment 3

[0026] Embodiment 3: the reaction of dimethyl carbonate and n-butanol

[0027] According to the same operation as in Example 2, except that the FAU type molecular sieve membrane in the membrane module is synthesized by a two-step in-situ hydrothermal method (the synthesis method is detailed in Chinese Patent CN101112676A, published on January 30, 2008), its silicon-aluminum ratio The energy dispersive X-ray fluorescence spectrometer was determined to be 1.2. After the reaction was carried out for 4 hours, the conversion rate of dimethyl carbonate was 81.5%, the selectivity of dibutyl carbonate was 82.8%, and the yield of dibutyl carbonate was 67.5%.

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Abstract

The invention provides a process for improving chemical reaction conversion rate by utilizing an FAU-type molecular sieve membrane. A reaction device comprises a membrane component provided with the FAU-type molecular sieve membrane; when reaction raw materials are subjected to catalytic reaction in a reactor or during the interstage of multistage reaction, the FAU-type molecular sieve membrane selectively removes reaction products methanol or / and ethanol out of the reaction system so as to promote the reaction to be equilibrated and move to the positive reaction direction, and improve the reaction conversion rate; and the process has simple and convenient operation and no pollution to the environment, and meets the requirement of green chemistry.

Description

technical field [0001] The invention relates to the application of molecular sieve membranes, and provides a process for improving the conversion rate of chemical reactions by utilizing the FAU type molecular sieve membranes. Background technique [0002] Zeolite molecular sieve membrane is a new type of inorganic membrane developed in the last two decades. It has the advantages of general inorganic membranes such as high mechanical strength, high temperature resistance, resistance to chemical erosion and biological erosion, and at the same time has the characteristics of zeolite molecular sieve: regular pore structure , with molecular sieving ability; large specific surface area, strong adsorption capacity; adjustable affinity / hydrophobicity, etc. Therefore, zeolite molecular sieve membranes have good separation performance, and gradually replace organic membranes in the fields of multiple membrane technologies (such as pervaporation, gas separation, membrane reaction, etc....

Claims

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Application Information

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IPC IPC(8): B01J19/00B01D53/22B01D71/02B01D63/00C07C29/76C07C31/04C07C31/08
CPCY02P20/52
Inventor 杨维慎朱广奇李砚硕刘杰周汉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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