Synthesis device for economic molecular sieve membrane

Abstract

The invention relates to a synthesis device for an economic molecular sieve membrane. The prior art is improved for circulating a membrane casting solution in a crystallization process to the outsideof a synthesis kettle, and a reasonable valve is arranged for controlling the volume of the membrane casting solution which enters a sedimentation kettle and the membrane casting solution of the corresponding time quantum, so that the sedimentation effect is the best on the basis of guaranteeing the crystallization effect.

Description

technical field [0001] The invention relates to a membrane synthesis device, in particular to a Silicalite-1 molecular sieve membrane synthesis device. Background technique [0002] Membrane separation technology is a new separation technology that emerged rapidly after the 1960s. It has the functions of separation, concentration, purification and refinement, as well as high efficiency, energy saving, environmental protection, molecular level filtration and simple filtration process, easy to control, etc. Features, which have been widely used in many fields at present, have produced huge economic and social benefits, and have become one of the most important means in today's separation science. As a kind of inorganic membrane, molecular sieve membrane has better thermal and chemical stability than organic membrane, and has great application potential in the fields of organic solvent / water separation and gas separation, while Silicalite-1 molecular sieve membrane is relativel...

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Problems solved by technology

[0003] However, in the process of preparing the all-silicon molecular sieve membrane, besides the crystallization of the molecular sieve membrane near the carrier, other positions in the casting solution also generate molecular sieves for the crystallization process, and the molecular sieves are deposited at the bottom of the reactor, and the deposited all-silicon molecular sieve is difficult Cleaning with ordinary inorganic acids, such as sulfuric acid, nitric acid and hydrofluoric acid, etc., which affects the reuse of the reactor, and the molecular sieve produced is also wasted

In the prior art, someone has used the process of crystallizing the seeded carrier to form a film and seeding the blank chip carrier in the same reactor, which avoids the damage of the reactor and the waste of molecular sieves. , but in the process of actual operation, it is found that there are many problems in this method, the most important of which is the mismatch of time

Generally, it takes at least 6 hours to crystallize the molecular sieve membrane by the secondary crystallization method, but it only takes a few seconds for general seed crystal coating such as ordinary dip coating and spin coating, even if the concentration of molecular sieve particles in the casting solution in the above method It requires a longer time than the ordinary coating process, but there is still a large difference in the time of the two processes, so when the crystallization effect of the film is guaranteed, the thickness of the molecular sieve particles deposited on the carrier to be crystallized is too thick Affect the crystallization, and when the crystallization of the molecular sieve membrane during the seeding process is guaranteed, it is seriously insufficient

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