Superfine molecular sieves filtering separating and mother solution recovering method

Abstract

The invention relates to a method of filter separator of superfine molecular sieve and mother liquor recovery, comprising: firstly, the superfine molecular sieve seriflux is intensively mixed and pulp uniformly in the storage tank; the superfine molecular sieve seriflux is fed into the filter unit specially designed by the pump; the superfine molecular sieve seriflux is filtrated through the filter unit and then the filtrate flows into to the collecting tank; lastly, the seriflux concentrated flows back into the storage tank; the said filter unit accepts the superfine molecular sieve seriflux to do rapid turbulent motion in the channel with filter cloth where a layer of thin filter cake is formed, and liquid of the superfine molecular seriflux infiltrates out perpendicularly through the thin filter cake and the filter cloth to form perpendicular interlacing between the flow direction of superfine molecular sieve seriflux and that of the filtrate; the filtrate is connected as the mother liquor after flowing into the connecting tank. The method for filtrating using the cross-flow type thin filter cake, is capable of executing liquid-solid separation of superfine molecular sieve, especially for the high viscosity superfine molecular sieve, and recovery of the uperfine molecular sieve mother liquor is capable of reducing the cost of molecular sieve effectively, and abating the pollution to environment.

Description

technical field [0001] The invention relates to a method for ultrafine molecular sieve filtration separation and mother liquor recovery. Background technique [0002] Ultrafine molecular sieves refer to molecular sieves with particle sizes below 1 μm, especially fine-grained molecular sieves less than 0.5 μm. Compared with conventional large-grained molecular sieves, they have many advantages such as high activity and good selectivity. With the advancement of technology in oil refining, chemical industry and other industries, its production and application are becoming more and more extensive. A major problem facing the production of ultrafine molecular sieves is how to separate liquid and solid with high efficiency without affecting product performance. Generally speaking, the finer the molecular sieve, the more difficult it is to separate it, especially the nano-scale molecular sieve is suspended in the liquid, and the traditional gravity sedimentation is almost unusable;...

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Problems solved by technology

CN1261215C discloses a method for filtering nano-molecular sieves. The method adds an alkaline medium before filtering nano-molecular sieves so that the pH of the solution is greater than or equal to 12, thereby preventing uncrystallized SiO 2 Agglomeration; CN1195678C discloses a method for filtering water slurry of Y-type molecular sieve, adding alkali or a mixture of alkali and salt in the slurry during filtration, this method can significantly accelerate the filtration speed of cross-baking Y-type molecular sieve water slurry, but The above two additionally increased production costs, and did not propose how to specifically carry out the separation method of ultrafine molecular sieves

CN1191125C discloses a method for separating molecular sieve catalysts in a ketoamine oximation reaction system. The method adopts a common sedimentation method for separation, which has low efficiency and is difficult to implement in industry

For low viscosity molecular sieve slurry, such as ZSM? Molecular sieve slurry, MCM? 2 Molecular sieve slurry, etc., can be separated by traditional filter cloth filtration methods (such as plate and frame filter, belt filter, etc.) or inorganic membrane system; for high viscosity molecular sieve slurry (such as β molecular sieve, SAPO series molecular sieve, etc.) With the above filtration methods, it is difficult to separate the mother liquor due to clogging of the filter holes and other reasons.

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