Method for improving strength of strip-shaped molecular sieve

Abstract

The invention discloses a method for improving the strength of a strip-shaped molecular sieve, and relates to the field of strip-shaped molecular sieve production processes, the method comprises the following operation steps: S1, material preparation: selecting zeolite and a clay binder as main solid raw materials; s2, kneading: mixing the solid raw materials to obtain a mixed material mixture; in the strip extrusion process, the pore plate mold is changed, the pore plate mold with taper is used, compaction and forming of pug can be facilitated, the pores of the pore plate mold are larger than the target strip-shaped molecular sieve, the primarily-formed strip-shaped molecular sieve can be obtained after one-time strip extrusion, then the target mold is replaced, and therefore the production efficiency is greatly improved. Similarly, a cylindrical pore plate mold is changed into a tapered pore plate mold, and secondary strip extrusion is performed, so that the pug can be further compacted so as to obtain the strip-shaped molecular sieve with improved strength, the strength of the strip-shaped molecular sieve can be improved by more than one time compared with that of a traditional process, the use effect of the molecular sieve is remarkably improved, and the service life of the molecular sieve is remarkably prolonged.

Description

Technical Field

[0001] The invention relates to the field of strip molecular sieve production technology, in particular to a method for improving the strength of strip molecular sieve. Background Art

[0002] Strip molecular sieve refers to natural and artificial crystalline aluminosilicate with molecular sieve function. Its pore size is equivalent to the size of general molecules and can screen various fluid molecules. Strip molecular sieve has a uniform microporous structure. These holes can adsorb molecules smaller than its diameter into the cavity. It has a preferential adsorption capacity for polar molecules and unsaturated molecules. Therefore, it is widely used in the fields of deep drying, separation and purification of gases and liquids.

[0003] At present, the traditional molecular sieve extrusion process mainly includes the steps of mixing the molecular sieve material with other additives, kneading, extrusion molding, drying and calcining. In this process, the molecular sieve material and other additives are fully mixed and kneaded to form a plastic body, which is then extruded to obtain a wet molded body. However, during the molding process, due to the limitation of the mold, the strength of the molecular sieve is easily insufficient. Summary of the invention

[0004] The object of the present invention is to provide a method for improving the strength of strip molecular sieves to solve the technical problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: A method for improving the strength of a strip molecular sieve, comprising the following steps:

[0006] S1. Ingredients: zeolite and clay binder are selected as the main solid raw materials;

[0007] S2, kneading: mixing the above solid raw materials to obtain a mixed mixture, and kneading operation after adding water to obtain a uniform mud material;

[0008] S3, first extrusion: put the mud into the perforated plate mold, perform the first extrusion, compact the mud, and obtain the initially formed strip molecular sieve;

[0009] S4, secondary extrusion: replacing the strip-shaped molecular sieve after the first extrusion into the target mold, and performing secondary extrusion to further compact the clay material to obtain a strip-shaped molecular sieve with improved strength;

[0010] S5. Drying and activation: drying and activating the bar-shaped molecular sieve with improved strength to obtain the final bar-shaped molecular sieve product.

[0011] Preferably, the S1 contains 70-90 parts by weight of zeolite and 10-30 parts by weight of clay binder.

[0012] Preferably, the equipment required for kneading in S2 is a disc kneader, and the rotation speed of the disc kneader is 42 r / min.

[0013] Preferably, the amount of water added to the mixed material mixture in S2 is 25-50 parts by weight.

[0014] Preferably, the kneading time in the disc kneader in S2 is 30-60 minutes.

[0015] Preferably, the orifice plate mold in S3 is a tapered orifice plate mold, and the pore size of the orifice plate mold is slightly larger than the target strip-shaped molecular sieve.

[0016] Preferably, the pore size of the target mold in S4 is consistent with that of the target strip molecular sieve, and the target mold also adopts a tapered orifice plate design.

[0017] Preferably, the equipment used in the drying process in S5 is an oven, and the drying temperature is set to 500° C., and the holding time is set to 90 minutes.

[0018] Preferably, the activation treatment operation in S5 refers to drying the molecular sieve before use, that is, placing it in an oven and drying it at the above-mentioned temperature and time to ensure the activity and strength of the molecular sieve.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the extrusion process of the present invention, by changing the orifice plate mold, a tapered orifice plate mold is used, which is conducive to the compaction and molding of the mud material, and the holes of the orifice plate mold are larger than the target bar-shaped molecular sieve. After one extrusion, a preliminarily formed bar-shaped molecular sieve can be obtained, and then replaced with the target mold. The orifice plate mold is also changed from a cylindrical type to a tapered orifice plate mold, and a second extrusion is performed, so that the mud material can be further compacted, so as to obtain a bar-shaped molecular sieve with improved strength. The strength of the bar-shaped molecular sieve can be increased by more than 1 times compared with the traditional process, which significantly improves the use effect of the molecular sieve and extends the service life of the molecular sieve.

[0021] 2. The present invention selects zeolite and clay binder as the main solid raw materials, and after adding a proper amount of water, the mixed solid raw materials are evenly kneaded, so as to provide a good foundation for the subsequent molding steps, thereby helping to improve the strength of the strip molecular sieve.

[0022] 3. The present invention ensures the activity and strength of the strip molecular sieve through strict drying and activation treatment, improves the use effect of the molecular sieve, and prolongs the service life of the molecular sieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1The present invention is a flow chart of the method for improving the strength of bar-shaped molecular sieves. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 The present invention provides a technical solution: a method for improving the strength of a strip molecular sieve, comprising the following steps:

[0026] S1. Ingredients: zeolite and clay binder are selected as the main solid raw materials, and zeolite is 70-90 parts by weight and clay binder is 10-30 parts by weight;

[0027] S2, kneading: the solid raw materials are mixed to obtain a mixed mixture, and water is added to perform kneading operation to obtain a uniform mud material, so as to provide a good foundation for the subsequent molding step, thereby helping to improve the strength of the strip molecular sieve, wherein the kneading equipment required is a disc kneader, and the rotation speed of the disc kneader is 42r / min, the water added to the mixed mixture is 25-50 parts by weight, and the kneading time in the disc kneader is 30-60 minutes;

[0028] S3, first extrusion: put the mud into the orifice plate mold, perform the first extrusion, compact the mud, and obtain the initially formed strip molecular sieve, and the orifice plate mold is selected with a taper orifice plate mold, and the aperture of the orifice plate mold is slightly larger than the target strip molecular sieve. By using the orifice plate mold with a taper, it is beneficial to the compaction and molding of the mud, and the strength of the strip molecular sieve is further improved;

[0029] S4, secondary extrusion: the strip molecular sieve after the first extrusion is replaced into the target mold for secondary extrusion to further compact the mud material to obtain a strip molecular sieve with improved strength. The aperture of the target mold is consistent with the target strip molecular sieve, and the target mold also adopts a tapered orifice plate design. The secondary extrusion process significantly improves the strength of the strip molecular sieve, which can be increased by more than 1 times compared with the traditional process.

[0030] S5. Drying and activation: The strength-enhanced bar molecular sieve is dried and activated to obtain the final bar molecular sieve product. The equipment used in the drying process is an oven, and the drying temperature is set to 500°C, and the insulation time is set to 90 minutes. The activation treatment operation refers to drying the molecular sieve before use, that is, placing it in an oven and drying it according to the above-mentioned temperature and time. Through strict drying and activation treatment, the activity and strength of the bar molecular sieve are guaranteed, the use effect of the molecular sieve is improved, and the service life of the molecular sieve is extended.

[0031] In the extrusion process, a tapered orifice plate mold is used, which is conducive to the compaction and molding of the mud material, and the holes of the orifice plate mold are larger than the target strip molecular sieve. After one extrusion, a preliminarily formed strip molecular sieve can be obtained, and then replaced with the target mold. The orifice plate mold is also changed from a cylindrical type to a tapered orifice plate mold, and a second extrusion is performed, so that the mud material can be further compacted to obtain a strip molecular sieve with improved strength. The strength of the strip molecular sieve can be increased by more than 1 times compared with the traditional process, which significantly improves the use effect of the molecular sieve and extends the service life of the molecular sieve; by selecting zeolite and clay binder as the main solid raw materials, and adding an appropriate amount of water to evenly knead the mixed solid raw materials, it can provide a good foundation for the subsequent molding steps, thereby helping to improve the strength of the strip molecular sieve; through strict drying and activation treatment, the activity and strength of the strip molecular sieve are guaranteed, the use effect of the molecular sieve is improved, and the service life of the molecular sieve is extended.

[0032] Working principle: When using the method for improving the strength of the strip molecular sieve, 70-90 parts by weight of zeolite and 10-30 parts by weight of clay binder are selected as the main solid raw materials, and the solid raw materials are mixed in a disc kneader to obtain a mixed mixture. Subsequently, 25-50 parts by weight of water are added to the mixed mixture, and the mixture is kneaded in the disc kneader for 30-60 minutes until a uniform kneaded mixture is obtained. At this time, the kneaded mud material is placed in a tapered perforated plate mold and extruded for the first time to obtain a preliminarily formed strip molecular sieve. After that, the strip molecular sieve after the first extrusion is replaced in the target mold. The aperture of the target mold is the same as that of the target strip. The molecular sieve is consistent, and the same tapered orifice design is adopted, and a secondary extrusion is performed to further compact the mud material to obtain a strip molecular sieve with improved strength. The strip molecular sieve after the secondary extrusion is then dried and activated to obtain the final strip molecular sieve product. During the drying operation, the strip molecular sieve is placed in a drying container and then placed in an oven for drying. The drying temperature is set to 500°C and the insulation time is 90 minutes. The activation operation is to dry the strip molecular sieve before use to ensure the activity and strength of the strip molecular sieve. The content not described in detail in this description belongs to the prior art known to professional and technical personnel in this field.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for improving the strength of a strip molecular sieve, characterized in that: The steps are as follows: S1. Ingredients: zeolite and clay binder are selected as the main solid raw materials; S2, kneading: mixing the above solid raw materials to obtain a mixed mixture, and kneading operation after adding water to obtain a uniform mud material; S3, first extrusion: put the mud into the perforated plate mold, perform the first extrusion, compact the mud, and obtain the initially formed strip molecular sieve; S4, secondary extrusion: replacing the strip-shaped molecular sieve after the first extrusion into the target mold, and performing secondary extrusion to further compact the clay material to obtain a strip-shaped molecular sieve with improved strength; S5. Drying and activation: drying and activating the bar-shaped molecular sieve with improved strength to obtain the final bar-shaped molecular sieve product.

2. A method for improving the strength of a strip molecular sieve according to claim 1, characterized in that: The S1 contains 70-90 parts by weight of zeolite and 10-30 parts by weight of clay binder.

3. A method for improving the strength of a strip molecular sieve according to claim 1, characterized in that: The equipment required for kneading in S2 is a disc kneader, and the rotation speed of the disc kneader is 42 r / min.

4. A method for improving the strength of a strip molecular sieve according to claim 3, characterized in that: The amount of water added to the mixed material mixture in S2 is 25-50 parts by weight.

5. A method for improving the strength of a strip molecular sieve according to claim 3, characterized in that: The kneading time in the disc kneader in S2 is 30-60 minutes.

6. A method for improving the strength of a strip molecular sieve according to claim 1, characterized in that: The orifice plate mold in S3 is a tapered orifice plate mold, and the pore size of the orifice plate mold is slightly larger than the target strip-shaped molecular sieve.

7. A method for improving the strength of a strip molecular sieve according to claim 6, characterized in that: The pore size of the target mold in S4 is consistent with that of the target strip molecular sieve, and the target mold also adopts a tapered orifice plate design.

8. A method for improving the strength of a strip molecular sieve according to claim 1, characterized in that: The equipment used in the drying process in S5 is an oven, and the drying temperature is set to 500° C., and the holding time is set to 90 minutes.

9. A method for improving the strength of a strip molecular sieve according to claim 8, characterized in that: The activation treatment operation in S5 refers to drying the molecular sieve before use, that is, placing it in an oven and drying it at the above temperature and time to ensure the activity and strength of the molecular sieve.

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