A zinc oxide desulfurizer and its preparation method

Abstract

The present invention relates to the field of desulfurizers, and discloses a zinc oxide desulfurizer and a preparation method thereof, wherein the zinc oxide desulfurizer comprises the following raw material components: zinc oxide, magnesium oxide, copper oxide, clay, polyacrylamide, sodium hydroxide, and water; the preparation method comprises: (1) uniformly mixing zinc oxide, magnesium oxide, copper oxide, and clay according to weight parts to obtain a blended powder; (2) adding polyacrylamide and sodium hydroxide into water according to weight parts, and mixing them uniformly to obtain a blended aqueous solution; (3) adding the blended powder in step (1) into a ball rolling machine, starting the ball rolling machine, and spraying the blended aqueous solution in step (2) onto the surface of the blended powder in the ball rolling machine in a spraying manner, and rolling the blended powder into balls; (4) high-temperature drying is performed after rolling the balls to obtain the zinc oxide desulfurizer; the desulfurizer of the scheme has good desulfurization effect, simple production process, short cycle and low cost.

Description

Technical Field

[0001] The present invention relates to the field of desulfurizers, and in particular to a zinc oxide desulfurizer and a preparation method thereof. Background Art

[0002] Zinc oxide desulfurizer has high desulfurization accuracy, easy use, stable and reliable performance, high sulfur capacity and occupies an important position. It is widely used in synthetic ammonia, hydrogen production, synthetic methanol, coal chemical industry, petroleum refining, beverage production and other industries to remove hydrogen sulfide and certain organic sulfur in raw materials such as natural gas, petroleum fractions, oilfield gas, refinery gas, synthesis gas (H2+CO), carbon dioxide, etc. Zinc oxide desulfurizer can remove sulfur in raw gas (oil) to below 0.5~0.1μg / g, thereby ensuring the steam conversion and low Nickel, copper, iron and precious metal catalysts such as conversion, methanation, methanol, mortgaged alcohol and carbonyl synthesis are protected from sulfur poisoning; in the existing technology, zinc oxide desulfurizer is mainly prepared by the extrusion method, which requires high-temperature roasting in a kiln (above 600 degrees), has high energy consumption (energy consumption per ton is about 600 kWh), complex production process and long cycle, etc. At the same time, there are also defects such as easy powder loss and poor desulfurization effect. Therefore, there is an urgent need to design a zinc oxide desulfurizer and its preparation method with good desulfurization effect, simple production process, short cycle and low cost. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a zinc oxide desulfurizer with good desulfurization effect, simple production process, short cycle and low cost, and a preparation method thereof.

[0004] In order to solve the above problems, the present invention provides the following technical solutions:

[0005] A zinc oxide desulfurizer comprises the following raw material components: zinc oxide, magnesium oxide, copper oxide, clay, polyacrylamide, sodium hydroxide and water.

[0006] Preferably, the technical solution of the present invention also includes a zinc oxide desulfurizer, which includes the following raw material components in parts by weight: 90-95 parts of zinc oxide, 2-3 parts of magnesium oxide, 2-3 parts of copper oxide, 4-10 parts of clay, 0.1-1 part of polyacrylamide, 10-20 parts of sodium hydroxide, and 80-90 parts of water.

[0007] Furthermore, the technical solution of the present invention also includes that the fineness of the zinc oxide is 800-1200 mesh, the molecular weight of the polyacrylamide is 18 million, and the degree of hydrolysis is 35.

[0008] The second purpose of this application is to provide a method for preparing the above-mentioned zinc oxide desulfurizer, comprising the following steps:

[0009] (1) Mixing zinc oxide, magnesium oxide, copper oxide and clay uniformly according to weight to obtain a blended powder;

[0010] (2) Add polyacrylamide and sodium hydroxide to water according to weight proportions, mix well, and obtain a blended aqueous solution;

[0011] (3) adding the blended powder in step (1) into a ball rolling machine, starting the ball rolling machine, and spraying the blended aqueous solution in step (2) onto the surface of the blended powder in the ball rolling machine by spraying, and rolling the blended powder into balls;

[0012] (4) After rolling into balls, high-temperature drying is performed to obtain zinc oxide desulfurizer.

[0013] Preferably, the technical solution of the present invention further comprises, in step (4), rolling into balls and then polishing with a roller, leaving them to cool, and then performing a high-temperature drying process.

[0014] The technical solution of the present invention also includes that in step (3), the rolling time of the ball rolling machine is 30-180 minutes.

[0015] Furthermore, the technical solution of the present invention also includes that in step (3), the spraying speed of the blended aqueous solution is 30-100 kg / hour.

[0016] The technical solution of the present invention also includes that the drum polishing time is 20-60 minutes and the cooling time is 12-24 hours.

[0017] The technical solution of the present invention also includes that the drying temperature of the high-temperature drying is 120-200° C. and the drying time is 10-30 minutes.

[0018] The zinc oxide desulfurizer prepared by the raw material components and preparation method of the present application has a sulfur capacity greater than or equal to 35% at above 350° C. and a strength greater than 55 N / cm.

[0019] Beneficial effects of the present invention

[0020] Compared with the prior art, the purpose of the present invention is to provide a zinc oxide desulfurizer and its preparation method with good desulfurization effect, simple production process, short cycle and low cost. To achieve the above technical effects, first, the present application adopts the rolling ball method to prepare the desulfurizer, and the drying temperature is low, thereby effectively reducing energy consumption and production costs. At the same time, the production process is simple and the cycle is short. Secondly, the present application adopts polyacrylamide and sodium hydroxide to prepare a blended aqueous solution and formulate a forming binder, so that the desulfurizer has higher strength and helps to improve the uniformity of sodium hydroxide, thereby improving the desulfurization effect. Finally, the present application also adopts a drum polishing process, which can effectively improve the smoothness of the zinc oxide desulfurizer surface, prevent powder from falling during use, and effectively improve the desulfurization effect and service life of the desulfurizer. The zinc oxide desulfurizer prepared using the raw material components and preparation method of the present application has a sulfur capacity greater than or equal to 35% at above 350°C, a strength greater than 55N / cm, and an energy consumption per ton of less than 300 kWh. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attachment Figure 1 This is the SEM image of the zinc oxide desulfurizer of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention. Example 1

[0023] The raw material components and preparation method of zinc oxide desulfurization in this embodiment are as follows:

[0024] (1) 90 parts of zinc oxide, 3 parts of magnesium oxide, 2 parts of copper oxide, and 10 parts of clay were mixed uniformly by weight to obtain a blended powder; wherein the fineness of the zinc oxide was 1000 mesh;

[0025] (2) 0.1 parts of polyacrylamide, 10 parts of sodium hydroxide, and 80 parts of water were mixed uniformly by weight to obtain a blended aqueous solution; wherein the molecular weight of the polyacrylamide was 18 million and the degree of hydrolysis was 35;

[0026] (3) Add the blended powder in step (1) into a ball rolling machine, start the ball rolling machine, and roll the ball for 30 minutes. Spray the blended aqueous solution in step (2) onto the surface of the blended powder in the ball rolling machine at a spraying speed of 100 kg / hour, and roll the powder into balls.

[0027] (4) After rolling into balls, the mixture was polished by roller for 20 minutes, left to cool for 12 hours, and then dried at high temperature at 200°C for 10 minutes to obtain zinc oxide desulfurizer.

[0028] The prepared zinc oxide desulfurizer has a sulfur capacity greater than or equal to 37% at a temperature above 350° C., a strength of 58 N / cm, an energy consumption per ton of less than 284 kWh, and does not drop powder. Example 2

[0029] The raw material components and preparation method of zinc oxide desulfurization in this embodiment are as follows:

[0030] (1) 95 parts of zinc oxide, 3 parts of magnesium oxide, 2 parts of copper oxide, and 7 parts of clay were mixed uniformly by weight to obtain a blended powder; wherein the fineness of the zinc oxide was 1000 mesh;

[0031] (2) 0.5 parts of polyacrylamide, 15 parts of sodium hydroxide, and 85 parts of water were mixed uniformly by weight to obtain a blended aqueous solution; wherein the molecular weight of the polyacrylamide was 18 million and the degree of hydrolysis was 35;

[0032] (3) Add the blended powder in step (1) into a ball rolling machine, start the ball rolling machine, and roll the ball for 60 minutes. Spray the blended aqueous solution in step (2) onto the surface of the blended powder in the ball rolling machine at a spraying speed of 50 kg / hour, and roll into balls;

[0033] (4) After rolling into balls, the mixture was polished by roller for 40 minutes, left to cool for 18 hours, and then dried at high temperature at 150°C for 20 minutes to obtain zinc oxide desulfurizer.

[0034] The prepared zinc oxide desulfurizer has a sulfur capacity greater than or equal to 40% at a temperature above 350° C., a strength of 61 N / cm, an energy consumption per ton of less than 275 kWh, and does not drop powder. Example 3

[0035] The raw material components and preparation method of zinc oxide desulfurization in this embodiment are as follows:

[0036] (1) 93 parts of zinc oxide, 2.5 parts of magnesium oxide, 2.5 parts of copper oxide, and 5 parts of clay were mixed uniformly by weight to obtain a blended powder; wherein the fineness of the zinc oxide was 1000 mesh;

[0037] (2) 1 part of polyacrylamide, 20 parts of sodium hydroxide, and 80 parts of water were mixed uniformly by weight to obtain a blended aqueous solution; wherein the molecular weight of the polyacrylamide was 18 million and the degree of hydrolysis was 35;

[0038] (3) Add the blended powder in step (1) into a ball rolling machine, start the ball rolling machine, and roll the ball for 180 minutes. Spray the blended aqueous solution in step (2) onto the surface of the blended powder in the ball rolling machine at a spraying speed of 30 kg / hour, and roll the mixture into balls.

[0039] (4) After rolling into balls, the mixture was polished by roller for 60 minutes, left to cool for 24 hours, and then dried at high temperature at 120°C for 30 minutes to obtain zinc oxide desulfurizer.

[0040] The prepared zinc oxide desulfurizer has a sulfur capacity greater than or equal to 39% at a temperature above 350° C., a strength of 63 N / cm, an energy consumption per ton of less than 263 kWh, and does not drop powder.

[0041] Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any changes or substitutions that can be easily conceived by persons skilled in the art within the technical scope disclosed in the present invention shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A zinc oxide desulfurizer, characterized in that: The method comprises the following raw material components: zinc oxide, magnesium oxide, copper oxide, clay, polyacrylamide, sodium hydroxide and water; The preparation method of the zinc oxide desulfurizer comprises the following steps: (1) Mixing zinc oxide, magnesium oxide, copper oxide and clay uniformly according to weight to obtain a blended powder; (2) Add polyacrylamide and sodium hydroxide to water according to weight proportions, mix well, and obtain a blended aqueous solution; (3) adding the blended powder in step (1) into a ball rolling machine, starting the ball rolling machine, and spraying the blended aqueous solution in step (2) onto the surface of the blended powder in the ball rolling machine by spraying, and rolling the blended powder into balls; (4) After rolling into balls, high-temperature drying is performed to obtain zinc oxide desulfurizer.

2. The zinc oxide desulfurizer according to claim 1, wherein The invention comprises the following raw material components in parts by weight: 90-95 parts of zinc oxide, 2-3 parts of magnesium oxide, 2-3 parts of copper oxide, 4-10 parts of clay, 0.1-1 part of polyacrylamide, 10-20 parts of sodium hydroxide and 80-90 parts of water.

3. The zinc oxide desulfurizer according to claim 2, wherein: The fineness of the zinc oxide is 800-1200 meshes, the molecular weight of the polyacrylamide is 18 million, and the degree of hydrolysis is 35.

4. The zinc oxide desulfurizer according to claim 1, wherein: In step (4), the balls are rolled and polished by rollers, left to cool, and then subjected to a high-temperature drying process.

5. The zinc oxide desulfurizer according to claim 1, wherein: In step (3), the rolling time of the ball rolling machine is 30-180 minutes.

6. The zinc oxide desulfurizer according to claim 5, wherein: In step (3), the spraying rate of the blended aqueous solution is 30-100 kg / hour.

7. The zinc oxide desulfurizer according to claim 4, wherein: The drum polishing time is 20-60 minutes, and the cooling time is 12-24 hours.

8. The zinc oxide desulfurizer according to claim 1, wherein: The drying temperature of high temperature drying is 120-200°C and the drying time is 10-30 minutes.

9. The zinc oxide desulfurizer according to claim 1, wherein: The prepared zinc oxide desulfurizer has a sulfur capacity greater than or equal to 35% at a temperature above 350° C. and a strength greater than 55 N / cm.

Images