Production process for preparing activated carbon with high iodine value by using petroleum coke

Abstract

The invention relates to a production process for preparing activated carbon with a high iodine value by using petroleum coke. The production process is characterized by comprising the following specific steps: S1, pretreating the petroleum coke; S2, mixing; S3, kneading and granulating; according to the method, the raw materials are cheap, and the cost is lower; and the catalyst also has the advantages of high specific surface area, high fixed carbon content and high desulfurization efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of activated carbon preparation, and in particular to a production process for preparing high iodine value activated carbon by utilizing petroleum coke. Background Art

[0002] Oil coke is a product obtained by separating the light and heavy oils through distillation of crude oil and then thermal cracking the heavy oil. The main element composition is carbon, accounting for more than 80wt%, and the rest is hydrogen, oxygen, nitrogen, sulfur and metal elements. It appears as irregular, metallic, black or dark gray porous solid particles with a developed pore structure.

[0003] Petroleum coke has low ash content and high carbon content. It is a rare raw material for preparing activated carbon. After carbonization and activation, high-performance activated carbon can be prepared. The process is simple and the cost is low. The existing preparation process can be summarized into four steps in essence: selection and pretreatment of raw materials; full mixing with activating agent, heating activation; cooling and drying; this process step has great limitations. It cannot prepare activated carbon with high iodine value, and the specific surface area and desulfurization efficiency cannot meet people's increasing needs. Therefore, in order to solve this problem, it is particularly important to design a production process for preparing high iodine value activated carbon using petroleum coke. Summary of the invention

[0004] In order to solve the above problems, the present invention designs a production process for preparing high iodine value activated carbon using petroleum coke. By adopting this method, not only the raw materials are cheap and the cost is lower; but also it has the advantages of high specific surface area, high fixed carbon content and high desulfurization efficiency.

[0005] In order to solve the above technical problems, the present invention provides a production process for preparing high iodine value activated carbon using petroleum coke, characterized in that the specific steps are as follows:

[0006] S1: Petroleum coke pretreatment: the raw petroleum coke is introduced into a pulverizer for preliminary crushing, and then the crushed petroleum coke is sent to a grinder for grinding;

[0007] S2: Mixing: The petroleum coke powder treated in step S1 is transported into a mixing tank, and then an activator and a binder are added and mixed thoroughly;

[0008] S3: Kneading and granulation: The petroleum coke powder mixed with the activator and the binder is sent to the kneading granulator for granulation to form preliminary activated carbon particles;

[0009] S4: Secondary activation: The initially formed activated carbon particles are sent into the activation box, and the temperature is first controlled at 450-500°C for the first activation, and then the temperature is controlled at 900-1000°C for the second activation;

[0010] S5: Cooling and water washing: The activated carbon particles after the secondary activation are sent to the water washing cylinder and fully washed by water flow. The material is quickly cooled during the washing process;

[0011] S6: Drying: The activated carbon particles after being fully washed with water in step S5 are sent to a drying oven for drying to obtain high iodine value activated carbon.

[0012] Further: the activator and adhesive in step S2 are KOH and phenolic resin respectively, and the addition ratio of the activator and the adhesive is 45-50 parts of the activator and 1-2 parts of the adhesive for every 10 parts by mass of the petroleum coke powder.

[0013] Furthermore: the petroleum coke powder in step S2 is transported through a pipeline system, and the pipeline system is composed of a feeding main pipeline, a diverter seat, a confluence seat, a diverter branch pipe and a coal powder feeding pipeline, the feeding main pipeline is connected to the top of the diverter seat and communicated with it, four diverter branch first joints are arranged from top to bottom on the side of the diverter seat facing the confluence seat, the coal powder feeding pipeline is connected to the bottom of the confluence seat and communicated with it, four diverter branch second joints are arranged from top to bottom on the side of the confluence seat facing the diverter seat, a diverter branch is connected between each of the four diverter branch first joints and the four diverter branch second joints, and the diverter branch first joints and the diverter branch second joints are both provided with switch valve assemblies.

[0014] Further: the second joints of the four branch pipes are telescopic joints, which are specifically composed of a guide cylinder and a connecting end body. One end of the guide cylinder is connected to the side wall of the conduit seat and is communicated with it. A connecting flange for connecting the branch pipe is provided on one end of the connecting end body. The other end of the connecting end body extends into the guide cylinder and can telescopically slide along the guide cylinder.

[0015] Furthermore: a pressure switch valve is also provided at the bottom of the diverter seat, and a pressure delivery pipeline is connected to the pressure switch valve. The pressure delivery pipeline is connected to the side wall of the lower end of the confluence seat and communicated with it.

[0016] Furthermore: the pressure switch valve includes a first valve body, a second valve body, a valve core and a spring. The second valve body is open at one end and sealed at the other end. The open end is connected to the bottom of the diverter seat and communicated with it. One end of the first valve body is fixed on the outer wall of the second valve body, and the other end of the first valve body is connected to the pressure delivery pipeline. The sealed end of the second valve body extends into the first valve body. There is a gap between the inner wall of the first valve body and the outer wall of the second valve body. The valve core is connected to the second valve body through a spring piston type. A pressure diversion channel is opened on the side wall of the second valve body in the first valve body, and the pressure diversion channel is sealed by the valve core.

[0017] Furthermore: when the activation box in step S4 is performing secondary activation, the interior of the activation box is filled with inert gas, and a spraying pipe is provided inside the activation box, and the spraying pipe is connected to the co-activator storage tank.

[0018] After adopting the above structure, the present invention not only has cheap raw materials and lower costs by adopting this method, but also has the advantages of high specific surface area, high fixed carbon content and high desulfurization efficiency. In addition, the present invention can produce high iodine value activated carbon by improving the ratio, so that it can reach 850mg / g. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 A schematic diagram of the piping system.

[0021] Figure 2 This is the internal structure diagram of the pressure protection valve. DETAILED DESCRIPTION

[0022] The present invention provides a production process for preparing high iodine value activated carbon using petroleum coke, and the specific steps are as follows:

[0023] S1: Petroleum coke pretreatment: the raw petroleum coke is introduced into a pulverizer for preliminary crushing, and then the crushed petroleum coke is sent to a grinder for grinding;

[0024] S2: Mixing: The petroleum coke powder treated in step S1 is transported into a mixing tank, and then an activator and a binder are added and mixed thoroughly;

[0025] S3: Kneading and granulation: The petroleum coke powder mixed with the activator and the binder is sent to the kneading granulator for granulation to form preliminary activated carbon particles;

[0026] S4: Secondary activation: The initially formed activated carbon particles are sent into the activation box, and the temperature is first controlled at 450-500°C for the first activation, and then the temperature is controlled at 900-1000°C for the second activation;

[0027] S5: Cooling and water washing: The activated carbon particles after the secondary activation are sent to the water washing cylinder and fully washed by water flow. The material is quickly cooled during the washing process;

[0028] S6: Drying: The activated carbon particles after being fully washed with water in step S5 are sent to a drying oven for drying to obtain high iodine value activated carbon.

[0029] The activator and adhesive in the above step S2 are KOH and phenolic resin respectively, and the addition ratio of the activator and the adhesive is 45-50 parts of the activator and 1-2 parts of the adhesive per 10 parts by mass of the petroleum coke powder.

[0030] like Figure 1 The petroleum coke powder in step S2 is transported through a pipeline system, and the pipeline system is composed of a feeding main pipeline 3, a diverter seat 1, a confluence seat 2, a diverter branch 5 and a coal powder feeding pipeline 4, wherein the feeding main pipeline is connected to the top of the diverter seat and communicated therewith, and the diverter seat is provided with four diverter branch first joints 6 from top to bottom on the side of the confluence seat facing the diverter seat, and the coal powder feeding pipeline is connected to the bottom of the confluence seat and communicated therewith, and the confluence seat is provided with four diverter branch second joints from top to bottom on the side of the diverter seat facing the diverter seat, and a diverter branch is connected between each of the four diverter branch first joints and the four diverter branch second joints, and a switch valve assembly is provided on the diverter branch first joint and the diverter branch second joint. The present invention can select one or more diverter branches to transport powder according to actual conditions, and the remaining diverter branches can be disassembled separately for cleaning and maintenance during the transportation process, which plays a role in increasing practical performance.

[0031] like Figure 1 The second joints of the four branch pipes are telescopic joints, which are specifically composed of a guide cylinder 7 and a connection end body 8. One end of the guide cylinder is connected to the side wall of the confluence seat and communicates with it. One end of the connection end body is provided with a connection flange for connecting the branch pipe. The other end of the connection end body extends into the guide cylinder and can be telescopically slid along the guide cylinder. The present invention adopts this structure to facilitate disassembly and assembly.

[0032] like Figure 1 A pressure switch valve 10 is also provided at the bottom of the diverter seat, and a pressure delivery pipeline 9 is connected to the pressure switch valve. The pressure delivery pipeline is connected to the side wall of the lower end of the confluence seat and communicated with it.

[0033] like Figure 2The pressure switch valve shown includes a first valve body 10-1, a second valve body 10-2, a valve core 10-4 and a spring 10-5. The second valve body is open at one end and sealed at the other end. The open end is connected to the bottom of the diverter seat and communicates with it. One end of the first valve body is fixed on the outer wall of the second valve body. The other end of the first valve body is connected to the pressure delivery pipeline. The sealed end of the second valve body extends into the first valve body. There is a gap between the inner wall of the first valve body and the outer wall of the second valve body. The valve core is connected to the second valve body through a spring piston. A pressure guide channel 10-3 is opened on the side wall of the second valve body in the first valve body. The pressure guide channel is sealed by the valve core. The present invention adopts this structure to play a self-protection function, prevent unnecessary structural damage caused by excessive internal and external pressure differences, and increase practical performance.

[0034] During the secondary activation, the activation box in the above step S4 is filled with inert gas. A spraying pipe is provided inside the activation box, and the spraying pipe is connected to the co-activator storage tank.

[0035] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A production process for preparing high iodine value activated carbon using petroleum coke, characterized in that: The specific steps are as follows: S1: Petroleum coke pretreatment: the raw petroleum coke is introduced into a pulverizer for preliminary crushing, and then the crushed petroleum coke is sent to a grinder for grinding; S2: Mixing: The petroleum coke powder treated in step S1 is transported into a mixing tank, and then an activator and a binder are added and mixed thoroughly; S3: Kneading and granulation: The petroleum coke powder mixed with the activator and the binder is sent to the kneading granulator for granulation to form preliminary activated carbon particles; S4: Secondary activation: The initially formed activated carbon particles are sent into the activation box, and the temperature is first controlled at 450-500°C for the first activation, and then the temperature is controlled at 900-1000°C for the second activation; S5: Cooling and water washing: The activated carbon particles after the secondary activation are sent to the water washing cylinder and fully washed by water flow. The material is quickly cooled during the washing process; S6: Drying: The activated carbon particles after being fully washed with water in step S5 are sent to a drying oven for drying to obtain high iodine value activated carbon.

2. A production process for preparing high iodine value activated carbon using petroleum coke according to claim 1, characterized in that: The activator and adhesive in step S2 are KOH and phenolic resin respectively, and the addition ratio of the activator and adhesive is 45-50 parts of the activator and 1-2 parts of the adhesive per 10 parts by mass of the petroleum coke powder.

3. The production process for preparing high iodine value activated carbon using petroleum coke according to claim 1, characterized in that: The petroleum coke powder in step S2 is transported through a pipeline system, wherein the pipeline system consists of a feeding main pipeline (3), a diverter seat (1), a confluence seat (2), a diverter branch pipe (5) and a coal powder feeding pipeline (4), wherein the feeding main pipeline is connected to the top of the diverter seat and communicated therewith, and four diverter branch pipe first joints (6) are arranged from top to bottom on the side of the diverter seat facing the confluence seat, and the coal powder feeding pipeline is connected to the bottom of the confluence seat and communicated therewith, and four diverter branch pipe second joints are arranged from top to bottom on the side of the confluence seat facing the diverter seat, and a diverter branch pipe is connected between each of the four diverter branch pipe first joints and the four diverter branch pipe second joints, and a switch valve assembly is arranged on the diverter branch pipe first joint and the diverter branch pipe second joint.

4. A production process for preparing high iodine value activated carbon using petroleum coke according to claim 3, characterized in that: The second joints of the four branch pipes are telescopic joints, which are specifically composed of a guide cylinder (7) and a connecting end body (8). One end of the guide cylinder is connected to the side wall of the conduit seat and is in communication therewith. A connecting flange for connecting the branch pipe is provided on one end of the connecting end body. The other end of the connecting end body extends into the guide cylinder and can telescopically slide along the guide cylinder.

5. The production process for preparing high iodine value activated carbon using petroleum coke according to claim 3, characterized in that: A pressure switch valve (10) is also provided at the bottom of the diverter seat, and a pressure delivery pipeline (9) is connected to the pressure switch valve. The pressure delivery pipeline is connected to the side wall of the lower end of the confluence seat and communicates with it.

6. A production process for preparing high iodine value activated carbon using petroleum coke according to claim 5, characterized in that: The pressure switch valve comprises a first valve body (10-1), a second valve body (10-2), a valve core (10-4) and a spring (10-5); the second valve body is open at one end and sealed at the other end, and the open end is connected to the bottom of the diverter seat and communicates with it; one end of the first valve body is sleeved and fixed on the outer wall of the second valve body, and the other end of the first valve body is connected to the pressure delivery pipeline; the sealed end of the second valve body extends into the first valve body, and a gap exists between the inner wall of the first valve body and the outer wall of the second valve body; the valve core is connected to the second valve body by a spring piston type; a pressure guide channel (10-3) is provided on the side wall of the second valve body in the first valve body, and the pressure guide channel is sealed by the valve core.

7. The production process for preparing high iodine value activated carbon using petroleum coke according to claim 1, characterized in that: When the activation box in step S4 is performing secondary activation, the interior of the activation box is filled with inert gas, and a spraying pipe is provided inside the activation box, and the spraying pipe is connected to the auxiliary activator storage tank.

Images