Production method for preparing methanol and then preparing ethylene from high-purity carbon powder

Abstract

The invention discloses a production method for preparing methanol and then preparing ethylene from high-purity carbon powder, and relates to the technical field of ethylene production. The method comprises the following steps: S1, crushing high-purity carbon powder until the particle size is less than 0.1 mm, and controlling the water content to be 2% or below; and S2, adding a dispersing agent and an alkaline stabilizer in a mass ratio of 0.1-0.3% according to a mass ratio of the carbon powder to the water of 6: 4, and carrying out ball milling to form the coal water slurry with the viscosity of 1000-2000cP. According to the invention, the biomass-sourced high-purity carbon powder is adopted to replace the traditional calcium carbide or petroleum-based raw material, so that the environmental pollution in the production process is reduced from the source, the biomass belongs to a renewable resource, and compared with a non-renewable petroleum resource, the sustainable development of production can be better realized, and the problem of high pollution existing in the traditional mode is avoided; the dependence on traditional fossil energy is reduced, the utilization efficiency of the raw materials is improved through the coal water slurry preparation process, and the subsequent synthesis gas purification, methanol synthesis and ethylene preparation processes are stable and efficient.

Description

Technical Field

[0001] This invention relates to the field of ethylene production technology, specifically to a method for producing ethylene from methanol using high-purity carbon powder. Background Technology

[0002] Currently, the PVC industry mainly relies on two raw material routes: 1. Calcium carbide method: acetylene is produced by reacting calcium carbide with water, and then reacted with electrolytic chlorine to produce vinyl chloride, which is then polymerized to produce PVC; This process is highly polluting and energy-intensive, and is subject to national restrictions.

[0003] 2. Petroleum ethylene process: Ethylene is obtained by cracking petroleum, which is then reacted with chlorine to produce vinyl chloride, which is then polymerized to produce PVC; This method is costly, dependent on petroleum resources, and subject to significant fluctuations in raw material availability.

[0004] Therefore, there is an urgent need for a new method for ethylene production that is clean, efficient, and non-petroleum-based.

[0005] Therefore, a production method for methanol and then ethylene from high-purity carbon powder is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a method for producing ethylene from methanol using high-purity carbon powder, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention specifically adopts the following technical solution: A method for producing methanol and then ethylene from high-purity carbon powder includes the following steps: Step S1: Crush the high-purity carbon powder to a particle size of less than 0.1 mm and control the moisture content to below 2%; Step S2: Add 0.1% to 0.3% by mass of dispersant and alkaline stabilizer at a carbon powder to water mass ratio of 6:4, and then ball mill to form a coal-water slurry with a viscosity of 1000 to 2000 cP. Step S3: Gasify the coal-water slurry to generate syngas; Step S4: The syngas is purified and then used to synthesize methanol; Step S5: Methanol is reacted to produce ethylene using a methanol-to-olefins (MTO / MTP) process; Step S6: Separate and purify the ethylene to obtain polymer-grade ethylene product.

[0008] Furthermore, the high-purity carbon powder is obtained from biomass through pollution-free separation of cellulose, lignin, and hemicellulose, with a fixed carbon content greater than 99%.

[0009] Furthermore, the dispersant is a naphthalene sulfonate, and its dosage is 0.1% to 0.3%, and the stabilizer is sodium hydroxide, used to adjust the pH to 8 to 10.

[0010] Furthermore, the coal-water slurry gasification reaction is operated using an aerospace furnace or a gasifier, and the volume ratio of H2 / CO in the syngas is controlled at 2:1 to 2.5:1.

[0011] Furthermore, the biomass raw material is selected from crop straw, forestry residues or industrial wood pulp by-products, and is processed by a patented separation device and method to obtain high-purity carbon powder.

[0012] Furthermore, the preparation process of the high-purity carbon powder includes pretreatment, separation, and purification steps of biomass to ensure the purity and quality of the carbon powder.

[0013] Furthermore, in step S6, the separation and purification of ethylene can be carried out using existing distillation techniques.

[0014] The beneficial effects of this invention are as follows: By using high-purity biomass-derived carbon powder to replace traditional calcium carbide or petroleum-based raw materials, environmental pollution during the production process is reduced from the source. Biomass is a renewable resource, which, compared to non-renewable petroleum resources, can achieve more sustainable development in production and avoid the high pollution problems of traditional methods, thus reducing dependence on traditional fossil energy. The coal-water slurry preparation process improves the utilization efficiency of raw materials, and the subsequent syngas purification, methanol synthesis, and ethylene production processes are stable and efficient, reducing energy consumption and production losses and improving production efficiency. Attached Figure Description

[0015] Figure 1 This is a flowchart of the production method of methanol and ethylene from high-purity carbon powder according to the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0018] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0020] like Figure 1 As shown, a method for producing methanol and then ethylene from high-purity carbon powder includes at least the following steps: Step S1: Crush the high-purity carbon powder to a particle size of less than 0.1 mm and control the moisture content to below 2%; Specifically, the high-purity charcoal powder is obtained from biomass through pollution-free separation of cellulose, lignin, and hemicellulose, with a fixed carbon content greater than 99%; the biomass raw materials are selected from crop straw, forestry residues, or industrial wood pulp by-products, and are processed by patented separation devices and methods to obtain high-purity charcoal powder; the preparation process of the high-purity charcoal powder includes pretreatment, separation, and purification steps of biomass to ensure the purity and quality of the charcoal powder.

[0021] Step S2: Add 0.1% to 0.3% by mass of dispersant and alkaline stabilizer at a carbon powder to water mass ratio of 6:4, and then ball mill to form a coal-water slurry with a viscosity of 1000 to 2000 cP. Specifically, the dispersant is a naphthalene sulfonate, and its dosage is 0.1% to 0.3%, and the stabilizer is sodium hydroxide, used to adjust the pH to 8 to 10.

[0022] Step S3: Gasify the coal-water slurry to generate syngas; Specifically, the coal-water slurry gasification reaction is operated using an aerospace furnace or a gasifier, and the H2 / CO volume ratio in the syngas is controlled at 2:1 to 2.5:1.

[0023] Step S4: The syngas is purified and then used to synthesize methanol; Step S5: Methanol is reacted to produce ethylene using a methanol-to-olefins (MTO / MTP) process; Specifically, in the existing technology, converting methanol into ethylene through the methanol-to-olefins (MTO / MTP) process is a relatively mature technical route.

[0024] This process typically employs special catalysts, such as molecular sieve catalysts, to react methanol molecules under specific reaction conditions to produce low-carbon olefins such as ethylene and propylene. The reaction process requires precise control of parameters such as temperature, pressure, and catalyst activity to ensure the selectivity and yield of ethylene.

[0025] Step S6: Separate and purify the ethylene to obtain a polymer-grade ethylene product; Specifically, existing distillation techniques can be used to separate and purify ethylene.

[0026] Example: Raw materials: High-purity carbon powder obtained by biomass separation method, with fixed carbon content >99% and moisture content <2%.

[0027] Preparation of coal-water slurry: Mix carbon powder and water at a mass ratio of 6:4, add naphthalene sulfonate dispersant (0.1~0.3%), adjust the pH to 8~10 with NaOH, and grind into a uniform coal-water slurry using a ball mill, with the viscosity controlled at 1000~2000 cP.

[0028] Gasification: A Shell gasifier is used at a temperature of around 1300℃ to generate syngas.

[0029] After purification of the syngas, methanol is produced by a low-temperature catalytic process at a reaction temperature of 240℃ and a pressure of 7MPa.

[0030] The methanol-to-olefins (MTO / MTP) process uses SAPO-34 catalyst and reacts at a temperature of approximately 450°C to produce a mixture of olefin gases.

[0031] After separation and purification, ethylene products with a purity of over 99.9% are obtained.

[0032] In summary, by using high-purity biomass-derived carbon powder to replace traditional calcium carbide or petroleum-based raw materials, environmental pollution during the production process is reduced at its source. Biomass, as a renewable resource, is more conducive to sustainable production compared to non-renewable petroleum resources, and avoids the high pollution problems associated with traditional methods, thus reducing dependence on traditional fossil fuels. Furthermore, the coal-water slurry preparation process improves the utilization efficiency of raw materials, and subsequent processes such as syngas purification, methanol synthesis, and ethylene production are stable and efficient, reducing energy consumption and production losses, and improving production efficiency. The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A method for producing methanol and then ethylene from high-purity carbon powder, characterized in that, Includes the following steps: Step S1: Crush the high-purity carbon powder to a particle size of less than 0.1 mm and control the moisture content to below 2%; Step S2: Add 0.1% to 0.3% by mass of dispersant and alkaline stabilizer at a carbon powder to water mass ratio of 6:4, and then ball mill to form a coal-water slurry with a viscosity of 1000 to 2000 cP. Step S3: Gasify the coal-water slurry to generate syngas; Step S4: The syngas is purified and then used to synthesize methanol; Step S5: Methanol is reacted to produce ethylene using a methanol-to-olefins (MTO / MTP) process; Step S6: Separate and purify the ethylene to obtain polymer-grade ethylene product.

2. The method for producing methanol and then ethylene from high-purity carbon powder according to claim 1, characterized in that, The high-purity carbon powder is obtained from biomass through pollution-free separation of cellulose, lignin and hemicellulose, with a fixed carbon content greater than 99%.

3. The method for producing methanol and then ethylene from high-purity carbon powder according to claim 1, characterized in that, The dispersant is a naphthalene sulfonate, and its dosage is 0.1% to 0.3%. The stabilizer is sodium hydroxide, used to adjust the pH to 8 to 10.

4. The method for producing methanol and then ethylene from high-purity carbon powder according to claim 1, characterized in that, The coal-water slurry gasification reaction is operated using an aerospace furnace or a gasifier, and the H2 / CO volume ratio in the syngas is controlled at 2:1 to 2.5:

1.

5. The method for producing methanol and then ethylene from high-purity carbon powder according to claim 2, characterized in that, The biomass raw materials are selected from crop straw, forestry residues or industrial wood pulp by-products, and are processed by a patented separation device and method to obtain high-purity carbon powder.

6. The method for producing methanol and then ethylene from high-purity carbon powder according to claim 5, characterized in that, The preparation process of the high-purity charcoal powder includes pretreatment, separation, and purification steps of biomass to ensure the purity and quality of the charcoal powder.

7. The method for producing methanol and then ethylene from high-purity carbon powder according to claim 1, characterized in that, In step S6, the separation and purification of ethylene can be achieved using existing distillation techniques.

Images