A biochar-based high-barrier odor suppressant and its preparation method and device

Abstract

The application discloses a kind of biochar-based high-barrier odor inhibitor and its preparation method and device.Preparation method includes (1) after biomass raw material is pulverized, pyrolysis carbonization reaction is carried out in medium-high temperature environment, and biochar is formed, and after ball milling, biochar material is prepared;(2) after biomass raw material is pulverized, carry out saccharification reaction with lye, form saccharification matrix liquid, after stirring and compounding stabilizer, thickener and surfactant, form foam matrix liquid;(3) after clay mineral is ball milled, carry out layer-expanding modification impregnation in impregnation equipment, and after drying and pulverizing, form clay mineral particles;(4) in high-viscosity mixing and stirring equipment, biochar material, foam matrix liquid and clay mineral particles are mixed and stirred, and biochar-based high-barrier odor inhibitor is prepared.The application solves the problems of lack of domestic odor inhibitor preparation technology and batch production of biochar-based high-barrier odor inhibitor, and the prepared biochar-based high-barrier odor inhibitor has excellent performance.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of biochar-based high-barrier odor inhibitor and its preparation method and device, belong to the field of odor inhibitor material. BACKGROUND

[0002] In recent years, with the rapid development of city and the needs of industrial upgrading, a large number of enterprises begin to relocate. The site pollution problem left by various industries is very serious, and the odor problem is very prominent, among which the odor nuisance problem of pesticide industry site is particularly prominent.

[0003] Odor substances are mainly composed of benzene series, halogenated hydrocarbons, aldehydes, ketones, acids, esters, sulfur-containing organic matter, nitrogen-containing organic matter and other volatile chemicals. Such odor substances are easy to release and diffuse into the atmosphere, causing odor nuisance problems. Domestic odor control materials have short time efficiency and poor stability, and there is still a lack of stable and feasible technology and materials. Therefore, it is necessary to develop high-barrier odor control materials and their continuous preparation method and device to meet the domestic site odor control needs. SUMMARY

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present application is to provide a kind of biochar-based high-barrier odor inhibitor and its preparation method and device, which can realize pyrolysis, saccharification, blending, impregnation, mixing and other steps in the preparation process of high-barrier odor inhibitor material on a continuous production line, solve the problems of lack of existing materials and lack of production process, and the prepared biochar-based high-barrier odor inhibitor has excellent performance.

[0005] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0006] The present application provides a preparation method of a biochar-based high-barrier odor inhibitor, comprising the following steps:

[0007] (1) After the biomass raw material is crushed, it is subjected to pyrolysis carbonization reaction in a medium-high temperature environment to form biochar, and then the biochar material is prepared after ball milling;

[0008] (2) After the biomass raw material is crushed, it is subjected to saccharification reaction with alkali liquor to form a saccharification matrix liquid, and after stirring and compounding stabilizer, thickening agent and surfactant, a foam matrix liquid is formed;

[0009] (3) After ball milling, the clay mineral is subjected to layer-expanding modification impregnation in an impregnation equipment, and then dried and crushed to form clay mineral particles;

[0010] (4) In a high-viscosity mixing and stirring equipment, the biochar material obtained in step (1), the foam matrix liquid obtained in step (2) and the clay mineral particles obtained in step (3) are mixed and stirred to prepare a biochar-based high-barrier odor inhibitor.

[0011] Preferably, the steps are connected by linkage to form a continuous production line.

[0012] Preferably, in step (1), the biomass raw material is one of chaff, straw, or a combination thereof.

[0013] Preferably, in step (1), the biomass raw material is crushed to a particle size of 0.01-1mm.

[0014] Preferably, in step (1), the pyrolysis and carbonization reaction is divided into two stages, the first stage being a high-temperature vacuum pyrolysis stage, and the second stage being a medium-temperature steam modification stage; further preferably, the temperature of the high-temperature vacuum pyrolysis stage is 200-600℃, and the time is 1-4h, and the temperature of the medium-temperature steam modification stage is 50-200℃, and the time is 0-1h.

[0015] Preferably, in step (1), the ball-milling particle size of the biochar is 5-100μm.

[0016] Preferably, in step (2), the biomass raw material is one of chaff, straw, or a combination thereof.

[0017] Preferably, in step (2), the biomass raw material is crushed to a particle size of 0.01-1mm.

[0018] Preferably, in step (2), the saccharification reaction is carried out at a temperature of 20-100℃ for 1-24h.

[0019] Preferably, in step (2), the viscosity of the saccharification base liquid is 600-1000CP.

[0020] Preferably, in step (2), the stirring time is 1-12h, and the stirring rate is 30-500r / min.

[0021] Preferably, in step (3), the ball-milling particle size of the clay mineral is 5-100μm.

[0022] Preferably, in step (3), the impregnation liquid for the impregnation process is a surfactant, and the mass ratio of the impregnation liquid to the clay mineral is 50-100:1.

[0023] Preferably, in step (3), the temperature of the impregnation process is 20-40℃, and the time is 1-24h.

[0024] Preferably, in step (3), the clay mineral after impregnation and drying is crushed to a particle size of 5-100μm.

[0025] Preferably, in step (4), the high-viscosity mixing and stirring is carried out in a vacuum environment.

[0026] Preferably, in step (4), the temperature of the high-viscosity mixing and stirring is 10-100 DEG C, the time is 1-24h, and the rate is 2000-3000r / min.

[0027] The application further provides a biochar-based high-barrier odor inhibitor prepared by the preparation method.

[0028] The application further provides a preparation device for a biochar-based high-barrier odor inhibitor, comprising:

[0029] The biomass raw material crushing device, the two-stage medium-high temperature pyrolysis device, the biochar ball milling device and the high-viscosity mixing and stirring device are connected in sequence through pipelines; meanwhile, the biomass raw material crushing device is further connected to the biomass saccharification device and the foam matrix liquid blending device through pipelines to the high-viscosity mixing and stirring device; meanwhile, the device further comprises a clay mineral ball milling device, which is connected to the impregnation device and the drying and crushing device through pipelines to the high-viscosity mixing and stirring device.

[0030] Preferably, the devices of the preparation device are connected in sequence through linkage to form a continuous production line.

[0031] Preferably, the first stage of the two-stage medium-high temperature pyrolysis device is a high-temperature vacuum pyrolysis stage, and the second stage is a medium-temperature steam modification stage.

[0032] Preferably, a solid-liquid separation device is further arranged between the biomass saccharification device and the foam matrix liquid blending device.

[0033] Preferably, a solid-liquid separation device is further arranged between the impregnation device and the drying and crushing device.

[0034] Compared with the prior art, the application has the following beneficial effects:

[0035] 1. The preparation method can realize pyrolysis, saccharification, blending, impregnation and mixing in a continuous production line, solves the problems of lack of odor inhibitor preparation technology and batch production of biochar-based high-barrier odor inhibitors in China, and meets the batch demand for efficient odor inhibitors in the field of site remediation.

[0036] 2, The application uses biomass and clay minerals as basic raw materials to produce high-barrier odor inhibitors. In the application, stabilizers are added to the biomass matrix liquid to enhance foam stability, thickening agents are added to enhance foam liquid viscosity, increase foam liquid thickness, and strengthen foam stability, and surfactants are added to enhance foam hydrophobicity. At the same time, the application adds multiple barrier measures to the foam matrix liquid to block odors, including the adsorption of modified clay minerals and carbon materials, achieving efficient odor barrier. Compared with traditional odor inhibitors, the application is more stable, has a long odor control time, and is environmentally friendly.

[0037] 3, The preparation device of the application forms a continuous production line through linkage between each device, which can realize efficient batch production of high-barrier odor inhibitor materials. By setting a high-viscosity mixing and stirring device, the foam inhibitor matrix liquid, clay and biochar material can be uniformly mixed, and the odor control function of the high-barrier odor inhibitor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 Figure 1 is a structural schematic diagram of a biochar-based high-barrier odor inhibitor preparation device according to the application.

[0039] Figure 2 Figure 4 is a test result diagram of the odor inhibition effect of the biochar-based high-barrier odor inhibitor in the test field in the embodiment of the application. DETAILED DESCRIPTION

[0040] The advantages and characteristics of the application will become more apparent with the description. However, these embodiments are only exemplary and do not constitute any limitation on the scope of the application. Those skilled in the art should understand that the details and forms of the technical solutions of the application can be modified or replaced without departing from the spirit and scope of the application, and such modifications and replacements fall within the protection scope of the application.

[0041] EMBODIMENT

[0042] Please refer to Figure 1 The preparation device of the biochar-based high-barrier odor inhibitor of the embodiment comprises:

[0043] The biomass raw material crushing device, the two-stage medium-high temperature pyrolysis device, the biochar ball milling device and the high-viscosity mixing and stirring device are connected in sequence through pipelines. At the same time, the biomass raw material crushing device is also connected to the high-viscosity mixing and stirring device through pipelines in sequence through the biomass saccharification device and the foam matrix liquid preparation device. At the same time, the device also comprises a clay mineral ball milling device, which is connected to the high-viscosity mixing and stirring device through pipelines in sequence through the impregnation device and the drying and crushing device.

[0044] The preparation device forms a continuous production line through linkage between each device.

[0045] The two-stage medium-high temperature pyrolysis device has a high-temperature vacuum pyrolysis section as the first section and a medium-temperature water vapor modification section as the second section.

[0046] The biomass saccharification device and the foam base liquid preparation device are further provided with a solid-liquid separation device.

[0047] The impregnation device and the drying and crushing device are further provided with a solid-liquid separation device.

[0048] By using the preparation device, the preparation method of the biochar-based high-barrier odor inhibitor of the embodiment includes the following steps:

[0049] (1) The biomass raw material composed of husks and straws is sent into a biomass raw material crushing device, crushed to a particle size of 0.01 mm, and then sent into a two-stage medium-high temperature pyrolysis device for two-stage pyrolysis and carbonization reaction. The first section is a high-temperature vacuum pyrolysis section with a temperature of 600°C and a time of 2h, and the second section is a medium-temperature water vapor modification section with a temperature of 200°C and a time of 0.5h. After the biomass raw material is subjected to the pyrolysis and carbonization reaction, biochar is formed, which is sent into a biochar ball milling device to be ball milled to a particle size of 5μm to obtain a biochar material, which is then sent into a high-viscosity mixing and stirring device.

[0050] (2) At the same time, the biomass raw material composed of husks and straws with a particle size of 0.01 mm in the biomass raw material crushing device is sent into a biomass saccharification device to perform saccharification reaction with an alkali solution. The saccharification reaction temperature is 80°C, and the time is 2h. A saccharification base liquid with a viscosity of 800CP is formed. Then, the separated liquid is sent into a foam base liquid preparation device through a solid-liquid separation device. After the addition of a stabilizer, a thickening agent, and a surfactant, the mixture is stirred at a speed of 500r / min for 6h to form a foam base liquid, which is then sent into the high-viscosity mixing and stirring device.

[0051] (3) At the same time, bentonite is sent into a clay mineral ball milling device to be ball milled to a particle size of 5μm, and then sent into an impregnation device for layer expansion modification impregnation. The impregnation liquid is a surfactant, and the ratio of the surfactant to the clay mineral is 50:1. The impregnation temperature is 30°C, and the time is 1h. Then, the separated solid is sent into a drying and crushing device through a solid-liquid separation device, dried and crushed to a particle size of 5μm to form clay mineral particles, which are then sent into the high-viscosity mixing and stirring device.

[0052] (4) In a high-viscosity mixing and stirring device, 5 kg of the biochar material obtained in step (1), 90 kg of the foam base liquid obtained in step (2), and 5 kg of the clay mineral particles obtained in step (3) are mixed and stirred at a temperature of 80°C under vacuum at a rate of 2000 r / min for 12 h to obtain a biochar-based high-barrier odor inhibitor, and the steps are connected by linkage to form a continuous production line.

[0053] The biochar-based high-barrier odor inhibitor prepared in this example is tested for odor inhibition effect on a test site, and is uniformly laid on the surface of the odor soil using a spraying device, with a laying height of 7 cm. The test results before and after spraying are shown in Table 1. Figure 2 As can be seen, the biochar-based high-barrier odor inhibitor of the present application has excellent performance, with a barrier efficiency of 95% or more for odor substances such as benzene, xylene, and styrene, and a stable foam structure for 24 h.

Claims

1. A method for preparing a biochar-based high-barrier odor inhibitor, characterized in that: The following steps are involved: (1) The biomass raw material is crushed and subjected to pyrolysis and carbonization reaction under a medium-high temperature environment to form biochar, which is then ball-milled to obtain a biochar material; the pyrolysis and carbonization reaction is divided into two stages, the first stage is a high-temperature vacuum pyrolysis stage, the temperature is 200-600°C, and the time is 1-4 hours; the second stage is a medium-temperature water vapor modification stage, the temperature is 50-200°C, and the time is 0-1 hour; (2) crushing the biomass raw material and reacting it with alkaline solution, wherein the saccharification reaction temperature is 20-100° C. and the time is 1-24 hours to form a saccharification matrix liquid, wherein the viscosity of the saccharification matrix liquid is 600-1000CP, and stirring and compounding a stabilizer, a thickener and a surfactant to form a foam matrix liquid; (3) ball-milling the clay mineral and then performing layer expansion and modification impregnation in an impregnation device, drying and crushing the clay mineral particles; the impregnation liquid in the impregnation process is a surfactant, and the mass ratio of the impregnation liquid to the clay mineral is 50-100:1; the temperature of the impregnation process is 20-40° C., and the time is 1-24 hours; (4) In a high-viscosity mixing and stirring device, the biochar material obtained in step (1), the foam-based liquid obtained in step (2), and the clay mineral particles obtained in step (3) are mixed and stirred to obtain a biochar-based high-barrier odor inhibitor, wherein the high-viscosity mixing and stirring environment is vacuum, the temperature is 10-100°C, the time is 1-24h, and the speed is 2000-3000r / min.

2. The preparation method according to claim 1, characterized in that Each step is linked to form a continuous production line.

3. The preparation method according to claim 1, characterized in that In step (1) and step (2), the biomass raw material is one of rice husks and straws, or a combination thereof.

4. A biochar-based high-barrier odor inhibitor, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 3.

5. A device for preparing a biochar-based high-barrier odor inhibitor, characterized in that: include: A biomass raw material crushing device, a two-stage medium-high temperature pyrolysis device, a biochar ball milling device, and a high-viscosity mixing and stirring device are sequentially connected through pipelines; at the same time, the biomass raw material crushing device is also sequentially connected to a biomass saccharification device and a foam base liquid preparation device to the high-viscosity mixing and stirring device through pipelines; at the same time, the device also includes a clay mineral ball milling device, and the clay mineral ball milling device is sequentially connected to an impregnation device and a drying and crushing device to the high-viscosity mixing and stirring device through pipelines; Among them, the first section of the two-stage medium and high temperature pyrolysis equipment is a high-temperature vacuum pyrolysis section, and the second section is a medium-temperature water vapor modification section.

6. The preparation device according to claim 5, characterized in that: The various devices in the preparation apparatus are linked together to form a continuous production line.

7. The preparation device according to claim 5, characterized in that: A solid-liquid separation device is also provided between the biomass saccharification device and the foam base liquid preparation device.

8. The preparation device according to claim 5, characterized in that: A solid-liquid separation device is further provided between the impregnation device and the drying and crushing device.

Images