A low-temperature, low-power microwave treatment process for low-carbon alcohol compounds

Abstract

This invention relates to the field of low-carbon alcohol conversion, and more particularly to a low-temperature, low-power microwave processing technology for low-carbon alcohol compounds. Specifically, it includes: mixing low-carbon alcohol compounds with a microwave-absorbing material and reacting them under microwave conditions to produce hydrogen, carbon monoxide, carbon dioxide, and low-carbon hydrocarbon compounds; or, mixing low-carbon alcohol compounds, a microwave-absorbing material, and a catalyst and reacting them under microwave conditions to produce hydrogen, carbon monoxide, carbon dioxide, and low-carbon hydrocarbon compounds; wherein the mass ratio of low-carbon alcohol compounds to microwave-absorbing material is (0.01–5):1. This invention, through optimization of the reaction process and conditions, can effectively improve the conversion rate of low-carbon alcohol compounds and increase the hydrogen content in the products. Simultaneously, the process can significantly reduce the reaction temperature, while exhibiting high heating and reaction rates, low energy consumption, and better economic benefits, showing promising prospects for industrial application.

Description

Technical Field

[0001] This invention relates to the field of low-carbon alcohol conversion, and more particularly to a low-temperature, low-power microwave processing technology for low-carbon alcohol compounds. Background Technology

[0002] Currently, the conversion of low-carbon alcohols, which have relatively low economic and energy efficiency, into olefins and hydrogen energy, which have higher energy efficiency and are more environmentally friendly, is a research hotspot. For example, methanol, due to its low carbon content, high hydrogen content, and ease of storage and transportation, serves as an important strategic reserve energy source. Whether it is converted into high-economic-efficiency ethylene and propylene through molecular sieve catalysts, or through methanol decomposition, partial oxidation, and steam reforming of methanol into hydrogen, carbon monoxide, and carbon dioxide using metal catalysts, it has high economic value and social benefits.

[0003] Recent studies have shown that methanol reforming is a highly attractive option for hydrogen production because methanol is sulfur-free, has a high volumetric energy density, a hydrogen-to-carbon ratio of 4:1, and is biodegradable. Compared to other alcohols, methanol is the preferred choice because it does not contain C-C bonds, resulting in a much lower hydrogen extraction temperature of approximately 200-300°C, while ethanol and methane require much higher conversion temperatures of 400°C and 500°C, respectively.

[0004] Currently, under traditional conditions, the olefin conversion reaction of low-carbon alcohols remains quite demanding. For example, the optimal temperature for methanol conversion still needs to be above 300℃ to obtain good product selectivity. At the same time, the high temperature not only greatly increases the requirements for equipment and catalysts, but the high energy consumption required for the reaction also puts enormous pressure on the economy and the environment. For example, CN106008128 A discloses a reaction regeneration system and method for methanol-to-propylene, which uses a single-stage adiabatic fixed-bed reactor to produce olefins from methanol. The inlet pressure of the reactor is 0.15–1 MPa, and the reaction temperature is 350–450 °C. CN105949021 A discloses a system and method for methanol catalytic dehydration to produce propylene, which uses a fluidized bed reactor. The operating pressure of the dehydration reactor and catalyst regenerator is 0.1–1 MPa, the dehydration reaction temperature is 400–500 °C, and the catalyst regeneration temperature is 450–650 °C. CN 105060247 A discloses a start-up system for starting a reforming hydrogen production unit, which reports a methanol steam reforming reaction. The reforming hydrogen production unit includes a reformer shell and a combustion chamber and a reforming chamber located within the reforming hydrogen production unit shell. Generally, the reforming chamber requires a temperature of 350–409 °C, while the combustion chamber requires a temperature of 405–570 °C for the reforming hydrogen production unit to operate normally.

[0005] For the demanding conversion conditions of low-carbon alcohols, current technologies still focus on optimizing fluidized bed and fixed bed reactors, adjusting temperatures, and exploring new catalysts. No one has yet attempted to study the conversion of low-carbon alcohols under microwave conditions. Summary of the Invention

[0006] This invention provides a low-temperature, low-power microwave processing technology for low-carbon alcohol compounds, which solves the defects of high-temperature energy consumption in the conversion reaction of low-carbon alcohols in the prior art, and realizes a conversion processing technology for low-carbon alcohol compounds with rapid heating, low energy consumption, high conversion rate and high energy content in the product.

[0007] The conversion process for low-carbon alcohol compounds provided by this invention involves mixing the low-carbon alcohol compounds with microwave-absorbing materials and reacting them under microwave conditions to produce hydrogen, carbon monoxide, carbon dioxide, and low-carbon hydrocarbon compounds; or,

[0008] The low-carbon alcohol compound, the microwave-absorbing material, and the catalyst are mixed and reacted under microwave conditions to produce hydrogen, carbon monoxide, carbon dioxide, and low-carbon hydrocarbon compounds.

[0009] The mass ratio of the low-carbon alcohol compound to the microwave absorbing material is (0.01-5):1.

[0010] This invention discovers that under the high energy density of microwaves, the stability of chemical bonds is significantly affected, promoting the efficient conversion of low-carbon alcohols at relatively low temperatures, thereby effectively improving the conversion rate of low-carbon alcohols. Further research revealed that when the low-carbon alcohols and microwave-absorbing materials are in the aforementioned ratio, the hydrogen content in the product is significantly increased, and the carbon dioxide content in the product is effectively reduced, thus improving the product's value.

[0011] Preferably, the mass hourly space velocity (MSV) of the low-carbon alcohol compound feed is 0.01–5 h⁻¹. -1 .

[0012] More preferably, the mass hourly space velocity (MSV) of the low-carbon alcohol compound feed is 0.01–2 h⁻¹. -1 .

[0013] Preferably, the low-carbon alcohol compound, the microwave-absorbing material, and the catalyst are mixed under microwave conditions.

[0014] Preferably, the microwave absorbing material is selected from one or more of the following: carbon nanotubes, graphite, activated carbon, magnesium oxide, iron oxide, zinc oxide, calcium oxide, manganese oxide, phosphorus pentoxide, nickel oxide, titanium dioxide, aluminum oxide, molybdenum oxide, molybdenum sulfide, molybdenum carbide, copper sulfide, and silicon oxide.

[0015] More preferably, the microwave absorbing material is selected from one or more of magnesium oxide, iron oxide, zinc oxide, calcium oxide, manganese oxide, nickel oxide, aluminum oxide, molybdenum oxide, molybdenum carbide, silicon oxide, and carbon nanotubes, graphite, and activated carbon loaded with one or more elements selected from iron, nickel, copper, cobalt, platinum, and gold.

[0016] This invention discovers that the aforementioned microwave absorbing material, namely microwave absorber, not only has a good microwave absorption effect, but also plays a certain catalytic role, which is more conducive to the efficient conversion of low-carbon alcohol compounds.

[0017] More preferably, the microwave absorbing material is selected from one or more of carbon nanotubes, graphite, and activated carbon.

[0018] Preferably, the catalyst is one or more of molecular sieves, zirconium oxide, cerium oxide, and molecular sieves loaded with one or more elements selected from iron, nickel, copper, cobalt, platinum, and gold, as well as alumina, zinc oxide, zirconium oxide, iron oxide, and cerium oxide.

[0019] During the reaction process, the catalyst is prone to carbon buildup and deactivation. However, this invention unexpectedly discovered that the presence of carbon buildup on the catalyst can simultaneously improve the microwave absorption efficiency of the reaction system.

[0020] Preferably, when the microwave absorbing material is used continuously for more than 24 hours, it is calcined or ground; more preferably, it is calcined in air at a temperature of 300°C or higher for 1 to 3 hours; this can promote its effective activation and allow for multiple uses.

[0021] Preferably, when the reaction system contains one or more of the following elements loaded with 1 to 15 wt% iron, nickel, and cobalt: molecular sieves, alumina, zinc oxide, zirconium oxide, cerium oxide, carbon nanotubes, graphite, and activated carbon, the hydrogen and carbon monoxide content in the product increases while the carbon dioxide content decreases, further enhancing the product value.

[0022] More preferably, the reaction system contains one or more of the following elements loaded with 5-10 wt% of iron, nickel and cobalt: molecular sieves, alumina, zinc oxide, zirconium oxide and cerium oxide, carbon nanotubes, graphite and activated carbon, which will have a better effect.

[0023] The present invention has found that the above-mentioned catalyst can effectively reduce the carbon dioxide content in the product, increase the energy content in the product, and further improve the product value.

[0024] Preferably, when the reaction system consists of a low-carbon alcohol compound, a microwave-absorbing material, and a catalyst, the mass ratio of the catalyst to the microwave-absorbing material is (1:10) to (15:1).

[0025] In a preferred embodiment of the present invention, the conversion process of the low-carbon alcohol compounds is carried out under microwave, oxygen-free, normal pressure and 160-230°C conditions.

[0026] Preferably, the low-carbon alcohol compounds include all monohydric and polyhydric alcohols having 1 to 4 carbon atoms.

[0027] Preferably, during the reaction, the low-carbon alcohol compound is mixed with other raw materials in a gaseous form.

[0028] Preferably, the low-carbon alcohol compounds are heated and vaporized before being fed into the reactor during the reaction process.

[0029] More preferably, during the reaction process, the liquid low-carbon alcohol compound is converted into a gaseous state by bubbling with an inert gas before being fed into the reactor.

[0030] Preferably, the microwave reaction device used in the conversion process of the low-carbon alcohol compounds includes: a shell, an infrared temperature measuring device, an input power detector, a reflected power detector, a microwave generator, an integrated control system, and an automatic protection unit; wherein, the integrated control system monitors the input power, temperature, and reflected power in real time, and adjusts the input power according to the temperature, and controls the activation of the automatic protection unit according to the reflected power; when the reflected power is greater than 50% of the input power, the automatic protection unit is activated, and the reactor stops working; the microwave generator is a solid-state source.

[0031] Preferably, the housing of the microwave reaction device is made of stainless steel.

[0032] Preferably, the microwave frequency is 2.45 GHz or 915 MHz; more preferably, the microwave frequency is 2.45 GHz.

[0033] Preferably, the microwave heating mode is single-mode or multi-mode.

[0034] Based on the above technical solution, the beneficial effects of the present invention are as follows:

[0035] This invention provides a low-temperature, low-power microwave processing technology for low-carbon alcohol compounds. By optimizing the reaction process and conditions, it can effectively improve the conversion rate of low-carbon alcohol compounds and significantly increase the hydrogen content in the product, thereby enhancing the product's value. Furthermore, compared to traditional processes, this technology can significantly reduce the reaction temperature, while achieving higher heating and reaction rates and lower energy consumption. This results in lower requirements for equipment and microwave-absorbing materials, leading to cost savings, better economic benefits, and promising prospects for industrial application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a process flow diagram of the microwave processing technology described in this invention;

[0038] Figure 2 This is a schematic diagram of the production system described in this invention, wherein arrows represent the direction of gas flow, and cross symbols represent microwave absorbing materials; when the reaction system contains a catalyst, the cross symbols represent both the microwave absorbing material and the catalyst.

[0039] Reference numerals in the attached figures: 1-Inert gas generating device, 2-Flow meter, 3-Three-way valve, 4-Bubbler, 5-Microwave generator, 6-Product gas collecting device, 7-Gas chromatography device. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0041] In this invention, when the microwave-absorbing material is used continuously for more than 24 hours, those skilled in the art can, depending on the actual situation, calcine it in air at a temperature above 300°C for 1 to 3 hours to effectively activate it, thereby enabling multiple uses. The specific process flow is as follows: Figure 1 .

[0042] In a specific embodiment, the present invention also provides a production system for implementing the above-described microwave-treated methanol conversion method, the schematic diagram of which is shown in the figure below. Figure 2 The system includes: an inert gas generating device 1, a flow meter 2, a three-way valve 3, a bubbler 4, a microwave generator 5, a product gas collecting device 6, and a gas chromatograph 7. The outlet of the inert gas generating device 1 is connected to the first inlet of the three-way valve 3. The flow meter 2 is installed in the connection path between the first inlet of the three-way valve 3 and the outlet of the inert gas generating device 1. The bubbler 4 is connected to the second inlet of the three-way valve 3. The outlet of the three-way valve is connected to the gas inlet of the microwave generator 5. The product gas collecting device 6 and the gas chromatograph 7 are connected to the gas outlet of the microwave generator 5.

[0043] The gas chromatography detection conditions were as follows: GC-7820 gas chromatograph with TCD+FID online detection was used, TCD temperature was 70℃, FID was prepared at 70℃ and held for 16 min, then the temperature was increased to 210℃ at a rate of 10℃ / min and held for 15 min.

[0044] Example 1

[0045] This embodiment provides a method for methanol conversion using microwave treatment, and the specific reaction steps are as follows:

[0046] 1. Carbon nanotubes were added to a microwave reactor, and the input power was adjusted to 55W; methanol was bubbled using argon gas at a mass hourly space velocity (MSV) of 1 h⁻¹. -1 The methanol and carbon nanotubes were introduced into a microwave reactor at a mass ratio of 1:1 and reacted at 160°C. Gas chromatography was used to detect the gaseous product components in real time after 1 hour.

[0047] 2. Add a mixture of carbon nanotubes and molecular sieve H-ZSM5 (silicon-to-aluminum ratio of 2:1) at a mass ratio of 1:1 to a microwave reactor, and adjust the input power to 60W; then use argon gas to bubble methanol at a mass hourly space velocity (MSV) of 1 h⁻¹. -1 The methanol and carbon nanotubes were introduced into a microwave reactor at a mass ratio of 1:1 and reacted at 160°C. Gas chromatography was used to detect the gaseous product components in real time after 1 hour.

[0048] 3. Add zinc oxide to the microwave reactor and set the input power to 60W; use argon gas via bubbling to achieve a mass hourly space velocity (MSV) of 0.01 h⁻¹. -1 Methanol was introduced into the reactor at a mass ratio of 0.01:1 to zinc oxide, and the reaction was carried out at 160°C. Gas chromatography was used to detect the gaseous product components in real time after 1 hour.

[0049] 4. Add a mixture of zinc oxide and molecular sieve H-ZSM5 (silicon-to-aluminum ratio of 2:1) at a mass ratio of 5:1 to a microwave reactor, adjust the input power to 60W, and use argon gas to bubble methanol at a mass hourly space velocity (HHSV) of 0.07 h⁻¹. -1 The mixture was introduced into a microwave reactor with a methanol to zinc oxide mass ratio of 0.07:1, and the reaction was carried out at 160℃. After 1 hour, the gaseous product components were analyzed in real time by gas chromatography.

[0050] 5. Add carbon nanotubes to the microwave reactor and adjust the input power to 55W; then use argon gas to bubble methanol at a mass hourly space velocity (MSV) of 1 h⁻¹. -1 The methanol and carbon nanotubes loaded with 5 wt% Ni were introduced into a microwave reactor at a mass ratio of 1:1 and reacted at 160 °C. After 1 hour, the gaseous product components were detected in real time by gas chromatography.

[0051] The specific product composition is shown in Table 1:

[0052] Table 1

[0053]

[0054] Example 2

[0055] A method for microwave-treated ethanol conversion, the specific reaction process of which is as follows:

[0056] 1. Carbon nanotubes were added to a microwave reactor, and the input power was adjusted to 55W; ethanol was then propelled using argon gas at a mass hourly space velocity (MSV) of 0.3 h⁻¹ via a bubbling method. -1 The ethanol and carbon nanotubes were introduced into a microwave reactor at a mass ratio of 0.3:1 and reacted at 160°C. After 1 hour, the gaseous product components were detected in real time by gas chromatography.

[0057] 2. Add a mixture of carbon nanotubes and molecular sieve H-ZSM5 (silicon-to-aluminum ratio of 2:1) at a mass ratio of 1:1 to a microwave reactor, and adjust the input power to 70W; then use argon gas to bubble ethanol at a mass hourly space velocity (HHSV) of 0.3 h⁻¹. -1 The ethanol and carbon nanotubes were introduced into a microwave reactor at a mass ratio of 0.3:1 and reacted at 180°C. After 1 hour, the gaseous product components were detected in real time by gas chromatography.

[0058] 3. Add zinc oxide to the microwave reactor and set the input power to 70W; use argon gas via bubbling at a mass hourly space velocity (HHSV) of 0.05 h⁻¹. -1 Ethanol was introduced into the reactor at a mass ratio of 0.05:1 to zinc oxide, and the reaction was carried out at 180°C. After 1 hour, gas chromatography was used to detect the gaseous product components in real time.

[0059] 4. Add a mixture of zinc oxide and molecular sieve H-ZSM5 (silicon-to-aluminum ratio of 2:1) at a mass ratio of 5:1 to a microwave reactor, adjust the input power to 70W, and use argon gas to bubble ethanol at a mass hourly space velocity (HHSV) of 0.05 h⁻¹. -1 The mixture was introduced into a microwave reactor with an ethanol to zinc oxide mass ratio of 0.05:1, and the reaction was carried out at 180°C. After 1 hour, the gaseous product components were analyzed in real time by gas chromatography.

[0060] The specific product composition is shown in Table 2:

[0061] Table 2

[0062]

[0063] Example 3

[0064] A method for the microwave treatment of n-propanol conversion, the specific reaction process is as follows:

[0065] 1. Carbon nanotubes were added to a microwave reactor, and the input power was adjusted to 70W; then, using a bubbling method, n-propanol was propelled with argon gas at a mass hourly space velocity (HHSV) of 0.1 h⁻¹. -1 The mixture was introduced into a microwave reactor with a propanol to carbon nanotube mass ratio of 0.1:1, and the reaction was carried out at 180°C. After 1 hour, gas chromatography was used to detect the gaseous product components in real time.

[0066] 2. Add a mixture of carbon nanotubes and molecular sieve H-ZSM5 (silicon-to-aluminum ratio of 2:1) at a mass ratio of 1:1 to a microwave reactor, and adjust the input power to 70W; then use argon gas to bubble n-propanol at a mass hourly space velocity (HHSV) of 0.1 h⁻¹. -1 The mixture was introduced into a microwave reactor with a propanol to carbon nanotube mass ratio of 0.1:1, and the reaction was carried out at 180°C. After 1 hour, gas chromatography was used to detect the gaseous product components in real time.

[0067] 3. Add zinc oxide to the microwave reactor and set the input power to 70W; use argon gas via bubbling to achieve a mass hourly space velocity (HHSV) of 0.02 h⁻¹. -1 n-Propanol was introduced into the reactor at a mass ratio of 0.02:1 to zinc oxide, and the reaction was carried out at 180°C. Gas chromatography was used to detect the gaseous product components in real time after 1 hour.

[0068] 4. Add a mixture of zinc oxide and molecular sieve H-ZSM5 (silicon-to-aluminum ratio of 2:1) at a mass ratio of 5:1 to the microwave reactor, adjust the input power to 70W, and use argon gas to bubble n-propanol at a mass hourly space velocity (HHSV) of 0.02 h⁻¹. -1 The mixture was introduced into a microwave reactor with a propanol to zinc oxide mass ratio of 0.02:1, and the reaction was carried out at 180°C. After 1 hour, gas chromatography was used to detect the gaseous product components in real time.

[0069] The specific product composition is shown in Table 3:

[0070] Table 3

[0071]

[0072] Example 4

[0073] A method for microwave treatment of isopropanol conversion, the specific reaction process is as follows:

[0074] 1. Add carbon nanotubes to a microwave reactor and adjust the input power to 70W; then use argon gas to bubble n-propanol at a mass hourly space velocity (HHSV) of 0.5 h⁻¹. -1 The isopropanol and carbon nanotubes were introduced into a microwave reactor at a mass ratio of 0.5:1 and reacted at 180°C. Gas chromatography was used to detect the gaseous product components in real time after 1 hour.

[0075] 2. Add a mixture of carbon nanotubes and molecular sieve H-ZSM5 (silicon-to-aluminum ratio of 2:1) at a mass ratio of 1:1 to a microwave reactor, and adjust the input power to 70W; then use argon gas to bubble n-propanol at a mass hourly space velocity (HHSV) of 0.5 h⁻¹. -1 The isopropanol and carbon nanotubes were introduced into a microwave reactor at a mass ratio of 0.5:1 and reacted at 180°C. Gas chromatography was used to detect the gaseous product components in real time after 1 hour.

[0076] 3. Add zinc oxide to the microwave reactor and set the input power to 70W; use argon gas via bubbling at a mass hourly space velocity (MSV) of 0.1 h⁻¹. -1 n-Propanol was introduced into the reactor, and the mass ratio of isopropanol to zinc oxide was 0.1:1. The reaction was carried out at 180°C. After 1 hour, gas chromatography was used to detect the gaseous product components in real time.

[0077] 4. Add a mixture of zinc oxide and molecular sieve H-ZSM5 (silicon-to-aluminum ratio of 2:1) at a mass ratio of 5:1 to a microwave reactor, adjust the input power to 70W, and use argon gas to bubble n-propanol at a mass hourly space velocity (HHSV) of 0.1 h⁻¹. -1 The mixture was introduced into a microwave reactor with isopropanol and zinc oxide at a mass ratio of 0.1:1, and the reaction was carried out at 180°C. After 1 hour, the gaseous product components were analyzed in real time by gas chromatography.

[0078] The specific product composition is shown in Table 4:

[0079] Table 4

[0080]

[0081] Comparative Example 1

[0082] The comparative example uses the same process conditions as Example 1, except that the mass ratio of methanol to carbon nanotubes is 5.8:1 and 9:1, and the mass ratio of carbon nanotubes to H-ZSM5(21) is 1:1. The specific product composition is shown in Table 5.

[0083] Table 5

[0084]

[0085]

[0086] As shown in Table 5, although increasing the mass ratio can achieve a higher conversion rate, it inhibits the production of hydrogen, significantly reduces the hydrogen content in the product gas, significantly increases the carbon dioxide content, and most of the methanol is converted into carbon deposits on the surface of the catalyst and microwave absorbing material, which is not conducive to the reaction.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for the conversion of lower alcohols, characterized in that, Low-carbon alcohol compounds are mixed with microwave-absorbing materials and reacted under microwave conditions to produce hydrogen, carbon monoxide, carbon dioxide, and low-carbon hydrocarbon compounds. The microwave absorbing material is selected from one or more of carbon nanotubes, zinc oxide, and carbon nanotubes loaded with one or more elements such as nickel and platinum; the mass ratio of the low-carbon alcohol compound to the microwave absorbing material is (0.01~5):

1. During the reaction, the low-carbon alcohol compound is fed after being heated and vaporized, and the mass space velocity of the low-carbon alcohol compound feed is 0.01~5h -1 ; The reaction is carried out under microwave, oxygen-free, normal pressure and 160~230°C conditions, and the power of the microwave is 55W, 60W or 70W.

2. A process for the conversion of a lower alcohols compound, characterized in that, The low-carbon alcohol compound, the microwave-absorbing material, and the catalyst are mixed and reacted under microwave conditions to produce hydrogen, carbon monoxide, carbon dioxide, and low-carbon hydrocarbon compounds. The microwave absorbing material is selected from one or more of carbon nanotubes, zinc oxide, and carbon nanotubes loaded with one or more elements such as nickel and platinum; the mass ratio of the low-carbon alcohol compound to the microwave absorbing material is (0.01~5):1; the mass ratio of the catalyst to the microwave absorbing material is (1:10)~(15:1). During the reaction, the low-carbon alcohol compound is fed after being heated and vaporized, and the mass space velocity of the low-carbon alcohol compound feed is 0.01~5h -1 ; The reaction is carried out under microwave, oxygen-free, normal pressure and 160~230°C conditions, and the power of the microwave is 55W, 60W or 70W.

3. The conversion process of lower alcohols according to claim 2, characterized in that, The catalyst is a molecular sieve.

4. The conversion process of lower alcohols according to claim 1 or 2, characterized in that, The low-carbon alcohols include all monohydric and polyhydric alcohols with 1 to 4 carbon atoms.

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