CN116803969A - Method for preparing acetic acid by using natural gas and carbon dioxide - Google Patents
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 title claims abstract description 195
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 94
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 46
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000003345 natural gas Substances 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 66
- 239000000047 product Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 11
- 238000006555 catalytic reaction Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 24
- 230000008569 process Effects 0.000 description 13
- 230000003197 catalytic effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 6
- 238000001308 synthesis method Methods 0.000 description 6
- 230000006315 carbonylation Effects 0.000 description 5
- 238000005810 carbonylation reaction Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910001093 Zr alloy Inorganic materials 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical class OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- WJKHJLXJJJATHN-UHFFFAOYSA-N triflic anhydride Chemical compound FC(F)(F)S(=O)(=O)OS(=O)(=O)C(F)(F)F WJKHJLXJJJATHN-UHFFFAOYSA-N 0.000 description 2
- QAEDZJGFFMLHHQ-UHFFFAOYSA-N trifluoroacetic anhydride Chemical compound FC(F)(F)C(=O)OC(=O)C(F)(F)F QAEDZJGFFMLHHQ-UHFFFAOYSA-N 0.000 description 2
- 238000007039 two-step reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- FSJSYDFBTIVUFD-XHTSQIMGSA-N (e)-4-hydroxypent-3-en-2-one;oxovanadium Chemical compound [V]=O.C\C(O)=C/C(C)=O.C\C(O)=C/C(C)=O FSJSYDFBTIVUFD-XHTSQIMGSA-N 0.000 description 1
- 239000004278 EU approved seasoning Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 229920006221 acetate fiber Polymers 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- -1 anhydride compound Chemical class 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000011194 food seasoning agent Nutrition 0.000 description 1
- 238000010574 gas phase reaction Methods 0.000 description 1
- 238000007210 heterogeneous catalysis Methods 0.000 description 1
- 239000002638 heterogeneous catalyst Substances 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000007172 homogeneous catalysis Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910000008 nickel(II) carbonate Inorganic materials 0.000 description 1
- ZULUUIKRFGGGTL-UHFFFAOYSA-L nickel(ii) carbonate Chemical compound [Ni+2].[O-]C([O-])=O ZULUUIKRFGGGTL-UHFFFAOYSA-L 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001896 polybutyrate Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000013599 spices Nutrition 0.000 description 1
- HIFJUMGIHIZEPX-UHFFFAOYSA-N sulfuric acid;sulfur trioxide Chemical compound O=S(=O)=O.OS(O)(=O)=O HIFJUMGIHIZEPX-UHFFFAOYSA-N 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical class OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method for preparing acetic acid by using natural gas and carbon dioxide, which takes methyl iodide and water vapor as catalysts to enable the carbon dioxide and the methane to react to generate reaction products, and the acetic acid product is obtained by separating the reaction products. The method provides a high yield acetic acid production process in which methane and carbon dioxide are directly reacted without additional reaction raw materials.
Description
Technical Field
The invention relates to a method for preparing acetic acid in the field of organic chemistry, in particular to a method for preparing acetic acid by utilizing natural gas and carbon dioxide.
Background
Acetic acid, also known as acetic acid, is an important feedstock in both the food industry and the chemical industry. Acetic acid, for example, can be used as an acidulant, flavoring and spice for vinegar, beverages, cans, and other seasonings, and the like. Acetic acid belongs to a large number of chemical products, is one of the most important organic acids, is widely applied to vinyl acetate, acetic anhydride, acetate fibers, metal acetate, acetate and the like, and has wide application in pesticide, medicine, dye, photography and rubber industries. With the rapid development of downstream industries such as vinyl acetate, biodegradable PBAT plastic and the like, the use amount of acetic acid is greatly increased, and the acetic acid becomes an important component of national economy.
The preparation method of acetic acid comprises a biological synthesis method and an artificial synthesis method, wherein the biological synthesis method is to prepare the acetic acid by utilizing bacterial fermentation, and the biological synthesis method only occupies a very small part of the yield of the acetic acid in the whole world at present, and most of the acetic acid is prepared by adopting an industrial synthesis method. Among industrial synthesis methods of acetic acid, an acetaldehyde method, an ethylene direct oxidation method, a methanol carbonylation method, and the like are experienced, and the most widely used method at present is the methanol carbonylation method for producing acetic acid. As early as 1925, selanis, UK developed the first pilot plant for the production of acetic acid by methylcarbonylation. In 1970, the us mendo company built a device using this process, so rhodium catalyzed methylcarbonylation to acetic acid became the dominant commercial mendo process for acetic acid. Later in the 90 s, the great Britain petroleum successfully commercializes the Cativa catalytic method, and the ruthenium catalyst is adopted, so that the environment-friendly efficiency is higher than that of the Meng Shandou method.
In the methanol carbonylation process, methanol is not a naturally occurring raw material, and needs to be industrially synthesized, and methanol and carbon monoxide have relatively high toxicity, so that more attention is paid to cost and safety when the two main raw materials are used for producing acetic acid.
Relatively, methane, which corresponds to methanol, is the simplest organic compound and is the main component naturally occurring in natural gas with a high reserves; carbon dioxide corresponding to carbon monoxide is also a gas existing in large quantity in the air, and a large quantity of carbon dioxide is generated in industrial production and daily life of people, so that the toxicity of the carbon dioxide is not great, and the treatment of the carbon dioxide naturally has better return in terms of cost and safety. And the greenhouse effect influence caused by carbon dioxide is faced worldwide at present, and along with the control of carbon peak and carbon neutralization worldwide, the treatment of the excessive carbon dioxide is also urgently needed, and is an extremely important path from the aspect of changing waste into valuable.
While both theoretical and objective needs have desired to provide an industrial process for the rapid, simple production of acetic acid from methane (natural gas) and carbon dioxide, there has been little practical progress.
Although processes for the preparation of acetic acid involving gas phase reactions of methane and carbon monoxide and/or carbon dioxide containing iron or nickel carbonate in the presence of a catalyst at a pressure of from 12 to 50 atmospheres and at a temperature of from 120 to 300 ℃ have been disclosed in GB226248, GB 1924 (publication No. 1924, 12, 22, the contents of which are incorporated herein by reference in their entirety). However, the method has no reference to the application data in terms of raw material conversion rate, product yield, product purity and the like, and obviously does not reach the extent that the method can be popularized and applied in industry.
WO 96/05163A1 (publication date, month 22 1996, the contents of which are incorporated herein by reference in their entirety) discloses a process for the production of acetic acid comprising reacting methane and carbon dioxide at a temperature of 100 to 600 ℃ and a pressure of 0.1 to 20MPa using a catalyst comprising one or more group VIA, VIIA and/or VIIIA metals. However, the process is likewise silent about the application data in terms of conversion of the starting material, yield of the product, purity of the product, etc., only about the selectivity of acetic acid based on the starting material methane of 70 to 95%, and obviously not to the extent industrially applicable.
Chinese patent application CN1839110a (publication No. 2006, 9 and 27, the contents of which are incorporated herein by reference in their entirety) discloses contacting methane and carbon dioxide in an anhydrous environment in the presence of a transition metal catalyst and a reaction promoter, as well as an anhydride compound and optionally an acid, to produce a product comprising acetyl anhydride, which upon further contact with water can recover acetic acid. However, the process uses additional acids and anhydrides, trifluoroacetic anhydride/acid, fuming sulfuric acid, trifluoromethanesulfonic anhydride/acid, etc., and reaction promoters such as K 2 S 2 O 8 And a small amount of VO (acac) 2 Etc., the conversion based on methane is also only 7-16%, while also including the production of various by-products. Obviously, the method can not be popularized and applied industrially.
Chinese patent application CN1309114a (publication No. 2001, month 8 and 22, the contents of which are incorporated herein by reference in their entirety) discloses a method for synthesizing acetic acid in a heterogeneous catalytic system, CH 4 And CO 2 As a raw material, CH is adopted on a solid heterogeneous catalyst 4 And CO 2 Or CH (CH) 4 And CO 2 /H 2 The acetic acid is synthesized by alternative feeding, the reaction temperature is 100-600 ℃, the reaction pressure is normal pressure-20 Mpa, and the yield of the final product acetic acid is 0.020-0.137g/gcat. However, this method requires two steps and additional introduction of hydrogen for the reaction, and the catalytic system is heterogeneous, which has disadvantages in terms of catalytic efficiency and side reactions.
Disclosure of Invention
The invention aims to provide a high-yield acetic acid preparation method by directly reacting methane and carbon dioxide without additional reaction raw materials, which specifically comprises the following technical scheme:
the invention provides a method for preparing acetic acid by using natural gas and carbon dioxide, which is characterized by comprising the following steps: methyl iodide and water vapor are used as catalysts to react carbon dioxide with methane to generate reaction products, and acetic acid is obtained by separating the reaction products.
Preferably, the volume ratio of methane to carbon dioxide in the invention is 0.5-2:1.
preferably, the volume ratio of carbon dioxide to water vapor in the invention is 3-6:1.
preferably, the pressure of the reaction according to the invention is from atmospheric pressure to 20MPa.
Preferably, the temperature of the reaction according to the invention is between 100 and 600 ℃.
It is further preferred that the catalyst methyl iodide according to the present invention participates in catalysis in a flowing liquid form.
Preferably, the method further comprises the step of recycling the gas part of the reaction product of the invention to the reactor for reaction after the gas part is purified by flash washing.
Preferably, the method further comprises the step of rectifying and separating the liquid part of the reaction product to obtain the product acetic acid, wherein the residual liquid is returned to the reactor for circulation to participate in the reaction after light and heavy components are removed.
The invention has the beneficial effects that:
compared with the prior art for preparing acetic acid from methane and carbon dioxide, the invention has at least the following advantages:
1. the reaction of the invention does not need to add other high-cost raw materials such as acid, hydrogen, oxygen and the like, and the added water vapor is a low-cost clean raw material, so that the production cost can be further reduced and the safety can be improved.
2. The methyl iodide catalyst used in the invention is a cocatalyst used in the existing process for producing acetic acid by methanol carbonylation, but no one can apply the methyl iodide catalyst to the process for preparing acetic acid by reacting methane with carbon dioxide, the inventor team surprisingly finds that the combination of the methyl iodide catalyst and water can be directly used in the process for preparing acetic acid by reacting methane with carbon dioxide, and the research cost and the process adjustment cost of other catalysts can be saved.
3. By controlling the pressure and the temperature, all the reaction raw materials, the catalyst methyl iodide and the water can participate in the reaction in a liquid phase form, so that the reaction can be carried out in a liquid phase form of homogeneous catalysis reaction, and the method has more advantages in catalysis effect and reaction control compared with gas phase catalysis and/or heterogeneous catalysis reaction adopted in the prior art.
4. Because of the large difference in boiling points between the reaction feed and the catalyst methane, carbon dioxide, methyl iodide and product acetic acid, unreacted feed gas can be readily returned to the reactor for recycling (e.g., by flash evaporation) while product acetic acid is extracted in liquid form, e.g., by rectification.
5. The main reaction raw materials used in the invention can be respectively derived from natural gas and carbon dioxide generated by various industrial activities, and chemical raw materials do not need to be purchased specially, so that the carbon dioxide discharged by the enterprises or the partners of the enterprises can be utilized locally under the condition of carrying out the industrial activities, thereby changing waste into valuables and making positive contribution to global reduction of greenhouse effect.
6. The method for preparing acetic acid can efficiently convert raw materials, can convert about 60-70% of raw materials calculated by methane, has extremely high yield of the product acetic acid which can reach more than 90%, is far superior to the technology for preparing acetic acid by methane and carbon dioxide in the prior art, and has good industrial application prospect.
Detailed Description
The examples are presented for the purpose of better illustrating the invention and are not intended to limit the invention to the examples. Based on the above description, a person skilled in the art may make insubstantial modifications and adaptations to the following embodiments without departing from the spirit of the invention, and the scope of the invention is particularly pointed out in the claims.
The general reaction formula of the invention is: CO 2 + CH 4 CH 3 COOH
The process in which the catalyst methyl iodide and water vapor participate can be expressed as a two-step reaction of:
CO 2 + H 2 O + CH 3 I CH 3 COOH + HI
HI + CH 4 CH 3 I + H 2 O
therefore, the invention can obtain the target product acetic acid through one-step reaction in one reactor, and can also obtain the target product acetic acid through two-step reaction in two reactors.
The raw material of the present invention may be commercially available high-purity carbon dioxide (at least 90% by mass), or carbon dioxide recovered from various industrial activities may be used as it is or after being processed into high-purity carbon dioxide. Similarly, methane may be commercially available high purity methane (at least 90% by mass), or methane contained in natural gas may be used as it is or after being processed into high purity methane. From the viewpoints of improving the reaction quality and reducing side reactions, a high-purity reaction raw material is preferably used.
For the control of the reaction conditions of the invention, the raw material consumption, the reaction temperature and the pressure are main control points, and generally, the main raw materials of methane and carbon dioxide can be used in a mode of equal proportion by photographing, and the volume ratio of methane to carbon dioxide is preferably 0.5-2:1 so that both can sufficiently react. For the catalytic methyl iodide and water vapour, it may be provided in a proportion less than the main feedstock, preferably with a carbon dioxide to water vapour volume ratio of 3 to 6:1, the amount of methyl iodide is 0.1-2% wt of the total amount of the reaction raw materials, so long as the optimal catalytic effect can be achieved.
The reaction temperature and pressure of the present invention are usually required to be high temperature and high pressure to improve the conversion rate and yield, the reaction of the present invention can be performed under the condition of higher than normal pressure and can be performed under 40MPa at the highest, but the reaction pressure range of 2-8MPa is optimal to be used by combining the factors of conversion rate, yield and cost, etc.
The reaction of the present invention is usually carried out at high temperature and high pressure to increase the conversion and yield, and the reaction of the present invention is usually carried out at a temperature higher than 100 c and may be carried out at 220 c at the highest, but the reaction temperature range of 170 to 210 c is used optimally in combination with factors such as conversion, yield and cost.
Regarding the separation and recovery of the products after the reaction, adjustments may be made with reference to the process for the production of acetic acid by the carbonylation of methanol, a process which is a process for the production of acetic acid that is particularly well established in the art. For example, by utilizing the principle that the boiling points of substances at high and low pressures are different, a mixture obtained by liquid phase reaction at high pressure is subjected to flash evaporation at low pressure to carry out gas-liquid separation, unreacted raw material gas is returned to a reactor for recycling, and acetic acid as a product is separated by rectification.
Example 1
Preheating carbon dioxide and methane in a volume ratio of 5:5 to 100 ℃, and then introducing the preheated carbon dioxide and methane and water vapor (the volume ratio of carbon dioxide to water vapor is 5:1) into a zirconium alloy reactor loaded with methyl iodide. The temperature of the reactor is controlled to be 200 ℃, the reaction pressure is 3MPa, and the synthesis reaction is carried out in a liquid phase form to generate acetic acid.
After the reaction is finished, the product at the outlet of the reactor is subjected to gas-liquid separation through a flash evaporator, the separated gas part is returned to the inlet of a compressor to be returned to the reactor for circulation to participate in the reaction, the separated liquid part is rectified to obtain the product acetic acid, and the residual liquid after rectification enters the inlet of a high-pressure liquid pump to be returned to the reactor for circulation to participate in the reaction.
The methane conversion after completion of the reaction and the acetic acid yield of the product were measured by conventional methods in the art, and the result showed that the methane conversion was 70% and the acetic acid yield was 95%.
Example 2
The carbon dioxide and methane with the volume ratio of 4.5:4.5 are preheated to 100 ℃, and then are introduced into a zirconium alloy reactor loaded with methyl iodide together with water vapor (the volume ratio of the carbon dioxide to the water vapor is 4.5:1). The temperature of the reactor is controlled to be 195 ℃, the reaction pressure is 3.2MPa, and the synthesis reaction is carried out in a liquid phase form to generate acetic acid.
After the reaction is finished, the product at the outlet of the reactor is subjected to gas-liquid separation through a flash evaporator, the separated gas part is returned to the inlet of a compressor to be returned to the reactor for circulation to participate in the reaction, the separated liquid part is rectified to obtain the product acetic acid, and the residual liquid after rectification enters the inlet of a high-pressure liquid pump to be returned to the reactor for circulation to participate in the reaction.
The methane conversion after completion of the reaction and the acetic acid yield of the product were measured by a conventional method in the art, and the result showed that the methane conversion was 68% and the acetic acid yield was 93%.
Example 3
Preheating carbon dioxide and methane in a volume ratio of 5:5 to 100 ℃, and then introducing the preheated carbon dioxide and methane and water vapor (the volume ratio of carbon dioxide to water vapor is 5:1) into a zirconium alloy reactor loaded with methyl iodide. The temperature of the reactor is controlled to be 196 ℃, the reaction pressure is 3.5MPa, and the synthesis reaction is carried out in a liquid phase form to generate acetic acid.
After the reaction is finished, the product at the outlet of the reactor is subjected to gas-liquid separation through a flash evaporator, the separated gas part is returned to the inlet of a compressor to be returned to the reactor for circulation to participate in the reaction, the separated liquid part is rectified to obtain the product acetic acid, and the residual liquid after rectification enters the inlet of a high-pressure liquid pump to be returned to the reactor for circulation to participate in the reaction.
The methane conversion after completion of the reaction and the acetic acid yield of the product were measured by a conventional method in the art, and the result showed that the methane conversion was 69% and the acetic acid yield was 94%.
Claims (10)
1. A method for preparing acetic acid by using natural gas and carbon dioxide, which is characterized in that: methyl iodide and water vapor are used as catalysts to react carbon dioxide with methane to generate reaction products, and acetic acid is obtained by separating the reaction products.
2. The method according to claim 1, characterized in that: the volume ratio of methane to carbon dioxide is 0.5-2:1.
3. The method according to claim 1 or 2, characterized in that: the volume ratio of the carbon dioxide to the water vapor is 3-6:1.
4. A method according to any one of claims 1 to 3, characterized in that: the pressure of the reaction is between normal pressure and 20MPa.
5. The method according to any one of claims 1 to 4, wherein: the temperature of the reaction is 100-600 ℃.
6. The method according to any one of claims 1-5, wherein: the methyl iodide participates in catalysis in a flowing liquid form.
7. The method according to any one of claims 1-6, wherein: and returning the gas part of the reaction product to the reactor for circulation to participate in the reaction.
8. The method according to claim 7, wherein: the gas fraction is scrubbed by flash evaporation before being returned.
9. The method according to any one of claims 1-8, wherein: the method also comprises separating the liquid part of the reaction product to obtain the product acetic acid, and returning the residual liquid after removing the light and heavy components to the reactor to participate in the reaction in a circulating way.
10. The method according to claim 9, wherein: and rectifying to separate acetic acid product.
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| CN202210256133.XA CN116803969A (en) | 2022-03-16 | 2022-03-16 | Method for preparing acetic acid by using natural gas and carbon dioxide |
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| CN202210256133.XA CN116803969A (en) | 2022-03-16 | 2022-03-16 | Method for preparing acetic acid by using natural gas and carbon dioxide |
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