WO2022255576A1 - 이소프로필 알코올 제조방법 - Google Patents
이소프로필 알코올 제조방법 Download PDFInfo
- Publication number
- WO2022255576A1 WO2022255576A1 PCT/KR2021/018304 KR2021018304W WO2022255576A1 WO 2022255576 A1 WO2022255576 A1 WO 2022255576A1 KR 2021018304 W KR2021018304 W KR 2021018304W WO 2022255576 A1 WO2022255576 A1 WO 2022255576A1
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- WIPO (PCT)
- Prior art keywords
- stream
- isopropyl alcohol
- supplied
- column
- gas purification
- Prior art date
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- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 title claims abstract description 543
- 238000000034 method Methods 0.000 title abstract description 27
- 238000000746 purification Methods 0.000 claims abstract description 149
- 239000007789 gas Substances 0.000 claims abstract description 117
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 105
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 105
- 239000000178 monomer Substances 0.000 claims abstract description 100
- 239000011261 inert gas Substances 0.000 claims abstract description 96
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 83
- 238000010521 absorption reaction Methods 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 claims description 34
- 238000010992 reflux Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 description 21
- 238000000926 separation method Methods 0.000 description 21
- 238000006243 chemical reaction Methods 0.000 description 15
- 239000002904 solvent Substances 0.000 description 11
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 10
- 239000012071 phase Substances 0.000 description 7
- 241000183024 Populus tremula Species 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010574 gas phase reaction Methods 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 5
- 239000001294 propane Substances 0.000 description 5
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/17—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrogenation of carbon-to-carbon double or triple bonds
- C07C29/172—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrogenation of carbon-to-carbon double or triple bonds with the obtention of a fully saturated alcohol
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/03—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by addition of hydroxy groups to unsaturated carbon-to-carbon bonds, e.g. with the aid of H2O2
- C07C29/04—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by addition of hydroxy groups to unsaturated carbon-to-carbon bonds, e.g. with the aid of H2O2 by hydration of carbon-to-carbon double bonds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
- C07C31/02—Monohydroxylic acyclic alcohols
- C07C31/10—Monohydroxylic acyclic alcohols containing three carbon atoms
Definitions
- the present invention relates to a method for producing isopropyl alcohol, and more particularly, to a method for separating isopropyl alcohol with high purity from a reaction product of an isopropyl alcohol production process and effectively recovering unreacted materials.
- Isopropyl alcohol is used for various purposes, including applications such as detergents in the electronics industry, such as manufacturing semiconductors and liquid crystal displays (LCDs).
- the process for producing isopropyl alcohol uses, for example, propylene and water as raw material components. At this time, the propylene and water react to produce isopropyl alcohol.
- the reaction product of the isopropyl alcohol production process includes isopropyl alcohol, unreacted propylene monomer and unreacted water. At this time, isopropyl alcohol is separated and recovered from the reaction product of the isopropyl alcohol production process, and unreacted propylene monomer is recovered and reused in the isopropyl alcohol production process.
- the problem to be solved in the present invention is to separate the isopropyl alcohol and unreacted propylene monomer from the reaction product of the isopropyl alcohol production process in order to solve the problems mentioned in the background art of the above invention. It is to provide an effective recovery method.
- the recovered in separating the reaction product stream of propylene monomer and water using an absorption tower, a first gas purification column, a second gas purification column, and an inert gas removal column, when recovering unreacted propylene monomer to the reactor, the recovered It is possible to provide a method for preventing the inclusion of isopropyl alcohol in the stream and preventing the inclusion of unreacted propylene in the stream supplied to the IPA purification unit.
- the present invention provides a reaction product stream obtained by reacting propylene monomer and water in a reactor to an absorption tower; A bottoms off stream containing isopropyl alcohol from the absorption tower is fed to a first gas purification column, a portion of the top off stream containing unreacted propylene monomer is fed to a second gas purification column, and the remaining stream is fed to a second gas purification column.
- the reaction product in the isopropyl alcohol production process through the reaction of propylene monomer and water is obtained by using an absorption tower, a first gas purification column, a second gas purification column, and an inert gas removal column. In separating, the separation efficiency can be increased.
- isopropyl alcohol is prevented from being accompanied by unreacted propylene monomer circulated to the reactor, thereby promoting the forward reaction of the equilibrium reaction in the reactor, thereby increasing the production of isopropyl alcohol, and supplying to the IPA purification unit
- the loss of propylene monomer can be reduced by preventing the outflow of unreacted propylene monomer into the stream.
- separation efficiency may be improved by controlling supply stages of the streams supplied to the second gas purification column and the inert gas removal column, respectively.
- the separation efficiency of the first gas purification column and the second gas purification column is improved by pre-separating the absorption tower lower discharge stream using one or more flash drums before supplying it to the first gas purification column,
- the device size of the column can be reduced.
- 1 and 2 are each a process flow diagram of a method for producing isopropyl alcohol according to an embodiment of the present invention.
- FIG. 3 is a process flow diagram of a method for producing isopropyl alcohol according to a comparative example.
- the term 'stream' may refer to a flow of a fluid in a process, or may also refer to a fluid itself flowing in a pipe.
- the stream may mean a fluid itself and a flow of the fluid flowing in a pipe connecting each device at the same time.
- the fluid may mean gas or liquid. At this time, the case where the fluid contains a solid component is not excluded.
- a method for producing isopropyl alcohol is provided.
- the isopropyl alcohol may be produced through a vapor phase reaction between propylene monomer and water.
- a feed stream containing propylene monomer and water is supplied to a reactor, and a reaction product generated in the reactor may include isopropyl alcohol, unreacted propylene monomer, and unreacted water.
- isopropyl alcohol is separated and recovered from the reaction product, and unreacted propylene monomer is recovered and reused in the isopropyl alcohol manufacturing process.
- the method for producing isopropyl alcohol includes: supplying a reaction product stream obtained by reacting propylene monomer and water in a reactor to an absorption tower (100); A bottom discharge stream containing isopropyl alcohol from the absorption tower (100) is supplied to the first gas purification column (200), and a part of the top discharge stream containing unreacted propylene monomer is supplied to the second gas purification column (300).
- a feed stream containing propylene monomer and water may be supplied to the reactor, and a reaction product containing isopropyl alcohol may be prepared by gas-phase reaction.
- the molar ratio of water to propylene monomer contained in the feed stream may be 0.3 to 0.5, 0.35 to 0.5, or 0.35 to 0.45.
- the reactor can be operated under optimal conditions for efficiently producing isopropyl alcohol through a gas phase reaction between propylene monomer and water.
- the operating pressure of the reactor is 30 kg/cm 2 g to 50 kg/cm 2 g, 35 kg/cm 2 g to 50 kg/cm 2 g, or 35 kg/cm 2 g to 45 kg/cm 2 g
- the operating temperature may be 180 °C to 220 °C, 185 °C to 220 °C, or 190 °C to 215 °C.
- the reaction product produced by gas-phase reaction of propylene monomer and water in the reactor is gas-phase, and may include isopropyl alcohol, unreacted propylene monomer, and unreacted water.
- the gaseous reaction product discharged from the reactor may be condensed into a liquid reaction product using one or more heat exchangers and then supplied to the absorption tower 100.
- the temperature of the reaction product supplied to the absorption tower 100 may be, for example, 105 °C to 150 °C, 110 °C to 140 °C, or 115 °C to 140 °C.
- the gaseous reaction product discharged from the reactor may exchange heat with a feed stream supplied to the reactor in one or more heat exchangers.
- the temperature of the feed stream passing through the one or more heat exchangers may be heated to, for example, 170 °C to 210 °C, 180 °C to 200 °C, or 185 °C to 195 °C.
- the gaseous reaction product discharged from the reactor may be separated into a first gaseous reaction product stream and a liquid second reaction product stream while passing through one or more heat exchangers.
- the first reaction product stream and the second reaction product stream may be separated and discharged through a separate pipe formed in the downstream heat exchanger, or may be separated through a gas-liquid separation device installed at the rear stage of the heat exchanger.
- the flow rate ratio of the first reaction product stream to the flow rate of the second reaction product stream may be 5 to 11, 6 to 10, or 7 to 9.
- the flow rate ratio of the first reaction product stream to the flow rate of the second reaction product stream could be controlled to 5 to 11.
- 'flow rate' may mean the flow of weight per unit time.
- the unit of the flow rate may be ton/hr.
- the first reaction product stream may be additionally condensed using a cooler and supplied to the absorption tower 100 as a gas-liquid mixed phase in which a gas phase and a liquid phase are mixed.
- the first reaction product stream is cooled while passing through one or more heat exchangers as described above, and the refrigerant used in the cooler can be replaced with inexpensive cooling water, and the amount of cooling water used can be minimized. have.
- the gas phase first reaction product stream contains 85% to 95% by weight of unreacted propylene monomer, 4% to 8% by weight of isopropyl alcohol, and 1% to 5% by weight of water.
- the first reaction product stream has a high content of unreacted propylene monomer and a low content of isopropyl alcohol and water.
- the liquid second reaction product stream may include 1% to 10% by weight of unreacted propylene monomer, 5% to 15% by weight of isopropyl alcohol, and 80% to 90% by weight of water.
- the second reaction product stream may have a small content of unreacted propylene monomer and a large content of water.
- the amount of isopropyl alcohol included in the second reaction product stream may be higher than the amount of isopropyl alcohol included in the first reaction product stream.
- the first reaction product stream of the partially condensed gas-liquid mixed phase and the second reaction product stream of the liquid phase are supplied to the lower side of the absorption tower 100 as individual streams or as a mixed stream. It can be.
- the total number of stages of the absorption tower 100 may be 10 to 30 stages, 15 to 30 stages, or 15 to 25 stages.
- the first reaction product and the second reaction product may be supplied to the 10 stages of the absorption tower 100.
- the reaction product is supplied to the absorption tower 100, and in the absorption tower 100, a bottom discharge stream containing isopropyl alcohol and an upper discharge stream containing unreacted propylene monomer are separated. can be separated
- the upper discharge stream of the absorption tower 100 may further include an inert gas together with unreacted propylene monomer
- the lower discharge stream may further include isopropyl alcohol and unreacted water.
- the reaction product may be supplied to the lower end of the absorption tower 100, and the isopropyl alcohol contained in the reaction product is dissolved using the solvent supplied to the absorption tower 100 to form the absorption tower 100. bottom, and a stream containing unreacted propylene monomer can be separated top.
- the solvent used in the absorption tower 100 may be, for example, water.
- water which is a component used in the reaction, as the solvent, a separate device for separating the solvent in the subsequent stage is not required.
- the flow rate of the solvent supplied to the absorption tower 100 may be 20% to 50%, 20% to 45%, or 25% to 40% of the total flow rate of the reaction products supplied to the absorption tower 100.
- the operating pressure of the absorption tower 100 is 20 kg/cm 2 g to 40 kg/cm 2 g, 25 kg/cm 2 g to 40 kg/cm 2 g, or 25 kg/cm 2 g. cm 2 g to 35 kg/cm 2 g, and the operating temperature may be 80 °C to 110 °C, 90 °C to 110 °C, or 90 °C to 100 °C.
- the bottom discharge stream of the absorption tower 100 may include a small amount of unreacted propylene monomer in addition to isopropyl alcohol and unreacted water.
- the content of unreacted propylene monomer contained in the bottom discharge stream of the absorption tower 100 may be 5 wt% or less or 3 wt% to 5 wt%.
- all or part of the bottom discharge stream containing isopropyl alcohol from the absorption tower 100 is supplied to the first gas purification column 200 to obtain unreacted propylene monomer contained in the bottom discharge stream of the absorption tower 100 is separated into a top draw stream, and a bottom draw stream containing isopropyl alcohol and unreacted water can be fed to the IPA purification section.
- the bottom discharge stream of the absorption tower 100 undergoes one or more, one to three or one to two flash drums before being supplied to the first gas purification column 200.
- the bottom discharge stream of the absorption tower 100 is formed by using the first flash drum 500 or the first flash drum 500 and the second flash drum 510. A portion of the stream may be fed to the first gas purification column 200.
- the absorption tower bottom discharge stream is supplied to the first flash drum, and in the first flash drum, the unreacted propylene monomer contained in the absorption tower bottom discharge stream is It can be separated into an upper discharge stream and fed to a first gas purification column, and a lower discharge stream can be fed to an IPA purification section.
- the bottom discharge stream of the absorption tower to the first flash drum Before supplying the bottom discharge stream of the absorption tower to the first flash drum, it may be reduced in pressure using a first valve and then supplied to the first flash drum, whereby the vapor phase and the liquid phase in the first flash drum 500 may be supplied. separation efficiency can be improved.
- the absorption tower bottom discharge stream is pre-separated through a first flash drum, and a part stream containing unreacted propylene monomer and inert gas is supplied to a first gas purification column, and a part stream containing isopropyl alcohol and unreacted water Silver can be supplied to the IPA purification section.
- the separation efficiency is improved by controlling the composition of the stream supplied to the second gas purification column, it is possible to prevent isopropyl alcohol from being discharged into the upper discharge stream of the second gas purification column.
- the contents of isopropyl alcohol and water in the stream supplied to the second gas purification column are reduced to 5% by weight or less, so that isopropyl alcohol is prevented from being discharged into the upper discharge stream of the second gas purification column.
- the bottom discharge stream of the absorption tower 100 is supplied to the first flash drum 500, and the unreacted water contained in the bottom discharge stream of the absorption tower 100 in the first flash drum 500 Propylene monomer may be separated as an overhead draw stream and fed to the second gas purification column 300 and a bottom draw stream fed to the second flash drum 510.
- the pressure Before supplying the lower discharge stream of the absorption tower 100 to the first flash drum 500, the pressure may be reduced using the first valve 600 and then supplied to the first flash drum 500. In addition, before supplying the lower discharge stream of the first flash drum 500 to the second flash drum 510, the pressure may be reduced using the second valve 610 and then supplied to the second flash drum 510. Through this, it is possible to improve the separation efficiency of the gas phase and the liquid phase in each of the first flash drum 500 and the second flash drum 510 .
- the bottom discharge stream containing isopropyl alcohol and unreacted water from the second flash drum 510 may be supplied to the IPA purification unit, and the top discharge stream including the remaining components may be supplied to the first gas purification column 200. .
- the bottom discharge stream of the absorption tower 100 is pre-separated using the first flash drum 500 and the second flash drum 510, and some streams containing unreacted propylene monomer and inert gas are transferred to the second gas purification column ( 300), and a partial stream containing isopropyl alcohol and unreacted water may be fed to the IPA purification section.
- the content of isopropyl alcohol and water in the stream supplied to the second gas purification column 300 is reduced to 5% by weight or less, thereby increasing the separation efficiency of the second gas purification column 300, thereby increasing the inert gas removal column 400
- isopropyl alcohol By preventing isopropyl alcohol from being included in the stream supplied to the inert gas removal column 400, unreacted propylene monomer that does not contain isopropyl alcohol is recovered with high purity and can be refluxed and reused in the reactor.
- the gas phase and the liquid phase are separated after depressurizing the bottom discharge stream of the absorption tower 100 and before being supplied to the downstream column. It is possible to prevent a problem in which the size of a column has to be inefficiently increased for gas-liquid separation in the downstream column, and the separation efficiency of the second gas purification column 300 can be improved.
- the flow ratio of the first flash drum 500 top discharge stream and the second flash drum 510 top discharge stream is 1:0.4 to 1:0.8, 1:0.5 to 1:0.8, or It may be 1:0.5 to 1:0.7.
- the operating temperature in the first flash drum 500 may be 80 °C to 100 °C, 85 °C to 100 °C, or 85 °C to 95 °C.
- the operating pressure in the first flash drum 500 is 10 kg/cm 2 g to 25 kg/cm 2 g, 15 kg/cm 2 g to 25 kg/cm 2 g, or 15 kg/cm 2 g to 20 kg/cm 2 g.
- An operating temperature of the second flash drum 510 may be 80 °C to 95 °C, 85 °C to 95 °C, or 85 °C to 90 °C.
- the operating pressure in the second flash drum 510 is 0 kg/cm 2 g to 2 kg/cm 2 g, 0 kg/cm 2 g to 1 kg/cm 2 g, or 0 kg/cm 2 g to 0.5 kg/cm 2 g. Separation efficiency may be improved when operating conditions in the second flash drum 510 are controlled within the above range.
- an upper discharge stream containing unreacted propylene monomer and a lower discharge stream containing isopropyl alcohol may be separated.
- the upper discharge stream of the first gas purification column 200 may further include an inert gas together with unreacted propylene monomer
- the lower discharge stream may further include isopropyl alcohol and unreacted water.
- the top discharge stream containing unreacted propylene monomer in the first gas purification column 200 is supplied to the second gas purification column 300, and the bottom discharge stream containing isopropyl alcohol is supplied to the IPA purification unit.
- the operating pressure of the first gas purification column 200 is 0 kg/cm 2 g to 2 kg/cm 2 g, 0 kg/cm 2 g to 1 kg/cm 2 g, or 0 kg/cm 2 g to 0.5 kg. / cm 2 g, and the operating temperature may be 40 °C to 80 °C, 50 °C to 80 °C or 50 °C to 70 °C.
- the streams supplied to the second gas purification column 300 may be supplied as individual streams or may be supplied to the second gas purification column 300 as a mixed stream.
- a portion of the absorber 100 overhead stream and the first gas purification column 200 overhead stream may form a mixed stream and be fed to the second gas purification column 300, in some cases.
- a portion of the absorber (100) top off stream, the first gas purification column (200) top off stream, and the first flash drum (500) top off stream form a mixed stream to the second gas purification column (300). can be supplied.
- the second gas purification column 300 separates the top discharge stream containing unreacted propylene monomer from the supplied stream and supplies it to the inert gas removal column 400, isopropyl alcohol and a bottom discharge stream containing water may be separated and supplied to the IPA purification unit. At this time, the entire amount of isopropyl alcohol and unreacted water in the stream supplied to the second gas purification column 300 may be separated into the lower discharge stream. In this case, isopropyl alcohol and unreacted water are not included in the upper discharge stream of the second gas purification column 300 supplied to the inert gas removal column 400, and are recovered in the inert gas removal column 400. Unreacted propylene monomer returned to the reactor may not contain isopropyl alcohol.
- the operating pressure of the second gas purification column 300 is 12 kg / cm 2 g to 20 kg / cm 2 g, 15 kg / cm 2 g to 20 kg / cm 2 g, or It may be 15 kg/cm 2 g to 17 kg/cm 2 g, and the operating temperature may be 30 °C to 170 °C, 40 °C to 170 °C, or 40 °C to 160 °C.
- the total number of stages of the second gas purification column 300 may be 25 to 40, 28 to 40, or 28 to 35.
- the supply stage of the stream supplied to the second gas purification column 300 may be 40% to 55%, 43% to 55%, or 45% to 53% of the total number of stages of the second gas purification column 300. have.
- the streams supplied to the second gas purification column 300 are from stages 12 to 16 of the second gas purification column 300.
- the inert gas removal column 400 separates the top discharge stream containing unreacted propylene monomer from the feed stream and returns it to the reactor so that it can be reused. At this time, isopropyl alcohol may not exist in the upper discharge stream of the inert gas removal column 400.
- the upper discharge stream of the inert gas removal column 400 is a gaseous stream, and by separating and removing inert gas, for example, ethane, to prevent inert gas from accumulating in the process to obtain high purity It is possible to increase the production of isopropyl alcohol even without using the propylene monomer of Specifically, in the isopropyl alcohol production process performed by gas phase reaction, some of the inert gas may be included in the propylene monomer introduced as a reactant.
- inert gas for example, ethane
- the inert gas may include, for example, at least one selected from the group consisting of hydrocarbons having 2 to 3 carbon atoms, and as a specific example, the inert gas may include at least one selected from the group consisting of ethane and propane.
- the gaseous component containing the inert gas in the upper discharge stream of the inert gas removal column 400 is purged to separate and remove some or all of the inert gas, thereby reducing the content of the inert gas in the stream refluxed to the reactor. It has the effect of lowering the inert gas to prevent accumulation in the process.
- the lower discharge stream of the inert gas removal column 400 is a liquid stream containing an inert gas, for example, propane, which is depressurized by passing through the third valve 620 and then a gas-liquid separation device. 700, the gas-liquid separator 700 separates the inert gas upward, and can be purged and removed like the gaseous component in the upper discharge stream of the inert gas removal column 400. At this time, isopropyl alcohol and unreacted water do not exist in the discharge stream at the bottom of the inert gas removal column 400, so there may be no stream discharged at the bottom of the gas-liquid separation device 700.
- an inert gas for example, propane
- the operating pressure of the inert gas removal column 400 is 15 kg / cm 2 g to 25 kg / cm 2 g, 18 kg / cm 2 g to 25 kg / cm 2 g or 18 It may be kg/cm 2 g to 20 kg/cm 2 g, and the operating temperature may be 30 °C to 70 °C, 40 °C to 70 °C, or 40 °C to 60 °C.
- the total number of stages of the inert gas removal column 400 may be 65 to 80, 65 to 78, or 67 to 75.
- the feed stage of the stream supplied to the inert gas removal column 400 is 50% or less, 1% to 50%, 5% to 45%, or 10% to 45% of the total number of stages of the inert gas removal column 400 can be
- the stream supplied to the inert gas removal column 400 may be supplied to 35 stages or less of the inert gas removal column 400. . In this way, by controlling the total number of stages of the inert gas removal column 400 and the supply stage of the stream supplied to the inert gas removal column 400, unreacted propylene monomer can be separated with high purity.
- the ratio of the total number of stages of the second gas purification column 300 and the inert gas removal column 400 is 1:1.5 to 1:5, 1:2 to 1:4, or 1:2 to 1:3.
- the composition of the upper discharge stream and the lower discharge stream of the second gas purification column 300 is controlled and at the same time inert
- the inclusion of isopropyl alcohol in the off-gas column 400 overhead stream can be avoided.
- the stream supplied to the IPA purification unit may include isopropyl alcohol, unreacted water, and water used as a solvent, and high-purity isopropyl alcohol from which water is removed in the IPA purification unit may be separated.
- the water separated in the IPA purification unit can be supplied to the reactor and reused.
- impurities such as propylene monomer or isopropyl alcohol
- Control of the molar ratio of water can be facilitated.
- devices such as a distillation column, a condenser, a reboiler, a valve, a pump, a separator, and a mixer may be additionally installed and used.
- the feed stream is supplied at a flow rate of 10 ton / hr to a reactor operated at a pressure of 40 kg / cm 2 g and a temperature of 192 ° C to 208 ° C, and propylene monomer (PP) in the feed stream is compared to water (H
- the molar ratio of 2 O) was controlled to 0.4, and ethane and propane were included as inert gases.
- the gaseous reaction product stream discharged from the reactor is separated into a gaseous first reaction product stream and a liquid second reaction product stream while passing through two heat exchangers, and the first reaction product stream is partially liquid in a cooler. After condensing to , it is supplied to the 20th stage of the absorption tower (100), and the second reaction product stream is supplied to the 20th stage of the absorption tower (100). At this time, the total number of stages of the absorption tower 100 was 20 stages.
- the absorption tower 100 is operated at a temperature of 96 °C to 98 °C and a pressure of 31.2 kg / cm 2 g to 31.6 kg / cm 2 g, using water supplied as a solvent to the top of the absorption tower 100 Isopropyl alcohol in the reaction product stream is absorbed and separated into a top draw stream containing propylene monomer and a bottom draw stream containing water and isopropyl alcohol.
- a portion of the upper discharge stream of the absorption tower 100 was supplied to the second gas purification column 300, the remaining stream was refluxed to the reactor, and the lower discharge stream was supplied to the first valve 600. After depressurization, it was supplied to the first flash drum 500. At this time, the operating pressure of the first flash drum 500 was operated at 16.8 kg/cm 2 g, and the flow rate of the upper discharge stream was controlled at 0.2 ton/hr.
- the lower discharge stream from the first flash drum 500 is depressurized using the second valve 610 and supplied to the second flash drum 510, and the upper discharge stream from the second flash drum 510 is It was fed to the first gas purification column 200 and the bottom discharge stream was fed to the IPA purification section.
- the operating pressure of the second flash drum 510 was operated at 0.2 kg/cm 2 g, and the flow rate of the upper discharge stream was controlled at 0.1 ton/hr.
- the bottom discharge stream from the first gas purification column 200 was supplied to the IPA purification unit. At this time, the total number of stages of the first gas purification column 200 was 4, the operating temperature was controlled to 57 ° C to 64 ° C, and the operating pressure was controlled to 0.15 kg / cm 2 g to 0.2 kg / cm 2 g.
- a portion of the absorption tower (100) overhead stream, the first gas purification column (200) overhead stream, and the first flash drum (500) overhead stream form a mixed stream to form a second gas purification column (300). Supplied in 16 stages. At this time, the total number of stages of the second gas purification column 300 was 32, the operating temperature was controlled to 41 ° C to 160 ° C, and the operating pressure was controlled to 16.50 kg / cm 2 g to 16.52 kg / cm 2 g. In the second gas purification column 300, the top discharge stream was supplied to the 26th stage of the inert gas removal column 400, and the bottom discharge stream was supplied to the IPA purification unit. At this time, the total number of stages of the inert gas removal column 400 was 70 stages.
- the inert gas removal column 400 is operated at a temperature of 47 ° C to 55 ° C and a pressure of 19.10 kg / cm 2 g to 19.59 kg / cm 2 g, and unreacted propylene monomer is separated as an upper discharge stream and returned to the reactor. and reused.
- IPA content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor (2) PP content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor and (3) supplied to the IPA purification unit. It is shown in Table 1 below for the PP content in the stream to be.
- the feed stream is supplied at a flow rate of 10 ton / hr to a reactor operated at a pressure of 40 kg / cm 2 g and a temperature of 192 ° C to 208 ° C, and propylene monomer (PP) in the feed stream is compared to water (H
- the molar ratio of 2 O) was controlled to 0.4, and ethane and propane were included as inert gases.
- the gaseous reaction product stream discharged from the reactor is separated into a gaseous first reaction product stream and a liquid second reaction product stream while passing through two heat exchangers, and the first reaction product stream is partially liquid in a cooler. After condensing to , it is supplied to the 20th stage of the absorption tower (100), and the second reaction product stream is supplied to the 20th stage of the absorption tower (100). At this time, the total number of stages of the absorption tower 100 was 20 stages.
- the absorption tower 100 is operated at a temperature of 96 °C to 98 °C and a pressure of 31.2 kg / cm 2 g to 31.6 kg / cm 2 g, using water supplied as a solvent to the top of the absorption tower 100 Isopropyl alcohol in the reaction product stream is absorbed and separated into a top draw stream containing propylene monomer and a bottom draw stream containing water and isopropyl alcohol.
- a portion of the upper discharge stream of the absorption tower 100 was supplied to the second gas purification column 300, the remaining stream was refluxed to the reactor, and the lower discharge stream was supplied to the first valve 600. After depressurization, it was supplied to the first flash drum 500. At this time, the operating pressure of the first flash drum 500 was operated at 16.8 kg/cm 2 g, and the flow rate of the upper discharge stream was controlled at 0.2 ton/hr.
- the lower discharge stream from the first flash drum 500 is depressurized using the second valve 610 and then supplied to the second flash drum 510, and the upper discharge stream from the second flash drum 510 is It was fed to the first gas purification column 200 and the bottom discharge stream was fed to the IPA purification section.
- the operating pressure of the second flash drum 510 was operated at 0.2 kg/cm 2 g, and the flow rate of the upper discharge stream was controlled at 0.1 ton/hr.
- the bottom discharge stream from the first gas purification column 200 was supplied to the IPA purification unit. At this time, the total number of stages of the first gas purification column 200 was 4, the operating temperature was controlled to 57 ° C to 64 ° C, and the operating pressure was controlled to 0.15 kg / cm 2 g to 0.2 kg / cm 2 g.
- a portion of the absorption tower (100) overhead stream, the first gas purification column (200) overhead stream, and the first flash drum (500) overhead stream form a mixed stream to form a second gas purification column (300). Supplied in 16 stages. At this time, the total number of stages of the second gas purification column 300 was 32, the operating temperature was controlled to 41 ° C to 160 ° C, and the operating pressure was controlled to 16.50 kg / cm 2 g to 16.52 kg / cm 2 g. In the second gas purification column 300, the top discharge stream was supplied to stage 26 of the inert gas removal column 400, and the bottom discharge stream was supplied to the IPA purification unit. At this time, the total number of stages of the inert gas removal column 400 was 70 stages.
- the inert gas removal column 400 is operated at a temperature of 47 ° C to 55 ° C and a pressure of 19.10 kg / cm 2 g to 19.59 kg / cm 2 g, and the top discharge stream of liquid components containing unreacted propylene monomer is It was refluxed into the reactor and reused.
- gaseous components including inert gas in the upper discharge stream of the inert gas removal column 400 are purged and removed, and the lower discharge stream is reduced in pressure by passing through the third valve 620, and then the gas-liquid separation device 700 ), and the inert gas was separated and removed upward in the gas-liquid separator 700.
- IPA content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor (2) PP content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor and (3) supplied to the IPA purification unit. It is shown in Table 1 below for the PP content in the stream to be.
- Example 2 isopropyl alcohol was prepared in the same manner as in Example 2, except that the upper discharge stream of the second gas purification column 300 was supplied to the 7th stage of the inert gas removal column 400. .
- IPA content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor (2) PP content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor and (3) supplied to the IPA purification unit. It is shown in Table 1 below for the PP content in the stream to be.
- Example 2 isopropyl alcohol was produced in the same manner as in Example 2, except that the mixed stream was supplied to the fourth stage of the second gas purification column 300.
- IPA content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor (2) PP content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor and (3) supplied to the IPA purification unit. It is shown in Table 1 below for the PP content in the stream to be.
- Example 2 isopropyl alcohol was prepared in the same manner as in Example 2, except that the mixed stream was supplied to stage 30 of the second gas purification column 300.
- IPA content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor (2) PP content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor and (3) supplied to the IPA purification unit. It is shown in Table 1 below for the PP content in the stream to be.
- Example 2 isopropyl alcohol was prepared in the same manner as in Example 2, except that the upper discharge stream of the second gas purification column 300 was supplied to the 38th stage of the inert gas removal column 400. did
- IPA content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor (2) PP content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor and (3) supplied to the IPA purification unit. It is shown in Table 1 below for the PP content in the stream to be.
- Example 2 the mixed stream is supplied to stage 30 of the second gas purification column 300, and the upper discharge stream of the second gas purification column 300 is supplied to stage 38 of the inert gas removal column 400.
- Isopropyl alcohol was prepared in the same manner as in Example 2, except that it was supplied as.
- IPA content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor (2) PP content in the upper discharge stream of the inert gas removal column 400 refluxed to the reactor and (3) supplied to the IPA purification unit. It is shown in Table 1 below for the PP content in the stream to be.
- the feed stream is supplied at a flow rate of 10 ton / hr to a reactor operated at a pressure of 40 kg / cm 2 g and a temperature of 192 ° C to 208 ° C, and propylene monomer (PP) in the feed stream is compared to water (H
- the molar ratio of 2 O) was controlled to 0.4, and ethane and propane were included as inert gases.
- the reaction product stream discharged from the reactor was supplied to the 20th stage of the absorption tower (100). At this time, the total number of stages of the absorption tower 100 was 20 stages.
- the absorption tower 100 is operated at a temperature of 96 °C to 98 °C and a pressure of 31.2 kg / cm 2 g to 31.6 kg / cm 2 g, using water supplied as a solvent to the top of the absorption tower 100 Isopropyl alcohol in the reaction product stream is absorbed and separated into a top draw stream containing propylene monomer and a bottom draw stream containing water and isopropyl alcohol. Specifically, a portion of the top off stream of the absorption tower 100 was fed to the gas purification column 310, the remaining stream was refluxed to the reactor, and the bottom off stream was fed to the flash drum 520.
- the top off stream containing unreacted propylene monomer was refluxed to the reactor, and the bottom off stream was fed to the IPA purification section.
- the total number of stages of the gas purification column 310 was 32, the operating temperature was controlled to 41 ° C to 160 ° C, and the operating pressure was controlled to 16.50 kg / cm 2 g to 16.52 kg / cm 2 g.
- the top discharge stream containing gaseous unreacted propylene monomer was refluxed to the reactor, and the bottom discharge stream was supplied to the IPA purification unit.
- the operating pressure of the flash drum was operated at 16.8 kg/cm 2 g, and the flow rate of the upper discharge stream was controlled at 0.2 ton/hr.
- Example comparative example One 2 3 4 5 6 7 One (1) (% by weight) 0 0 0 0 0 0 0 0 3.5 (2) (% by weight) 94.9 94.9 95.1 94.9 94.8 94.8 94.7 83.2 (3) (% by weight) 0.006 0.006 0.006 0.009 0.014 0.006 0.014 0.4
- At least one of the feed stage through which the mixed stream is supplied to the second gas purification column 300 and the feed stage of the stream supplied to the inert gas removal column 400 is within the range according to the present invention. , it was confirmed that the separation efficiency was somewhat lowered due to the lack of a rectifying section for separating the high boiling point material to the lower part or the lack of a stripping section for separating the low boiling point material to the upper part.
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Abstract
Description
실시예 | 비교예 | |||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 1 | |
(1)(중량%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3.5 |
(2)(중량%) | 94.9 | 94.9 | 95.1 | 94.9 | 94.8 | 94.8 | 94.7 | 83.2 |
(3)(중량%) | 0.006 | 0.006 | 0.006 | 0.009 | 0.014 | 0.006 | 0.014 | 0.4 |
Claims (11)
- 반응기에서 프로필렌 단량체 및 물을 반응시킨 반응 생성물 스트림을 흡수탑으로 공급하는 단계;상기 흡수탑에서 이소프로필 알코올을 포함하는 하부 배출 스트림을 제1 가스 정제 컬럼으로 공급하고, 미반응 프로필렌 단량체를 포함하는 상부 배출 스트림의 일부 스트림은 제2 가스 정제 컬럼으로 공급하고, 나머지 스트림은 상기 반응기로 환류시키는 단계;상기 제1 가스 정제 컬럼에서 미반응 프로필렌 단량체를 포함하는 상부 배출 스트림을 제2 가스 정제 컬럼으로 공급하고, 이소프로필 알코올을 포함하는 하부 배출 스트림은 IPA 정제부로 공급하는 단계;상기 제2 가스 정제 컬럼에서 미반응 프로필렌 단량체를 포함하는 상부 배출 스트림을 비활성 기체 제거 컬럼으로 공급하고, 이소프로필 알코올을 포함하는 하부 배출 스트림은 IPA 정제부로 공급하는 단계; 및상기 비활성 기체 제거 컬럼에서 미반응 프로필렌 단량체를 포함하는 상부 배출 스트림을 반응기로 환류시키는 단계를 포함하는 이소프로필 알코올 제조방법.
- 제1항에 있어서,상기 흡수탑의 하부 배출 스트림은 제1 플래시 드럼으로 공급하여, 상기 제1 플래시 드럼의 상부 배출 스트림은 상기 제2 가스 정제 컬럼으로 공급하고, 하부 배출 스트림은 제2 플래시 드럼으로 공급하며,상기 제2 플래시 드럼의 상부 배출 스트림은 상기 제1 가스 정제 컬럼으로 공급하고, 하부 배출 스트림은 IPA 정제부로 공급하는 이소프로필 알코올 제조방법.
- 제2항에 있어서,상기 흡수탑의 하부 배출 스트림은 제1 밸브를 이용하여 감압시킨 후 상기 제1 플래시 드럼으로 공급하고,상기 제1 플래시 드럼의 하부 배출 스트림은 제2 밸브를 이용하여 감압시킨 후 상기 제2 플래시 드럼으로 공급하는 이소프로필 알코올 제조방법.
- 제2항에 있어서,상기 제1 플래시 드럼의 상부 배출 스트림 및 제2 플래시 드럼의 상부 배출 스트림의 유량비는 1:0.2 내지 1:0.8인 이소프로필 알코올 제조방법.
- 제1항에 있어서,상기 비활성 기체 제거 컬럼의 상부 배출 스트림과 상기 비활성 기체 제거 컬럼의 하부 배출 스트림으로부터 비활성 기체를 분리하는 이소프로필 알코올 제조방법.
- 제1항에 있어서,상기 반응 생성물 스트림은 1기 이상의 열교환기를 이용하여 제1 반응 생성물 스트림과 제2 반응 생성물 스트림으로 분리되고, 상기 제1 반응 생성물 스트림과 제2 반응 생성물 스트림은 흡수탑에 공급되는 이소프로필 알코올 제조방법.
- 제1항에 있어서,상기 제2 가스 정제 컬럼의 전체 단수는 25단 내지 40단이고,상기 제2 가스 정제 컬럼으로 공급되는 스트림의 공급단은 상기 제2 가스 정제 컬럼의 전체 단수의 40% 내지 55%의 단인 이소프로필 알코올 제조방법.
- 제1항에 있어서,상기 제2 가스 정제 컬럼의 운전 압력은 12 kg/cm2g 내지 20 kg/cm2g이고, 운전 온도는 30 ℃ 내지 170 ℃인 이소프로필 알코올 제조방법.
- 제1항에 있어서,상기 비활성 기체 제거 컬럼의 전체 단수는 65단 내지 80단이고,상기 비활성 기체 제거 컬럼으로 공급되는 스트림의 공급단은 상기 비활성 기체 제거 컬럼의 전체 단수의 50%의 단 이하인 이소프로필 알코올 제조방법.
- 제1항에 있어서,상기 비활성 기체 제거 컬럼의 운전 압력은 15 kg/cm2g 내지 25 kg/cm2g이고, 운전 온도는 30 ℃ 내지 70 ℃인 이소프로필 알코올 제조방법.
- 제1항에 있어서,상기 제2 가스 정제 컬럼 및 비활성 기체 제거 컬럼의 전체 단수 비율은 1:1.2 내지 1:5인 이소프로필 알코올 제조방법.
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CN202180011927.3A CN115697950B (zh) | 2021-05-31 | 2021-12-05 | 用于制备异丙醇的方法 |
JP2022540969A JP7354493B2 (ja) | 2021-05-31 | 2021-12-05 | イソプロピルアルコールの製造方法 |
EP21908087.6A EP4122908B1 (en) | 2021-05-31 | 2021-12-05 | Method for preparing isopropyl alcohol |
CA3164721A CA3164721A1 (en) | 2021-05-31 | 2021-12-05 | Method for preraring isopropyl alcohol |
US17/791,561 US20240174585A1 (en) | 2021-05-31 | 2021-12-05 | Method for preparing isopropyl alcohol |
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EP4122908B1 (en) | 2024-02-07 |
KR20220161915A (ko) | 2022-12-07 |
EP4122908A1 (en) | 2023-01-25 |
KR102673698B1 (ko) | 2024-06-07 |
US20240174585A1 (en) | 2024-05-30 |
CN115697950B (zh) | 2024-04-12 |
EP4122908A4 (en) | 2023-08-23 |
CA3164721A1 (en) | 2022-12-08 |
JP2023532828A (ja) | 2023-08-01 |
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