WO2020252554A1 - Processo e sistema para produzir cloreto de metila por hidrocloração integrado a um reator de conversão de dimetil éter - Google Patents
Processo e sistema para produzir cloreto de metila por hidrocloração integrado a um reator de conversão de dimetil éter Download PDFInfo
- Publication number
- WO2020252554A1 WO2020252554A1 PCT/BR2020/050221 BR2020050221W WO2020252554A1 WO 2020252554 A1 WO2020252554 A1 WO 2020252554A1 BR 2020050221 W BR2020050221 W BR 2020050221W WO 2020252554 A1 WO2020252554 A1 WO 2020252554A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dme
- meci
- hci
- reactor
- methyl chloride
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/093—Preparation of halogenated hydrocarbons by replacement by halogens
- C07C17/18—Preparation of halogenated hydrocarbons by replacement by halogens of oxygen atoms of carbonyl groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/361—Preparation of halogenated hydrocarbons by reactions involving a decrease in the number of carbon atoms
- C07C17/363—Preparation of halogenated hydrocarbons by reactions involving a decrease in the number of carbon atoms by elimination of carboxyl groups
Definitions
- the present invention relates to a process and system for producing methyl chloride (MeCI) by hydrochlorination integrated with a dimethyl ether (DME) conversion reactor, said DME coming from the by-product of the industrial process production of hydroxypropyl methylcellulose (HPMC).
- MeCI methyl chloride
- HPMC hydroxypropyl methylcellulose
- incineration has been used as the main destination of the DME chain, from the by-product of the industrial HPMC production process.
- This practice can present, for example, high cost and environmental impacts to the HPMC production process, if there is no demand for the generated DME by-product.
- the present invention provides an economically viable solution to reduce the cost of HPMC production, with the maximization of MeCI production and elimination of the generation of a by-product.
- the process and / or system disclosed by the present invention integrates the process of hydrochlorination of methanol, which produces a mixture of hydrochloric acid (HCI), and methyl chloride (MeCI) which, after drying and separation, results in Pure MeCI and a current of HCI dry gas.
- HCI hydrochloric acid
- MeCI methyl chloride
- the dry HCI from it is used in the conversion reactor from DME (by-product of HPMC production) to MeCI with the HPMC production process.
- Methyl chloride is a raw material in the production of HPMC.
- the present invention is directed, among other aspects, to the solution of the elimination of a by-product, which has commercialization limitations.
- the present invention presents favorable aspects associated with the risk to health and the environment, due to the gain of eliminating the transport, and storage of a very volatile, medium toxic, and flammable chemical.
- the present invention relates to a system and / or industrial process for the production of methyl chloride by hydrochlorination integrated with a DME conversion reactor, the said DME coming from the by-product of the industrial process of production of HPMC.
- the present invention provides a system for producing MeCI by hydrochlorination integrated with a DME conversion reactor, the DME coming from the by-product of the industrial process HPMC production system, and the said system comprises:
- the present invention provides a process for producing MeCI by hydrochlorination integrated with a DME conversion reactor, the DME coming from the by-product of the industrial HPMC production process, and the said process comprises the steps in:
- Methanol from methanol storage is fed into a mixing tee.
- the current of HCI 28 to 35%, resulting from the storage of HCI 28 to 35% is heated by the HCI current of 10 to 20% resulting from the drying process of MeCI and, then, it is also fed to the mixing tee, thus resulting in a current at a temperature between 80 to 120 ° C, which is then discharged into the MeCI reactor.
- the mixture MeCI: HCI: water is obtained.
- the operating pressure of the MeCI reactor is maintained at a pressure between 950 to 1 100 kPa, and at a temperature between 90 to 130 ° C, sufficient to maintain HCI, and water as a liquid hydrochloric acid, allowing separation of the methyl chloride of the reaction mixture.
- the overflow of the MeCI reactor feeds a rectifying column (“stripping”), where all light that is solubilized is removed in the liquid (MeCI, DME and HCI) at the top, and the water formed in the reaction removed in the bottom stream as a 10 to 20% HCI solution.
- a rectifying column (“stripping”), where all light that is solubilized is removed in the liquid (MeCI, DME and HCI) at the top, and the water formed in the reaction removed in the bottom stream as a 10 to 20% HCI solution.
- the methyl chloride stripping uses a thermal heating fluid in the reflector, aiming to maintain the column bottom temperature between 180 to 220 ° C.
- the bottom level of the column is controlled by the bottom withdrawal.
- This current passes through the cooler / heater and is then sent by pressure differential to the HCI tank of 10 to 20% (operating at atmospheric pressure).
- the excess dry DME: HCI mixture is heated to about 190 to 220 ° C, and feeds a fixed catalytic bed reactor, in which the DME reacts with the HCI, forming the mixture of H2O, unreacted HCI and MeCI, which is then fed to the MeCI reactor.
- This reflux also promotes the reaction between 0 DME and 0 HCI and forms methyl chloride and water.
- the HCI forms a maximum boiling point azeotrope with 0 water vapor in this column.
- the water is drawn down as a liquid and thus the product is dried.
- the top stream of the column is cooled in the primary condenser, and the condensate is recycled to the column as a reflux stream.
- the non-condensing current is cooled in the secondary condenser, at low temperature, condensing all 0 MeCI and HCI, which will be the load for the MeCI distillation column.
- the MeCI product is removed from the bottom of the column and sent to the MeCI tank.
- the non-condensers from the secondary condenser are sent to the “vents” treatment unit, aiming at recovering the residual HCI and MeCI.
- the process and / or system disclosed by this invention reduces the production costs of HPMC, with the improvement of the production of MeCI for HPMC through the process of production of methyl chloride by hydrochlorination integrated to a DME conversion reactor.
- said methyl chloride has a HCI concentration of less than 10 ppm (0.001%), a water concentration in ppbs (traces), and said methyl chloride has water solubility, vol. gas / vol (20 ° C) of about 2.2; the density (20/4 ° C) from 0.9 to 0.93; and a vapor pressure between 300 to 400 kPa and a practically pure product;
- said hydrochloric acid has a HCI concentration of 10 to 20% in water; and a concentration of MeCI, MeOH and DME in ppbs (traces), with HCI from 10 to 20% being reconcentrated in the HCI absorption unit to 33% and returning to the process as a raw material.
- the present invention also provides unexpected and differentiated technical effects compared to the existing technique, particularly when integrated with processes and systems for (i) industrial HPMC production, (ii) recovery of vents from industrial HPMC production, and / or (iii) recovery of wastewater from the washing of the suspen are generated in the production process of HPMC.
- Figure 1 - is a diagram of the process and / or production system of methyl chloride by hydrochlorination integrated with a DME conversion reactor, in which a MeCL reactor, a DME reactor, condensation and purification of MeCI.
- Figure 1 the process disclosed by the present invention is identified in detail.
- Figure 1 is one with a complementary test of the characteristics of the present process.
- the HCI stream with a concentration between 28 to 35% is heated by the HCI stream of 10 to 20% resulting from the drying process of the MeCI and, then, it is also fed to the mixing Té, resulting, thus, in a current at a temperature between 80 to 120 ° C, which is then discharged into the MeCI reactor. In this way, the mixture MeCI: HCI: water is obtained.
- the operating pressure of the MeCI reactor is maintained at a pressure between 950 to 1 100 kPa, and at a temperature between 80 to 120 ° C.
- the overflow from the MeCI reactor feeds a rectifying column (“stripping”), where all light that is solubilized is removed in the liquid (MeCI, DME and HCI) at the top, and the water formed in the reaction removed in the bottom stream as a 10 to 20% HCI solution.
- a rectifying column (“stripping”), where all light that is solubilized is removed in the liquid (MeCI, DME and HCI) at the top, and the water formed in the reaction removed in the bottom stream as a 10 to 20% HCI solution.
- the methyl chloride stripping uses a thermal heating fluid in the reflector, in order to maintain the bottom temperature of the column at about 180 to 230 ° C.
- This current passes through the cooler / heater and is then sent by pressure differential to the HCI tank of 10 to 20% (operating at atmospheric pressure).
- the excess dry DME: HCI mixture is heated to about 180 to 230 ° C, and feeds a fixed catalytic bed reactor, in which the DME reacts with the HCI, forming the mixture of H2O, unreacted HCI and MeCI, which is then fed to the MeCI reactor.
- the mixture of hydrochloric acid and MeCI in the MeCI reactor feeds the drying column connected directly from the top of the reactor.
- a stream of MeCI condensate goes countercurrent as a reflux, promoting the drying of the MeCI: HCI mixture, presenting the temperature control in the column bed to ensure the complete removal of the water.
- This reflux also promotes the reaction between 0 DME and 0 HCI and forms methyl chloride and water.
- the HCI forms a maximum boiling point azeotrope with 0 water vapor in this column.
- the water is drawn down as a liquid and thus the product is dried.
- the non-condensing current is cooled in the secondary condenser, at low temperature, condensing all 0 MeCI and HCI, which will be the load for the MeCI distillation column.
- the MeCI product is removed from the bottom of the column and sent to the MeCI tank.
- methyl chloride has an HCI concentration below 10 ppm (0.001%), a water concentration in ppbs (dashes),
- said methyl chloride having solubility in water, vol. gas / vol (20 ° C) around 2.2; a density (20/4 ° C) of 0.9 to 0.93; and a vapor pressure between 300 to 400 kPa (3.79 bar (g)) and a practically pure product;
- hydrochloric acid has an HCI concentration of about 10 to 20% in water; and a concentration of MeCI, MeOH and DME in ppbs (traces), with HCI from 10 to 20% being reconcentrated in the HCI absorption unit to 33% and returning to the process as a raw material.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112021025874A BR112021025874A2 (pt) | 2019-06-19 | 2020-06-19 | Processo e sistema para produzir cloreto de metila por hidrocloração integrado a um reator de conversão de dimetil éter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR102019012766-0A BR102019012766A2 (pt) | 2019-06-19 | 2019-06-19 | processo e sistema para produzir cloreto de metila por hidrocloração integrado a um reator de conversão de dimetil éter |
BRBR102019012766-0 | 2019-06-19 |
Publications (1)
Publication Number | Publication Date |
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WO2020252554A1 true WO2020252554A1 (pt) | 2020-12-24 |
Family
ID=74036901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR2020/050221 WO2020252554A1 (pt) | 2019-06-19 | 2020-06-19 | Processo e sistema para produzir cloreto de metila por hidrocloração integrado a um reator de conversão de dimetil éter |
Country Status (3)
Country | Link |
---|---|
AR (1) | AR119211A1 (pt) |
BR (2) | BR102019012766A2 (pt) |
WO (1) | WO2020252554A1 (pt) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3981938A (en) * | 1974-07-08 | 1976-09-21 | The Dow Chemical Company | Method for producing dry alkyl halides |
JPS56127324A (en) * | 1980-03-10 | 1981-10-06 | Shin Etsu Chem Co Ltd | Preparation of methyl chloride |
US4794204A (en) * | 1986-06-14 | 1988-12-27 | Hoechst Aktiengesellschaft | Process for the removal of dimethyl ether in methyl chloride |
EP0323840A1 (de) * | 1988-01-05 | 1989-07-12 | Wacker-Chemie GmbH | Spaltung von Dimethyläther |
US4922043A (en) * | 1988-12-02 | 1990-05-01 | Vulcan Materials Company | Manufacture of methyl chloride by hydrochlorinating methanol, using a split methanol feed |
US5843286A (en) * | 1996-06-25 | 1998-12-01 | Hoechst Aktiengesellschaft | Process for the preparation and fractionation of a mixture of dimethyl ether and chloromethane with water as extractant |
CN109206291A (zh) * | 2017-07-04 | 2019-01-15 | 天津中福泰克化工科技有限公司 | 一种氯甲烷-二甲醚的分离方法 |
-
2019
- 2019-06-19 BR BR102019012766-0A patent/BR102019012766A2/pt not_active Application Discontinuation
-
2020
- 2020-06-19 BR BR112021025874A patent/BR112021025874A2/pt unknown
- 2020-06-19 WO PCT/BR2020/050221 patent/WO2020252554A1/pt active Application Filing
- 2020-06-19 AR ARP200101750A patent/AR119211A1/es unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3981938A (en) * | 1974-07-08 | 1976-09-21 | The Dow Chemical Company | Method for producing dry alkyl halides |
JPS56127324A (en) * | 1980-03-10 | 1981-10-06 | Shin Etsu Chem Co Ltd | Preparation of methyl chloride |
US4794204A (en) * | 1986-06-14 | 1988-12-27 | Hoechst Aktiengesellschaft | Process for the removal of dimethyl ether in methyl chloride |
EP0323840A1 (de) * | 1988-01-05 | 1989-07-12 | Wacker-Chemie GmbH | Spaltung von Dimethyläther |
US4922043A (en) * | 1988-12-02 | 1990-05-01 | Vulcan Materials Company | Manufacture of methyl chloride by hydrochlorinating methanol, using a split methanol feed |
US5843286A (en) * | 1996-06-25 | 1998-12-01 | Hoechst Aktiengesellschaft | Process for the preparation and fractionation of a mixture of dimethyl ether and chloromethane with water as extractant |
CN109206291A (zh) * | 2017-07-04 | 2019-01-15 | 天津中福泰克化工科技有限公司 | 一种氯甲烷-二甲醚的分离方法 |
Also Published As
Publication number | Publication date |
---|---|
BR112021025874A2 (pt) | 2023-03-14 |
AR119211A1 (es) | 2021-12-01 |
BR102019012766A2 (pt) | 2020-12-29 |
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