WO2020252553A1 - Process and system for vent recovery from the production of hydroxypropyl methylcellulose (hpmc) - Google Patents

Process and system for vent recovery from the production of hydroxypropyl methylcellulose (hpmc) Download PDF

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Publication number
WO2020252553A1
WO2020252553A1 PCT/BR2020/050220 BR2020050220W WO2020252553A1 WO 2020252553 A1 WO2020252553 A1 WO 2020252553A1 BR 2020050220 W BR2020050220 W BR 2020050220W WO 2020252553 A1 WO2020252553 A1 WO 2020252553A1
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Prior art keywords
alcohol
hpmc
water
production
fact
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PCT/BR2020/050220
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French (fr)
Portuguese (pt)
Inventor
Antonio Fernando ALMEIDA
Alípio José GUSMÃO DOS SANTOS
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Formitex Da Bahia Indústria E Comércio S.A.
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Priority to BR112021025867A priority Critical patent/BR112021025867A2/en
Publication of WO2020252553A1 publication Critical patent/WO2020252553A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1418—Recovery of products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1487—Removing organic compounds

Definitions

  • the present invention relates to a process and a system for recovering vents from the production of hydroxypropyl methylcellulose (HPMC).
  • HPMC hydroxypropyl methylcellulose
  • HPMC is a polymer derived from cellulose with high wetting capacity and high hydration speed, it is widely used in several applications, such as: coating agent; stabilizer, suspender, or viscosity; binder; humidifying agent, among others.
  • the present invention presents a lower cost and environmental impacts to the process of recovering wind from the production of HPMC when compared to that already revealed by the state of the art.
  • the present invention promotes the recovery of contaminants from the various vent currents of the HPMC production process, ensuring that atmospheric emissions present a loss level close to zero and that it presents only the inert gases purged into the atmosphere (basically N2). Thus, the present invention promotes the complete integration of process streams.
  • Fluid Phase Equilibria 43: 29-44; and Coats, RA, Mullins, JC and Thies, MC, 1991. Fluid phase equilibria for the methyl chloride-water system. Fluid Phase Equilibria, 65: 327-338.
  • the present invention is directed, among other aspects, to the solution of the integration of the process currents of the industrial production of HPMC.
  • the present invention presents favorable aspects associated with the risk to health and the environment, due to the technological process of low emissions.
  • the present invention relates to a process and a system for recovering vents from the industrial production of HPMC that comprises an absorber system, and a process of cooling at low temperature and removal of the chemicals, the said recovered chemicals being subsequently treated for reuse in the HPMC industrial production process.
  • the present invention provides a system for recovering vents from HPMC production which comprises an absorber system.
  • the said absorber system features cooling at low temperature and removal of chemicals, and the recovered chemicals are subsequently treated for reuse in the production process.
  • the present invention provides a process to recover vents from the industrial production of HPMC, and the said process comprises the steps of:
  • said alcohol being preferably methanol.
  • the present invention consists of a system and a process for recovering vents from the production of HPMC, and the referred process begins with the collection of vents from the HPMC production plant, that is, the vents of the alcohol tanks, methyl chloride (MeCI) and propylene oxide (PO) storage vessels, reaction area condensers, purges and the online analysis system of the HPMC reactor and washing area vessels, all of these systems are aligned and directed to the “Vent Gas Collection Header”, which is a “manifold”, which feeds the vent header washing column (C-6050).
  • the water-soluble gas absorption column operates with a water circulation at the bottom, through the G-6052 pump and the heat exchanger (E-6051), with about 30 m 3 / h and returning to the column at a temperature between 2 to 18 ° C.
  • the bottom is kept at a temperature between 2 to 18 ° C.
  • the top is fed with the “make-up” of fresh cold water, at a temperature between 2 and 18 o C.
  • the gas stream is fed at the bottom.
  • the purpose of the water-soluble gas absorption column is to absorb dimethyl ether (DME), alcohol and PO, which is extracted at the bottom and aligned into a lung vessel (C-6055) and then recycled to the water tank. process condensate from the HPMC plant.
  • the top header of the vent header wash column (C-6050) is rich in inert and methyl chloride (MeCI) and, therefore, the slaughter of MeCI, which has no affinity for water, is done in a second vents recovery section.
  • the top chain of the first absorber feeds the bottom of the second absorber (MeCI wash column (C-6060)).
  • alcohol preferably methanol
  • a heat exchanger E-6063
  • it is cooled to a temperature between 2 to 18 ° C and, then, at the top of the absorber, whose purpose is to absorb the methyl chloride that is extracted in the bottom stream.
  • the absorption column for gases not absorbed in water operates with a water circulation at the bottom, through a pump (G-6062) and heat exchanger (E-6061), with about 30 m 3 / h and returning for the column at a temperature between 2 to 18 ° C.
  • the bottom is kept at a temperature between 2 to 18 ° C, and through a pump (G-6066) it is transferred to the alcohol rectification column (C-964) or directly to the process alcohol tank (D-806 ).
  • the top stream of the MeCI washing column (C-6060) is basically composed of inert materials, containing a trace contaminant residue, which falls under environmental legislation and therefore follows the ventilation chimney. (“Vent stack”).
  • the process revealed by the present invention recovers the wind current of industrial production of HPMC in an economically viable way and in order to promote the integration of the process currents, and the raw materials used are: alcohol, preferably , methanol and process water for industrial HPMC production; and, the products and by-products generated are:
  • said aqueous solution comprising 0 to 5% by weight of PO, 0 to 5% by weight of DME; about 10 to 30% by weight of alcohol; and balance of the total weight of water.
  • the present invention also provides unexpected and differentiated technical effects compared to the existing technique, particularly when integrated with processes and systems of (i) industrial production of HPMC, (ii) production of methyl chloride by hydrochlorination integrated with a conversion reactor of DME, and that DME comes from the by-product of the industrial HPMC production process, and / or (iii) recovery of waste water from washing the suspension generated in the HPMC production process.
  • Figure 1 - is a diagram of the process of recovering the wind from the production of Hydroxypropyl methylcellulose (HPMC), in which the equipment described above is identified.
  • HPMC Hydroxypropyl methylcellulose
  • Figure 1 is a complementary proof of the characteristics of the present process.
  • Figure 1 is a complementary proof of the characteristics of the present process.
  • a preferred embodiment of said process and / or system is exemplified below.
  • vents of the HPMC industrial plant are collected, that is, the vents of the alcohol tanks, of the methyl chloride (MeCI) and Propylene oxide (PO) storage vessels, of the reaction area condensers , purges and the online analysis system of the HPMC reactor and the wash area vessels.
  • MeCI methyl chloride
  • PO Propylene oxide
  • the water-soluble gas absorption column operates with a water circulation at the bottom, and returning to the column at a temperature between 2 to 18 ° C.
  • the bottom is kept at a temperature between 2 to 18 ° C.
  • the make-up of fresh cold water is fed from the top, at a temperature between 2 to 18 ° C.
  • alcohol preferably methanol
  • a heat exchanger E-6063
  • it is cooled to a temperature between 2 to 18 ° C and, then, at the top of the absorber, whose purpose is to absorb the methyl chloride that is extracted in the bottom stream.
  • the column for absorbing gases not absorbed in water operates with a water circulation at the bottom, and returning to the column at a temperature between 2 to 18 ° C.
  • the bottom is kept at a temperature between 2 to 18 ° C, and is transferred to the alcohol rectification column (C-964) or directly to the process alcohol tank (D-806).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The present invention relates to a system for vent recovery from the industrial production of HPMC that comprises a system of absorbers, with low-temperature cooling and removal of the chemicals, said recovered chemicals being subsequently treated for reuse in the production process, and a process for vent recovery from the industrial production of HPMC, said process comprising the steps of (a) absorbing the water-soluble gases from the vent stream from the HPMC processes, with low-temperature water; (b) cooling the aqueous solution rich in the absorbed components; (c) absorbing the unabsorbed gases in alcohol from the vent stream that has passed through the first absorber, with low-temperature alcohol; (d) cooling the alcohol solution rich in the absorbed components; (e) scrubbing the unabsorbed gases with low-temperature water to remove the residual alcohol; and (f) recovering the absorbed components for reuse in the HPMC production process.

Description

Relatório Descritivo da Patente de Invenção para Invention Patent Specification Report for
PROCESSO E SISTEMA DE RECUPERAÇÃO DE VENTS DA PRODUÇÃO DE HIDROXIPROPIL METILCELULOSE (HPMC)VENTS RECOVERY PROCESS AND SYSTEM FROM THE PRODUCTION OF HYDROXYPROPYL METHYLCELLULOSE (HPMC)
CAMPO DA INVENÇÃO FIELD OF THE INVENTION
[001 ] A presente invenção se refere a um processo e um sistema de recuperação de vents da produção de hidroxipropil metilcelulose (HPMC). [001] The present invention relates to a process and a system for recovering vents from the production of hydroxypropyl methylcellulose (HPMC).
[002] O HPMC é um polímero derivado da celulose com alta capacidade de molhagem e alta velocidade de hidratação, é utilizado amplamente em diversas aplicações, tais como: agente de revestimento; estabilizante, suspensor, ou de viscosidade; aglutinante; agente umidificante, dentre outras. [002] HPMC is a polymer derived from cellulose with high wetting capacity and high hydration speed, it is widely used in several applications, such as: coating agent; stabilizer, suspender, or viscosity; binder; humidifying agent, among others.
ANTECEDENTES DA INVENÇÃO BACKGROUND OF THE INVENTION
[003] O destino usual das correntes de vents produzidas na produção de HPMC é a incineração, o que representa perdas de matérias-primas, custo operacional e geração de gases residual. [003] The usual destination of wind currents produced in the production of HPMC is incineration, which represents losses of raw materials, operating costs and waste gas generation.
[004] Assim, esta prática não assegura que as emissões atmosféricas apresentem um nível de perdas próximo de zero, tampouco que as referidas emissões apresentem apenas os gases inertes purgados à atmosfera (praticamente N2), como alcançado pela presente invenção. [004] Thus, this practice does not guarantee that the atmospheric emissions present a loss level close to zero, nor that the referred emissions present only the inert gases purged to the atmosphere (practically N2), as achieved by the present invention.
[005] Ainda, a presente invenção apresenta um menor custo e impactos ambientais ao processo de recuperação de vents da produção de HPMC quando comparado ao já revelado pelo estado da técnica. [005] Still, the present invention presents a lower cost and environmental impacts to the process of recovering wind from the production of HPMC when compared to that already revealed by the state of the art.
[006] A presente invenção promove a recuperação dos contaminantes das diversas correntes de vent do processo de produção de HPMC, assegurando que as emissões atmosféricas apresentem um nível de perdas próximo de zero e, que apresente apenas os gases inertes purgados para a atmosfera (basicamente N2). Assim, a presente invenção promove a completa integração das correntes de processo. [007] Os estudos e pesquisas desenvolvidos pelos inventores da presente invenção com relação à absorção desses gases em água e em metanol utilizaram como base, por exemplo, o revelado em Holldorff, H. and Knapp, H., 1988. Vapour-liquid equilibria of the binary mixtures methyl chloride-methanol and dimethyl ether-methyl chloride and of the ternary mixture dimethyl ether-methyl chloride-methanol. Fluid Phase Equilibria, 43: 29-44; e Coats, R.A., Mullins, J.C. and Thies, M.C., 1991. Fluid phase equilibria for the methyl chloride-water system. Fluid Phase Equilibria, 65: 327-338. [006] The present invention promotes the recovery of contaminants from the various vent currents of the HPMC production process, ensuring that atmospheric emissions present a loss level close to zero and that it presents only the inert gases purged into the atmosphere (basically N2). Thus, the present invention promotes the complete integration of process streams. [007] The studies and research carried out by the inventors of the present invention with respect to the absorption of these gases in water and methanol used as a basis, for example, that disclosed in Holldorff, H. and Knapp, H., 1988. Vapor-liquid equilibria of the binary mixtures methyl chloride-methanol and dimethyl ether-methyl chloride and of the ternary mixture dimethyl ether-methyl chloride-methanol. Fluid Phase Equilibria, 43: 29-44; and Coats, RA, Mullins, JC and Thies, MC, 1991. Fluid phase equilibria for the methyl chloride-water system. Fluid Phase Equilibria, 65: 327-338.
[008] Surpreendentemente, o processo revelado pelo presente pedido de patente promove a completa integração das correntes de processo, da produção de HPMC, maximizando o rendimento, e evitando perdas. [008] Surprisingly, the process revealed by the present patent application promotes the complete integration of the process streams, the production of HPMC, maximizing the yield, and avoiding losses.
[009] Assim, várias correntes de gases que seriam destinadas à incineração são tratadas com recuperação dos componentes. [009] Thus, several gas streams that would be destined for incineration are treated with component recovery.
[0010] Além disso, a presente invenção é direcionada, dentre outros aspectos, à solução da integração das correntes de processo da produção industrial de HPMC. [0010] In addition, the present invention is directed, among other aspects, to the solution of the integration of the process currents of the industrial production of HPMC.
[001 1 ] Adicionalmente, a presente invenção apresenta aspectos favoráveis associados ao risco à saúde e ao meio ambiente, devido ao processo tecnológico de baixas emissões. [001 1] Additionally, the present invention presents favorable aspects associated with the risk to health and the environment, due to the technological process of low emissions.
SUMÁRIO DA INVENÇÃO SUMMARY OF THE INVENTION
[0012] A presente invenção se refere a um processo e um sistema de recuperação de vents da produção industrial de HPMC que compreende um sistema de absorvedoras, e um processo de resfriamento a baixa temperatura e remoção dos químicos, sendo que os referidos químicos recuperados são posteriormente tratados para reuso no processo produtivo industrial de HPMC. [0012] The present invention relates to a process and a system for recovering vents from the industrial production of HPMC that comprises an absorber system, and a process of cooling at low temperature and removal of the chemicals, the said recovered chemicals being subsequently treated for reuse in the HPMC industrial production process.
OBJETIVOS DA INVENÇÃO OBJECTIVES OF THE INVENTION
[0013] É um dos objetivos da presente invenção proporcionar uma rota de processo de produção de HPMC integrado. É um processo de recuperação dos componentes das correntes de vents, com reaproveitamento integrado na Planta industrial de HPMC. [0013] It is one of the objectives of the present invention to provide a integrated HPMC production process route. It is a process of recovering the components of the wind vents, with reuse integrated in the HPMC Industrial Plant.
[0014] É também objetivo da presente invenção recuperar a corrente de vents da produção de HPMC de maneira economicamente viável e de forma a promover a integração das correntes de processo, de acordo com os balanços de massa do processo. [0014] It is also the objective of the present invention to recover the wind current of HPMC production in an economically viable way and in order to promote the integration of the process currents, according to the process mass balances.
[0015] É um outro objetivo da presente invenção maximizar o rendimento de matérias-primas e, consequentemente, reduzir o custo de produção do HPMC. [0015] It is another objective of the present invention to maximize the yield of raw materials and, consequently, to reduce the production cost of the HPMC.
DESCRIÇÃO DAS CONCRETIZAÇÕES DA INVENÇÃO DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION
[0016] A presente invenção proporciona um sistema de recuperação de vents da produção de HPMC que compreende um sistema de absorvedoras. [0016] The present invention provides a system for recovering vents from HPMC production which comprises an absorber system.
[0017] O referido sistema de absorvedoras apresenta resfriamento a baixa temperatura e remoção dos químicos, sendo que os químicos recuperados são posteriormente tratados para reuso no processo produtivo. [0017] The said absorber system features cooling at low temperature and removal of chemicals, and the recovered chemicals are subsequently treated for reuse in the production process.
[0018] Ainda, a presente invenção proporciona um processo para recuperar vents da produção industrial de HPMC, e sendo que o referido processo compreende as etapas de: [0018] Still, the present invention provides a process to recover vents from the industrial production of HPMC, and the said process comprises the steps of:
(a) absorção dos gases solúveis em água da corrente de vents dos processos de HPMC, com água a baixa temperatura; (a) absorption of water-soluble gases from the wind stream of HPMC processes, with water at low temperature;
(b) resfriamento da solução aquosa rica nos componentes absorvidos; (b) cooling the aqueous solution rich in the absorbed components;
(c) absorção dos gases não absorvidos em álcoois da corrente de vents que passou pela primeira absorvedora, álcool a baixa temperatura; (c) absorption of gases not absorbed in alcohols from the vents that passed through the first absorber, alcohol at low temperature;
(d) resfriamento da solução de álcool rica nos componentes absorvidos; (e) lavagem dos gases não absorvidos com água a baixa temperatura para remoção do álcool residual; e (d) cooling the alcohol solution rich in the absorbed components; (e) washing of gases not absorbed with water at low temperature to remove residual alcohol; and
(f) recuperação dos componentes absorvidos para reuso no processo de produção de HPMC, (f) recovery of components absorbed for reuse in the HPMC production process,
sendo que o referido álcool é, preferencialmente, metanol. said alcohol being preferably methanol.
[0019] Dessa forma, a presente invenção consiste em um sistema e um processo de recuperação de vents da produção de HPMC, sendo que o referido processo se inicia com a coleta dos vents da planta de produção de HPMC, ou seja, os respiros dos tanques de álcool, dos vasos de estocagem de cloreto de metila (MeCI) e óxido de Propileno (PO), dos condensadores da área de reação, das purgas e do sistema de análise online do reator de HPMC e dos vasos da área de lavagem, sendo que todos os referidos sistemas são alinhados e direcionados para o“Vent Gas Collection Header”, que é um“manifold”, que alimenta a coluna de lavagem de vent header (C-6050). [0019] Thus, the present invention consists of a system and a process for recovering vents from the production of HPMC, and the referred process begins with the collection of vents from the HPMC production plant, that is, the vents of the alcohol tanks, methyl chloride (MeCI) and propylene oxide (PO) storage vessels, reaction area condensers, purges and the online analysis system of the HPMC reactor and washing area vessels, all of these systems are aligned and directed to the “Vent Gas Collection Header”, which is a “manifold”, which feeds the vent header washing column (C-6050).
[0020] A coluna de absorção de gases solúveis em água opera com uma circulação de água no fundo, através da bomba G-6052 e o trocador de calor (E-6051 ), com cerca de 30 m3/h e retornando para a coluna na temperatura entre 2 a 18°C. [0020] The water-soluble gas absorption column operates with a water circulation at the bottom, through the G-6052 pump and the heat exchanger (E-6051), with about 30 m 3 / h and returning to the column at a temperature between 2 to 18 ° C.
[0021 ] O fundo é mantido na temperatura entre 2 a 18°C. Pelo topo é alimentado o “make-up” de água gelada fresca, a cerca de na temperatura entre 2 a 18o C. A corrente de gases é alimentada no fundo. O objetivo da coluna de absorção de gases solúveis em água é absorver o dimetil éter (DME), álcool e PO, que é extraído no fundo e alinhado para um vaso pulmão (C-6055) e, a seguir, reciclado para o tanque de condensado de processo da planta de HPMC. [0021] The bottom is kept at a temperature between 2 to 18 ° C. The top is fed with the “make-up” of fresh cold water, at a temperature between 2 and 18 o C. The gas stream is fed at the bottom. The purpose of the water-soluble gas absorption column is to absorb dimethyl ether (DME), alcohol and PO, which is extracted at the bottom and aligned into a lung vessel (C-6055) and then recycled to the water tank. process condensate from the HPMC plant.
[0022] A corrente de topo da coluna de lavagem de vent header (C- 6050) é rica em inertes e cloreto de metila (MeCI) e, portanto, o abatimento do MeCI, que não apresenta afinidade com água, é feito numa segunda seção de recuperação de vents. [0023] A corrente topo da primeira absorvedora alimenta o fundo da segunda absorvedora (coluna de lavagem de MeCI (C-6060)). [0022] The top header of the vent header wash column (C-6050) is rich in inert and methyl chloride (MeCI) and, therefore, the slaughter of MeCI, which has no affinity for water, is done in a second vents recovery section. [0023] The top chain of the first absorber feeds the bottom of the second absorber (MeCI wash column (C-6060)).
[0024] Assim, alimenta-se álcool, preferencialmente, metanol advindo da estocagem de álcool, em um trocador de calor (E-6063), onde é resfriado para a temperatura entre 2 a 18° C e, a seguir, no topo da absorvedora, cujo objetivo é absorver o cloreto de metila que é extraído na corrente de fundo. [0024] Thus, alcohol, preferably methanol, is fed from the storage of alcohol, in a heat exchanger (E-6063), where it is cooled to a temperature between 2 to 18 ° C and, then, at the top of the absorber, whose purpose is to absorb the methyl chloride that is extracted in the bottom stream.
[0025] A coluna de absorção de gases não absorvidos em água opera com uma circulação de água no fundo, através de uma bomba (G-6062) e trocador de calor (E-6061 ), com cerca de 30 m3/h e retornando para a coluna na temperatura entre 2 a 18°C. O fundo é mantido à temperatura entre 2 a 18°C, e através de uma bomba (G- 6066) é transferido para a coluna de retificação de álcool (C-964) ou diretamente para o tanque de álcool de processo (D-806). [0025] The absorption column for gases not absorbed in water operates with a water circulation at the bottom, through a pump (G-6062) and heat exchanger (E-6061), with about 30 m 3 / h and returning for the column at a temperature between 2 to 18 ° C. The bottom is kept at a temperature between 2 to 18 ° C, and through a pump (G-6066) it is transferred to the alcohol rectification column (C-964) or directly to the process alcohol tank (D-806 ).
[0026] A corrente de topo da coluna de lavagem de MeCI (C-6060) é basicamente composta por inertes, contendo um residual de contaminantes, a nível de traços, que se enquadra na legislação ambiental e, portanto, segue à chaminé de ventilação (“vent stack”). [0026] The top stream of the MeCI washing column (C-6060) is basically composed of inert materials, containing a trace contaminant residue, which falls under environmental legislation and therefore follows the ventilation chimney. (“Vent stack”).
[0027] Dessa forma, o processo revelado pela presente invenção recupera a corrente de vents da produção industrial de HPMC de maneira economicamente viável e de forma a promover a integração das correntes de processo, sendo que as matérias-primas utilizadas são: álcool, preferencialmente, metanol e água de processo da produção industrial de HPMC; e, os produtos e subprodutos gerados são: [0027] Thus, the process revealed by the present invention recovers the wind current of industrial production of HPMC in an economically viable way and in order to promote the integration of the process currents, and the raw materials used are: alcohol, preferably , methanol and process water for industrial HPMC production; and, the products and by-products generated are:
(i) uma mistura de álcool com MeCI, destinado à recuperação do álcool (C-964) ou diretamente para o tanque de álcool de processo (D-806); e (i) a mixture of alcohol with MeCI, intended for the recovery of alcohol (C-964) or directly to the process alcohol tank (D-806); and
(ii) uma solução aquosa compreendendo PO, DME, e álcool, sendo que a referida água é enviada ao tanque de condensado, que será utilizado no processo de lavagem do processo de HPMC. (ii) an aqueous solution comprising PO, DME, and alcohol, the said water being sent to the condensate tank, which will be used in the washing process of the HPMC process.
[0028] Ademais, as características técnicas dos produtos obtidos pelo processo revelado pela presente invenção são: [0028] In addition, the technical characteristics of the products obtained by the process disclosed by the present invention are:
(i) a referida mistura de álcool com MeCI compreendendo cerca de menos do que 5% em peso de MeCI; traços de água; e balanço do total em peso de álcool; e (i) said mixture of alcohol with MeCI comprising about less than 5% by weight of MeCI; traces of water; and balance of the total alcohol by weight; and
(ii) a referida solução aquosa compreendendo 0 a 5% em peso de PO, 0 a 5% em peso de DME; cerca de 10 a 30% em peso de álcool; e balanço do total em peso de água. (ii) said aqueous solution comprising 0 to 5% by weight of PO, 0 to 5% by weight of DME; about 10 to 30% by weight of alcohol; and balance of the total weight of water.
[0029] A presente invenção proporciona ainda efeitos técnicos inesperados e diferenciados diante da técnica existente, particularmente quando integrada a processos e sistemas de (i) produção industrial de HPMC, (ii) produção de cloreto de metila por hidrocloração integrada a um reator de conversão de DME, sendo que o referido DME é proveniente do subproduto do processo industrial de produção de HPMC, e/ou (iii) recuperação de efluentes de água residual de lavagem da suspensão gerada no processo de produção de HPMC. [0029] The present invention also provides unexpected and differentiated technical effects compared to the existing technique, particularly when integrated with processes and systems of (i) industrial production of HPMC, (ii) production of methyl chloride by hydrochlorination integrated with a conversion reactor of DME, and that DME comes from the by-product of the industrial HPMC production process, and / or (iii) recovery of waste water from washing the suspension generated in the HPMC production process.
DESCRIÇÃO DO DESENHO DESCRIPTION OF THE DRAWING
[0030] A presente invenção será, a seguir, mais detalhadamente descrita. A Figura mostra: [0030] The present invention will be described in more detail below. The Figure shows:
[0031 ] Figura 1 - é um diagrama do processo de recuperação de vents da produção de Hidroxipropil metilcelulose (HPMC), no qual são identificados os equipamentos descritos acima. [0031] Figure 1 - is a diagram of the process of recovering the wind from the production of Hydroxypropyl methylcellulose (HPMC), in which the equipment described above is identified.
EXEMPLOS EXAMPLES
[0032] A caracterização de várias concretizações preferidas da presente invenção é descrita no exemplo a seguir, sendo demonstrado os efeitos desenvolvidos pela presente invenção. [0032] The characterization of several preferred embodiments of the present invention is described in the following example, the effects developed by the present invention being demonstrated.
[0033] Através da Figura 1 é identificado em detalhes o processo revelado pela presente invenção. Dessa forma, a Figura 1 é uma comprovação complementar das características do presente processo. [0034] Ainda, é exemplificado, a seguir, uma concretização preferencial do referido processo e/ou sistema. [0033] Through Figure 1, the process revealed by the present invention is identified in detail. Thus, Figure 1 is a complementary proof of the characteristics of the present process. [0034] In addition, a preferred embodiment of said process and / or system is exemplified below.
[0035] É realizada a coleta dos vents da planta industrial de HPMC, ou seja, os respiros dos tanques de álcool, dos vasos de estocagem de cloreto de metila (MeCI) e óxido de Propileno (PO), dos condensadores da área de reação, das purgas e do sistema de análise online do reator de HPMC e dos vasos da área de lavagem. [0035] The vents of the HPMC industrial plant are collected, that is, the vents of the alcohol tanks, of the methyl chloride (MeCI) and Propylene oxide (PO) storage vessels, of the reaction area condensers , purges and the online analysis system of the HPMC reactor and the wash area vessels.
[0036] A coluna de absorção de gases solúveis em água opera com uma circulação de água no fundo, e retornando para a coluna na temperatura entre 2 a 18°C. O fundo é mantido na temperatura entre 2 a 18°C. Pelo topo é alimentado o“make-up” de água gelada fresca, à temperatura entre 2 a 18°C. [0036] The water-soluble gas absorption column operates with a water circulation at the bottom, and returning to the column at a temperature between 2 to 18 ° C. The bottom is kept at a temperature between 2 to 18 ° C. The make-up of fresh cold water is fed from the top, at a temperature between 2 to 18 ° C.
[0037] A corrente topo da primeira absorvedora alimenta o fundo da segunda absorvedora (coluna de lavagem de MeCI (C-6060)). [0037] The top chain of the first absorber feeds the bottom of the second absorber (MeCI wash column (C-6060)).
[0038] Assim, alimenta-se álcool, preferencialmente, metanol, advindo da estocagem de álcool, em um trocador de calor (E-6063), onde é resfriado à temperatura entre 2 a 18°C e, a seguir, no topo da absorvedora, cujo objetivo é absorver o cloreto de metila que é extraído na corrente de fundo. [0038] Thus, alcohol, preferably methanol, is fed, resulting from the storage of alcohol, in a heat exchanger (E-6063), where it is cooled to a temperature between 2 to 18 ° C and, then, at the top of the absorber, whose purpose is to absorb the methyl chloride that is extracted in the bottom stream.
[0039] A coluna de absorção de gases não absorvidos em água opera com uma circulação de água no fundo, e retornando para a coluna na temperatura entre 2 a 18°C. O fundo é mantido à temperatura entre 2 a 18°C, e é transferido para a coluna de retificação de álcool (C-964) ou diretamente para o tanque de álcool de processo (D-806). [0039] The column for absorbing gases not absorbed in water operates with a water circulation at the bottom, and returning to the column at a temperature between 2 to 18 ° C. The bottom is kept at a temperature between 2 to 18 ° C, and is transferred to the alcohol rectification column (C-964) or directly to the process alcohol tank (D-806).
[0040] Assim, as características técnicas dos produtos obtidos pelo processo e/ou sistema revelado pela referida concretização preferencial são: [0040] Thus, the technical characteristics of the products obtained by the process and / or system revealed by said preferential embodiment are:
(i) mistura de álcool com MeCI compreendendo cerca de 0 a 5% em peso de MeCI; traços de água; e balanço do total em peso de álcool; e (ii) solução aquosa compreendendo cerca de 0 a 5% em peso de PO, 0 a 5% em peso de DME; cerca de 10 a 30% em peso de álcool; e balanço do total em peso de água. (i) mixing alcohol with MeCI comprising about 0 to 5% by weight of MeCI; traces of water; and balance of the total alcohol by weight; and (ii) aqueous solution comprising about 0 to 5% by weight of PO, 0 to 5% by weight of DME; about 10 to 30% by weight of alcohol; and balance of the total weight of water.
[0041] As características das concretizações na presente invenção podem ser combinadas com as características de outras concretizações aqui reveladas. [0041] The characteristics of the embodiments in the present invention can be combined with the characteristics of other embodiments disclosed herein.
[0042] Tendo sido descrito exemplos de concretizações preferidas, deve ser entendido que o escopo da presente invenção abrange outras possíveis variações, sendo limitado tão somente pelo teor das reivindicações apensas, incluídos os possíveis equivalentes. [0042] Having described examples of preferred embodiments, it should be understood that the scope of the present invention covers other possible variations, being limited only by the content of the appended claims, including possible equivalents.

Claims

REIVINDICAÇÕES
1. Processo para recuperar vents da produção industrial de hidroxipropil metilcelulose (HPMC), caracterizado pelo fato de que compreende as etapas de: 1. Process to recover vents from the industrial production of hydroxypropyl methylcellulose (HPMC), characterized by the fact that it comprises the steps of:
(a) absorver os gases solúveis em água da corrente de vents dos processos de HPMC, com água a baixa temperatura; (a) absorb the water-soluble gases from the wind stream of the HPMC processes, with water at low temperature;
(b) resfriar a solução aquosa rica nos componentes absorvidos; (b) cooling the aqueous solution rich in the absorbed components;
(c) absorver os gases não absorvidos em álcoois da corrente de vents que passou pela primeira absorvedora, álcool a baixa temperatura; (c) absorb the gases not absorbed in alcohols from the vents that passed through the first absorber, alcohol at low temperature;
(d) resfriar a solução de álcool rica nos componentes absorvidos; (d) cooling the alcohol solution rich in the absorbed components;
(e) lavar os gases não absorvidos com água a baixa temperatura para remoção do álcool residual; e (e) washing unabsorbed gases with water at low temperature to remove residual alcohol; and
(f) recuperar os componentes absorvidos para reuso no processo de produção de HPMC. (f) recover the components absorbed for reuse in the HPMC production process.
2. Processo, de acordo com a reivindicação 1 , caracterizado pelo fato de que o referido álcool é, preferencialmente, metanol. 2. Process according to claim 1, characterized by the fact that said alcohol is preferably methanol.
3. Processo, de acordo com a reivindicação 1 ou 2, caracterizado pelo fato de que a corrente de gases solúveis em água compreende água de processo da produção de HPMC. 3. Process according to claim 1 or 2, characterized by the fact that the water-soluble gas stream comprises process water from the HPMC production.
4. Sistema, caracterizado pelo fato de que é um sistema de absorvedoras para recuperar a corrente de vents da produção industrial de HPMC. 4. System, characterized by the fact that it is an absorber system to recover the wind current from industrial HPMC production.
5. Sistema, de acordo com a reivindicação 4, caracterizado pelo fato de que compreende 5. System, according to claim 4, characterized by the fact that it comprises
pelo menos uma absorvedora de gases solúveis em água que absorve dimetil éter (DME), álcool e óxido de Propileno (PO); e pelo menos uma absorvedora de gases não absorvidos em água que absorve MeCI. at least one water-soluble gas absorber that absorbs dimethyl ether (DME), alcohol and Propylene oxide (PO); and at least one absorber of unabsorbed gases in water that absorbs MeCI.
6. Sistema, de acordo com a reivindicação 4 ou 5, caracterizado pelo fato de que o referido álcool é, preferencialmente, metanol. 6. System according to claim 4 or 5, characterized by the fact that said alcohol is preferably methanol.
7. Processo, de acordo com qualquer uma das reivindicações 1 a 3, ou sistema, de acordo com qualquer uma das reivindicações 4 a 6, caracterizado pelo fato de que produz: 7. Process according to any one of claims 1 to 3, or system according to any one of claims 4 to 6, characterized by the fact that it produces:
(i) uma mistura de álcool com MeCI; e (i) a mixture of alcohol with MeCI; and
(ii) uma solução aquosa compreendendo PO, DME, e álcool. (ii) an aqueous solution comprising PO, DME, and alcohol.
8. Processo, de acordo com qualquer uma das reivindicações 1 a 3 e 7, ou sistema, de acordo com qualquer uma das reivindicações 4 a 7, caracterizado pelo fato de que: Process according to any one of claims 1 to 3 and 7, or system according to any one of claims 4 to 7, characterized by the fact that:
(i) a mistura de álcool com MeCI compreende cerca de menos do que 5% em peso de MeCI; traços de água; e balanço do total em peso de álcool; e (i) the mixture of alcohol with MeCI comprises about less than 5% by weight of MeCI; traces of water; and balance of the total alcohol by weight; and
(ii) a referida solução aquosa compreende cerca de 0 a 5% em peso de PO, 0 a 5% em peso de DME; cerca de 10 a 30% em peso de álcool; e balanço do total em peso de água. (ii) said aqueous solution comprises about 0 to 5% by weight of PO, 0 to 5% by weight of DME; about 10 to 30% by weight of alcohol; and balance of the total weight of water.
PCT/BR2020/050220 2019-06-19 2020-06-19 Process and system for vent recovery from the production of hydroxypropyl methylcellulose (hpmc) WO2020252553A1 (en)

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CN205031917U (en) * 2015-08-31 2016-02-17 扬州中福生物技术有限公司 A DME recovery unit for in HPMC production
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CN1651388A (en) * 2004-02-04 2005-08-10 上海吴泾化工有限公司 Recovery method of tail gas light component in carbonylation production of acetic acid lanhydride
EP1983004A1 (en) * 2007-04-20 2008-10-22 Shin-Etsu Chemical Co., Ltd. Hydroxyalkyl methylcellulose having solubility and thermoreversible gelation properties improved
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