24 results about "Glycol dehydration" patented technology

The invention discloses a refining device and method for a polymerization product and application. The refining device comprises an aldehyde removal tower, a dehydration tower, a water separation tank, a light component removal tower, a byproduct tower and a product tower. According to the present invention, the reaction product obtained through the ethylene glycol dehydration condensation reaction contains water, acetaldehyde, diethylene glycol, 1, 4-dioxane, 2-methyldioxocyclopentane and other components, and has characteristics of complex components and coexistence of multiple azeotropic pairs, and the invention provides the sequential rectification method by introducing the azeotropic breaking component according to the composition, therefore, a diethylene glycol product with high purity and byproducts of acetaldehyde and 1, 4-dioxane are separated, the process is continuous and easy to operate, and the method has industrial feasibility.

The invention relates to the technical field of dehydration and regeneration methods of water-containing ethylene glycol rich liquor, in particular to an ethylene glycol dehydration and regeneration process and device adopting azeotropic distillation, in the ethylene glycol dehydration and regeneration process adopting azeotropic distillation, fuel gas is adopted as an entrainer of ethylene glycol rich liquor water, so that the boiling point of azeotrope in an ethylene glycol reboiler is reduced. Compared with an existing conventional ethylene glycol rich solution distillation regeneration process, under the condition that the same ethylene glycol barren solution regeneration concentration is achieved, the regeneration temperature is reduced by at least 30 DEG C, heating through a low-frequency electromagnetic heater can be achieved, and heating is safer and more reliable compared with heating through a traditional resistance heater; the regeneration energy consumption is reduced by about 10%, no regeneration tail gas is discharged, the VOCs discharge amount is zero, and the method has the advantage of environmental protection.

The invention discloses an ethylene glycol pre-dehydration tower device and a use method thereof, and belongs to the technical field of ethylene glycol dehydration. The ethylene glycol pre-dehydration tower is characterized in that a fog pad, a spraying device, a first elastic tower tray, a second elastic tower tray, a third elastic tower tray and a fourth elastic tower tray are mounted in the ethylene glycol pre-dehydration tower from top to bottom, and the first elastic tower tray, the second elastic tower tray, the third elastic tower tray and the fourth elastic tower tray are the same in structure; the elastic tray is provided with a float valve as a vapor-liquid outlet channel, the float valve automatically adjusts the opening degree according to the change of vapor-liquid flow, the elastic tray is also provided with a downcomer used for draining liquid of the upper tray to the lower tray, and condensate of the upper tray is drained to the lower tray to be contacted and mixed with a gas phase; the technical problems that an ethylene glycol pre-dehydration tower is low in operation flexibility and poor in pre-dehydration effect are solved, and the method is mainly applied to ethylene glycol pre-dehydration.

The utility model relates to the technical field of ethylene glycol dehydration, in particular to a dehydration mechanism which comprises a dehydration device, a dehydration tower shell and an outlet, the right end of the dehydration device is fixedly connected with the dehydration tower shell, the right end of the outer side of the dehydration tower shell is fixedly connected with the outlet, and the left end of the inner side of the outlet is fixedly connected with dust isolation cotton. The inner side of the lower end of the dehydrating tower shell is fixedly connected with a bearing, one side of the bearing is fixedly connected with a motor, the tail end of the upper side of the motor is fixedly connected with a rotating cylinder, the inner side of the upper end of the rotating cylinder is fixedly connected with a supporting rod, and the outer side of the rotating cylinder is fixedly connected with a scraper. The motor drives the rotating cylinder to rotate, so that the scraper on the outer side of the rotating cylinder clings to the inner wall of the dehydrating tower shell can clean and collect condensed coke into the collecting box, the interior of the dehydrating tower can be effectively decoked in the ethylene glycol dehydrating process, the heat transfer efficiency of the inner side of the dehydrating tower is enhanced, and the ethylene glycol extracting efficiency is improved.

The invention discloses a preparation method of cyclic ether. The preparation method comprises the following steps: carrying out contact reaction on ethylene glycol and a catalyst to obtain 1, 4-dioxane; the catalyst is a phosphorus-modified hierarchical pore H-type molecular sieve. The catalyst provided by the invention is applied to a reaction for preparing 1, 4-dioxane through an ethylene glycol dehydration reaction, so that the conversion rate of ethylene glycol and the selectivity of the generated 1, 4-dioxane are improved.

The present invention provides an ethylene glycol production process for increasing the production of diethylene glycol and triethylene glycol, which includes an ethylene glycol process module, a diethylene glycol refining unit, and a triethylene glycol refining unit; the ethylene glycol process module, the diethylene glycol refining unit, and the triethylene glycol refining unit are sequentially connected through material pipelines. The ethylene glycol process module further includes an ethylene glycol feed stripping unit and an ethylene glycol dehydration unit, and the ethylene glycol dehydration unit is located downstream of the ethylene glycol feed stripping unit. A pipeline is additionally provided and connected between the outlets at three positions, namely the reflux pump of the ethylene glycol refining column, the side stream extraction of the ethylene glycol refining column, and the side stream extraction of the diethylene glycol refining column, and the ethylene glycol feed stripping unit. By reforming the ethylene glycol production system device, the present invention realizes the adjustment of the output of ethylene glycol and the conversion to diethylene glycol products and triethylene glycol products, so as to solve the problem that the yields of diethylene glycol products and triethylene glycol products in the existing ethylene glycol production process are limited by the hydration ratio and cannot be further increased.

This invention relates to an apparatus and method for recovering methanol and ethanol through methanol distillation coupled with ethylene glycol distillation. The method includes the following steps: collecting fusel oil from the side stream of the atmospheric distillation column, cooling it, and adding alkali to obtain alkali-treated fusel oil; mixing the alkali-treated fusel oil with the feed from the ethylene glycol dehydration column to obtain pretreated fusel oil; the pretreated fusel oil entering the ethylene glycol dehydration column from the middle section, and collecting fuel ethanol from the side stream of the middle section and methanol from the top of the column. This method recovers methanol and ethanol with low modification costs and high recovery rates without excessive site occupation or the need for new construction projects, thus generating economic benefits.

Systems and methods presented herein generally relate to recycling, or reducing flaring or venting, of vent gases from glycol based dehydration of natural gas. Some systems and methods use high pressure gas, high pressure glycol, or pump-assisted high pressure glycol to provide motive energy to draw reflux gas and / or skimmer gas through one or more venturis and back to the contact tower of the dehydration system. Some systems and methods provide for harvesting energy from the dehydration process.

The invention discloses a method for preparing monovinyl glycol ether by dehydrating glycol, which comprises the following steps of: enabling glycol with a structural formula of HOCH2CH2 (OCH2CH2) nOH (n is a positive integer) to pass through a bed filled with a supported solid base catalyst, and reacting under the reaction conditions that the reaction temperature is 350-500 DEG C, the system pressure is 0.01-1.00 MPa, the weight space velocity of glycol liquid is 0.05-5.00 h <-1 > and the volume space velocity of diluted gas is 0-5000 h <-1 >, and preparing the monovinyl glycol ether with a structural formula of CH2 = CH (OCH2CH2) nOH. The method has the advantages of high selectivity of vinyl hydroxyl ether products, low production cost, large-scale device, simple reaction process and safe and environment-friendly process.

A set of process equipment for use in an enhanced oil recovery (EOR) process comprises first piping, a dehydrator, second piping, and a natural gas liquids recovery column. The first piping is configured to receive a wet carbon dioxide recycle stream from a recovery well. The dehydrator is configured to receive the wet carbon dioxide stream from the first piping and configured to dehydrate the wet carbon dioxide recycle stream using ethylene glycol to produce a dry carbon dioxide recycle stream. The second piping is configured to receive the dry carbon dioxide recycle stream from the dehydrator. The natural gas liquids recovery column is configured to receive the dry carbon dioxide recycle stream from the second piping and configured to separate the dry carbon dioxide recycle stream into a carbon dioxide reinjection stream and a natural gas liquids stream.

The invention discloses preparation and application of a catalyst for preparing acetaldehyde through ethylene glycol dehydration, and belongs to the technical field of chemical engineering. The catalyst is an acidic molecular sieve, and the molecular sieve is selected from one or a combination of more than two of molecular sieves of which the structure types are MWW, FER, MFI, MOR, FAU and BEA; the molecular sieve is prepared by sequentially carrying out organic ammonium salt exchange, acidic molecule loading and ammonium ion exchange and then roasting. The catalyst disclosed by the invention is mild in catalytic condition, simple in preparation process, easy to industrially amplify and easy to recycle, has relatively high catalytic activity in the process of preparing acetaldehyde by dehydrating ethylene glycol, and has a very good application prospect.

The invention relates to the technical field of ethylene glycol production dehydration, and discloses a dehydration treatment device for ethylene glycol production and a use method thereof.The dehydration treatment device comprises a distillation barrel, the distillation barrel comprises a stirring shaft rotationally connected to the inner wall of the distillation barrel, and the outer wall of the stirring shaft is fixedly connected with the outer wall of a motor; the outer wall of the stirring shaft is fixedly connected with a plurality of fan blades, the outer walls of the fan blades are connected with scraping plates in an attached mode, the pipeline is installed at the needed position before use, it is guaranteed that condensate reaches the needed position and temperature, after ethylene glycol enters the distillation barrel through the first pipe, the heating mechanism can conduct heating, and when the ethylene glycol is heated to 100 DEG C or above, the heating mechanism can conduct heating; when the temperature is lower than 197.3 DEG C, excessive water in the ethylene glycol is evaporated to form water vapor, the temperature in the distillation barrel is stably controlled through the air pressure thermometer, and the ethylene glycol is in a stable state when the water is evaporated, so that the quality and the purity of the ethylene glycol are improved, and the aim of dehydrating the ethylene glycol is fulfilled.

The invention discloses a 1, 4-dioxane preparation method, which comprises: carrying out a contact reaction on ethylene glycol and a catalyst to obtain 1, 4-dioxane, the catalyst is an HClO4 / pure silicon molecular sieve. The catalyst provided by the invention is applied to a reaction for preparing 1, 4-dioxane through an ethylene glycol dehydration reaction, so that the conversion rate of ethylene glycol and the selectivity of the generated 1, 4-dioxane are improved.

The application discloses a preparation method of diethylene glycol, which comprises the following steps: contacting ethylene glycol with a catalyst, and reacting to obtain the diethylene glycol; the catalyst is SO4 2‑ / ZnFeO4-ZrO2 obtained by impregnating the surface of ZnFeO4 loaded with ZrO2 with sulfuric acid. The catalyst provided by the application is applied to a diethylene glycol dehydration reaction for preparing diethylene glycol, so as to improve the conversion rate of ethylene glycol and the selectivity of the generated diethylene glycol.

The application discloses a refining device and method and application of a polymerization product, and the refining device comprises a de-aldehyde tower, a de-watering tower, a water distribution tank, a light component removing tower, a by-product tower and a product tower. The reaction product obtained through the dehydration condensation reaction of ethylene glycol contains components such as water, acetaldehyde, diethylene glycol, 1,4-dioxane and 2-methyl dioxolane, and has the characteristics of complex components and multiple azeotrope pairs. The application provides a sequential rectification method by introducing azeotrope-breaking components for the components, so that the diethylene glycol product with high purity and the acetaldehyde and 1,4-dioxane by-products are separated, the process is continuous and easy to operate, and has industrial feasibility.

The application discloses a preparation method of 1,4-dioxane, which comprises the following steps: reacting ethylene glycol with a catalyst to obtain 1,4-dioxane; and the catalyst is HClO4 / pure silicon molecular sieve. The catalyst provided by the application is applied to the dehydration reaction of ethylene glycol to prepare 1,4-dioxane, so as to improve the conversion rate of ethylene glycol and the selectivity of the generated 1,4-dioxane.

The invention discloses a preparation method of 1, 4-dioxane, which comprises the following steps: carrying out contact reaction on ethylene glycol and a catalyst to obtain 1, 4-dioxane; the catalyst is SO4 < 2-> / HTaMoO6. The catalyst provided by the invention is applied to a reaction for preparing 1, 4-dioxane through an ethylene glycol dehydration reaction, so that the conversion rate of ethylene glycol and the selectivity of the generated 1, 4-dioxane are improved.

The invention discloses a preparation method of diethylene glycol, which comprises the following steps: contacting ethylene glycol with a catalyst, and reacting to obtain the diethylene glycol, the catalyst is SO4 < 2-> / ZnFeO4-ZrO2 obtained by carrying out dipping treatment on ZnFeO4 of which the surface is loaded with ZrO2 through sulfuric acid. The catalyst provided by the invention is applied to a reaction for preparing diethylene glycol through ethylene glycol dehydration reaction, so that the conversion rate of ethylene glycol and the selectivity of the generated diethylene glycol are improved.

The utility model discloses dry gas seal recovery equipment for a recycle gas compressor of an ethylene oxide device, which belongs to the technical field of chemical production equipment and comprises a carbon dioxide desorption tower vacuum ejector, a carbon dioxide desorption tower, a reboiler, the recycle gas compressor, a steam turbine, a recycle gas compressor dry gas seal, a vacuum ejector and an ethylene glycol dehydrating tower. The ethylene glycol discharge flash tower, the MEG refining tower, the MEG circulating tower, the DEG refining tower, the TEG refining tower and the ethylene membrane recovery device are used for recovering ethylene in the dry gas seal of the recycle gas compressor, the upper part of the ethylene membrane recovery device is connected with the dry gas seal of the recycle gas compressor through a pipeline, the lower part of the ethylene membrane recovery device is connected with the RTO combustion system through a pipeline, and the side part of the ethylene membrane recovery device is connected with the recycle gas through a pipeline; the ethylene energy waste is solved, the energy cost of the operation of an epoxy device is reduced, and the technology is mainly applied to ethylene oxide production.

The invention provides a method for preparing 1, 4-dioxane by catalyzing dehydration etherification of diethylene glycol through phosphotungsten / molybdenum solid acid, and relates to the technical field of catalysts. The chemical formula of the phosphotungsten / molybdenum solid acid is AxH (3-x) PB12O40. YH2O, A is Cs or Rb, B is W or Mo, x is equal to 0.5-3, and y is a natural number; the 1, 4-dioxane is obtained by catalyzing intramolecular dehydration and etherification of diethylene glycol by utilizing abundant acid sites on the surface of the solid acid and excellent dehydration performance. The method for preparing the 1, 4-dioxane through catalysis of the phosphotungsten (molybdenum) solid acid has the advantages of being simple in catalyst preparation cost, high in diethylene glycol conversion rate, good in 1, 4-dioxane selectivity and capable of being recycled and reused, and in addition, the process further has the advantages of being free of corrosion to equipment and small in environmental pollution.

The invention relates to the field of pervaporation dehydration, in particular to a method for dehydrating ethylene glycol feed liquid with high conductivity. The SSZ-13 molecular sieve membrane with a high silica-alumina ratio is adopted as a key membrane material, good stability can be kept in pervaporation dehydration of ethylene glycol feed liquid with the conductivity of 50-2000 [mu] S / cm, and the dehydration capacity of the membrane material on ethylene glycol dehydration is further improved by modifying the membrane material.

The application discloses a kind of ethylene glycol predehydration tower device and its use method, belong to ethylene glycol dehydration technical field, including for the predehydration of ethylene glycol aqueous solution ethylene glycol predehydration tower, it is characterized by: in the ethylene glycol predehydration tower from top to bottom installation mist pad, spraying device, first elastic tray, second elastic tray, third elastic tray and fourth elastic tray, wherein, first elastic tray, second elastic tray, third elastic tray and fourth elastic tray are identical in structure, and the passage of flexible valve as vapor-liquid outlet is provided in the elastic tray, and the opening degree of flexible valve is automatically adjusted according to the change of vapor-liquid flow, and it also has downcomer, for the liquid of upper tray is introduced to the tray of lower part, the condensate of upper tray is introduced to the tray of lower part and gas phase is contacted and mixed, solve the technical problems that the operation flexibility of ethylene glycol predehydration tower is low and the predehydration effect is poor, mainly applied to ethylene glycol predehydration.

The application discloses a preparation method of 1,4-dioxane, which comprises the following steps: reacting ethylene glycol with a catalyst to obtain 1,4-dioxane; the catalyst is SO4 2‑ / HTaMoO6. The catalyst provided by the application is applied to the reaction of preparing 1,4-dioxane by dehydrating ethylene glycol, so as to improve the conversion rate of ethylene glycol and the selectivity of the generated 1,4-dioxane.

The invention discloses a method for preparing diethylene glycol by adopting a composite catalyst, which comprises the following steps: carrying out contact reaction on ethylene glycol and a catalyst to obtain diethylene glycol, the catalyst is modified perfluorinated sulfonic acid resin / SiO2. The catalyst provided by the invention is applied to a reaction for preparing diethylene glycol through ethylene glycol dehydration reaction, so that the conversion rate of ethylene glycol and the selectivity of the generated diethylene glycol are improved.