CN114130063A - Extraction and impurity removal device and method for recovering methanol through chlorination in maltol production - Google Patents
Extraction and impurity removal device and method for recovering methanol through chlorination in maltol production Download PDFInfo
- Publication number
- CN114130063A CN114130063A CN202111506355.4A CN202111506355A CN114130063A CN 114130063 A CN114130063 A CN 114130063A CN 202111506355 A CN202111506355 A CN 202111506355A CN 114130063 A CN114130063 A CN 114130063A
- Authority
- CN
- China
- Prior art keywords
- extraction
- methanol
- tank
- layering
- maltol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/02—Solvent extraction of solids
- B01D11/028—Flow sheets
-
- 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
- C07C29/86—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by liquid-liquid treatment
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
- C07D309/34—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D309/36—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with oxygen atoms directly attached to ring carbon atoms
- C07D309/40—Oxygen atoms attached in positions 3 and 4, e.g. maltol
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Saccharide Compounds (AREA)
Abstract
The application discloses chloridize recovery methyl alcohol extraction edulcoration device in maltol production, its characterized in that: the device comprises an extraction circulating pump, an extraction mixer and a layering tank, wherein the extraction circulating pump is connected with the extraction mixer, and a discharge end on the upper side of the extraction mixer is connected with the layering tank. Also discloses an extraction and impurity removal method for recovering methanol by chlorination in maltol production. The quality of the recovered methanol is improved, and the side reaction is reduced.
Description
The application claims the application date of 12-11.2020, the application number of 202011442636.3, and the invention discloses the priority of Chinese patent application named as extraction and impurity removal device and method for chlorinated recovered methanol in maltol production.
Technical Field
The invention relates to an extraction impurity removal device and an impurity removal method for recovering methanol through chlorination in maltol production.
Background
In the production process of maltol, methanol water solution is required to be used as a solvent for chlorination reaction and is recycled, and a large amount of impurities generated along with side reaction are dissolved in recovered methanol solution, so that the yield of chlorination reaction is seriously influenced.
The use of aqueous methanol as a solvent for the chlorination reaction has been reported in a number of documents. Chinese patent document CN105906597B is a synthesis process of ethyl maltol, a chlorination reaction method in the production of maltol in chinese patent document CN106366062A, and a chlorination hydrolysis production method in the production of ethyl maltol in chinese patent document CN 104341378A. The use of methanol is widespread in the production of maltol. If methanol is not recycled, the cost is too high, and the waste treatment is complex.
Chinese patent document CN101696196A discloses a method for increasing furfural yield and recovering methanol, wherein an upper aqueous phase flowing out from the upper part of an aldehyde-water separator and an upper aqueous phase flowing out from the upper part of a water washing tower enter a light component removing tower from a feed inlet in the middle of the light component removing tower, after being heated by a heater at the bottom of the light component removing tower, methanol gas in the aqueous phase rises along the light component removing tower, and fully contacts with the aqueous phase entering the light component removing tower when passing through a tower plate of a stripping section, after mass transfer and heat transfer, and then fully contacts with refluxed methanol on a tower plate of a refining section, after mass transfer and heat transfer, is led out from the top of the light component removing tower, and after being cooled and converted into liquid by a tower top condenser, liquid is separated by a liquid separating tank, a small part of methanol refluxes, a large part of methanol enters a methanol storage tank, and the aqueous phase (aldehyde-water mixed liquid) of the methanol-removed gas led out from the bottom of the light component removing tower returns to a primary distillation tower. Chinese patent document CN206955922U discloses a methanol recycling method, wherein a crude methanol material contained in a crude methanol tank 6 is fed by a feeding pump 5, the material is provided with a preheater 4 during feeding, vinegar methanol is evaporated, and then enters a recovery tower 2 from a left end gas distribution barrel 7 of a feeding port 3, vent holes are uniformly arranged on the outer wall of the gas distribution barrel 7, so that gas can be uniformly distributed in the recovery tower 2 through the vent holes, formaldehyde gas uniformly enters a plate tower 8 upwards, meanwhile, an extractant tank 11 starts a liquid discharge valve, a desalted water extraction solution is introduced into the plate tower 8 in the recovery tower 2, and then descends plate by plate through an overflow pipe 9, a liquid layer is accumulated on each plate to form a liquid seal, formaldehyde vapor enters from the bottom of the tower, is dispersed into small bubbles through tooth seams or small grooves on the bottom edge of a bubble cap 10, fully contacts with liquid and passes through the liquid layer to reach the liquid level, then the gas is lifted into the upper layer of tower plate 8, the gas flows from bottom to top, water flows from top to bottom to fully absorb and separate the gas, the flowing-down methanol solution containing high purity can be cooled by a cooler 14 and then is collected by a fine methanol tank 15, the gas after separation and absorption continuously flows upwards to pass through a demister 12 for gas drying, and the dried gas enters the subsequent process through a gas outlet 13 arranged on the top wall of the recovery tower 2.
In the prior art, patent documents CN102698569A and CN101084176A both disclose systems for recovering methanol.
The recovery of methanol in the prior art is divided into recovery for methanol production and recovery of methanol as a solvent in other production processes. When methanol is used as a solvent, other impurities, quality requirements for recovery, and the like need to be taken into consideration during recovery, and it is necessary to adapt to a certain situation.
At present, no good method exists for recovering methanol in the production process of maltol.
Disclosure of Invention
The invention aims to solve the first technical problem of providing an extraction and impurity removal device for recovering methanol through chlorination in maltol production, which has a simple structure, is convenient to use and can continuously react.
The invention aims to solve the second technical problem of providing the impurity removing method of the extraction and impurity removing device for the chlorination recovery of methanol in the production of maltol, which has the advantages of simple steps, convenient operation, full-automatic operation in the whole process, time saving and labor saving.
In order to solve the first technical problem of the technology, the invention provides an extraction and impurity removal device for chlorinated recovered methanol in maltol production, which comprises a recovered methanol tank, an extractant tank, an extraction circulating pump, an extraction mixer, a layering tank, an extracted methanol tank and an impurity tank, wherein a discharge pipeline of the recovered methanol tank is firstly converged with a discharge pipeline of the extractant tank and then connected with a feed end at the lower side of the extraction mixer through the extraction circulating pump, flow meters and corresponding valves are respectively connected in series on the discharge pipeline of the recovered methanol tank and the discharge pipeline of the extractant tank, a discharge end at the upper side of the extraction mixer is connected with an inlet at the middle part of the layering tank, an outlet at the lower side of the layering tank is connected with the impurity tank, and an outlet at the upper side of the layering tank is connected with the extracted methanol tank.
For the sake of simple explanation, the device for extracting and removing impurities from methanol recovered by chlorination in the production of maltol according to the present invention is simply referred to as the present device.
The device has the advantages that: the device has simple structure and convenient use, and can continuously react.
In order to solve the second technical problem, the invention provides an impurity removal method of an extraction and impurity removal device for recovering methanol by chlorination in maltol production, which comprises the following steps:
(1) the feeding flow of the recovered methanol is controlled to be 1m by controlling the valve opening of the discharging pipeline of the recovered methanol tank and the valve opening of the discharging pipeline of the extractant tank3The feeding amount of the extracting agent is 200L/h, a circulating pump is started to enable the mixed solution to enter an extraction mixer, and the extracting agent is desalted water;
(2) after the extraction mixer is filled, the mixed liquid overflows from the discharge end on the upper side of the extraction mixer and enters the layering tank from the middle part of the layering tank;
(3) the layering interface can be seen from transparent pipe level gauge department after the layering groove is full of, continues the feeding, and upper strata light phase overflows to the back methyl alcohol groove of extraction from the layering groove top, and lower floor's heavy phase overflows to the impurity groove from the layering tank bottom, makes the interface stable through fine setting feed flow, continuous operation.
Chlorination recovery methyl alcohol extraction edulcoration device in maltol production, including extraction circulating pump, extraction blender, layering groove, the extraction circulating pump is connected with the extraction blender, and extraction blender upside discharge end is connected with the layering groove.
Further, the extraction circulating pump is connected with the feed end at the lower side of the extraction mixer.
Furthermore, the discharge end on the upper side of the extraction mixer is connected with the inlet in the middle of the layering tank.
Further, still including retrieving methyl alcohol groove, extractant groove, extraction back methyl alcohol groove, impurity groove, retrieve methyl alcohol groove discharge pipeline and join earlier with extractant groove discharge pipeline, retrieve and all establish ties on methyl alcohol groove discharge pipeline, the extractant groove discharge pipeline and have a flowmeter and correspond the valve, the lower side export of layering groove is connected with the impurity groove.
An extraction impurity removal method for recovering methanol in maltol production comprises the following steps:
step 1: controlling the feeding flow of the recovered methanol and the feeding flow of the extracting agent, and starting a circulating pump to enable the mixed solution to enter an extraction mixer;
step 2: the mixed liquid overflows from the discharge end at the upper side of the extraction mixer and enters the layering tank from the middle part of the layering tank;
and step 3: and after the layering tank is full, feeding is continued, the upper layer light phase overflows to the methanol tank after extraction from the top of the layering tank, and the lower layer heavy phase overflows to the impurity tank from the bottom of the layering tank.
Further, in step 1, methanol is first combined with the extractant and then fed through the lower side of the extraction mixer.
Further, the extractant is desalted water.
Further, the methanol feeding flow and the extracting agent feeding flow are 5: 1.
for the sake of simplicity of explanation, the impurity removal method of the extraction and impurity removal device for recovering methanol by chlorination in the production of maltol is simply referred to as the present method.
The method has the advantages that: the method has the advantages of simple steps, convenient operation, full-automatic operation in the whole process, time and labor saving, and improvement of the quality of the recovered methanol, reduction of side reactions and improvement of the yield of the chlorination reaction after the impurities in the chlorinated recovered methanol are separated.
Drawings
Fig. 1 is a schematic structural view of the present apparatus.
Detailed Description
In the chlorination section for preparing maltol or ethyl malt powder, furfuryl alcohol is subjected to chlorination, hydrolysis and rearrangement to form maltol. Methanol is required to dissolve furfuryl alcohol and the chlorination process uses an aqueous methanol solution. After the chlorination stage is completed, the mixed liquor comprises: furfuryl alcohol chlorination liquid, methanol, water, hydrogen chloride, methyl chloride and the like. The reaction mixture is heated and distilled, and organic impurity gas is mixed with the distillation of methanol. After condensation, methanol is mixed with a large amount of dissolved organic impurities. Such methanol cannot be used directly. Traditionally, multiple rectifications of methanol have been required.
In this case, the application requires a low-cost separation of methanol. The result of the separation is not to obtain commercially available methanol, but methanol which can be recycled. The present application contemplates the use of an extractant to extract methanol using the difference in solubility of the extractant, followed by separation of impurities using the difference in density. After separation, the methanol can be directly recycled.
The first embodiment is as follows:
referring to fig. 1, chlorination recovery methyl alcohol extraction edulcoration device in maltol production, including retrieving methyl alcohol groove 1, extractant groove 2, extraction circulating pump 3, extraction blender 4, layering groove 5, extraction back methyl alcohol groove 7, impurity groove 6, retrieve 1 ejection of compact pipeline in methyl alcohol groove and 2 ejection of compact pipelines in extractant groove and converge earlier, methyl alcohol groove ejection of compact pipeline and extractant groove ejection of compact pipeline are converging the in-process, the mixing process takes place for material and extractant in the methyl alcohol groove, at this in-process, methyl alcohol and extractant take place to dissolve mutually, extract methyl alcohol from organic matter impurity. Then through extraction circulating pump 3 with extraction mixer 4 downside feed end be connected, given a power of misce bene from the extraction circulating pump for misce bene gets into the extraction mixer from extraction mixer downside feed end. Due to the feeding from the lower feed end of the extraction mixer, the mixed material begins to stratify after entering the extraction mixer. Along with continuous feeding, the light phase rises, and the discharge end discharge on the upper side of the extraction mixer 4 is the light phase, thereby realizing separation. The discharging pipeline of the methanol recovery tank 1 and the discharging pipeline of the extractant tank 2 are both connected in series with a flowmeter and a corresponding valve, and the discharging end on the upper side of the extraction mixer 4 is connected with the inlet in the middle of the layering tank 5. The middle part of the layering tank is fed, and the feed liquid is mixed liquid, so that the heavy phase moves downwards and the light phase moves upwards after the middle part is fed. Layering is accomplished in the layering slots. The outlet at the lower side of the layering tank 5 is connected with an impurity tank 6, and the outlet at the upper side of the layering tank 5 is connected with an extracted methanol tank 7.
Example two:
the impurity removing method of the extraction and impurity removing device for recovering methanol by chlorination in the production of maltol comprises the following steps:
(1) the feeding flow of the recovered methanol is controlled to be 1m by controlling the valve opening of the discharging pipeline of the recovered methanol tank and the valve opening of the discharging pipeline of the extractant tank3The feeding amount of the extracting agent is 200L/h, a circulating pump is started to enable the mixed solution to enter an extraction mixer, and the extracting agent is desalted water;
(2) after the extraction mixer is filled, the mixed liquid overflows from the discharge end on the upper side of the extraction mixer and enters the layering tank from the middle part of the layering tank;
(3) the layering interface can be seen from transparent pipe level gauge department after the layering groove is full of, continues the feeding, and upper strata light phase overflows to the back methyl alcohol groove of extraction from the layering groove top, and lower floor's heavy phase overflows to the impurity groove from the layering tank bottom, makes the interface stable through fine setting feed flow, continuous operation.
After the extraction impurity removal is maintained for a period of time, periodically taking a methanol solution from a methanol tank for detection;
the above aqueous methanol solution was used as a solvent in the chlorination stage, and a plurality of tests were conducted to compare it with the case of the test conducted using commercially available methanol as a solvent in the chlorination stage.
Comparative example 1:
pumping commercially available methanol into a precooling kettle, and mixing the methanol and water according to the volume ratio of 3: 2 to obtain a methanol solution; 500Kg of furfuryl alcohol and 400Kg of methanol solution are stirred uniformly for later use. Pumping the prepared methanol solution into a chlorination kettle, freezing to below-7 ℃, introducing chlorine, dropwise adding methanol solution of furfuryl alcohol into the chlorination kettle for chlorination reaction, and discharging after the reaction is finished. After purification, a total of 320kg maltol was obtained. The purity of maltol is 99.5%.
Comparative example 2:
after the purified methanol is pumped into a precooling kettle, the methanol and the water are prepared according to the volume ratio of 3: 2 due to the water contained in the methanol; the other reaction conditions were the same as in comparative example 1, and 331kg of maltol was obtained in total. The purity of maltol is 99.6%.
As can be seen from the above comparative examples 1 and 2, although the aqueous methanol solution in the methanol tank has some impurities, the use as a solvent in the chlorination stage does not affect the yield and purity of maltol. Through the scheme of this application for methanol recycling effect has reached the effect that purchases methyl alcohol the same basically in the market.
While the foregoing is directed to embodiments of the present application, other modifications and variations of the present application may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present application, and the scope of protection of the present application shall be subject to the scope of protection of the claims.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Claims (9)
1. Chlorination recovery methanol extraction edulcoration device in maltol production, its characterized in that: the device comprises an extraction circulating pump, an extraction mixer and a layering tank, wherein the extraction circulating pump is connected with the extraction mixer, and a discharge end on the upper side of the extraction mixer is connected with the layering tank.
2. The extraction and impurity removal device for methanol recovered by chlorination in maltol production according to claim 1, wherein the extraction circulation pump is connected with the lower side feed end of the extraction mixer.
3. The extraction and impurity removal device for methanol recovered by chlorination in maltol production according to claim 1, wherein the upper side discharge end of the extraction mixer is connected with the inlet in the middle of the layering tank.
4. The extraction and impurity removal device for the methanol recovered by chlorination in the maltol production according to any one of claims 1-3, further comprising a methanol recovery tank, an extractant tank, a methanol tank after extraction, and an impurity tank, wherein a discharge pipeline of the methanol recovery tank and a discharge pipeline of the extractant tank are firstly converged, a flow meter and a corresponding valve are respectively connected in series on the discharge pipeline of the methanol recovery tank and the discharge pipeline of the extractant tank, and an outlet at the lower side of the layering tank is connected with the impurity tank.
5. The impurity removing method of the extraction and impurity removing device for the chlorination recovery of methanol in the maltol production according to any one of claims 1 to 4, which is characterized by comprising the following steps:
(1) the feeding flow of the recovered methanol is controlled to be 1m by controlling the valve opening of the discharging pipeline of the recovered methanol tank and the valve opening of the discharging pipeline of the extractant tank3The feeding amount of the extracting agent is 200L/h, a circulating pump is started to enable the mixed solution to enter an extraction mixer, and the extracting agent is desalted water;
(2) after the extraction mixer is filled, the mixed liquid overflows from the discharge end on the upper side of the extraction mixer and enters the layering tank from the middle part of the layering tank;
(3) the layering interface can be seen from transparent pipe level gauge department after the layering groove is full of, continues the feeding, and upper strata light phase overflows to the back methyl alcohol groove of extraction from the layering groove top, and lower floor's heavy phase overflows to the impurity groove from the layering tank bottom, makes the interface stable through fine setting feed flow, continuous operation.
6. An extraction impurity removal method for recovering methanol in maltol production is characterized by comprising the following steps:
step 1: controlling the feeding flow of the recovered methanol and the feeding flow of the extracting agent, and starting a circulating pump to enable the mixed solution to enter an extraction mixer;
step 2: the mixed liquid overflows from the discharge end at the upper side of the extraction mixer and enters the layering tank from the middle part of the layering tank;
and step 3: and after the layering tank is full, feeding is continued, the upper layer light phase overflows to the methanol tank after extraction from the top of the layering tank, and the lower layer heavy phase overflows to the impurity tank from the bottom of the layering tank.
7. The method for removing impurities by extraction for recovering methanol in the production of maltol according to claim 6, comprising the steps of:
in step 1, methanol and the extractant are first combined and then fed through the lower side of the extraction mixer.
8. The method for removing impurities by extraction for recovering methanol in the production of maltol according to claim 6, comprising the steps of:
the extractant is desalted water.
9. The method for removing impurities by extraction for recovering methanol in the production of maltol according to claim 6, comprising the steps of:
the methanol feed flow and the extractant feed flow are 5: 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011442636.3A CN112516622A (en) | 2020-12-11 | 2020-12-11 | Extraction and impurity removal device and method for recovering methanol through chlorination in maltol production |
| CN2020114426363 | 2020-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114130063A true CN114130063A (en) | 2022-03-04 |
Family
ID=75000088
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011442636.3A Pending CN112516622A (en) | 2020-12-11 | 2020-12-11 | Extraction and impurity removal device and method for recovering methanol through chlorination in maltol production |
| CN202111506355.4A Pending CN114130063A (en) | 2020-12-11 | 2021-12-10 | Extraction and impurity removal device and method for recovering methanol through chlorination in maltol production |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011442636.3A Pending CN112516622A (en) | 2020-12-11 | 2020-12-11 | Extraction and impurity removal device and method for recovering methanol through chlorination in maltol production |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN112516622A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117531219A (en) * | 2023-09-28 | 2024-02-09 | 滁州金沃生物科技有限公司 | Continuous purification device and method for recovering methanol in maltol/ethyl maltol production |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0920702A (en) * | 1995-06-30 | 1997-01-21 | Tsushosangyosho Kiso Sangyokyokucho | Production of purified ethanol |
| CN207483642U (en) * | 2017-11-15 | 2018-06-12 | 北京欧谊德科技有限公司 | A kind of novel carbinol extraction and recovery system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105218313B (en) * | 2014-07-03 | 2017-08-11 | 中国石油化工股份有限公司 | Methanol purification process containing acetaldehyde impurities |
| CN206476921U (en) * | 2017-01-20 | 2017-09-08 | 兖矿国宏化工有限责任公司 | A kind of system for improving methanol output and quality |
| CN108299362B (en) * | 2018-01-13 | 2021-07-09 | 安徽金禾实业股份有限公司 | Method for separating impurities in maltol crude product |
| CN210078905U (en) * | 2019-05-29 | 2020-02-18 | 重庆川维石化工程有限责任公司 | Extraction tank for separating light components at top of methanol rectification tower |
-
2020
- 2020-12-11 CN CN202011442636.3A patent/CN112516622A/en active Pending
-
2021
- 2021-12-10 CN CN202111506355.4A patent/CN114130063A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0920702A (en) * | 1995-06-30 | 1997-01-21 | Tsushosangyosho Kiso Sangyokyokucho | Production of purified ethanol |
| CN207483642U (en) * | 2017-11-15 | 2018-06-12 | 北京欧谊德科技有限公司 | A kind of novel carbinol extraction and recovery system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117531219A (en) * | 2023-09-28 | 2024-02-09 | 滁州金沃生物科技有限公司 | Continuous purification device and method for recovering methanol in maltol/ethyl maltol production |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112516622A (en) | 2021-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105906122A (en) | Treatment technology of high-organic matter high-salt wastewater and treatment device thereof | |
| CN109928861A (en) | A kind of method of purification recycling methylene chloride from solvent slop | |
| CN114130063A (en) | Extraction and impurity removal device and method for recovering methanol through chlorination in maltol production | |
| CN106831472A (en) | A kind of DMF salt bearing liquid wastes recovery process and system | |
| CN103524478A (en) | Device and method for shortening ketalation time in ibuprofen synthesis process | |
| CN110066684A (en) | A kind of recovery method of lithium battery diaphragm white oil | |
| CN102992949B (en) | Industrialized recycling method for o-chlorobenzaldehyde residual liquor | |
| CN107556213A (en) | A kind of technique of cyclohexanone oxamidinating and the technique for manufacturing caprolactam | |
| CN114213208B (en) | Method for extracting, rectifying and purifying mesitylene by high-efficiency composite solvent | |
| CN216419325U (en) | Chloro-o-xylene continuous oxidation device, system and bubbling reactor | |
| CN214457698U (en) | Device for recovering benzoic acid from biphenyl substances | |
| CN215288583U (en) | Pyrazole semi-continuous production device | |
| CN102442892B (en) | Preparation method of unsaturated aldehyde by aldehyde condensation | |
| CN112694401A (en) | Ethyl acetate production system and production method thereof | |
| CN113735695A (en) | Method for preparing high-carbon aldehyde by adopting high-carbon olefin and production device thereof | |
| CN209778702U (en) | Device for separating n-butyl alcohol and n-butyl ether by extraction and rectification processes | |
| CN114014743A (en) | Method for continuously producing hexafluorobutadiene | |
| CN208526214U (en) | A kind of de- benzene device of low energy consumption local decompression | |
| CN206337192U (en) | A kind of process units of ethylene glycol diethyl ether | |
| CN221093985U (en) | Device for recycling crude phenol from semi-coke wastewater and refining crude phenol | |
| CN221309584U (en) | Solvent recovery continuous extraction rectifying device | |
| CN217220238U (en) | Metal extractant rectifier unit | |
| CN102381794B (en) | Process and device for recycling comprehensive treatment of alkyd resin wastewater | |
| CN221867428U (en) | Rectification system for extracting bromine | |
| CN218106775U (en) | Methyl isopropyl ketone purification system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |