CN103585890A - Cleaning method for silicon carbide membrane used for impurity removal in production of epoxy ester plasticizer - Google Patents
Cleaning method for silicon carbide membrane used for impurity removal in production of epoxy ester plasticizer Download PDFInfo
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- CN103585890A CN103585890A CN201310625308.0A CN201310625308A CN103585890A CN 103585890 A CN103585890 A CN 103585890A CN 201310625308 A CN201310625308 A CN 201310625308A CN 103585890 A CN103585890 A CN 103585890A
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Abstract
The invention discloses a cleaning method for a silicon carbide membrane used for impurity removal in production of an epoxy ester plasticizer. The method comprises the following steps: washing with an organic solvent; washing with a surfactant; hand-operated backswing; and electrothermal air blowing. Application of the silicon carbide membrane cleaning method in a filtering process for highly viscous grease materials enables a substantial membrane flux recovery effect to be obtained. The method overcomes the problems of a low recovery rate, a short period of effective operation time of a membrane, frequent cleaning, secondary pollution to the environment and the like of a traditional acid-base alternate cleaning method. According to the invention, washing with the organic solvent and washing with the surfactant are effective in removal of a highly viscous grease material on the surface of the membrane, and electrothermal air blowing enables membrane equipment to be rapidly dried, waste of the material caused by emulsification in the process of production to be prevented and cleaning time to be substantially shortened.
Description
Technical field
The present invention relates to special separation technical field, particularly a kind of being applied in epoxy-ester plasticizer production process except the silicon carbide film separating technology of using mixedly.
Technical background
Epoxy-ester plasticizer comprises epoxy aliphatic acid methyl ester, epoxy soybean wet goods, in the production process of this series products, can add solid-liquid mixed catalyst, in and in water-washing process, can add pulpous state calcium hydroxide, and crude oil itself just contains the impurity such as phosphatide, wax.Thereby cause in product and have some insoluble impurities, cause epoxy-ester plasticizer product muddy, shade deviation.
At present, the production technology in enterprise is to adopt filter press, and adds the filter aids such as diatomite with adsorption precipitation particulate, and product is filtered and obtain high-quality epoxy-ester plasticizer.Meanwhile, the solid waste thing containing epoxy-ester plasticizer and filter residue also produces in a large number, to environment, causes severe contamination.
The inorganic ceramic membrane that silicon carbide film is a kind of high flux, acid and alkali-resistance, good mechanical property, filtering accuracy is high and the life-span is long.Based on the good strainability of silicon carbide film, silicon carbide film separator to products of separated impurity in epoxy-ester plasticizer production process, is substituted diatom soil pressure filter by first Application.By production, verify, silicon carbide film impurity-eliminating effect in epoxy-ester plasticizer production process is remarkable, and flux is large, and operating characteristics is stable.
In film industry, traditional cleaning method is that soda acid alternately cleans at a certain temperature, and for serious pollution film, except improving cleaning temperature, strong acid, highly basic also add the oxidants such as clorox and surfactant outside alternately cleaning conventionally.For the filtration of high-viscosity oil fat material, these conventional methods cleaning membrane flux recovery rates are low, and film effective run time is short, and wash number is frequent, and environment is caused to secondary pollution.
Summary of the invention
The present invention be directed to silicon carbide film separator and after removal of impurities, apply general acid-alkali washing method in epoxy-ester plasticizer production process, membrane flux is provided by the problem such as very poor, a set of cleaning new method for high-viscosity oil fat material filtering caudacoria providing.The method is from material nature, the result that designs and test out, and repeatedly application in actual production process, it is good that membrane flux recovers, and the time is short, does not affect serialization and produces.
To achieve these goals, the present invention adopts following technical scheme:
A silicon carbide film cleaning method for epoxy-ester plasticizer production removal of impurities, comprises the following steps: the rinsing of organic solvent washing → surfactant washing → alkali lye cleaning → clear water rinsing → acid solution cleaning → clear water coordinates manually recoil → electric heating air blast.
As preferably, above-mentioned a kind of silicon carbide film cleaning method for the removal of impurities of epoxy-ester plasticizer production, whole cleaning process is to carry out at normal temperatures.
As preferably, above-mentioned a kind of silicon carbide film cleaning method for the removal of impurities of epoxy-ester plasticizer production, wherein in organic solvent washing process, organic solvent is a kind of in ethyl acetate, n-hexane and the carbon tetrachloride of technical grade; The Main Function of this organic solvent washing is the grease of removing pipeline and film surface for pre-; This organic solvent washing mode is opened centrifugal pump and is carried out wash cycles 5～10 minutes being equipment when normally producing, and different is to close penetrating fluid outlet valve, then emptying cleaning solution.
As preferably, above-mentioned a kind of silicon carbide film cleaning method for the removal of impurities of epoxy-ester plasticizer production, wherein in surfactant washing process, surfactant is a kind of in 1～5% lauryl sodium sulfate of concentration and neopelex, and the Main Function of this surfactant washing is to remove the bulky grain grease sticking in film surface and aperture; Scavenging period is 5～10 minutes, then emptying cleaning solution.
As preferably, above-mentioned a kind of silicon carbide film cleaning method for the removal of impurities of epoxy-ester plasticizer production, wherein in alkali lye cleaning process, alkali lye is that concentration is a kind of in 3～7% NaOH and potassium hydroxide solution, and the Main Function that this alkali lye cleans is to remove the granule grease adhering in film surface and membrane aperture; Scavenging period is 20～30 minutes, then emptying cleaning fluid.
As preferably, above-mentioned a kind of silicon carbide film cleaning method for the removal of impurities of epoxy-ester plasticizer production, wherein, in clear water rinse cycle, its main purpose is to rinse residual alkali lye, rinsing time 5～10 minutes, then emptying rinsing liquid.
As preferably, above-mentioned a kind of silicon carbide film cleaning method for the removal of impurities of epoxy-ester plasticizer production, wherein in acid solution cleaning process, acid solution is a kind of in nitric acid, oxalic acid and the citric acid solution of concentration 3～7%, it is eliminating particle inorganic salt precipitates that this acid solution is cleaned object, scavenging period is 20～30 minutes, then emptying cleaning fluid.
As preferably, above-mentioned a kind of silicon carbide film cleaning method for the removal of impurities of epoxy-ester plasticizer production, wherein coordinates in manual back flushing process in clear water rinsing, and its main purpose is to rinse residual acid solution, rinsing time 5～10 minutes.Manual liquid backwash during this time 2～4 times, drain time 5～10,1～5 second recoil time, in 1～3 minute recoil cycle, this rinses object is that the grease in duct is recoiled out, is washed away afterwards, then emptying rinsing liquid by the shearing force that cross-flow produced.
As preferably, above-mentioned a kind of silicon carbide film cleaning method for the removal of impurities of epoxy-ester plasticizer production, wherein, in electric heating air blast process, its main purpose is to dry up fast whole device systems, in order to avoid cause grease emulsifying because containing a small amount of water in grease removal of impurities process.
The present invention is mainly for the cleaning new method of the removal of impurities filtration system design of high-viscosity oil fat, adds organic solvent washing, surfactant washing and electric heating air blast technique at conventional soda acid on the basis of alternately cleaning.This whole set of cleaning method scavenging period is the longest 2.5 hours, and membrane flux response rate is high, after cleaning, can directly apply to production, does not affect product quality, does not waste raw materials for production.
The specific embodiment:
Below in conjunction with embodiment, further illustrate the present invention, but be not any restriction of context of the present invention.
Embodiment 1
The first step: at normal temperatures, 5% NaOH is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 30 minutes, discharges this alkali lye after 30 minutes.
Second step: at normal temperatures, clear water is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 10 minutes, discharges this clear water after 10 minutes.
The 3rd step: at normal temperatures, 5% nitric acid is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 30 minutes, discharges this acid solution after 30 minutes.
The 4th step: at normal temperatures, clear water is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and manual liquid backwash three times, 8 seconds of drain time, 3 seconds of recoil time, backwashing period is 1 minute, after 10 minutes, discharges this clear water.
The 5th step: a whole set of circulation valve is got to maximum, and open electric heating air blown producer, allow thermal current loop and dry up 20 minutes.
Method through the present embodiment is cleaned, and membrane flux recovery rate is wherein 72%.The method is that soda acid replaces ablution, and spended time is 100 minutes, and membrane flux recovery rate effect is undesirable.
Embodiment 2
The first step: at normal temperatures, 2% lauryl sodium sulfate is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 10 minutes, discharges this surfactant after 10 minutes.
Second step: at normal temperatures, 5% NaOH is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 30 minutes, discharges this alkali lye after 30 minutes.
The 3rd step: at normal temperatures, clear water is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 10 minutes, discharges this clear water after 10 minutes.
The 4th step: at normal temperatures, 5% nitric acid is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 30 minutes, discharges this acid solution after 30 minutes.
The 5th step: at normal temperatures, clear water is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and manual liquid backwash three times, 8 seconds of drain time, 3 seconds of recoil time, backwashing period is 1 minute, after 10 minutes, discharges this clear water.
The 7th step: a whole set of circulation valve is got to maximum, and open electric heating air blown producer, allow thermal current loop and dry up 20 minutes.
Method through the present embodiment is cleaned, and membrane flux recovery rate is wherein 83%.The method is in embodiment 1, to add surfactant washing process, and spended time is 110 minutes, and membrane flux recovery rate improves 8%.
Embodiment 3
The first step: at normal temperatures, the ethyl acetate of technical grade is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 5 minutes, discharges this organic solvent after 5 minutes.
Second step: at normal temperatures, 2% lauryl sodium sulfate is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 5 minutes, discharges this surfactant after 5 minutes.
The 3rd step: at normal temperatures, 5% NaOH is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 20 minutes, discharges this alkali lye after 20 minutes.
The 4th step: at normal temperatures, clear water is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 5 minutes, discharges this clear water after 5 minutes.
The 5th step: at normal temperatures, 5% nitric acid is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 20 minutes, discharges this acid solution after 20 minutes.
The 6th step: at normal temperatures, clear water is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and manual liquid backwash three times, 8 seconds of drain time, 3 seconds of recoil time, backwashing period is 1 minute, after 5 minutes, discharges this clear water.
The 7th step: a whole set of circulation valve is got to maximum, and open electric heating air blown producer, allow thermal current loop and dry up 20 minutes.
Method through the present embodiment is cleaned, and membrane flux recovery rate is wherein 95%, and the method is to have added organic solvent washing process at embodiment 2, spended time 80 minutes, and membrane flux recovery rate improves significantly.
Embodiment 4
The first step: at normal temperatures, the ethyl acetate of technical grade is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 10 minutes, discharges this organic solvent after 10 minutes.
Second step: at normal temperatures, 2% lauryl sodium sulfate is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 10 minutes, discharges this surfactant after 10 minutes.
The 3rd step: at normal temperatures, 5% NaOH is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 30 minutes, discharges this alkali lye after 30 minutes.
The 4th step: at normal temperatures, clear water is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 10 minutes, discharges this clear water after 10 minutes.
The 5th step: at normal temperatures, 5% nitric acid is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and scavenging period is set as 30 minutes, discharges this acid solution after 30 minutes.
The 6th step: at normal temperatures, clear water is added in silicon carbide film separation equipment, open centrifugal pump and carry out wash cycles, in this process, permeate valve is closed, and manual liquid backwash three times, 8 seconds of drain time, 3 seconds of recoil time, backwashing period is 1 minute, after 10 minutes, discharges this clear water.
The 7th step: a whole set of circulation valve is got to maximum, and open electric heating air blown producer, allow thermal current loop and dry up 20 minutes.
Method through the present embodiment is cleaned, and membrane flux recovery rate is wherein 99%.The method is the every step time lengthening of embodiment 3, spended time 120 minutes, and membrane flux recovery rate is improved, but improves not obvious.
Claims (9)
1. the silicon carbide film cleaning method for the removal of impurities of epoxy-ester plasticizer production, it is characterized in that, comprise the following steps: the rinsing of organic solvent washing → surfactant washing → alkali lye cleaning → clear water rinsing → acid solution cleaning → clear water coordinates manually recoil → electric heating air blast.
2. method according to claim 1, is characterized in that, whole cleaning process is carried out at normal temperatures.
3. method according to claim 1, is characterized in that, in organic solvent washing process, organic solvent is a kind of in technical grade ethyl acetate, n-hexane and carbon tetrachloride.
4. method according to claim 1, is characterized in that, in surfactant washing process, surfactant is a kind of in 1～5% lauryl sodium sulfate and neopelex.
5. method according to claim 1, is characterized in that, in alkali lye cleaned and claims, alkali lye is a kind of in 3～7% NaOH and potassium hydroxide aqueous solution.
6. method according to claim 1, is characterized in that, in acid solution cleaning process, acid solution is a kind of in 3～7% nitric acid, oxalic acid and aqueous citric acid solution.
7. method according to claim 1, is characterized in that, clear water rinsing coordinates in manual back flushing process, manually recoil 2～4 times, and drain time 5～10,1～5 second recoil time, 1～3 minute recoil cycle.
8. method according to claim 1, it is characterized in that, 5～10 minutes organic solvent washing time, surfactant wash time 5～10 minutes, alkali lye scavenging period 20～30 minutes, clear water rinsing time 5～10 minutes, acid solution scavenging period 5～10 minutes, clear water rinsing coordinates 5～10 minutes manual recoil time, electric heating blasting time 20 minutes.
9. method according to claim 1, is characterized in that, the order of whole cleaning process: organic solvent washing, and surfactant washing, alkali lye cleans, clear water rinsing, acid solution washing, clear water rinsing coordinates manually recoil, electric heating air blast.
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| CN201310625308.0A CN103585890A (en) | 2013-11-27 | 2013-11-27 | Cleaning method for silicon carbide membrane used for impurity removal in production of epoxy ester plasticizer |
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| CN201310625308.0A CN103585890A (en) | 2013-11-27 | 2013-11-27 | Cleaning method for silicon carbide membrane used for impurity removal in production of epoxy ester plasticizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548948A (en) * | 2014-12-24 | 2015-04-29 | 哈尔滨工业大学 | Cleaning technology suitable for processing oil recovery waste water polytetrafluoroethylene film |
| CN107935230A (en) * | 2017-10-30 | 2018-04-20 | 中国制浆造纸研究院有限公司 | A kind of composite seal paper machine white water ceramics membrane processing method |
| CN111195484A (en) * | 2020-01-17 | 2020-05-26 | 中国石油天然气股份有限公司 | Surfactant for cleaning plate-type ceramic membrane for oilfield wastewater treatment and cleaning method |
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| CN1837341A (en) * | 2006-03-15 | 2006-09-27 | 江苏久吾高科技股份有限公司 | Cleaning agent for ceramic film and its preparation method |
| CN201978674U (en) * | 2011-04-22 | 2011-09-21 | 吴克宏 | Device used for cleaning and separating waste lubricating oil ceramic membrane |
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2013
- 2013-11-27 CN CN201310625308.0A patent/CN103585890A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1837341A (en) * | 2006-03-15 | 2006-09-27 | 江苏久吾高科技股份有限公司 | Cleaning agent for ceramic film and its preparation method |
| CN201978674U (en) * | 2011-04-22 | 2011-09-21 | 吴克宏 | Device used for cleaning and separating waste lubricating oil ceramic membrane |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548948A (en) * | 2014-12-24 | 2015-04-29 | 哈尔滨工业大学 | Cleaning technology suitable for processing oil recovery waste water polytetrafluoroethylene film |
| CN107935230A (en) * | 2017-10-30 | 2018-04-20 | 中国制浆造纸研究院有限公司 | A kind of composite seal paper machine white water ceramics membrane processing method |
| CN111195484A (en) * | 2020-01-17 | 2020-05-26 | 中国石油天然气股份有限公司 | Surfactant for cleaning plate-type ceramic membrane for oilfield wastewater treatment and cleaning method |
| CN111195484B (en) * | 2020-01-17 | 2022-05-06 | 中国石油天然气股份有限公司 | Surfactant for cleaning plate-type ceramic membrane for oilfield wastewater treatment and cleaning method |
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Application publication date: 20140219 |