CN106540911B - Normal butane method produces the cleaning method of maleic anhydride switching cooler used - Google Patents
Normal butane method produces the cleaning method of maleic anhydride switching cooler used Download PDFInfo
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- CN106540911B CN106540911B CN201510601558.XA CN201510601558A CN106540911B CN 106540911 B CN106540911 B CN 106540911B CN 201510601558 A CN201510601558 A CN 201510601558A CN 106540911 B CN106540911 B CN 106540911B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/06—Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/10—Salts
- C11D7/12—Carbonates bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/261—Alcohols; Phenols
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/32—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/50—Solvents
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- General Chemical & Material Sciences (AREA)
- Detergent Compositions (AREA)
Abstract
The present invention relates to the cleaning method for switching cooler used in normal butane method production maleic anhydride, this method steps are as follows: (1) cleaning agent and solvent are mixed and made into cleaning solution；(2) cleaning solution is heated；(3) cleaning solution after heating is passed through in switching cooler, for cleaning the tar and impurity of switching cooler；(4) tar, impurity and cleaning solution are subjected to sedimentation filtration, recycle tar and impurity and obtain new cleaning agent, repeated step (1) to (4) and recycle cleaning agent；(5) switch cooler with solvent washing, and whether the solution for detecting discharge is up to standard, cleans and finishes if up to standard, repeat step (1) to (5) if it does not meet the standards until up to standard.Upper lower head of the present invention without dismantling switching cooler, greatly reduces cleaning frequency and the workload of cleaning.Cleaning agent can be recycled in the present invention, reduces cleaning cost, reduces environmental pollution.
Description
Technical field
It is cut the present invention relates to used in maleic anhydride production technical field more particularly to the production of normal butane method maleic anhydride
Change the cleaning method of cooler.
Background technique
Maleic anhydride (MAH) is a kind of common basic organic chemical industry raw material, is be only second to phthalic anhydride in the world second largest
Anhydride starting material, and product has quite extensive development and application prospect downstream.Maleic anhydride is widely used in synthetic resin,
Lube oil additive, medicine, food additives, 1,4- butanediol, gamma-butyrolacton, tetrahydrofuran, succinic acid, fumaric acid etc. one
Series important organic chemicals and fine chemicals.
Currently, generally producing maleic anhydride using n butane oxidation method, this method uses vanadium phosphorus oxygen (VPO) caltalyst
System.It is reacted under the conditions of temperature is 400~450 DEG C, reaction, which generates, contains maleic anhydride, acetic acid, acrylic acid, carbon monoxide in gas
And carbon dioxide.Reaction gas is cooling by two-stage cooler, and cooler is cooled down using water.First order cooler is gas cooling
Device, outlet temperature are 270 DEG C, and second-stage cooler is switching cooler, and temperature is 130 DEG C after gas cooling.Switch cooler
Effect be tail gas that cooling maleic anhydride reactor reaction generates, the tar and impurity generated in cooling procedure can be attached to
The tube side inner wall of heat exchanger, influences heat transfer effect.Heat exchanger occurs to switch when tar and impurity adherency in actual production operation
The air flow control valve at cooler rear can gradually be held greatly, and the pressure-control valve in front of maleic anhydride reactor gradually turns down,
To which catalyst bed pressure difference reduces, technique production is influenced.Therefore, switching cooler needs periodic cleaning, and normal production is weekly
Cleaning one, entire washing and cleaning operation period are 5 days.
Conventional cleaning methods high pressure washing water law removes the upper lower head of switching cooler first, then uses high pressure water
Cleaning vehicle device is cleaned.The cleaning equipment is diesel oil high-pressure sewer flushing vehicle, uses desalted water as ejected wash water.Cleaning discharge
Water is expelled to the filtering trough for connecing flushing waste water by the drain valve of bottom, and filtered water is discharged into cesspool.Entire scavenging period
It is 3 days, is easy to produce some dead angles not flushed.In addition, upper lower head need to be returned to dress leak detection after rinsing every time.It tears open
End socket needs 1 day, and dress end socket needs 1 day, and dismounting leak detection workload is very big, and entire periodic needs the used time 5 days, needs to clean 50 every year
Platform need to ask the cleaning troop cleaning of profession, take time and effort.
Chinese patent CN201310129957.1 solve light impurities such as water, acetic acid, propylene in maleic anhydride production and
The problem of heavy seeds of the non-tar of condensable, the patent need to increase the stripping tower that individually designed tower reactor is taper, only solve
It has determined the blocking of follow-up equipment, has not solved asking for the cleaning of switching cooler and blocking for cooling down maleic anhydride reaction gas
Topic.Patent WO2012JP75280 discloses a kind of cleansing composition, and composition includes saturated aliphatic hydrocarbon, ion surface active
Agent, water etc..The cleaning agent of the patent is mainly used in automobile, instrument, electrical electrode clean, does not refer to for switching cooler
Cleaning.
In conclusion the switching cooler how cleaned in maleic anhydride production becomes a technical problem of industry.Cause
This, develops a kind of for switching the cleaning method of cooler in the production of normal butane method maleic anhydride, it appears be of practical significance very much.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide in a kind of production of normal butane method maleic anhydride
Switch the cleaning method of cooler, the cleaning step to solve the cleaning of conventional high-tension water is cumbersome, the period is long, the difficulty of heavy workload
Topic.
The technical solution of the invention is as follows: normal butane method produces the cleaning method of maleic anhydride switching cooler used,
The following steps are included:
(1) cleaning agent is mixed with solvent, is prepared into cleaning solution, cleaning agent used accounts for cleaning solution allotment and obtains
Cleaning solution concentration expressed in percentage by weight be 0.01~10%；
(2) obtained cleaning solution is heated, the temperature after heating is 50~100 DEG C；
(3) cleaning solution after heating is passed through in switching cooler, for cleaning the tar and impurity of switching cooler；
(4) tar, impurity and cleaning solution are passed through settlement filter after cleaning, tar and impurity are through through sedimentation filtration
Removal is collected after effect, cleaning solution obtains new cleaning agent after sedimentation filtration acts on, and repeats step (1) to step (4), follows
Ring uses cleaning agent；
(5) after completing multiple wash cycles, switch cooler with solvent washing, collected by cleaning collecting tank through solvent
The solution of discharge after cleaning, and object ion is sampled and detected to the solution of discharge, if object ion detection is up to standard
Cleaning finishes；If object ion detection is not up to standard, repeatedly step (1) to step (5), until detecting completion cleaning up to standard.
Preferably, the cleaning method of above-mentioned normal butane method production maleic anhydride switching cooler used, in which: described clear
Lotion includes basic component, salt component and solvent composition, and the basic component includes the alkali metal and metal ion that can be dissolved in water,
The salt component includes the alkali metal and metal ion that can be dissolved in water, and the solvent composition is desalted water；Alternatively, being made with desalted water
For cleaning agent.
Further, basic component institute's accounting be 0.01~99.9wt%, salt component institute's accounting be 0.01~
60wt%, solvent composition institute's accounting are 0.01~80wt%, and the sum of the basic component, salt component and solvent composition are 100
wt%；Wherein, the basic component is to contain Na+、K+、Ca2+、Mg2+、Al3+、Zn2+、Fe2+、Fe3+、Ba2+、Pb2+Hydroxide
Object, NH3, hydrazine or the organic base for being dissolved in water, the salt group be divided into containing Na+、K+、Ca2+、Mg2+、Al3+、Zn2+、Fe2+、Fe3+、
Ba2+、Pb2+Or NH4 +Salt.
More preferably, the cleaning method of above-mentioned normal butane method production maleic anhydride switching cooler used, in which: step
(1) in, the solvent is the mixture or desalted water of desalted water or desalted water and methanol and the mixture of ethyl alcohol, the cleaning
Agent is passed through in blending tank with solvent and mixes, and the cleaning solution allotment concentration is 0.1~8%.
More preferably, the cleaning method of above-mentioned normal butane method production maleic anhydride switching cooler used, in which: described
In step (2), cleaning solution is heated by heat exchanger, and the temperature after heating is 70~95 DEG C.
More preferably, the cleaning method of above-mentioned normal butane method production maleic anhydride switching cooler used, in which: described
Step (1) is to step (4) using pump forced circulation.
It is highly preferred that the cleaning method of above-mentioned normal butane method production maleic anhydride switching cooler used, in which: described
In step (5), the summation for the concentration that requirement up to standard is each object ion is detected less than 5/1000000ths.
Present invention substantive distinguishing features outstanding and significant progress are mainly reflected in:
1, cleaning agent of the invention can be recycled by the sedimentation filtration effect of settlement filter, economizes on resources, reduces
Job costs；
2, compared with traditional technology, upper lower head of the present invention without dismantling switching cooler greatly reduces scavenger
The cleaning frequency of work and workload；
3, using the present invention, cleaning solution is recyclable to be recycled, and reduces cleaning cost, the impurity such as tar can be with centralized collection
Processing, avoids direct environment from polluting, and has environmental benefit and social benefit.
Detailed description of the invention
Fig. 1 is the flow diagram of cleaning method of the present invention.
Specific embodiment
Below in conjunction with attached drawing, a specific embodiment of the invention is described in further detail, so that technical solution of the present invention is more
It should be readily appreciated that and grasp.
The present invention proposes the cleaning method for switching cooler in a kind of production of normal butane method maleic anhydride, the cleaning agent of use
Including basic component, salt component and solvent composition, wherein basic component institute's accounting is 0.01~99.9wt%, salt component institute accounting
For 0.01~60wt%, solvent composition institute's accounting is 0.01~80wt%, and the sum of three is 100wt%.
The basic component includes the alkali metal and metal ion that can be dissolved in water, such as contains Na+、K+、Ca2+、Mg2+、Al3+、
Zn2+、Fe2+、Fe3+、Ba2+Or Pb2+Hydroxide, NH3, hydrazine or the organic base for being dissolved in water；The salt component includes can be molten
In the alkali metal and metal ion of water, such as contain Na+、K+、Ca2+、Mg2+、Al3+、Zn2+、Fe2+、Fe3+、Ba2+、Pb2+Or NH4 +'s
Salt, as permanganate, acetate, tungstates, chlorate, hypochlorite, perchlorate, silicate, nitrate, nitrite,
Tartrate, chromate, fluosilicate, carbonate, meta-aluminate, Quadrafos, pyrosulfate, silver dichromate, aluminate, selenium
Hydrochlorate, borate, formates, acetate, sulfate, thiosulfate, halate, halide, cyanide, sulphite and/
Or dianion hydrogen salt and/or trivalent anion one, one or more kinds of compounds of dihydric salt；The solvent
Group is divided into desalted water.When cooler internal contamination is not very high, it can also directly use desalted water as cleaning agent, it is cold to switching
But device is cleaned.
As shown in Figure 1, switching the cleaning method of cooler in normal butane method maleic anhydride production of the present invention, including following several
A step: (1) being passed through blending tank 3 with solvent 2 for the cleaning agent 1 and mix, and is prepared into cleaning solution, cleaning solution allotment
Concentration is 0.01~10%, preferably 0.1~8%；The solvent is desalted water, and methanol or ethyl alcohol allotment can also be added into desalted water
It is used as cleaning solvent 2 later；(2) obtained cleaning solution being heated by heat exchanger 4, the temperature after heating is 50~100 DEG C,
Preferably 70~95 DEG C；(3) cleaning solution heated by heat exchanger 4 is passed through in switching cooler 5, it is cold for cleaning switching
But the tar and impurity adhered in device 5, the tar are the brown of acetic acid, acrylic acid, maleic anhydride polymerization at high temperature
Color dope；(4) tar, impurity and cleaning solution are passed through settlement filter 7 after cleaning, tar and impurity are through sedimentation filtration
It can be recycled and recycle after the effect of 7 sedimentation filtration of device, cleaning solution obtains new cleaning after the effect of 7 sedimentation filtration of settlement filter
The cleaning agent 1 newly obtained is passed through in blending tank 3 again again later and repeats step (1) to step (4) by agent 1, is recycled clear
Lotion 1；(5) after completing multiple wash cycles, switching cooler 5 is rinsed with solvent 2, after collecting cleaning by cleaning collecting tank
Discharge solution, and detection object ion is sampled to the solution of discharge.Detecting requirement up to standard is each object ion
Concentration summation less than 5/1000000ths, clean and finish if object ion detection is up to standard；If object ion detection is not up to standard,
Then repeat the above steps (1) to step (5), until detecting completion cleaning up to standard.In whole process, switching cooler does not need to tear open
Except online wash cycles can be realized in upper lower head.And controlled in the above process using flow control and temperature, cleaning agent it is whole
A cyclic process is using pump forced circulation.
Embodiment 1
Cleaning agent 1 is mixed with solvent 2 in blending tank 3, and prepares the cleaning solution in concentration 2%, and solvent adds through heat exchanger 4
Heat is to switching cooler 5 is entered after 90 DEG C, and cleaning solution through being passed through in blending tank 3 again after 7 sedimentation filtration of settlement filter
It is recycled, circular flow 10t/h.Na in cleaning solution2CO3Accounting 5%, NH3Accounting 2%, ethyl alcohol accounting 6%, remaining is de-
Salt water.Circulation primary 2 hours, circulation was three times.Later, switch cooler using solvent washing, sampled point detects, Na in solvent
Ion concentration is less than 5ppm, shows to switch in cooler and estimate without bur, cleaning finishes.
Embodiment 2
Cleaning agent 1 is mixed with solvent 2 in blending tank 3, and prepares the cleaning solution in concentration 2%, and solvent adds through heat exchanger 4
Heat is to switching cooler 5 is entered after 85 DEG C, and cleaning solution through being passed through in blending tank 3 again after 7 sedimentation filtration of settlement filter
It is recycled, circular flow 10t/h.NaOH accounting 5% in cleaning solution, ethylenediamine accounting 1%, methanol accounting 4%, remaining is
Desalted water.Circulation primary 2 hours, circulation was three times.Later, switch cooler using solvent washing, sampled point detects, in solvent
Na ion concentration is less than 5ppm, shows to switch in cooler and estimate without bur, cleaning finishes.
Embodiment 3
Cleaning agent 1 is mixed with solvent 2 in blending tank 3, and prepares the cleaning solution in concentration 3%, and solvent adds through heat exchanger 4
Heat is to switching cooler 5 is entered after 90 DEG C, and cleaning solution through being passed through in blending tank 3 again after 7 sedimentation filtration of settlement filter
It is recycled, circular flow 10t/h.CH in cleaning solution3COONa accounting 3%, methylamine accounting 1.5%, methanol accounting 3%,
Remaining is desalted water.Circulation primary 2 hours, circulation was three times.Later, switch cooler using solvent washing, sampled point detection is molten
Na ion concentration is less than 5ppm in agent, shows to switch in cooler and estimate without bur, cleaning finishes.
By above description as can be seen that switching the cleaning side of cooler in normal butane method maleic anhydride of the present invention production
Method, cleaning agent can be recycled by the sedimentation filtration effect of settlement filter, economize on resources, reduce costs；Use this
Invention, be adhered to switching cooler in tar and impurity by settlement filter can centralized collection processing, reduce waste water
Discharge, have environmental benefit and social benefit；Compared with traditional technology, up and down envelope of the present invention without dismantling switching cooler
Head greatly reduces cleaning frequency and the workload of cleaning.
Certainly, the above is only a preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, without departing from the technical principles of the invention, can also make several improvements and modification, these improve and
Modification also should be considered as within protection scope of the present invention.
Claims (3)
1. the cleaning method that normal butane method produces maleic anhydride switching cooler used, it is characterised in that: the following steps are included:
(1) cleaning agent is mixed with solvent, is prepared into cleaning solution, cleaning agent used accounts for the clear of cleaning solution allotment acquisition
The concentration expressed in percentage by weight of dilution is 0.01~10%, and the cleaning agent includes basic component, salt component and solvent composition, described
Basic component includes the alkali metal and metal ion that can be dissolved in water, the salt component include can be dissolved in water alkali metal and metal from
Son, the solvent composition are desalted water；Alternatively, use desalted water as cleaning agent, basic component institute's accounting is 0.01~
99.9wt%, salt component institute's accounting are 0.01~60wt%, and solvent composition institute's accounting is 0.01~80wt%, the alkali
Property the sum of component, salt component and solvent composition be 100 wt%, the solvent is the mixture of desalted water or desalted water and methanol,
Or the mixture of desalted water and ethyl alcohol, the cleaning agent is passed through in blending tank with solvent to be mixed, and the cleaning solution allotment is dense
Degree is 0.1~8%；The basic component is to contain Na+、K+、Ca2+、Mg2+、Al3+、Zn2+、Fe2+、Fe3+、Ba2+、Pb2+Hydrogen-oxygen
Compound, NH3, hydrazine or the organic base for being dissolved in water；The salt group is divided into containing Na+、K+、Ca2+、Mg2+、Al3+、Zn2+、Fe2+、Fe3 +、Ba2+、Pb2+Or NH4 +Salt；
(2) obtained cleaning solution is heated, the temperature after heating is 50~100 DEG C；
(3) cleaning solution after heating is passed through in switching cooler, for cleaning the tar and impurity of switching cooler；
(4) tar, impurity and cleaning solution are passed through settlement filter after cleaning, tar and impurity are after sedimentation filtration acts on
Removal is collected, cleaning solution obtains new cleaning agent after sedimentation filtration acts on, and repeats step (1) to step (4), is recycled
Cleaning agent；
(5) after completing multiple wash cycles, switch cooler with solvent washing, collected by cleaning collecting tank and cleaned through solvent
The solution of discharge afterwards, and object ion is sampled and detected to the solution of discharge, it is cleaned if object ion detection is up to standard
It finishes；If object ion detection is not up to standard, repeatedly step (1) to step (5), until detecting completion cleaning up to standard, detection reaches
Target requires the summation of the concentration for each object ion less than 5/1000000ths.
2. the cleaning method of normal butane method production maleic anhydride switching cooler used according to claim 1, feature
Be: in the step (2), cleaning solution is heated by heat exchanger, and the temperature after heating is 70~95 DEG C.
3. the cleaning method of normal butane method production maleic anhydride switching cooler used according to claim 1, feature
Be: the step (1) to step (4) is using pump forced circulation.
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| CN201510601558.XA CN106540911B (en) | 2015-09-18 | 2015-09-18 | Normal butane method produces the cleaning method of maleic anhydride switching cooler used |
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| CN201510601558.XA CN106540911B (en) | 2015-09-18 | 2015-09-18 | Normal butane method produces the cleaning method of maleic anhydride switching cooler used |
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| CN106540911B true CN106540911B (en) | 2019-06-14 |
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| CN108130224B (en) * | 2017-12-20 | 2020-04-14 | 重庆洛昂机械有限公司 | Cleaning method for oil cooler |
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| WO2001092456A1 (en) * | 2000-06-01 | 2001-12-06 | Asahi Kasei Kabushiki Kaisha | Cleaning agent, cleaning method and cleaning apparatus |
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| CN102397855A (en) * | 2011-10-28 | 2012-04-04 | 中国重汽集团济南动力有限公司 | Remanufactured engine oil cooler core cleaning device |
| CN103193739A (en) * | 2013-04-16 | 2013-07-10 | 北京秦唐工程有限公司 | Method for removing heavy and light impurities in maleic anhydride system |
| CN103721970A (en) * | 2013-12-19 | 2014-04-16 | 攀钢集团工程技术有限公司 | Cleaning device and method for cleaning cooler of desulfurization system |
| CN204051048U (en) * | 2014-09-19 | 2014-12-31 | 桐乡恒基生物股份有限公司 | Carry the alcohol distillation column cooling device of wiper mechanism |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001092456A1 (en) * | 2000-06-01 | 2001-12-06 | Asahi Kasei Kabushiki Kaisha | Cleaning agent, cleaning method and cleaning apparatus |
| CN1608708A (en) * | 2003-10-24 | 2005-04-27 | 北京金伟晖工程技术有限公司 | Water soluble solvent vegenerating system and method |
| CN201497421U (en) * | 2009-08-07 | 2010-06-02 | 自贡东方通用能源有限公司 | Cooler on-road cleaning device |
| CN102397855A (en) * | 2011-10-28 | 2012-04-04 | 中国重汽集团济南动力有限公司 | Remanufactured engine oil cooler core cleaning device |
| CN103193739A (en) * | 2013-04-16 | 2013-07-10 | 北京秦唐工程有限公司 | Method for removing heavy and light impurities in maleic anhydride system |
| CN103721970A (en) * | 2013-12-19 | 2014-04-16 | 攀钢集团工程技术有限公司 | Cleaning device and method for cleaning cooler of desulfurization system |
| CN204051048U (en) * | 2014-09-19 | 2014-12-31 | 桐乡恒基生物股份有限公司 | Carry the alcohol distillation column cooling device of wiper mechanism |
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| CN106540911A (en) | 2017-03-29 |
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