CN108865544B - Cleaning agent regeneration method - Google Patents

Cleaning agent regeneration method Download PDF

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Publication number
CN108865544B
CN108865544B CN201810853067.8A CN201810853067A CN108865544B CN 108865544 B CN108865544 B CN 108865544B CN 201810853067 A CN201810853067 A CN 201810853067A CN 108865544 B CN108865544 B CN 108865544B
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CN
China
Prior art keywords
cleaning agent
waste liquid
liquid
regeneration
filtration
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CN201810853067.8A
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Chinese (zh)
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CN108865544A (en
Inventor
方一超
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上海华巅流体分离科技有限公司
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Priority to CN201810853067.8A priority Critical patent/CN108865544B/en
Publication of CN108865544A publication Critical patent/CN108865544A/en
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    • CCHEMISTRY; METALLURGY
    • C11ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D11/00Special methods for preparing compositions containing mixtures of detergents ; Methods for using cleaning compositions
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D11/00Special methods for preparing compositions containing mixtures of detergents ; Methods for using cleaning compositions
    • C11D11/0005Special cleaning and washing methods
    • C11D11/0076Regeneration of cleaning solutions

Abstract

The invention discloses a cleaning agent regeneration method, which comprises the following steps: a precipitation step: obtaining the waste liquid of the cleaning agent used on the production line, and precipitating and layering the waste liquid to obtain a precipitation layer and a floating oil layer on the precipitation layer; oil slick treatment: removing the floating oil layer; and (3) filtering: filtering the cleaning agent waste liquid in the precipitation layer for many times to remove impurities in the cleaning agent waste liquid and obtain impurity waste liquid, emulsifier residual liquid and cleaning agent regenerated liquid semi-finished products; post-treatment: and adding an additive into the semi-finished product of the cleaning agent regenerated liquid to obtain a finished product of the cleaning agent regenerated liquid. According to the cleaning agent regeneration method, the ratio of the quality of the semi-finished product of the cleaning agent regeneration liquid to the quality of the cleaning agent waste liquid is over 90 percent, the recovery and regeneration efficiency of the cleaning agent is high, the service life of the cleaning agent is effectively prolonged, and the service life is prolonged to over 1 year.

Description

Cleaning agent regeneration method

Technical Field

The invention relates to the fields of industrial production, cleaning agent treatment and the like, in particular to a cleaning agent regeneration method.

Background

Surfactants commonly used in industrial cleaners: cationic surfactant/anionic surfactant/amphoteric surfactant/nonionic surfactant, and nonionic surfactants are commonly used in low-foam detergents.

In the industrial production process, the cleaning agent is mainly used for cleaning equipment, and particularly in the automobile production process, parts such as crankshafts, engines and the like need to be cleaned. In the recycling process, impurities such as metal chips, dust and other particles can be mixed, and meanwhile, an emulsifier can be mixed in the cleaning agent. Therefore, in the recycling process of the cleaning agent, the cleaning agent needs to be maintained and managed so as to ensure the normal operation of mechanical equipment and the normal protection of the mechanical equipment.

The existing cleaning agent is maintained after being recycled, the common process is simple, the cleaning agent is only precipitated and then filtered through filter cloth, the aperture of the filter cloth used in the prior art is large and is more than 50um, and therefore the quality of the cleaning agent maintained or treated by the prior art is not high, and the normal utility of the cleaning agent is difficult to achieve. The method ensures that the number of times of the cleaning agent for recycling is not high, and greatly reduces the service life of the cleaning agent. Generally, the service life of the cleaning agent is 1-2 months. After 1-2 months, the surface cleanliness of parts is affected due to excessive sundries, and only new cleaning agents can be discharged and replaced. And the discharged cleaning agent can cause pollution to the environment, which is not beneficial to environmental protection. Although the prior art also has a regeneration method for improving the quality of the cleaning agent, the method generally adopts a distillation method for treatment, and the method has high cost and expensive equipment.

Disclosure of Invention

In order to solve the technical problems, the invention provides a cleaning agent regeneration method, which aims to solve the problems that the cleaning agent in the prior art is short in service life and cannot remove miscellaneous oil/emulsion/fine impurities/bacteria and the like.

The technical scheme for realizing the purpose is as follows: a cleaning agent regeneration method comprises the following steps: a precipitation step: obtaining the waste liquid of the cleaning agent used on the production line, and precipitating and layering the waste liquid to obtain a precipitation layer and a floating oil layer on the precipitation layer; oil slick treatment: removing the floating oil layer; filtering the cleaning agent waste liquid in the precipitation layer for multiple times to remove impurities in the cleaning agent waste liquid and obtain impurity waste liquid, an emulsifier regenerated liquid semi-finished product and a cleaning agent regenerated liquid semi-finished product; post-treatment: and adding an additive into the semi-finished product of the cleaning agent regenerated liquid to obtain a finished product of the cleaning agent regenerated liquid.

Further, the filtering step comprises a coarse filtering step: filtering particulate matters in the cleaning agent waste liquid in the precipitation layer by using a cloth bag; fine filtration: after the coarse filtration step, a vibration filter is adopted to filter particles and emulsifying agents in the cleaning agent waste liquid.

Further, the fine filtering step comprises preliminary filtering: the vibration filter adopts an ultrafiltration membrane, and the diameter of a filter hole of the ultrafiltration membrane is 1nm-100 nm; secondary filtration: the vibration filter adopts a CF-500 grade filter membrane to separate emulsion and cleaning agent to obtain semi-finished products of emulsifier residual liquid and cleaning agent regenerated liquid.

Furthermore, the diameter of the filtering holes on the cloth bag is 8-12 um.

Further, the ultrafiltration membrane is a hydrophilic membrane.

Further, in the fine filtering step, the temperature of the cleaning agent waste liquid is kept between 25 ℃ and 30 ℃.

Further, in the floating oil treatment step, a belt type oil skimmer is adopted to remove floating oil in the floating oil layer.

Further, after the coarse filtration step, a reflux step is also included: and returning part of the cleaning agent waste liquid treated by the coarse filtration step to a production line.

Further, the cleaning agent is an alkaline cleaning agent.

Further, in the post-treatment step, the additive includes at least one of an alkaline additive and a bactericide.

The invention has the advantages that: the cleaning agent regeneration method can effectively remove the impurities such as particulate matters, floating oil and the like in the cleaning agent used in the production line, can separate the emulsion from the cleaning agent, enables various performances of the cleaning agent regeneration liquid to reach the use standard to the maximum extent, enables the ratio of the quality of the semi-finished product of the cleaning agent regeneration liquid to the quality of the cleaning agent waste liquid to be more than 90%, has high recovery and regeneration efficiency of the cleaning agent, effectively prolongs the service life of the cleaning agent, and prolongs the service life to more than 1 year.

Drawings

The invention is further explained below with reference to the figures and examples.

FIG. 1 is a flow chart showing the steps of the cleaning agent regeneration method of example 1 of the present invention.

Detailed Description

The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced.

Example (b): as shown in fig. 1, a cleaning agent regeneration method includes the following steps.

A precipitation step: and (3) obtaining the waste liquid of the cleaning agent used on the production line, and precipitating and layering the waste liquid to obtain a precipitation layer and a floating oil layer on the precipitation layer. In this embodiment, the waste liquid of the cleaning agent used in the production line is specifically put into a precipitation tank for precipitation.

Oil slick treatment: and removing the floating oil layer, wherein in the floating oil treatment step, a belt type oil skimmer is adopted to remove the floating oil in the floating oil layer. The belt type oil skimmer is a mechanical device for recovering oil spilled on the water surface by utilizing a transmission belt, the oil spilled on the water surface is adhered to the transmission belt by the operation of the transmission belt, the oil is guided into an oil collecting tank by a scraping blade, and then the oil is pumped into a storage device by a pump. The oil scraping belt is made of special corrosion-resistant steel and specially designed high polymer materials, and is durable in wear resistance.

And (3) filtering: and filtering the cleaning agent waste liquid in the precipitation layer for multiple times to remove impurities in the cleaning agent waste liquid and obtain impurity waste liquid, emulsifier residual liquid and cleaning agent regenerated liquid semi-finished products. The filtering step comprises a coarse filtering step and a fine filtering step.

In the coarse filtration step, a cloth bag is adopted to filter particles in the cleaning agent waste liquid of the precipitation layer. The diameter of the filtering holes on the cloth bag is 8um-12 um. The diameter of the filtering holes on the common cloth bag is 10 um. If the pore diameter is too large, particulate matters with small diameters are difficult to filter, and cloth covers can be used in a laminated mode to reduce the diameters of the filter pores during specific filtering. The coarse filtration step can be carried out for multiple times, such as three times, and after three times of filtration, the particles with the diameter of more than 10um in the cleaning agent waste liquid can be generally filtered.

Fine filtration: after the coarse filtration step, a vibration filter is adopted to filter particles and emulsifying agents in the cleaning agent waste liquid. Specifically, the fine filtration step comprises primary filtration and secondary filtration. Primary filtering: and filtering particulate matters in the cleaning agent waste liquid by adopting a vibration filter. The vibration frequency of the vibration filter is 75-80Hz, the amplitude is 15-30 mm, and the operation pressure of the vibration film during filtration is 0.1-2.0 MPa. The vibration filter has an ultrafiltration membrane with filtration pores having a diameter of 1nm to 100nm, preferably 40 nm. The smaller the filtration pore of the general ultrafiltration membrane is, the better the impurity removal effect is, but considering the economic factors and the quality requirements of customers for cleaning agents, the diameter of the filtration pore of the general ultrafiltration membrane is only 50 nm. It should be noted that the ultrafiltration membrane described in this embodiment is a hydrophilic membrane, and most of the ultrafiltration membranes are made of acetate fibers or polymer materials with similar performance, and the thickness is generally 0.1mm to 2 mm. The method is most suitable for separating and enriching solute in a processing solution, and is also commonly used for separating colloidal suspension which is difficult to realize by other separation technologies. Therefore, the hydrophilic membrane not only can filter granular impurities in the cleaning agent, but also can further remove floating oil which is not completely removed in the cleaning agent, particularly the part dissolved in water. In the secondary filtration, a CF-500 grade filter membrane is adopted in the vibration filter, the aperture of the CF-500 grade filter membrane is 0.05-1.0um, so as to separate the emulsion and the cleaning agent, and obtain the semi-finished product of the residual emulsifier liquid and the regenerated cleaning agent liquid. Through high-frequency vibration, shear waves are generated on the surface of the membrane, so that impurities in the cleaning agent to be filtered are in a suspended state, meanwhile, the cleaning agent and the emulsion can be further separated, and the impurities and most of the emulsion cannot be precipitated on the surface of the membrane.

In the fine filtration step, the temperature of the cleaning agent waste liquid is kept between 25 ℃ and 30 ℃. Generally, the temperature of the cleaning agent can not exceed 30 ℃, and if the temperature exceeds 30 ℃, certain components in the cleaning agent can volatilize and dissolve, and the stability of the bacteria and the cleaning agent is influenced.

Post-treatment: and adding an additive into the semi-finished product of the cleaning agent regenerated liquid to obtain a finished product of the cleaning agent regenerated liquid. In the post-treatment step, the filtered cleaning agent is firstly detected, and the detection contents comprise the appearance (generally color, transparency and the like), concentration, pH value and the like of the cleaning agent. These detection standards and detection methods are prior art and are not described in detail. And after the detection is finished, adding various additives into the semi-finished product of the cleaning agent regeneration liquid according to the detection result. In the embodiment, the cleaning agent is generally an alkaline cleaning agent, so the additive is also an alkaline additive, that is, if the PH value of the cleaning agent regeneration liquid finished product is found to be acidic, a certain amount of alkaline additive is added into the cleaning agent regeneration liquid finished product according to the PH value, so that the PH value of the emulsifier regeneration liquid finished product meets the requirement. And a bactericide can be further added to remove bacteria and microorganisms in the cleaning agent.

Table 1 shows various test parameters of the cylinder head line cleaning agent regeneration liquid obtained by the cleaning agent regeneration method of the present invention and the cleaning agent during the online use.

Test items Use standard On-line cleaning agent Regenerated cleaning agent Concentration (titration method) 2-4% 0.014 0.0241 Antirust property 2D Is free of Is free of Bacterium (24h) Is free of 10^2 Is free of pH value 9.4-10.5 9.3 10

As can be seen from table 1, the performance of the cleaning agent regeneration liquid obtained by the cleaning agent regeneration method of the present embodiment completely meets the use standard, and the quality of the cleaning agent can be further improved. The ratio of the quality of the semi-finished product of the cleaning agent regenerated liquid obtained by the cleaning agent regeneration method to the quality of the cleaning agent waste liquid is more than 90%, and the recovery and regeneration efficiency of the cleaning agent is high.

Example 2: example differs from example 1 in that after the coarse filtration step, a reflux step is also included: and returning part of the cleaning agent waste liquid treated by the coarse filtration step to a production line. If after the coarse filtration step, the obtained cleaning agent is detected to have various performance standards meeting the use standards, then, in order to reduce the throughput of the subsequent processes, in this embodiment, a part of the cleaning agent after the coarse filtration step may be put into the production line again for reuse. This can save costs and time.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The cleaning agent regeneration method is characterized by comprising the following steps:
a precipitation step: obtaining the waste liquid of the cleaning agent used on the production line, and precipitating and layering the waste liquid to obtain a precipitation layer and a floating oil layer on the precipitation layer;
oil slick treatment: removing the floating oil layer;
and (3) filtering: filtering the cleaning agent waste liquid in the precipitation layer for many times to remove impurities in the cleaning agent waste liquid and obtain impurity waste liquid, emulsifier residual liquid and cleaning agent regenerated liquid semi-finished products;
post-treatment: adding an additive into the semi-finished product of the cleaning agent regenerated liquid to obtain a finished product of the cleaning agent regenerated liquid; the filtration step comprises
A coarse filtration step: filtering particulate matters in the cleaning agent waste liquid in the precipitation layer by using a cloth bag;
fine filtration: after the coarse filtration step, filtering particulate matters and emulsifying agents in the cleaning agent waste liquid by using a vibration filter; the fine filtration step comprises
Primary filtering: the vibration filter adopts an ultrafiltration membrane, and the diameter of a filter hole of the ultrafiltration membrane is 1nm-100 nm;
secondary filtration: the vibration filter adopts a CF-500 grade filter membrane to separate emulsion and cleaning agent to obtain semi-finished products of emulsifier residual liquid and cleaning agent regenerated liquid.
2. The cleaning agent regeneration method according to claim 1, wherein the diameter of the filtration pores on the cloth bag is 8-12 um.
3. The cleaning agent regeneration method according to claim 1, wherein the ultrafiltration membrane is a hydrophilic membrane.
4. The cleaning agent regeneration method according to claim 1, wherein in the fine filtration step, the temperature of the cleaning agent waste liquid is maintained between 25 ℃ and 30 ℃.
5. The cleaning agent regeneration method according to claim 1, wherein in the step of floating oil treatment, a belt type oil skimmer is used to remove floating oil in a floating oil layer.
6. The cleaning agent regeneration method according to claim 1, further comprising, after the rough filtration step, a reflux step of: and returning part of the cleaning agent waste liquid treated by the coarse filtration step to a production line.
7. The cleaning agent regeneration method according to claim 1, wherein the cleaning agent is an alkaline cleaning agent.
8. The cleaning agent regeneration method according to claim 7, wherein in the post-treatment step, the additive includes at least one of an alkaline additive and a bactericide.
CN201810853067.8A 2018-07-30 2018-07-30 Cleaning agent regeneration method CN108865544B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103936205A (en) * 2014-05-13 2014-07-23 大连交通大学 Emulsion recycling, purifying and regenerating equipment and method
CN104176843A (en) * 2014-08-08 2014-12-03 贵阳时代沃顿科技有限公司 Concentration recovery system and method for active ingredients of machining cleaning solution
CN108085120A (en) * 2017-12-21 2018-05-29 北京市通孚精细化工厂 A kind of cutting fluid waste liquid exempts to discharge regenerated environment protecting treatment additive and method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6034701A (en) * 1983-08-04 1985-02-22 Rohm Co Ltd Continuous regeneration apparatus of liquid detergent
CN101148636B (en) * 2006-09-22 2010-09-29 比亚迪股份有限公司 Regenerating method for solvent type liquid crystal cleaning agent

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103936205A (en) * 2014-05-13 2014-07-23 大连交通大学 Emulsion recycling, purifying and regenerating equipment and method
CN104176843A (en) * 2014-08-08 2014-12-03 贵阳时代沃顿科技有限公司 Concentration recovery system and method for active ingredients of machining cleaning solution
CN108085120A (en) * 2017-12-21 2018-05-29 北京市通孚精细化工厂 A kind of cutting fluid waste liquid exempts to discharge regenerated environment protecting treatment additive and method

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