CN111566054A - Improved and environmentally friendly zero-emission treatment process for organic synthesis and specialty chemical industries - Google Patents
Improved and environmentally friendly zero-emission treatment process for organic synthesis and specialty chemical industries Download PDFInfo
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- CN111566054A CN111566054A CN201880072572.7A CN201880072572A CN111566054A CN 111566054 A CN111566054 A CN 111566054A CN 201880072572 A CN201880072572 A CN 201880072572A CN 111566054 A CN111566054 A CN 111566054A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/26—Treatment of water, waste water, or sewage by extraction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
Abstract
The present invention relates to the large-scale production of toxic waste water in liquid, solid or semi-solid form in organic synthesis and specialty chemical industries with various properties of acidic, alkaline, neutral, highly organic and inorganic impurities. The invention provides a simpler, time-saving, money-saving, humanized, safe and environment-friendly improvement method for treating toxic wastewater, is harmless to the environment, and can convert the wastewater into valuable byproducts. The invention can prevent people from being exposed to highly dangerous and virulent environments and also avoids various stages of solid waste generation in the treatment process. In the process of the present invention, the by-product is produced directly from the acidic wastewater, rather than converting the wastewater to a solid waste, which is then treated to recover the by-product. Compared with the prior art, the method also avoids using hydrated lime in the treatment process and provides a simpler treatment method which saves energy, time and cost.
Description
Cross Reference to Related Applications
This application claims priority to indian application No. 201721031771 filed on 2017, 9, 8, of the indian patent office of mungby, incorporated herein by reference in its entirety.
Technical Field
The present invention relates to the large-scale production of toxic waste water in liquid, solid or semi-solid form in organic synthesis and specialty chemical industries with various properties of acidic, alkaline, neutral, highly organic and inorganic impurities. The invention provides a simpler, time-saving, money-saving, humanized, safe and environment-friendly improvement method for treating toxic wastewater, is harmless to the environment, and can convert the wastewater into valuable byproducts.
Background and Prior Art
The organic synthesis and specialty chemical industries are among the largest areas where large-scale production of hazardous and toxic wastewater has been ever reported, including acidic, basic, neutral, highly organic and inorganic impurities. This waste water contains toxic organic compounds, inorganic salts, sulfuric acid and other acidic waste water. These waste waters typically originate from the production of one or more unit operations of an industrial process. If such waste water is not disposed of carefully, it will pose a significant hazard to both human health and the environment. Any improper handling may have an overall impact on human health, animals, marine life, plants, natural water resources and the overall environment.
One of the known prior art processes treats the wastewater by various methods, such as primary treatment, secondary treatment, tertiary treatment and incineration or spray drying to treat the effluent. Finally, the waste is placed into a government approved solid landfill.
Specifically, in the prior art, the wastewater is first treated to remove inorganic salts. The waste water is then neutralized with slaked lime to remove acids in the form of gypsum. The gypsum is filtered off and the filtrate is concentrated, and the concentrated waste water, which is rich in organic compounds and inorganic salts, is incinerated or spray-dried. The incinerated or spray-dried liquid/solid/semi-solid waste is carefully and safely packaged in bags and placed in government approved solid landfills.
Disadvantages of the prior art
In the prior art, the process of treating harmful wastewater generated from organic synthesis and specialty chemical industries involves a lot of manpower. This treatment must be carried out under strict attention. In using prior art processes, there is a need for increased awareness and awareness. In this case, accidents and human errors are likely to occur. Any improper handling can pose a serious health hazard to them.
Personnel involved in such processes must adhere strictly to regulatory guidelines and safety manuals, and carefully adhere to safety instructions at the workplace. Furthermore, despite strict adherence to regulatory guidelines, there is still a possibility of long-term risk to their health.
In the prior art, the raw material, hydrated lime, is used to neutralize the acid from the wastewater. This requires filtration to remove the acid in the form of gypsum, which is a solid waste.
In the prior art, after neutralization, the neutral filtrate is evaporated using "multieffect" and "forced circulation". The concentrated wastewater is spray-dried or incinerated to obtain solid waste. Finally, the solid waste is carefully and safely contained in bags and released to government approved solid landfills.
In addition, safety regulations and guidelines have been applied by the respective government authorities for the treatment of wastewater produced by organic synthesis and specialty chemical industries. Therefore, these wastewaters must be rigorously treated, disposed of and disposed of to approved landfills. The wastewater is finally converted into liquid/solid/semi-solid waste through special treatment and is thrown into a solid landfill approved by the government.
However, liquid/solid/semi-solid waste comprises toxic waste water with various properties, such as acidic, alkaline, neutral, highly organic and inorganic impurities. In case of natural disasters such as earthquakes and floods, the safely handled solid landfill may be damaged, resulting in water seepage. The solid/semi-solid waste dissolves in the water, regenerating the toxic waste water described above. Wastewater can contaminate ground water levels, resulting in large scale highly contaminated water.
However, the entire process of safely treating wastewater is both expensive and energy consuming, again affecting the environment.
In another closest prior art, acidic wastewater from a plant is treated in various steps including crystallization, evaporation, spray drying, carbonization, separation of inorganic salts and carbon, distillation of water, belt filtration process.
The prior art mainly performs three main tasks.
Carbonization of solid waste
Recovery of carbon from carbonaceous powders
Recovery of inorganic salts
In the prior art, the crystallization process does not contribute to the overall recovery of the inorganic salts. In addition, a part of the recovered inorganic salts is reused and is not good in quality.
Useful by-products are recovered from the solid waste during the treatment of the various steps of the prior art. All of these steps involve constant exposure of people to highly dangerous and highly toxic environments. In all of these steps of the closest prior art, humans must work in hazardous and toxic environments.
Furthermore, all these steps of the prior art are high in manpower usage, energy consumption, capital and repetition costs.
The solution provided by the invention
In the prior art, hazardous waste water is converted into a solid/powder form, which still contains hazardous substances. Such hazardous solids/powders are subjected to various steps from which the by-products are ultimately recovered.
The present invention prevents human exposure to highly hazardous and toxic environments and eliminates various stages of solid waste generation during processing. In the process of the present invention, the by-product is produced directly from the acidic wastewater, rather than converting the wastewater to a solid waste which is then treated to recover the by-product.
The method of the present invention simply avoids the various stages of solid waste generation and recovers high quality by-products while having a labor-safe working environment.
Saving energy and raw materials
In the prior art, the waste water is neutralized by using slaked lime. The neutralized wastewater is treated by multiple-effect evaporation or forced circulation evaporation. Even after evaporation, the material still contained a small amount of water. Finally, the remaining water was removed from the solid material by a spray dryer. The remaining material still contains organic and inorganic materials.
In the present invention, the wastewater is directly treated by evaporation in the initial step of the treatment and converted into powder/semi-solid. Thus, the process of the present invention avoids the spray drying process. Moreover, the present invention avoids the use of hydrated lime during the treatment process.
Object of the Invention
The invention mainly aims to provide a zero-emission treatment method which is used in organic synthesis and special chemical industry, is friendly to human beings, saves cost, is safe and improved, and is environment-friendly.
The object of the present invention consists in providing an improved method for treating waste water which contributes to saving natural resources.
The object of the invention consists in avoiding the use of slaked lime in the treatment process. Compared with the prior art, a simpler, energy-saving, time-saving and more convenient treatment method is provided.
The object of the present invention includes the recovery of sodium sulfate from hazardous waste water.
The object of the present invention consists in eliminating the need for a spray dryer during the treatment as required in the prior art.
The object of the invention consists in protecting the environment from the harmful effects of toxic waste waters having various characteristics. The toxic wastewater has characteristics such as acidity, alkalinity, neutrality, high organic impurities and inorganic impurities generated in organic synthesis and specialty chemical industries.
The object of the present invention consists in destroying the toxicity of organic and inorganic compounds present in the wastewater.
The invention also aims to overcome the risk of environmental hazard caused by natural disasters such as earthquake, flood and the like.
Solid/semi-solid waste from a safely disposed landfill may dissolve in water, thereby generating the above-mentioned toxic wastewater.
The object of the present invention consists in eliminating the above mentioned toxic liquid/solid/semi-solid waste products produced by the organic synthesis and specialty chemical industries. The present invention avoids the above-mentioned toxic waste being thrown into a landfill. And these lands may be used for agriculture, housing and other general purposes.
The object of the present invention consists in simplifying the waste management operations formally implemented in the organic synthesis and specialty chemistry industries. From the factory to the landfill, waste management is very complicated, requiring multiple operations to be performed. Furthermore, the present invention will save costs associated with wastewater treatment processes, including various costs of transportation, labor, handling, packaging, disposal, and the like.
It is also an object of the present invention to convert waste streams into useful by-products and to benefit from valuable by-products. At the end of the treatment process according to the invention, some by-products are recovered, including carbon, inorganic salts and mother liquors containing inorganic salts.
Description of the invention
The invention provides a wastewater treatment method which is friendly to human, saves time and is cost-effective. It can also protect the environment from large-scale harmful wastewater, further contributing to the protection of natural resources. The process of the present invention will simplify the treatment of liquid/solid/semi-solid waste, i.e. toxic waste water produced in the organic synthesis and specialty chemical industries, i.e. having various properties of acidic, alkaline, neutral, highly organic and inorganic impurities.
The present invention uses an improved process to convert toxic wastewater into an environmentally friendly valuable byproduct and will protect the environment in various ways.
In particular, in the improved process of the present invention, the wastewater is treated through various steps including evaporation, carbonization, soaking, filtration, evaporation and separation of the final by-products.
Detailed Description
The present invention relates to the large-scale production of toxic waste water in liquid, solid or semi-solid form in organic synthesis and specialty chemical industries with various properties of acidic, alkaline, neutral, highly organic and inorganic impurities. The present invention relates to an improved method for treating and rendering environmentally benign the aforementioned toxic wastewater. Moreover, this waste water is converted into valuable by-products.
In addition, the improved process avoids the use of slaked lime in the process and the need for a spray dryer.
The present invention provides a simpler, energy-saving, time-cost and more convenient treatment method, while recovering inorganic salts from harmful waste water.
The method of the present invention mainly performs the following main tasks.
-evaporation of the acidic waste water;
-carbonization of concentrated wastewater;
-immersing the carbonized substance in water;
-separating the carbon and the salts;
-drying the inorganic salt and the carbon.
Step-1 collecting toxic substances
Acidic, neutral and alkaline mother liquors from organic synthesis and specialty chemical industries are collected from a production area. The waste water, in acidic, neutral or any other liquid form, is stored in tanks.
Step-2 distillation
In this step, water is distilled and recovered from the waste water. The recovered distilled water may be used in step 5 of the present process or in a plant process.
Step-3 recovery after distillation
Step 2 the remaining after distillation is a semi-solid mass.
Step-4 carbonization of the semi-solid substance
In the non-reactive gas nitrogen "N2"in the presence of the carbon-containing substance, the carbonaceous substance is carbonized in a heating chamber at a temperature of 200 ℃ to 2000 ℃ for 2 to 6 hours. In this step, the mixture of carbonaceous materials is converted into carbon and inorganic salts by the above-described heating process.
Step 5 soaking in Water
Carbonaceous material containing carbon and inorganic salts is immersed in water at a temperature of 80 ℃ to 100 ℃.
Step-6 filtration
Salt and carbon immersed in water have different properties. The salt has the property of being soluble in water at a given temperature, whereas the carbon is insoluble in water.
At the end of this step, the wastewater mixture was divided into two parts using a filter press. The inorganic salts are isolated in liquid form by dissolution in water. The carbon is isolated in solid form. After drying it was converted to a powder.
Step-7 distillation
Finally, the water containing inorganic salts from step 6 is treated by distillation. Two alternative methods of distilling water are used herein, namely "multiple effect evaporation" and "forced circulation". In this step, 50% to 70% of the distilled water will be recovered. The distilled water can be reused as in step 5 above or in a plant process.
Step-8 filtration
The residue of step 7 was an inorganic salt in the form of a thick mixture. In this step, the concentrated material is cooled and filtered. Filtration will separate the inorganic salts as well as the mother liquor used in the plant.
The recovered inorganic salts are pure and moist.
Step-9 drying
The recovered is wet inorganic salt, which will change to a dry powder over time.
Drawings
FIG. 1: represents an improved, environmentally friendly, zero-solids discharge treatment process for use in organic synthesis and specialty chemical industries.
Detailed description of the drawings
FIG. 1: represents an improved, environmentally friendly, zero-solids discharge treatment process for use in organic synthesis and specialty chemical industries.
Comprising collecting the waste water/toxic substances in liquid form, i.e. "acidic, neutral and alkaline mother liquor" (1), and storing it in a tank. Distilled water and recovered from the waste water (2). After distillation, the carbonaceous material remains in the semi-solid form (3). It is heated at 200-2000 deg.C in non-reactive gas nitrogen "N2"carbonizing (4) in the presence of" for 2 to 6 hours. It converts carbonaceous material into carbon and salts. The mixture of carbon and salt is immersed in water at a temperature of 80-100 ℃ (5). Since the salt is soluble in water, it will be separated using filtration method (6), while the carbon will be separated as a wet solid. Two alternative methods are used to distill the saline water (7) 'multiple effect evaporation' and 'forced circulation evaporation'. In this step, 50% to 70% of the distilled water will be recovered. After water distillation, the remaining material is an inorganic salt in the form of a thick liquid. Water is separated from the thick liquid using filtration step (8) and finally white inorganic salts are recovered. The water separated after the filtration process, i.e. the mother liquor, is reused in the plant process. The recovered inorganic salt is dried (9).
Claims (12)
1. A method for recovering carbon and inorganic salts from organic intermediates and specialty chemical wastewater comprising the steps of:
collection of acidic, neutral and alkaline mother liquors in organic synthesis and in particular chemical industries;
distilling off water and separating off carbonaceous material from the waste water;
carbonization of carbonaceous material;
immersing the carbonaceous material in water;
filtering the carbon from the inorganic salt solution;
distilling off water from the inorganic salt solution;
inorganic salt filtration;
carbon and inorganic salt drying.
2. The method for treating wastewater according to claim 1, wherein the distilled carbonaceous material is solid, semi-solid or powdery.
3. The method of treating wastewater according to claim 1, wherein the nitrogen "N" is a non-reactive gas2"the carbonaceous material is converted into carbon and inorganic salts by carbonization in a heating chamber at a temperature of 200 ℃ to 2000 ℃ for 2 to 6 hours in the presence of oxygen.
4. A method for treating wastewater according to claim 1, wherein the carbonized mixture of carbon and inorganic salt is immersed in water at a temperature of 80 ℃ to 100 ℃, and the inorganic salt in the mixture is dissolved in the water.
5. The wastewater treatment method according to claim 1, wherein the carbonized liquid mixture of carbon and salt is treated by a filter press to filter and separate carbon and salt, wherein carbon is separated in a solid state and salt is separated in a liquid state.
6. A method of treating waste water as claimed in claim 1, wherein the liquefied salt is treated by "multiple effect evaporation" to recover and distill 50% -70% of the water from the liquefied salt, the liquefied salt is thickened and still contains 30% -50% of the water, and the distilled water can be reused in the plant process.
7. A method of treating waste water as claimed in claim 1, wherein the liquefied salt is treated by "forced circulation" to recover and distill 50% -70% of the water from the liquefied salt, the liquefied salt is thickened and still contains 30% -50% of the water, and the distilled water can be reused in the plant process.
8. A process for the treatment of waste water as claimed in claim 1, wherein the thick liquefaction salts are cooled and filtered to recover inorganic salts and separated water which can be reused in the plant process.
9. In the wastewater treatment method according to claim 1, the carbonaceous matter is converted into carbon and salts due to carbonization in the presence of a non-reactive gas in a heating chamber at 200 ℃ to 2000 ℃.
10. The method for treating waste water according to claim 1, characterized in that the waste water is reusable in the treatment process.
11. The wastewater treatment method according to claim 1, wherein the wastewater is directly treated by distillation and converted into powder/semi-solid in the initial step of the treatment, thereby avoiding the spray drying process.
12. The wastewater treatment process of claim 1 produces useful by-products directly from acidic wastewater, thereby avoiding various stages of solid waste production and eliminating the need for slaked lime as a processing material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN201721031771 | 2017-09-08 | ||
| IN201721031771 | 2017-09-08 | ||
| PCT/IN2018/050525 WO2019049166A1 (en) | 2017-09-08 | 2018-08-11 | An improved & environment friendly zero discharge treatment used in organic synthesis & speciality chemical industries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111566054A true CN111566054A (en) | 2020-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880072572.7A Pending CN111566054A (en) | 2017-09-08 | 2018-08-11 | Improved and environmentally friendly zero-emission treatment process for organic synthesis and specialty chemical industries |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111566054A (en) |
| WO (1) | WO2019049166A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1267950A (en) * | 1968-11-29 | 1972-03-22 | Texaco Development Corp | Treatment of industrial wastes |
| CN102408169A (en) * | 2010-12-09 | 2012-04-11 | 宜兴阳源环境工程有限公司 | Organic wastewater treatment method |
| CN103708572A (en) * | 2014-01-09 | 2014-04-09 | 山东潍坊润丰化工股份有限公司 | Resourceful treatment method for inorganic salts in industrial waste water |
| CN104030509A (en) * | 2014-06-18 | 2014-09-10 | 泰兴锦汇化工有限公司 | Treatment method of wastewater during production of acid H taken as dye intermediate |
| WO2016193992A1 (en) * | 2015-05-29 | 2016-12-08 | Ambuja Intermediates Ltd | A novel and environment friendly "zero solid discharge" treatment used in dyes and dyes intermediate industries |
-
2018
- 2018-08-11 CN CN201880072572.7A patent/CN111566054A/en active Pending
- 2018-08-11 WO PCT/IN2018/050525 patent/WO2019049166A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1267950A (en) * | 1968-11-29 | 1972-03-22 | Texaco Development Corp | Treatment of industrial wastes |
| CN102408169A (en) * | 2010-12-09 | 2012-04-11 | 宜兴阳源环境工程有限公司 | Organic wastewater treatment method |
| CN103708572A (en) * | 2014-01-09 | 2014-04-09 | 山东潍坊润丰化工股份有限公司 | Resourceful treatment method for inorganic salts in industrial waste water |
| CN104030509A (en) * | 2014-06-18 | 2014-09-10 | 泰兴锦汇化工有限公司 | Treatment method of wastewater during production of acid H taken as dye intermediate |
| WO2016193992A1 (en) * | 2015-05-29 | 2016-12-08 | Ambuja Intermediates Ltd | A novel and environment friendly "zero solid discharge" treatment used in dyes and dyes intermediate industries |
Non-Patent Citations (1)
| Title |
|---|
| 侯嫔等: "《水处理过程化学》", 31 May 2015, 冶金工业出版社 * |
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| Publication number | Publication date |
|---|---|
| WO2019049166A1 (en) | 2019-03-14 |
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