CN109534534B - Method and device for treating sulfonated waste sulfuric acid in detergent production - Google Patents
Method and device for treating sulfonated waste sulfuric acid in detergent production Download PDFInfo
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- 239000002699 waste material Substances 0.000 title claims abstract description 62
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 239000003599 detergent Substances 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000002253 acid Substances 0.000 claims abstract description 50
- 238000000926 separation method Methods 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 230000003068 static effect Effects 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 239000003513 alkali Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000004062 sedimentation Methods 0.000 claims abstract description 16
- 238000003860 storage Methods 0.000 claims abstract description 16
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 9
- 239000010865 sewage Substances 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 6
- 239000012629 purifying agent Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 238000010669 acid-base reaction Methods 0.000 claims description 3
- 239000002585 base Substances 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 238000010790 dilution Methods 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 abstract description 14
- 230000008901 benefit Effects 0.000 abstract description 11
- 239000002994 raw material Substances 0.000 abstract description 11
- 238000005406 washing Methods 0.000 abstract description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 230000003472 neutralizing effect Effects 0.000 abstract 1
- 238000012958 reprocessing Methods 0.000 abstract 1
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 8
- 238000005507 spraying Methods 0.000 description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 6
- 229960004887 ferric hydroxide Drugs 0.000 description 6
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical group [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 6
- 239000013049 sediment Substances 0.000 description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 description 6
- 235000011152 sodium sulphate Nutrition 0.000 description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 5
- 238000010306 acid treatment Methods 0.000 description 5
- 238000006277 sulfonation reaction Methods 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000012797 qualification Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 238000001694 spray drying Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000000271 synthetic detergent Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KWKXNDCHNDYVRT-UHFFFAOYSA-N dodecylbenzene Chemical compound CCCCCCCCCCCCC1=CC=CC=C1 KWKXNDCHNDYVRT-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- HIFJUMGIHIZEPX-UHFFFAOYSA-N sulfuric acid;sulfur trioxide Chemical compound O=S(=O)=O.OS(O)(=O)=O HIFJUMGIHIZEPX-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/16—Purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a method for innocuous treatment of sulfonated waste sulfuric acid in detergent production, which comprises neutralizing waste acid containing rust generated in washing powder production with alkali in a static reaction mixer, and reusing or reprocessing the product after oxidation and sedimentation. The device comprises a static reaction mixer, wherein one end of the static reaction mixer is provided with a water inlet and an acid inlet, the middle part of the static reaction mixer is provided with an alkali inlet, the other end of the static reaction mixer is provided with a material outlet, the material outlet is communicated to a liquid inlet of a separation settler through a pipeline, and a pH meter is arranged at the liquid inlet of the separation settler; the water inlet, the acid inlet and the alkali inlet are respectively communicated with a clean water storage tank, a waste acid storage tank and a liquid alkali storage tank through respective metering pumps; the metering pump and the pH respectively are connected to an automatic control system. The invention not only realizes innocent treatment of waste acid and changes waste into valuable, but also can save raw materials and reduce production cost, and has obvious economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of synthetic detergent production, and particularly relates to a method and a device for treating sulfonated waste sulfuric acid in detergent production.
Background
At present, alkylbenzene sulfonic acid (called sulfonic acid for short) commonly used in the domestic synthetic detergent industry is generally produced by a sulfur trioxide film type sulfonation device. The basic process comprises the following steps: sulfur dioxide is generated by burning sulfur, sulfur dioxide is catalyzed and oxidized to generate sulfur trioxide, and the sulfur trioxide and dodecylbenzene are subjected to sulfonation reaction in a multi-tube membrane type sulfonator in a downstream manner to generate dodecylbenzene sulfonic acid. Sulfonic acid is one of the most main raw materials for producing washing powder and liquid detergents, but in the production process, as the dried process air contains trace moisture, sulfur trioxide is discharged from a conversion tower and passes through a two-stage cooler to form a small amount of waste fuming sulfuric acid (waste acid for short) containing rust, and a gas filter in front of a sulfonator also filters out a small amount of waste acid, so that the waste acid belongs to dangerous wastes and must be treated by corresponding qualification units according to the national regulations for dangerous wastes.
The traditional method for treating waste acid is as follows: the collected spent acid is sold as waste to the relevant user or to units with hazardous waste disposal qualifications. The method is carried out according to the management regulations of dangerous chemicals in the processes of waste acid collection, loading, unloading, transportation and use, has higher danger, and the current users are less and less, the difficulty of waste treatment is increased, and the treatment cost is higher and higher by units with dangerous waste treatment qualification.
Powder spraying workshops for producing washing powder usually adopt a high-tower spray drying process, which requires that various solid raw materials, liquid raw materials and process water are mixed to prepare slurry, and then spray drying is carried out by a high-pressure pump and a powder spraying tower to produce the washing powder, wherein the raw materials in the ingredients comprise a large amount of sodium sulfate and process water. If the sulfonated waste acid is neutralized by a proper process device, the sulfonated waste acid is converted into sodium sulfate and clear water, the sulfonated waste acid can be directly used in the batching production of washing powder, so that not only is the harmless treatment of the waste acid realized, but also the waste acid is changed into valuable, the raw materials of sodium sulfate and tap water can be saved, the production cost is reduced, and the economic and social benefits are remarkable.
The invention comprises the following steps:
the first object of the invention is: the method can be used for carrying out innocent treatment on the waste sulfuric acid generated in the production process of the washing powder, and the obtained treated product is reused in the production, so that the raw material consumption and the waste emission are reduced, and the method has obvious economic benefit and social benefit.
The second object of the invention is: the device has reasonable design, simple process equipment and easy operation and control, can carry out harmless treatment on the waste sulfuric acid generated after sulfonation, and the treated product can be used as a raw material for production so as to achieve the aim of clean production.
The production principle of the invention is as follows:
waste acid generated in the production process of dodecylbenzene sulfonic acid (called sulfonic acid for short) which is one of main raw materials in washing powder enters a static mixing reactor, is diluted by water, is neutralized by liquid alkali, then enters a separation settler, is subjected to air oxidation and gravity sedimentation separation, and then the obtained main product (clear water dissolved with sodium sulfate) is used as raw material of a powder spraying workshop to be reused in production. The main component in the sediment is ferric hydroxide, and the sediment can be used as a water purifying agent for sewage purification in sewage treatment stations. The whole treatment process is safe, does not generate new harmful substances, and is a harmless treatment process.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for treating sulfonated waste sulfuric acid in detergent production comprises the following steps:
a. waste acid dilution: introducing clear water into a static mixing reactor, and adding seven to five percent of waste acid according to the flow of the water;
b. acid-base neutralization: adding quantitative sodium hydroxide into the static mixing reactor, wherein the adding amount of the sodium hydroxide is quantitative according to the numerical value of a pH meter arranged at the rear of the process flow;
c. oxidizing and settling: oxidizing and settling the acid-base reaction product;
d. and (3) utilizing a product: and recycling the settled clear liquid into production or discharging the settled clear liquid after sewage treatment, and sending the settled clear liquid to a sewage treatment station to be used as a water purifying agent.
Preferably, the addition amount of the waste acid in the step a is six percent of the clear water content.
Preferably, the clean water in the step a can be partially discharged by circulating cooling water in the sulfonation workshop, so that tap water can be saved, and the purpose of saving water is achieved.
Preferably, the pH meter in the step b is controlled to be in a range of 7.0 to 8.0.
Preferably, in the step c, the oxidation and sedimentation are performed in a separation and sedimentation device, and a pH meter is arranged at a water inlet in the separation and sedimentation device, and the sedimentation time is 20-24 hours.
The sulfonated waste sulfuric acid treatment device in the production of the detergent comprises a static mixing reactor, wherein one end of the static reaction mixer is provided with a water inlet and an acid inlet, the middle part of the static reaction mixer is provided with an alkali inlet, the other end of the static reaction mixer is provided with a material outlet, the material outlet is communicated to a separation settler through a pipeline, and a pH meter is arranged in the separation settler; the water inlet, the acid inlet and the alkali inlet are respectively communicated with a clean water storage tank, a waste acid storage tank and a liquid alkali storage tank through respective metering pumps; the metering pump and the pH respectively are connected to an automatic control system.
Preferably, the static reaction mixer is a multistage static reaction mixer, the shell of the static reaction mixer is a circular cylinder, a plurality of baffle layers which are sequentially arranged are arranged in the cylinder at intervals, each baffle layer consists of three groups of baffle plates, each group of baffle plates consists of three plates which are mutually at 90 degrees, the sharp angle of each baffle plate is positioned on the axial lead of the cylinder, and the end which is opposite to the cylinder and is provided with a water inlet is arranged on the cylinder; the adjacent two groups of baffle plates (shown in figures 3 and 4) are staggered at 60 degrees; the interval between every two baffle layers is 200-300 mm, and every two adjacent baffle layers in the axial direction are staggered at 30 degrees (as shown in figures 3 and 4); the water inlet and the material outlet are respectively arranged at the center positions of the shafts at the two ends of the cylinder body; the acid inlet is arranged on the outer side wall of one end of the water inlet of the cylinder body, the alkali inlet is arranged on the outer side wall of the middle position of the cylinder body, and the acid inlet and the alkali inlet are arranged on the outer wall of the same side of the cylinder body and are both upward in direction. The cylinder and the baffle plate inside the cylinder can be made of stainless steel (316L) or glass fiber reinforced plastic or carbon steel lining fluorine corrosion-resistant materials.
Preferably, the separation settler is a rectangular water tank with the length, width and height of 12-20 meters, 1.2-1.5 meters and 0.8-1.2 meters and an upper opening, 3-5 compartments are arranged at equal intervals in the separation settler, a liquid inlet and a liquid outlet are respectively arranged at the edges of two ends of the separation settler, a pH meter is arranged at the liquid inlet, the liquid outlet is communicated with a water pipe (the water pipe is provided with a tee joint, a related valve and a metering pump, and liquid is conveyed to a powder spraying workshop or a sewage treatment plant for treatment) through a water pump, the bottoms of the compartments of the separation settler are mutually communicated, and a clean outlet (used for discharging sediment ferric hydroxide) is arranged at the bottoms of the compartments between the liquid outlets; the upper part of the separation settler is provided with a safety net for covering.
Preferably, each compartment of the separation settler is internally provided with a disc-shaped air charging pipe, the air charging pipe is provided with a plurality of exhaust holes, the air charging pipe is communicated with an air compressor outside the separation settler, and the air compressor is connected to an automatic control system. By periodically replenishing the liquid in the separation settler with air, the oxidation of sodium sulfite and ferrous hydroxide in the separation settler can be accelerated, converting them into sodium sulfate soluble in water and ferric hydroxide insoluble in water.
Preferably, the automatic control system is a PLC automatic control system.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the static reaction mixer has a circular cylinder body in the appearance structure, a multi-section baffle plate structure (90 degrees of baffle plates are staggered between 60 degrees of baffle plates and 30 degrees of baffle plate layers are staggered between the baffle plates) is arranged in the reactor, and different feed inlets are arranged at different positions, so that materials are fully mixed and reacted in the mixer through flow stirring, different materials are added at different stages according to requirements, the reaction is complete, and through multistage mixing reaction, alkali liquor fully mixes with waste acid to thoroughly convert waste sulfuric acid which is dangerous chemical difficult to store and transport into safe valuable materials which can be directly utilized by the next procedure;
2. the method can treat the waste acid generated in the sulfonation process through a closed and safe process system, avoids potential safety hazards and environmental pollution in the transportation, storage and transportation of hazardous chemicals such as waste sulfuric acid, and simultaneously recycles the treated materials, thereby playing a role in saving energy and reducing consumption;
3. compared with the existing common waste acid treatment method, the invention has the following effects: the process equipment is simple, the operation and control are convenient, the danger of the original waste acid collecting and treating process is eliminated, and the clean production requirement is met. By using the method and the device, the waste acid can be subjected to innocent treatment, waste is changed into valuable, the purposes of pollution reduction and efficiency improvement are achieved, the method and the device are beneficial to technical progress of the same industry after popularization and application, and obvious economic benefit and social benefit are achieved;
4. the sediment of the invention is directly sent to a sewage treatment station to be used as a water purifying agent because of the high content of ferric hydroxide.
In a word, the process equipment is simple, is convenient to operate and control, eliminates the danger of the original waste acid collecting and treating process, and meets the requirement of clean production; not only can harmless treatment on waste acid be realized, waste materials are changed into valuable materials, but also raw materials can be saved, the production cost is reduced, and the method has remarkable economic and social benefits.
Drawings
FIG. 1 is a flow chart of a process according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the static reaction mixer of the present invention;
FIG. 3 is a cross-sectional side view of a static reaction mixer A-A of the present invention;
FIG. 4 is a cross-sectional side view of a static reaction mixer B-B according to the invention;
wherein, 1-static reaction mixer; 101-a cylinder; 102-baffle layer; 103-baffles; 2-a water inlet; 3-an acid inlet; 4-an alkali inlet; 5-a material outlet; 6-separating and settling device; 7-pH meter; 8-a metering pump; 9-a clean water storage tank; 10-a waste acid storage tank; 11-a liquid alkali storage tank; 12-an automatic control system; 13-a powder spraying workshop; 14-cleaning the mouth.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples:
embodiment one:sulfonated waste sulfuric acid treatment device in detergent production
The sulfonated waste sulfuric acid treatment device in the production of the detergent comprises a static reaction mixer 1, wherein one end of the static reaction mixer 1 is provided with a water inlet 2 and an acid inlet 3, the middle part is provided with an alkali inlet 4, the other end is provided with a material outlet 5, the material outlet 5 is communicated with a separation settler 6 through a pipeline, and a pH meter 7 is arranged in the separation settler 6; the water inlet 2, the acid inlet 3 and the alkali inlet 4 are respectively communicated with a clean water storage tank 9, a waste acid storage tank 10 and a liquid alkali storage tank 11 through respective metering pumps 8; the metering pump 8 and the pH meter 7 are each connected to an automatic control system 12.
The static reaction mixer 1 is a multistage static reaction mixer, the shell of the static reaction mixer is a circular cylinder 101, a plurality of baffle layers 102 which are sequentially arranged are arranged in the cylinder 101 at intervals, each baffle layer 102 is composed of three groups of baffle plates 103, each group of baffle plates 103 is composed of three plates which are mutually at an angle of 90 degrees (one of the plates is connected with the middle parts of the other two plates and plays a supporting role), and the sharp angle of the baffle plates is positioned on the axial lead of the cylinder and is opposite to the water inlet; adjacent two groups of baffle plates 103 (see fig. 3 and 4) are staggered at 60 degrees; the interval between each baffle layer 102 is 200-300 mm, and the two axially adjacent baffle layers 102 are staggered at 30 degrees (see figures 3 and 4); the water inlet 2 and the material outlet 5 are respectively arranged at the central positions of shafts at two ends of the cylinder 101; the acid inlet 3 is arranged on the outer side wall of one end of the cylinder water inlet 2, the alkali inlet 4 is arranged on the outer side wall of the middle position of the cylinder 101, and the acid inlet 3 and the alkali inlet 4 are arranged on the outer wall of the same side of the cylinder 101 and are upward in direction. The cylinder 101 and its internal baffle plate can be made of stainless steel (316L), glass fiber reinforced plastic or carbon steel with fluorine lining.
5 compartments (not shown) are arranged at equal intervals in the separation settler 6, two ends of the separation settler are respectively provided with a liquid inlet (not shown) and a liquid outlet (not shown), the liquid inlet is provided with a pH meter 7, the liquid outlet is communicated with a water pipeline through a metering pump 8, and the water pipeline is also provided with the metering pump and is communicated with a powder spraying workshop 13; the compartments are separated by a movable flow separation plate (not shown), the bottoms of the compartments of the separation settler 6 are communicated with each other, and a clean-out port 14 (for discharging sediment ferric hydroxide) is arranged at the bottom of each compartment between the liquid outlet ends; the upper part of the separation settler 6 is open and covered with a safety net.
Embodiment two:innocent treatment of sulfonated spent sulfuric acid
a. Waste acid dilution: introducing clear water into a static mixing reactor, and adding six percent of waste acid according to the flow of the water;
b. acid-base neutralization: quantitative sodium hydroxide is added through an alkali inlet in the middle of the static mixing reactor, the adding amount of sodium hydroxide is quantitative according to the value of a pH meter in a separation settler, and the pH value is maintained at 7.5;
c. oxidizing and settling: introducing the acid-base reaction product into a separation settler for oxidation and sedimentation, and controlling the flow of liquid to ensure that the oxidation and sedimentation time of the liquid in the separation settler is 20-24 hours;
d. and (3) utilizing a product: and recycling the clear liquid obtained after sedimentation into the production of a powder spraying workshop, and conveying the sediment to a sewage treatment station to be used as a water purifying agent.
Counting a set of 3.8t/h sulfonic acid production device, according to the change of environmental temperature all the year round, the production amount of waste acid is different, more summer and less winter, and about 40t of waste sulfuric acid is produced each year. After innocuous treatment by the method and the device of the invention, 58t of sodium sulfate and 2.4 ten thousand m of recycled clean water can be recycled 3 520kg of ferric hydroxide water purifying agent, and the direct economic benefit of 15 ten thousand yuan can be obtained each year after conversion.
The invention has the advantages that the economic benefit is not high, but the social benefit is relatively good, the waste acid is subjected to innocent treatment, the environmental pollution is reduced, waste is changed into valuables, and the waste recycling is realized, so that the invention is a waste acid treatment technology worthy of popularization.
Claims (7)
1. A method for treating sulfonated waste sulfuric acid in detergent production is characterized by comprising the following steps:
a. waste acid dilution: introducing clear water into a static mixing reactor, and adding seven to five percent of waste acid according to the flow of the water; one end of the static reaction mixer is provided with a water inlet and an acid inlet, the middle part of the static reaction mixer is provided with an alkali inlet, and the other end of the static reaction mixer is provided with a material outlet; the material outlet is communicated to a liquid inlet of the separation settler through a pipeline, and a pH meter is arranged at the liquid inlet of the separation settler; the water inlet, the acid inlet and the alkali inlet are respectively communicated with a clean water storage tank, a waste acid storage tank and a liquid alkali storage tank through respective metering pumps; the metering pump and the pH valve are respectively connected to an automatic control system;
the static reaction mixer is a multistage static reaction mixer, the shell of the static reaction mixer is a circular cylinder, a plurality of baffle layers which are sequentially arranged are arranged in the cylinder at intervals, each baffle layer consists of three groups of baffle plates, each group of baffle plates consists of three plates which are mutually at an angle of 90 degrees, the sharp angle of each baffle plate is positioned on the axial lead of the cylinder, and the end which is opposite to the cylinder and is provided with a water inlet is arranged on the cylinder; the adjacent two groups of baffle plates are staggered at 60 degrees; the interval between every two baffle layers is 200-300 mm, and every two axially adjacent baffle layers are staggered at 30 degrees; the water inlet and the material outlet are respectively arranged at the central positions of shafts at two ends of the cylinder; the acid inlet is arranged on the outer side wall of one end of the water inlet of the cylinder body, the alkali inlet is arranged on the outer side wall of the middle position of the cylinder body, and the acid inlet and the alkali inlet are arranged on the outer wall of the same side of the cylinder body and are upward in direction;
b. acid-base neutralization: adding quantitative sodium hydroxide into the static mixing reactor, wherein the adding amount of the sodium hydroxide is quantitative according to the numerical value of a pH meter arranged at the rear of the process flow;
c. oxidizing and settling: oxidizing and settling: oxidizing and settling the acid-base reaction product;
d. and (3) utilizing a product: and recycling the settled clear liquid into production or discharging the settled clear liquid after sewage treatment, and sending the settled clear liquid to a sewage treatment station to be used as a water purifying agent.
2. The method for treating sulfonated spent sulfuric acid in the production of detergents as claimed in claim 1, wherein: the adding amount of the waste acid in the step a is six percent of the content of clear water.
3. The method for treating sulfonated spent sulfuric acid in the production of detergents as claimed in claim 1, wherein: and (c) controlling the numerical value of the pH meter in the step b to be 7.0-8.0.
4. The method for treating sulfonated spent sulfuric acid in the production of detergents as claimed in claim 1, wherein: in the step c, oxidation and sedimentation are carried out in a separation sedimentation device, a pH meter is arranged at a water inlet in the separation sedimentation device, and the sedimentation time is 20-24 hours.
5. The method for treating sulfonated spent sulfuric acid in the production of detergents as claimed in claim 1, wherein: the separation settler is a rectangular water tank with the length, width and height of 12-20 meters, 1.2-1.5 meters and 0.8-1.2 meters and an upper opening, 3-5 compartments are arranged at equal intervals in the separation settler, a liquid inlet and a liquid outlet are respectively arranged at the edges of two ends of the separation settler, a pH meter is arranged at the liquid inlet, the liquid outlet is communicated with a water pipeline through a water pump, the bottoms of the compartments of the separation settler are mutually communicated, and a clean outlet is arranged at the bottom of each compartment between the liquid outlets; the upper part of the separation settler is provided with a safety net for covering.
6. The method for treating sulfonated spent sulfuric acid in the production of detergents as claimed in claim 5, wherein: the separation sedimentation device is characterized in that disc-shaped air charging pipes are arranged in each compartment of the separation sedimentation device, a plurality of exhaust holes are formed in the air charging pipes, the air charging pipes are communicated to an air compressor outside the separation sedimentation device, and the air compressor is connected to an automatic control system.
7. A method for treating sulfonated spent sulfuric acid in the production of detergents as claimed in any one of claims 1 or 6, characterized in that: the automatic control system is a PLC automatic control system.
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