Co-production device for preparing activated carbon from waste resin and recycling waste sulfuric acid

Abstract

The utility model relates to the technical field of waste resin regeneration, and particularly provides a co-production device for preparing activated carbon from waste resin and recycling waste sulfuric acid, which comprises a resin activation system and a sulfuric acid regeneration system. The method has the beneficial effects that a novel method for preparing the activated carbon from the waste resin is provided; a sulfuric acid regeneration system is matched, so that heat energy and sulfur-containing gas generated during preparation of the waste resin are effectively utilized; low-quality acid generated in the sulfuric acid regeneration process is fully utilized through a matched salt manufacturing system. And no acid gas is discharged in the whole process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of waste resin regeneration, and particularly relates to a waste resin preparation active carbon and waste sulfuric acid recycling cogeneration device. BACKGROUND

[0002] Resin catalyst is a kind of chemical substance that can change the speed of chemical reaction without changing the position of chemical reaction thermodynamic equilibrium, and itself is not obviously consumed in chemical reaction. Industrial resin catalyst is widely used in pharmaceutical factories, oil refineries, chemical plants, food processing and other industries. A considerable amount of waste industrial resin catalyst is inevitably replaced every year. With the development of economy and population growth, the amount of waste resin catalyst will also increase with the increase of fresh resin catalyst sales. Because resin catalyst will adsorb some harmful substances from raw materials, reactants and equipment materials during use, the discharge of these harmful substances with waste resin catalyst will also pollute the surrounding environment. Therefore, the recycling of waste resin catalyst can turn waste into treasure, change harm into benefit, and make the harmful part of waste resin catalyst less harmful or even harmless to achieve the purpose of clean production, which not only enhances the competitiveness of enterprises, but also solves the related environmental pollution problems.

[0003] In recent years, with the development of China's petroleum and chemical industry and fine chemical industry, the production and use of resin catalysts have increased. Because resin catalysts have a certain service life, their catalytic efficiency will be greatly reduced when they reach a certain service time, and new resin catalysts need to be replaced. Therefore, harmless treatment and recycling of waste resin catalysts are very necessary.

[0004] At present, with the increasing requirements of the state for environmental protection, waste resin catalysts as solid waste will have a certain impact on the environment if not properly treated, which is a key problem restricting the use and production of resin catalysts and the survival and development of enterprises.

[0005] Taking this as an opportunity, the recycling and comprehensive utilization project of waste resin catalysts can recycle the resin catalysts used by users, carry out harmless treatment, and comprehensively utilize them to turn waste into treasure.

[0006] Active carbon is an adsorbent material with excellent adsorption properties. Compared with ordinary active carbon, it has the excellent characteristics of large surface activity and strong adsorption function,

[0007] The main component of active carbon is carbon, containing a small amount of oxygen, nitrogen, hydrogen, sulfur and other elements, and it has strong adsorption and purification capacity. It can effectively adsorb various organic and inorganic pollutants in gas and water phase environment, and is widely used in medicine, chemical industry, food, environmental protection and other fields, for decolorization and deodorization, wastewater purification and adsorption of formaldehyde, VOCs, smoke and other toxic and harmful substances

[0008] Although activated carbon has strong adsorption capacity, it can solve the problem of waste water and waste gas treatment in industrial production process. However, the chemical and structural changes in activated carbon after repeated adsorption reactions will lead to the decrease of activated carbon activity and specific surface area, and the adsorption capacity cannot meet the production needs, becoming waste activated carbon.

[0009] According to the National Hazardous Waste List, waste activated carbon contaminated with hazardous waste belongs to hazardous waste. That is, activated carbon adsorbs VOCs, formaldehyde, benzene-containing waste gas, heavy metals and other toxic and harmful substances specified in the hazardous waste list, which belongs to hazardous waste. How to dispose of it has become a new problem for enterprises.

[0010] Waste sulfuric acid is mainly produced in:

[0011] Non-ferrous metal industry, non-ferrous metals such as copper, lead and zinc smelting gas acid purification process generally uses dilute acid washing adiabatic evaporation process, which produces about 10% of waste sulfuric acid.

[0012] Steel and metal pickling industry, steel wire rope, metal products, etc. In the production process, generally 18% of dilute sulfuric acid is used to clean the surface, producing waste sulfuric acid containing ferrous sulfate and ferric sulfate (content 6%).

[0013] Petrochemical industry, waste sulfuric acid in petrochemical industry is mainly produced in petroleum refining and alkylated oil production. Concentrated sulfuric acid is used to remove impurities (sulfides and unsaturated hydrocarbons) in gasoline and lubricating oil.

[0014] Dyes and intermediates, disperse dyes, reactive dyes, amphoteric dyes, neutral dyes and cationic dyes are produced in the production process of waste sulfuric acid.

[0015] Organic chemical industry, organic chemical products such as citric acid, aminosulfonic acid, oxalic acid, dimethyl sulfonic acid, synthetic cresol, dodecyl benzene sulfonic acid and other products and sulfonation, nitration, alkylation, esterification and other chemical reaction units. These reactions are widely used in the production of pesticides, medicines, dyes and spices industries, which use a lot of sulfuric acid.

[0016] In the generated waste sulfuric acid, inorganic waste sulfuric acid accounts for about 35%, organic waste sulfuric acid accounts for about 65%, and waste sulfuric acid with content of more than 40% accounts for about 46% of the total waste sulfuric acid. It has the following characteristics:

[0017] Widely distributed, scattered in many industries. Many chemical products are produced with waste sulfuric acid, and are very scattered.

[0018] The concentration of waste sulfuric acid is different, the content of harmful impurities is generally high, and some contain heavy metals which are difficult to handle.

[0019] High content of organic matter, fine chemical industry waste sulfuric acid mostly contains organic matter, direct use will cause secondary pollution.

[0020] Waste sulfuric acid treatment mainly has waste sulfuric acid concentration, high temperature cracking, chemical oxidation, extraction, crystallization, production of chemical fertilizer and neutralization treatment process. Different treatment processes are adopted by each enterprise according to the amount of waste sulfuric acid, waste sulfuric acid concentration, impurity composition and content, the use of sulfuric acid after treatment, etc., sometimes several processes are used together. Among these methods, only the neutralization treatment method cannot regenerate sulfuric acid. The treatment of waste sulfuric acid is mainly to remove the impurities in waste sulfuric acid, and to concentrate sulfuric acid.

[0021] If waste resin can be used to produce activated carbon substitutes, and waste sulfuric acid can be regenerated at the same time, great economic benefits can be created, and environmental pollution can be reduced.

[0022] Therefore, the application provides a waste resin preparation activated carbon and waste sulfuric acid recycling cogeneration device to solve the problems in the prior art. Utility model content

[0023] The technical problem to be solved by the utility model is to provide a waste resin preparation activated carbon and waste sulfuric acid recycling cogeneration device, which solves the problems in the prior art.

[0024] The utility model discloses a waste resin preparation activated carbon and waste sulfuric acid recycling cogeneration device, including resin activation system, sulfuric acid regeneration system,

[0025] The activation system includes a drying furnace, a carbonization furnace and an activation furnace. After mixing, the waste resin and waste activated carbon enter the drying furnace, are dried, enter the carbonization furnace for reaction, and then enter the activation furnace for activation. The carbonized resin product can be obtained. After the air enters the drying furnace, it is heated and removes the moisture in the raw materials. The exhaust port of the drying furnace introduces the spray cooling tower. The gas discharged from the drying furnace is washed by the spray cooling tower. Part of the gas is introduced into the carbonization furnace and the activation furnace by the fan again. After reaction, the combustible gas is output to the sulfuric acid regeneration system. Another part of the gas is introduced into the secondary combustion chamber and mixed with natural gas as fuel for combustion. Steam is generated in the waste heat boiler to provide heat for the drying furnace. The hot air recycled by the fan in the carbonization furnace is mixed with natural gas and air to incompletely carbonize the raw materials.

[0026] The sulfuric acid regeneration unit adopts a conventional waste sulfuric acid incineration regeneration device. The combustible gas generated by the resin activation system is used as fuel.

[0027] Further, the waste resin preparation active carbon and waste sulfuric acid recycling cogeneration device further comprises a salt making system, the salt making system comprises a pulp tank, a multi-stage absorption tower and a refining device; the magnesium oxide slurry arranged in the pulp tank reacts with the low concentration sulfuric acid generated in the sulfuric acid regeneration system in the multi-stage absorption tower to generate crude magnesium sulfate; and the crude magnesium sulfate is prepared into a magnesium sulfate product through the refining device.

[0028] Preferably, the sulfuric acid regeneration system comprises a combustion furnace, a waste heat boiler, a purification unit, a drying unit, a conversion unit and an absorption unit connected in sequence.

[0029] Further, the activation system further comprises a cooling device, and the carbonized resin generated by the activation furnace can be screened and packaged after cooling in the cooling device.

[0030] Further, the combustion products in the secondary combustion chamber are introduced into a quench tower after cooling in a waste heat boiler, and then introduced into a catalytic ceramic filter and reused to the drying furnace.

[0031] The beneficial effects of the utility model lie in:

[0032] 1. A new method for preparing active carbon from waste resin is provided.

[0033] 2. The heat energy and sulfur-containing gas generated in the preparation of waste resin are effectively utilized through the matched sulfuric acid regeneration system.

[0034] 3. The low-quality acid generated in the sulfuric acid regeneration process is fully utilized through the matched salt making system.

[0035] 4. There is no acidic gas emission in the whole process. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 Structure diagram of the waste resin preparation active carbon and waste sulfuric acid recycling cogeneration device; DETAILED DESCRIPTION

[0037] The specific embodiments of the utility model will be further described below in combination with the embodiments and drawings, and the following embodiments are only used to more clearly illustrate the technical embodiments of the utility model, and cannot limit the protection scope of the utility model.

[0038] Example 1

[0039] The utility model discloses a waste resin preparation active carbon and waste sulfuric acid recycling cogeneration device, including resin activation system, sulfuric acid regeneration system;

[0040] The activation system comprises a drying furnace, a carbonization furnace and an activation furnace; waste resin and waste activated carbon are mixed and then enter the drying furnace, are dried, enter the carbonization furnace to react, and then enter the activation furnace to be activated, so that carbonized resin products are obtained; air enters the drying furnace, is heated and carries away water in raw materials, is introduced into a spray cooling tower through an exhaust port of the drying furnace, and a part of the gas discharged from the drying furnace is introduced into the carbonization furnace and the activation furnace again through the spray cooling tower, combustible gas is generated after reaction and is output to the sulfuric acid regeneration system, another part is introduced into a secondary combustion chamber to be mixed with natural gas as fuel and is burned, and steam is generated in a waste heat boiler to provide heat for the drying furnace; hot air recycled by the fan in the carbonization furnace is mixed with natural gas and air to incompletely carbonize raw materials.

[0041] The sulfuric acid regeneration unit adopts a conventional waste sulfuric acid incineration regeneration device; and the combustible gas generated by the resin activation system is used as fuel.

[0042] Further, the waste resin preparation activated carbon and waste sulfuric acid recycling cogeneration device further comprises a salt preparation system, the salt preparation system comprises a pulp preparation tank, a multi-stage absorption tower and a refining device; magnesium oxide slurry arranged in the pulp preparation tank reacts with low-concentration sulfuric acid generated in the sulfuric acid regeneration system in the multi-stage absorption tower to generate crude magnesium sulfate; and the crude magnesium sulfate is prepared into magnesium sulfate products through the refining device.

[0043] Preferably, the sulfuric acid regeneration system comprises, which are connected in sequence, an incinerator, a waste heat boiler, a purification unit, a drying unit, a conversion unit and an absorption unit.

[0044] Further, the activation system further comprises a cooling device, and the carbonized resin generated by the activation furnace is cooled in the cooling device and then is screened and packaged.

[0045] Further, the combustion products in the secondary combustion chamber are introduced into a quenching tower after being cooled in the waste heat boiler, are then introduced into a catalytic ceramic filter, and are then recycled to the drying furnace.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A co-production device for preparing activated carbon from waste resin and recycling waste sulfuric acid, characterized in that, The system comprises a resin activation system and a sulfuric acid regeneration system. The activation system comprises a drying furnace, a carbonization furnace and an activation furnace. Waste resin and waste activated carbon are mixed and then enter the drying furnace, and after drying, they enter the carbonization furnace for reaction, and then enter the activation furnace for activation, so as to obtain carbonized resin products. Air enters the drying furnace to heat and remove moisture in the raw materials, and then enters the spray cooling tower through the exhaust port of the drying furnace. The gas discharged from the drying furnace is washed by the spray cooling tower, and a part of the gas is introduced into the carbonization furnace and the activation furnace by the fan, and then combustible gas is generated and output to the sulfuric acid regeneration system. Another part of the gas is introduced into the secondary combustion chamber and mixed with natural gas as fuel, and steam is generated in the waste heat boiler to provide heat for the drying furnace. The hot air recycled by the fan in the carbonization furnace is mixed with natural gas and air to incompletely carbonize the raw materials. The sulfuric acid regeneration unit adopts an existing waste sulfuric acid incineration regeneration device, and the combustible gas generated by the resin activation system is used as fuel.

2. The device according to claim 1, wherein the device is characterized by: The device also comprises a salt making system, which comprises a pulp making tank, a multi-stage absorption tower and a refining device. The magnesium oxide slurry in the pulp making tank reacts with low concentration sulfuric acid generated by the sulfuric acid regeneration system in the multi-stage absorption tower to generate crude magnesium sulfate. The crude magnesium sulfate is then refined to produce magnesium sulfate products.

3. The device according to claim 1, wherein the device is characterized by: The sulfuric acid regeneration system comprises a combustion furnace, a waste heat boiler, a purification unit, a drying unit, a conversion unit and an absorption unit connected in sequence.

4. The device according to claim 1, wherein the device is characterized by: The combustion products in the secondary combustion chamber are introduced into the quenching tower after being cooled by the waste heat boiler, and then introduced into the catalytic ceramic filter, and then recycled to the drying furnace.

5. The device according to any one of claims 1 to 4, wherein the device is characterized by further comprising: a waste resin activated carbon production unit; and a waste sulfuric acid recycling unit. The device also comprises a cooling device, and the carbonized resin generated by the activation furnace is cooled in the cooling device and then screened and packaged.

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