CN209537356U - A kind of caustic soda saponification method propylene oxide production system - Google Patents
A kind of caustic soda saponification method propylene oxide production system Download PDFInfo
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- CN209537356U CN209537356U CN201822187762.3U CN201822187762U CN209537356U CN 209537356 U CN209537356 U CN 209537356U CN 201822187762 U CN201822187762 U CN 201822187762U CN 209537356 U CN209537356 U CN 209537356U
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Abstract
The utility model discloses a kind of caustic soda saponification method propylene oxide production systems, chlorine is generated including electrolysis NaCl solution, the ion film device of hydrogen and NaOH solution, electrolysis NaCl solution is set to generate chlorine and propylene, the chlorohydrination equipment of water alcoholization reaction generation chloropropyl alcohol, NaOH and chloropropyl alcohol saponification is set to generate the saponification column of propylene oxide, the salt water reuse apparatus that is carried out by the salt water biochemical equipment of biochemical treatment and is recycled to the waste water after biochemical treatment for the waste water that saponification generates, the salt water reuse apparatus includes except impurity equipment and will be except the separation equipment of impurity treated solution is separated into NaCl solution and water and concentrator or crystallizer, wherein the concentrator or crystallizer are connect with the ion film device.The shortcomings that the utility model overcomes existing propylene oxide by chlorohydrination production method pollution environment while taking to fall water resource, provides one kind and does not generate waste residue and waste liquid, may make the caustic soda saponification method propylene oxide production system of resource circulation utilization.
Description
Technical field
The utility model relates to production of propylene oxide fields.Specially a kind of caustic soda saponification method propylene oxide production system.
Background technique
Propylene oxide is important basic chemical raw materials, and propylene oxide is mainly used for polyether polyol, surfactant, carbon
The production of acid propylene rouge and propylene glycol.Chlorohydrination is the most important production method for making propylene oxide, and traditional chlorohydrination is
Saponifying process is carried out as saponification agent using milk of lime, lime composition of milk is mainly CaO.The advantages of this method is that construction is thrown
It provides less, is at low cost.Ca (OH) can be generated after completing saponification2, due to Ca (OH)2Be slightly soluble in water, thus can generate a large amount of waste residue and
Waste liquid, direct emission not only can cause environmental pollution, while also resulting in a large amount of water in waste liquid and being wasted.
Utility model content
The technical issues of the utility model solves is that the chlorohydrination of use is overcome to prepare propylene oxide pollution environment and wave
The shortcomings that taking resource provide a kind of caustic soda saponification method propylene oxide production process for not generating waste residue and waste liquid substantially.
The caustic soda saponification method propylene oxide production process of the utility model, comprising the following steps:
(1) ion membrane process, electrolysis NaCl solution generates chlorine, hydrogen and NaOH solution by the process；
(2) chloropropyl alcohol process makes chlorine, propylene and water reaction generate chloropropyl alcohol by the process, and wherein chlorine is step
(1) chlorine generated in；
(3) saponifying process reacts chloropropyl alcohol with the NaOH solution generated in step (1) and generates epoxy third
Alkane and NaCl；
(4) biochemical treatment is carried out to the solution generated in step (3), the biochemistry in solution after then removing biochemical treatment
Metabolin；
(5) solution after biochemical metabolite will be removed in step (4) and be separated into NaCl solution and water, and to NaCl solution into
Row concentration；
(6) the concentration NaCl solution formed in step (5) is supplied to the ion membrane process in step (1), or made dense
Contracting NaCl solution enters the ion membrane process that steam Crystallization Procedure is further concentrated or is crystallized and is supplied in step (1).
Preferably, the water after separating in step (5) with NaCl solution is supplied to step (2).
Preferably, chloropropyl alcohol solution and NaOH solution are mixed with clear water by setting ratio, after mixing in step (3)
Solution from the top of saponification column spray into saponification column, saponification tower bottom be passed through steam, steam improves the temperature and pressure in tower,
Make mixed solution propylene oxide and be distilled out of propylene oxide steam at the top of saponification column, propylene oxide steam is carried out cold
It is solidifying to obtain crude propene oxide, propylene oxide finished product is obtained to crude propene oxide further progress rectifying.
Preferably, carrying out biochemical treatment using biological film process to the solution generated in step (3), the biomembrane is adopted
It is inoculated with SEM microbial inoculum.
Preferably, removed in step (4) biochemical metabolism product with high salt include: with surfactant to biochemical treatment after
Solution, which carries out processing, makes activating agent react with biochemical metabolite, then with polymerization cetyl trimethylammonium bromide to surface
Activating agent reacts the reactant generated with biochemical metabolite and is wrapped up, and into solution, addition inorganic coagulant makes to be wrapped up anti-
It answers object to precipitate, and sediment is separated with solution.
Preferably, solution is separated into NaCl solution and water by homogeneous membrane in step (5), lead in step (5)
Electroosmose process is crossed NaCl solution is concentrated.
Preferably, concentration NaCl solution TDS >=180000mg/L, TOC≤7mg/L that step (5) obtains.
Preferably, chloride ion content is less than 50mg/L in the water that step (5) obtains.
The utility model also provides a kind of caustic soda saponification method propylene oxide production system, including electrolysis NaCl solution generates chlorine
The ion film device of gas, hydrogen and NaOH solution makes electrolysis NaCl solution generate chlorine and propylene, water alcoholization reaction generation chlorine third
The chlorohydrination equipment of alcohol makes NaOH and chloropropyl alcohol saponification generate the saponification column of propylene oxide, give up to saponification generation
The salt water reuse apparatus that water carries out the salt water biochemical equipment of biochemical treatment and recycled to the waste water after biochemical treatment, the salt
Water reuse apparatus include the biochemical metabolism product in the solution after removing biochemical treatment except impurity equipment, will be except after impurity treatment
Solution be separated into the separation equipment of NaCl solution and water and concentrator that NaCl solution is concentrated or crystallize NaCl
Crystallizer, wherein the concentrator or crystallizer connect with the ion film device to the ion film device supply
NaCl solution or NaCl crystallization is concentrated.
Preferably, the salt water reuse apparatus also connect with chlorohydrination equipment with to the chlorohydrination equipment supply and institute
Water after stating NaCl solution separation.
Compared to the prior art the caustic soda saponification method propylene oxide production system of the utility model, has below beneficial to effect
Fruit:
1, the waste water that the caustic soda saponification method propylene oxide production system of the utility model can generate saponification is handled,
Waste water is separated into NaCl solution and water that treated re-supplies after NaCl solution is concentrated or crystallization and gives ion membrane process, base
Originally the zero-emission for realizing waste residue, not only avoids and pollutes the environment, and also achieves the recycling of NaCl, reduces life
Produce cost.
2, the caustic soda saponification method propylene oxide production process and production system of the utility model can also recycle water
It utilizes, so as to save great lot of water resources.
3, the caustic soda saponification method propylene oxide production process and production system of the utility model carry out at biochemistry to solution
It is removed in the solution after biochemical treatment after reason using surfactant, polymerization cetyl trimethylammonium bromide and inorganic precipitant
Biochemical metabolite, further purify water.
Detailed description of the invention
Fig. 1 is the schematic diagram of the caustic soda saponification method propylene oxide production system of the utility model one embodiment.
Specific embodiment
The caustic soda saponification method propylene oxide production process of one embodiment the following steps are included:
(1) ion membrane process, electrolysis NaCl solution generates chlorine, hydrogen and NaOH solution by the process, in this technique
It is middle to use direct current electrolysis NaCl solution, wherein the byproduct that the hydrogen generated can be used as the utility model is subject to Collection utilization,
(remaining after completion saponifying process) NaOH extra simultaneously can also be subject to other utilization.
(2) chloropropyl alcohol process makes chlorine, propylene and water reaction generate chloropropyl alcohol by the process, and wherein chlorine is step
(1) chlorine generated in, in the present embodiment, water are the clear water generated by reverse osmosis process.
(3) saponifying process reacts chloropropyl alcohol with the NaOH solution generated in step (1) and generates epoxy third
Alkane and NaCl；In this step, chloropropyl alcohol solution and NaOH solution are mixed with clear water by setting ratio, and mixed solution is from soap
The top for changing tower sprays into saponification column, and saponification tower bottom is passed through steam, and the pressure of steam can be 0.3-0.54MP, in the present embodiment
In, steam is the vapor of 0.4MP, and steam improves the temperature and pressure in tower, make mixed solution propylene oxide and
It is distilled out of propylene oxide steam at the top of saponification column, propylene oxide steam is condensed to obtain crude propene oxide, to thick epoxy
Propane further progress rectifying obtains propylene oxide finished product.
(4) biochemical treatment is carried out to the solution generated in step (3), it is in the present embodiment, molten to what is generated in step (3)
Liquid carries out biochemical treatment and uses biomembrane, and the biomembrane is inoculated with using SEM microbial inoculum, and SEM microbial inoculum includes salt tolerant bacterium, thermophilic
Tens kinds including salt bacterium, halophilic archaea, salt-toler ant yeast, thermophilic salt saccharomycete, salt tolerant microfauna and thermophilic salt microfauna
Or even the functional microorganism strain of several hundred kinds of different metabolic types, there is organic matter degradation microorganism chain abundant, when solution is logical
It can remove the organic matter in solution when crossing biomembrane.
The biochemical metabolism product in solution after carrying out biochemical treatment, after removing biochemical treatment.Specifically: it is living with surface
Property agent to the solution after biochemical treatment carry out processing so that activating agent is reacted with biochemical metabolite, then with polymerize cetyl
Trimethylammonium bromide Surfactant reacts the reactant generated with biochemical metabolite and is wrapped up, and adds into solution inorganic
Coagulant precipitates the reactant wrapped up, and sediment is separated with solution, purifies water quality further.
(5) solution after biochemical metabolite will be removed in step (4) and be separated into NaCl solution and water, and to NaCl solution into
Row concentration.In the present embodiment, solution is separated by NaCl solution and water by homogeneous membrane, by electroosmose process to NaCl solution
It is concentrated.In the present embodiment, concentration NaCl solution TDS (the total dissolved solid) >=180000mg/L obtained, TOC (have
Machine object)≤7mg/L.
(6) the concentration NaCl solution formed in step (5) is supplied to the ion membrane process in step (1), or made dense
Contracting NaCl solution enters the ion membrane process that steam Crystallization Procedure is further concentrated or is crystallized and is supplied in step (1).
The waste water that the caustic soda saponification method propylene oxide production process of the utility model can generate saponification is handled, and is located
Waste water after reason is separated into NaCl solution and water, re-supplies after NaCl solution is concentrated or crystallization and gives ion membrane process, substantially
The zero-emission for realizing waste residue, not only avoids and pollutes the environment, and also achieves the recycling of NaCl, reduces production
Cost.
In the present embodiment, chloride ion content is less than 50mg/L in the water that step (5) obtains.By what is formed in step (5)
Water is supplied to step (2) and/or step (1), and recycling for water may be implemented simultaneously in this way, saved water resource.
By the caustic soda saponification method propylene oxide production process of the utility model, to produce 80000 tons/year of propylene oxide dresses per year
It sets, for mating 13.5 ten thousand tons/year of ionic exchange membrane caustics, production and running cost that the production time in year can save based on 8000h
With as follows:
1, the production run expense of material recycle saving
(1) it recycles clear water: process water 350t can be recycled per hour, recycle 2,800,000 t/ of clear water total amount, production process is used
Water (single stage desalting water) price presses 3.0 yuan/t, can save 8,400,000 yuan of water rate every year；
(2) recycle salt: per hour recycle Nacl 20t, 160,000 t/ of Nian Huishou Nacl total amount, sea salt price according to
230 yuan/t, 36,800,000 yuan of sea salt buying expenses can be saved every year；
(3) slag is dehydrated: can save about 10,000,000 yuan of the lime filters pressing workshop operating cost of traditional chlorohydrination every year；
(4) slag is disposed: being produced 2t saponification slag by the every 1 ton of propylene oxide of production of traditional caustic soda saponification method and is calculated, every annual meeting generates
160000 tons of saponification slags, disposition expense per ton can save saponification slag disposition expense not less than 8,000,000 yuan based on not less than 50 yuan every year；
(5) propylene feedstocks: saponification to reduce propylene consumption, by 15kg/t.PO, in the present invention, PO refers to
Propylene oxide can save propylene 1200t every year, and propylene price can save 8,400,000 yuan of raw material cost based on 7000 yuan/t；
Above total saving 71,600,000 yuan/year of producing cost.
2, the expenses of taxation of emission reduction saving
(1) Sewage Water Emissions tax
It is counted according to existing level-one emission standard A COD≤50mg/l, is converted to TOC about 15mg/l or so, annual TOC row
It is high-volume 60000kg, TOC pollutional equivalent is 60000/0.49=122449, and the every pollutional equivalent amount of tax to be paid of water pollutant is by " environment is protected
Protect tax tax items assessment table " 7 yuan of calculating of standard placed in the middle, 85.7 ten thousand yuan of Sewage Water Emissions tax need to be paid every year.
(2) solid waste discharge fee
According to production 1t PO output 2t saponification slag meter, produces solid waste total amount per year and calculated by 160,000 t, solid waste
Environment protection tax by metallurgical slag in " environment protection tax tax items assessment table ", flyash, clinker, other solid waste (containing semisolid,
Liquid waste) standard 25 yuan/t of collection, need to pay solid waste discharge tax every year is 4,000,000 yuan.
In another embodiment, caustic soda saponification method propylene oxide production process includes step (1)-(5), and in the embodiment
In, as a preferred option, the water separated with NaCl solution is admitted to chloropropyl alcohol process and/or ion membrane process.
The utility model also provides a kind of caustic soda saponification method propylene oxide production system, including electrolysis NaCl solution generates chlorine
The ion film device of gas, hydrogen and NaOH solution makes electrolysis NaCl solution generate chlorine and propylene, water alcoholization reaction generation chlorine third
The chlorohydrination equipment of alcohol makes NaOH and chloropropyl alcohol saponification generate the saponification column of propylene oxide, give up to saponification generation
The salt water reuse apparatus that water carries out the salt water biochemical equipment of biochemical treatment and recycled to the waste water after biochemical treatment, the salt
Water reuse apparatus include the biochemical metabolism product in the solution after removing biochemical treatment except impurity equipment, will be except after impurity treatment
Solution be separated into the separation equipment of NaCl solution and water and concentrator that NaCl solution is concentrated or crystallize NaCl
Crystallizer, wherein the concentrator or crystallizer connect with the ion film device to the ion film device supply
NaCl solution or NaCl crystallization is concentrated.
Wherein, in the present embodiment, salt water biochemical equipment is carried out biochemical using biomembrane, and biomembrane is with the progress of SEM microbial inoculum
Solution is separated into NaCl solution and water by homogeneous membrane by inoculation, separation equipment, and concentrator is using electrodialytic technique to NaCl
Solution is concentrated.
A kind of caustic soda saponification method propylene oxide production system provided by the utility model can be such that NaCl is recycled,
The production cost of propylene oxide is greatly saved while avoiding pollution.
In the present embodiment, the salt water reuse apparatus is also connect with to institute with chlorohydrination equipment and/or ion film device
It states chlorohydrination equipment and/or ion film device supplies the water after separating with NaCl solution, to realize the recycling of water.
Above embodiments are only the exemplary embodiment of the utility model, are not used in limitation the utility model, this is practical new
The protection scope of type is defined by the claims.Those skilled in the art are right in the essence and protection scope of the utility model
The various modifications or equivalent replacements that the utility model is made also fall within the protection scope of the present utility model.
Claims (2)
1. a kind of caustic soda saponification method propylene oxide production system, which is characterized in that generate chlorine, hydrogen including electrolysis NaCl solution
With the ion film device of NaOH solution, make the chlorine that electrolysis NaCl solution generates chlorine and propylene, water alcoholization reaction generate chloropropyl alcohol
Mellowing equipment makes NaOH and chloropropyl alcohol saponification generate the saponification column of propylene oxide, carry out to the waste water that saponification generates
The salt water biochemical equipment of biochemical treatment and the salt water reuse apparatus that the waste water after biochemical treatment is recycled, the salt water reuse
Equipment include the biochemical metabolite in the solution after removing biochemical treatment except impurity equipment, will be except impurity treated solution point
The concentrator being concentrated from the separation equipment for NaCl solution and water and to NaCl solution or the crystallization for crystallizing NaCl are set
It is standby, wherein the concentrator or crystallizer, which are connect to the ion film device with the ion film device, supplies concentration NaCl
Solution or NaCl crystallization.
2. caustic soda saponification method propylene oxide production system according to claim 1, which is characterized in that the salt water reuse is set
It is standby also to be connected with chlorohydrination equipment to supply the water after separating with the NaCl solution to the chlorohydrination equipment.
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| CN201822187762.3U CN209537356U (en) | 2018-12-25 | 2018-12-25 | A kind of caustic soda saponification method propylene oxide production system |
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| CN201822187762.3U CN209537356U (en) | 2018-12-25 | 2018-12-25 | A kind of caustic soda saponification method propylene oxide production system |
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