CN101607910B - Removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration - Google Patents
Removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration Download PDFInfo
- Publication number
- CN101607910B CN101607910B CN200910182288A CN200910182288A CN101607910B CN 101607910 B CN101607910 B CN 101607910B CN 200910182288 A CN200910182288 A CN 200910182288A CN 200910182288 A CN200910182288 A CN 200910182288A CN 101607910 B CN101607910 B CN 101607910B
- Authority
- CN
- China
- Prior art keywords
- nitration
- chlorobenzene
- solution
- thermal insulation
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration, comprising the following steps of: (1) thermal insulation nitration; (2) vacuum flashing; (3) gas-liquid separation: nitrochlorobenzene crude products is further treated in liquid phase and gas-phase materials enters a next step; (4) cooling and condensation: condensed materials enter a next step; (5) gas-liquid separation: the nitrochlorobenzene and water are further treated and utilized in liquid phase, and gas-phase materials enter a next step; (6) mixed absorption: nitric acid aqueous solution and hydrogen peroxide aqueous solution absorb nitrogen oxides from exhaust gas; and (7) gas-liquid separation: the gas-phase materials are discharged after the nitrogen oxides therein achieve the standard in content, the batching of mixed acid and recycling of absorption liquid are conducted in liquid phase. The technology has the advantages of high utilization of materials, less three wastes and easy industrial implementation.
Description
Technical field
The present invention relates to a kind of removing process of nitrogen oxides of exhaust gas, the removing process of the oxynitride that produces in particularly a kind of chlorobenzene thermal insulation nitration process belongs to fine chemical technology and technical field of waste gas treatment.
Background technology
Oxynitride (NO
x) be meant a series of compounds of forming by nitrogen element and oxygen element, comprise N
2O, NO, N
2O
3, NO
2, N
2O
4, N
2O
5, use molecular formula NO usually
xRepresent.Except that nitrogen protoxide and nitrogen peroxide, other oxynitride are all extremely unstable, meet light, wet or thermal change becomes nitrogen peroxide and nitrogen protoxide, and nitrogen protoxide becomes nitrogen peroxide again.
Oxynitride is very big to the harm of human body, can directly cause the respiratory tract injury of human body.Oxynitride can make plant damaged even death, under the katalysis of light, is prone to hydrocarbons complicated photochmeical reaction take place, and produces photo-chemical smog, causes serious topsoil.Oxynitride also can cause the destruction of ozonosphere, also is prone to be combined into the acid rain that contains the nitric acid composition with steam.Therefore, country has formulated strict NO
xEmission standard (GB13223-2003), 60m chimney in a organized way in the exhaust gas discharged oxynitride be equivalent to mass concentration in nitrogen peroxide≤2.05mg/m
3Air standard.
In the chlorobenzene thermal insulation nitration process; Sulfuric acid is catalyzer; Chlorobenzene and nitric acid generation nitration reaction generate the nitration product nitro-chlorobenzene, are 60 ℃-140 ℃ in service temperature, and working pressure is 0.4MPa-1.0MPa; Chlorobenzene and the reaction of nitric acid generation continuous nitrification, chlorobenzene reacts the mixture that makes nitro-chlorobenzene through continuous thermal insulating nitration.The mixture of nitro-chlorobenzene, cools off reacting rear material rapidly through the vacuum flashing technology through the reacted material of continuous thermal insulating nitration, and makes the water byproduct and the unreacted raw material chlorobenzene that generate in the nitration reaction process get into gas phase; In vacuum flashing, spent acid is concentrated, the material of nitration reaction is through liquid-liquid separation, and water is mainly sulphuric acid soln, separates through removal of impurities, supplies nitration reaction to recycle; Oil phase is the nitro-chlorobenzene mixture; The nitro-chlorobenzene mixture obtains p-Nitrophenyl chloride, o-Nitrochlorobenzene and m-nitrochlorobenzene product further separation the after washing, alkali cleaning, washing, and the gaseous phase materials product is mainly through cooled non-condensable gases and contains NO in the flash vaporization process
xWaste gas.
Prepare in the nitro-chlorobenzene process at chlorobenzene thermal insulation nitration, the main source of nitrous oxides exhaust gas has: (1) is in the chlorobenzene thermal insulation nitration process, in order to improve the security of process; Reduce the decomposition of nitric acid, adopt chlorobenzene excessive, nitric acid is as the control material of reaction process; The nitration mixture concentration of using in the also common nitrifying process of nitration mixture concentration is low; But because the thermal insulation nitration temperature is high, nitric acid is prone to that at high temperature decomposition reaction takes place and produces NO
x, therefore, have still in the chlorobenzene thermal insulation nitration process that remnants have unreacted nitric acid in decomposition reaction and the reacting rear material of nitric acid; (2) in the nitration reaction process oxidation side reaction can take place, cause the generation of oxynitride; (3) in the chlorobenzene thermal insulation nitration process, produce nitrosyl-sulfuric acid (NOHSO
4), in the material vacuum flashing process after nitration reaction is accomplished, nitrosyl-sulfuric acid generation decomposition reaction also can produce oxynitride; (4) nitric acid also takes place to decompose to emit nitrogen oxide in transporting procedures.Adopt in the vacuum flashing process at reacting rear material, oxynitride gets into the gaseous phase materials system, will produce the waste gas of oxynitride like this, and staple is H
2O, NO
x, air and a small amount of organism, wherein NO
xVolume(tric)fraction be between the 0.04%-0.1%.
Contain NO in the generation of chlorobenzene thermal insulation nitration process
xWaste gas, lacked volatilizable organism in addition, therefore, the emission control technology in the research and development chlorobenzene thermal insulation nitration process seems particularly important.
Obviously, traditional NO
xThe waste gas pollution control and treatment technology all is to containing NO
xGas absorb, and work as NO
xWhen containing organism in the waste gas, can cause the pollution problem of liquid product because of having organic pollutants, be converted into the liquid phase pollution thereby gaseous phase materials is polluted, the liquid phase after the absorption is handled and is just faced new problem.
Summary of the invention
Administer NO in order fundamentally to reach
xThe purpose of waste gas, and can recycle organism and the NO that produces in the gaseous phase materials system
x, realize cleaner production, the present invention is directed in the chlorobenzene thermal insulation nitration process NO
xThe characteristics that contain organism chlorobenzene, nitrated chlorobenzene in the waste gas are with NO
xAbsorption and NO
xThe comprehensive utilization that absorbs the absorption liquid of back generation is merged mutually, combines the characteristics of chlorobenzene thermal insulation nitration technology simultaneously, adopts Static Gas-liquid mixer to handle NO as absorption unit
xWaste gas.The aqueous nitric acid of process using massfraction 10%-25% of the present invention absorbs, and the acquisition and the waste gas pollution control and treatment combination of system vacuum system are carried out simultaneously.Simultaneously, with the aqueous solution (25% nitric acid, the H of 0.1%-0.5% of rare nitric acid and ydrogen peroxide 50
2O
2) handle the NO of the nitrated generation of chlorobenzene as absorption agent
x, the organism in the waste gas is also absorbed in the lump, and absorption liquid is used as nitration mixture preparation water and nitric acid material.
The removing process method of the oxynitride that the purpose of this invention is to provide that a kind of sepn process is simple, separation costs is low, produces in the consuming little energy, safe a kind of chlorobenzene thermal insulation nitration process.
The technical scheme that realizes above-mentioned purpose is:
(1) adiabatic nitration: in the thermal insulation nitration device, chlorobenzene is mixed the generation nitration reaction with nitration mixture, the nitration mixture in the reaction process is to be mixed by nitric acid, sulfuric acid and water, and chlorobenzene mixes the generation nitration reaction with nitration mixture, and reacted material gets into next step;
(2) vacuum flashing: in vacuum flashing equipment, the material behind the last step chlorobenzene thermal insulation nitration is carried out vacuum flashing, the material after the vacuum flashing gets into next step;
(3) solution-air is separated: in the solution-air separating device, the material that a last step is obtained carries out the solution-air separation, and liquid phase nitro-chlorobenzene bullion and aqueous sulfuric acid remove further separation and purification, and gaseous phase materials gets into next step;
(4) cooling condensation: in the cooling condensing equipment, the gaseous phase materials that a last step is obtained carries out indirect heat exchange cooling condensation, and condensed material gets into next step;
(5) solution-air is separated: in the solution-air separating device, the material that a last step is obtained carries out the solution-air separation, and liquid phase is that chlorobenzene and water go further to handle and recycle, and gaseous phase materials gets into next step;
(6) blended absorbent: in the blended absorbent device, gas, aqueous nitric acid and ydrogen peroxide 50 are mixed the NO in the absorbing waste gas
x, the material after the blended absorbent gets into next step;
(7) solution-air is separated: in the solution-air separating device, the material that a last step is obtained carries out solution-air separation, NO in the gaseous phase materials
xAdopt method discharging in a organized way after content is up to standard, liquid phase material is as NO in nitration mixture batching use in the first step chlorobenzene thermal insulation nitration process and the 6th step blended absorbent process
xAbsorption liquid recycle.
Further: the device that uses in the blended absorbent of the 6th step is in hydraulic ejector or squirt pump or the static mixer any one.
Further: the massfraction of nitric acid is 15%-25% in the absorption liquid that uses in the 6th step blended absorbent, and the massfraction of ydrogen peroxide 50 is 0.1%-0.5%, and absorption temperature is 10 ℃-40 ℃.
The NO that produces in a kind of chlorobenzene thermal insulation nitration process of the present invention
xThe principle of work of removing process method be: adopt to contain H
2O
2The aqueous nitric acid absorbing waste gas, i.e. water absorption of N O in the salpeter solution
2Gas adds H simultaneously
2O
2Make NO change NO into
2, reaction formula is:
3NO
2+H
2O＝2HNO
3+NO
NO+H
2O
2＝NO
2+H
2O
(1) makes full use of NO and NO
2Solubleness in nitric acid adopts rare nitric acid to containing NO than big this principle in water
xWaste gas absorbs; (2) contain NO from what the vacuum flashing device came out
xThe gaseous phase materials of waste gas contains NO through indirect heat exchange, solution-air after separating
xThe entering static mixer of waste gas with contain H
2O
2The nitric acid absorption liquid in static mixer, absorb operation, absorbed NO
xAfter absorption liquid supply nitrification to recycle as the batching of the nitrated raw material of chlorobenzene, the waste gas after further separating through solution-air carries out emptying in a organized way; (3) adopt static mixer as NO
xThe absorption unit of waste gas and the deriving means of vacuum system; Static Gas-liquid mixer is as solution-air blended absorbent device; The acquisition of vacuum system and waste gas pollution control and treatment are organically combined, when carrying out the solution-air blended absorbent, obtain to satisfy the vacuum flashing requirement of material after the chlorobenzene nitration reaction.
Realize that the main technique equipment that the present invention needs is: static mixer, absorption unit, solution-air separating device and vacuum flashing equipment etc.
Adopt the advantage of technique scheme to be: (1) is with containing H
2O
2Rare HNO
3The aqueous solution is as NO
xAbsorption liquid, can fully reclaim NO
xOrganic volatile with in the system has made full use of NO
xBe dissolved in rare HNO
3, and H
2O
2More stable in acidic medium, can oxidation NO be NO
2, simultaneously, remaining H
2O
2At high temperature decompose the characteristics of pollution-free generation; (2) with the solution-air static mixer as NO
xAbsorption unit; This absorption unit has not only that the solution-air mixed characteristic is good, absorption technique is simple, absorb characteristics completely, and obtains device as the vacuum of flash system simultaneously, and absorption equipment and pumping equipment are shared; Both save facility investment, and reduced process cost; (3) with the certain density HNO of containing that obtains after the solution-air absorption
3With the additional HNO of organic absorption liquid as absorption liquid circulation fluid and nitrifying process
3And H
2The raw material of O has the utilization of materials height, and the outstanding advantage that discharge amount of exhaust gas is few helps industrializing implementation.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
Embodiment one
Main technique equipment is: static mixer, absorption unit, solution-air separating device and flashing tower etc.
As shown in Figure 1, the method for the removing process of the oxynitride that produces in a kind of chlorobenzene thermal insulation nitration process, said process step is following:
(1) adiabatic nitration: in SV type adiabatic nitration static mixing reactor; The nitration mixture of nitration reaction is that 98% sulfuric acid, 65% nitric acid and spent acid mix by a certain percentage by the massfraction of technical grade; The dehydration value of nitration mixture is 2.0, and the mol ratio of chlorobenzene and nitric acid is 1.1: 1.0, chlorobenzene is mixed with nitration mixture nitration reaction takes place; Temperature of charge after the nitration reaction is about 160 ℃, and reacted material gets into next step;
(2) vacuum flashing: in flash tank, absolute working pressure is 0.08MPa, and the material behind the last step chlorobenzene thermal insulation nitration is carried out vacuum flashing, and cooling is below 80 ℃ fast to make reacted material, and the material after the vacuum flashing gets into next step;
(3) solution-air is separated: in the Sofitel air water separator, the material that a last step is obtained carries out the solution-air separation, and liquid phase nitro-chlorobenzene bullion and aqueous sulfuric acid remove further separation and purification, and gaseous phase materials gets into next step;
(4) cooling condensation: in plate-type condenser, with the condensation of lowering the temperature of the last material gaseous phase materials that obtains of step, the temperature out of phlegma is about 60 ℃, and condensed material gets into next step;
(5) solution-air is separated: in the Sofitel air water separator; The material that a last step is obtained carries out the solution-air separation; Gaseous phase materials goes further off gas treatment, after amount of nitrogen oxides in the gaseous phase materials is up to standard, adopts method discharging in a organized way, and liquid phase is that nitro-chlorobenzene and water get into next step;
(6) blended absorbent: in hydraulic ejector, the massfraction of nitric acid is 15% in the absorption liquid, and the massfraction of ydrogen peroxide 50 is 0.1%; Absorption temperature is 10 ℃; Gas, aqueous nitric acid and ydrogen peroxide 50 are mixed, the oxynitride in the absorbing waste gas, the material after the blended absorbent gets into next step;
(7) solution-air is separated: in liquid-gas separator; The material that a last step is obtained carries out the solution-air separation; The volume(tric)fraction of oxynitride≤0.024% in the gaseous phase materials; Adopt the 60m chimney to discharge in a organized way, liquid phase material recycles as the absorption liquid of oxynitride in nitration mixture batching use in the first step chlorobenzene thermal insulation nitration process and the 6th step blended absorbent process.
Embodiment two
Main technique equipment is: static mixer, absorption unit, solution-air separating device and vacuum flashing equipment etc.
As shown in Figure 1, the method for the removing process of the oxynitride that produces in a kind of chlorobenzene thermal insulation nitration process, said process step is following:
(1) adiabatic nitration: in SV type adiabatic nitration static mixing reactor; The nitration mixture of nitration reaction is that 98% sulfuric acid, 65% nitric acid and spent acid mix by a certain percentage by the massfraction of technical grade; The dehydration value of nitration mixture is 3.0, and the mol ratio of chlorobenzene and nitric acid is 1.1: 1.0, chlorobenzene is mixed with nitration mixture nitration reaction takes place; Temperature of charge after the nitration reaction is about 140 ℃, and reacted material gets into next step;
(2) vacuum flashing: in flash cooler, be 0.04MPa at absolute working pressure, the material behind the last step chlorobenzene thermal insulation nitration is carried out vacuum flashing, make reacted material cool off about 70 ℃ fast, the material after the vacuum flashing gets into next step;
(3) solution-air is separated: in liquid-gas separator, the material that a last step is obtained carries out the solution-air separation, and liquid phase nitro-chlorobenzene bullion and aqueous sulfuric acid remove further separation and purification, and gaseous phase materials gets into next step;
(4) cooling condensation: in shell-and tube condenser, with the condensation of lowering the temperature of the last material gaseous phase materials that obtains of step, the temperature out of phlegma is about 40 ℃, and the condensed material of cooling condensing equipment gets into next step;
(5) solution-air is separated: in liquid-gas separator; The material that a last step is obtained carries out the solution-air separation; Gaseous phase materials goes further off gas treatment, after amount of nitrogen oxides in the gaseous phase materials is up to standard, adopts method discharging in a organized way, and liquid phase is that nitro-chlorobenzene and water get into next step;
(6) blended absorbent: in water jet pump, the massfraction of nitric acid is 20% in the absorption liquid, and the massfraction of ydrogen peroxide 50 is 0.3%; Absorption temperature is 20 ℃; Gas, aqueous nitric acid and ydrogen peroxide 50 are mixed, the oxynitride in the absorbing waste gas, the material after the blended absorbent gets into next step;
(7) solution-air is separated: in the air-water separator; The material that a last step is obtained carries out the solution-air separation; The volume(tric)fraction of oxynitride≤0.024% in the gaseous phase materials; Adopt the 60m chimney to discharge in a organized way, liquid phase material recycles as the absorption liquid of oxynitride in nitration mixture batching use in the first step chlorobenzene thermal insulation nitration process and the 6th step blended absorbent process.
Embodiment three
Main technique equipment is: static mixer, absorption unit, solution-air separating device and vacuum flashing equipment etc.
As shown in Figure 1, the method for the removing process of the oxynitride that produces in a kind of chlorobenzene thermal insulation nitration process, said process step is following:
(1) adiabatic nitration: in SV type adiabatic nitration static mixing reactor; The nitration mixture of nitration reaction is that 98% sulfuric acid, 65% nitric acid and water mix by a certain percentage by the massfraction of technical grade; The dehydration value of nitration mixture is 4.0, and the mol ratio of chlorobenzene and nitric acid is 1.05: 1.0, chlorobenzene is mixed with nitration mixture nitration reaction takes place; Temperature of charge after the nitration reaction is about 120 ℃, and reacted material gets into next step;
(2) vacuum flashing: the absolute working pressure in flash tank is 0.02MPa, and the material behind the last step chlorobenzene thermal insulation nitration is carried out vacuum flashing, makes reacted material cool off about 60 ℃ fast, and the material after the vacuum flashing gets into next step;
(3) solution-air is separated: in air water separator, the material that a last step is obtained carries out the solution-air separation, and liquid phase nitro-chlorobenzene bullion and aqueous sulfuric acid remove further separation and purification, and gaseous phase materials gets into next step;
(4) cooling condensation: in threaded pipe type condenser, with the condensation of lowering the temperature of the last material gaseous phase materials that obtains of step, the temperature out of phlegma is about 20 ℃, and condensed material gets into next step;
(5) solution-air is separated: in the air-water separator; The material that a last step is obtained carries out the solution-air separation; Gaseous phase materials goes further off gas treatment, after amount of nitrogen oxides in the gaseous phase materials is up to standard, adopts method discharging in a organized way, and liquid phase is that nitro-chlorobenzene and water get into next step;
(6) blended absorbent: in static mixer; The massfraction of nitric acid is 25% in the absorption liquid that uses; The massfraction of ydrogen peroxide 50 is 0.5%, and absorption temperature is 40 ℃, and gas, aqueous nitric acid and ydrogen peroxide 50 are mixed; Oxynitride in the absorbing waste gas, the material after the blended absorbent gets into next step;
(7) solution-air is separated: in the Sofitel air water separator; The material that a last step is obtained carries out the solution-air separation; The volume(tric)fraction of oxynitride≤0.024% in the gaseous phase materials; Adopt the 60m chimney to discharge in a organized way, liquid phase material recycles as the absorption liquid of oxynitride in nitration mixture batching use in the first step chlorobenzene thermal insulation nitration process and the 6th step blended absorbent process.
The innovation part of technology of the present invention is embodied in: made full use of NO
xBe dissolved in rare HNO
3And H
2O
2Stable and can oxidation NO be NO in acidic medium
2Characteristics, utilized remaining H simultaneously
2O
2At high temperature decompose, the characteristics of pollution-free generation, and the singularity of chlorobenzene thermal insulation nitration process and the mixed characteristic of solution-air static mixer organically combined, with the certain density HNO of containing that obtains after the solution-air absorption
3With the additional HNO of organic circulation fluid as nitrifying process
3And H
2The raw material of O has the utilization of materials height, the outstanding advantage that three wastes discharge amount is few.
Remove the various embodiments described above, embodiment of the present invention also have a lot, and the technical scheme that all employings are equal to or equivalence is replaced is all within protection scope of the present invention.
Claims (3)
1. the removal methods of the oxynitride that produces in the chlorobenzene thermal insulation nitration process is characterized in that said method steps is following:
(1) adiabatic nitration: in the thermal insulation nitration device, chlorobenzene is mixed the generation nitration reaction with nitration mixture, the nitration mixture in the reaction process is to be mixed by nitric acid, sulfuric acid and water, and chlorobenzene mixes the generation nitration reaction with nitration mixture, and reacted material gets into next step;
(2) vacuum flashing: in vacuum flashing equipment, the material behind the last step chlorobenzene thermal insulation nitration is carried out vacuum flashing, the material after the vacuum flashing gets into next step;
(3) solution-air is separated: in the solution-air separating device, the material that a last step is obtained carries out the solution-air separation, and liquid phase nitro-chlorobenzene bullion and aqueous sulfuric acid remove further separation and purification, and gaseous phase materials gets into next step;
(4) cooling condensation: in the cooling condensing equipment, the gaseous phase materials that a last step is obtained carries out indirect heat exchange cooling condensation, and condensed material gets into next step;
(5) solution-air is separated: in the solution-air separating device, the material that a last step is obtained carries out the solution-air separation, and liquid phase chlorobenzene and water go further to handle and recycle, and gaseous phase materials gets into next step;
(6) blended absorbent: in the blended absorbent device, gas, aqueous nitric acid and ydrogen peroxide 50 are mixed, the oxynitride in the absorbing waste gas, the material after the blended absorbent gets into next step;
(7) solution-air is separated: in the solution-air separating device; The material that a last step is obtained carries out the solution-air separation; Amount of nitrogen oxides adopts method discharging in a organized way after up to standard in the gaseous phase materials, liquid phase material use as nitration mixture batching in step (1) the chlorobenzene thermal insulation nitration process and step (6) blended absorbent process in the absorption liquid of oxynitride recycle.
2. the removal methods of the oxynitride that produces in a kind of chlorobenzene thermal insulation nitration process according to claim 1 is characterized in that: the device that uses in step (6) blended absorbent is in hydraulic ejector or squirt pump or the static mixer any one.
3. the removal methods of the oxynitride that produces in a kind of chlorobenzene thermal insulation nitration process according to claim 1; It is characterized in that: the massfraction of nitric acid is 15%-25% in the absorption liquid that uses in step (6) blended absorbent; The massfraction of ydrogen peroxide 50 is 0.1%-0.5%, and the temperature that absorbs operation is 10 ℃-40 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910182288A CN101607910B (en) | 2009-07-07 | 2009-07-07 | Removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910182288A CN101607910B (en) | 2009-07-07 | 2009-07-07 | Removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101607910A CN101607910A (en) | 2009-12-23 |
| CN101607910B true CN101607910B (en) | 2012-10-17 |
Family
ID=41481836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910182288A Expired - Fee Related CN101607910B (en) | 2009-07-07 | 2009-07-07 | Removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101607910B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407068A (en) * | 2010-09-25 | 2012-04-11 | 潍坊信誉环境工程有限公司 | Acidic water solution for absorbing NOx and method for purifying NOx-containing waste gas by applying same |
| CN103495337B (en) * | 2013-10-16 | 2016-08-10 | 重庆紫光国际化工有限责任公司 | Remove the device and method of residual ammonia in HCN synthesis gas |
| CN106032522B (en) * | 2015-03-16 | 2019-03-08 | 中国石油化工股份有限公司 | A kind of combined method of cultivating microalgae and industrial waste gas denitration |
| CN106031843B (en) * | 2015-03-16 | 2019-11-15 | 中国石油化工股份有限公司 | The wet denitration method of industrial waste gas |
| CN106032521B (en) * | 2015-03-16 | 2019-03-08 | 中国石油化工股份有限公司 | The method of cultivating microalgae and its with the united method of industrial waste gas denitration |
| CN114539063A (en) * | 2022-02-11 | 2022-05-27 | 安徽东至广信农化有限公司 | Method for producing nitrochlorobenzene by vacuum concentration method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4453027A (en) * | 1982-12-10 | 1984-06-05 | Monsanto Company | Adiabatic process for the nitration of halobenzenes |
| EP0675104A1 (en) * | 1994-03-30 | 1995-10-04 | Bayer Ag | Process for adiabatic preparation of mononitrohalogenbenzenes |
| CN1133283A (en) * | 1995-10-20 | 1996-10-16 | 清华大学 | Preparing nitro-chlorobenzene by catalytic nitration |
| CN1371902A (en) * | 2001-02-23 | 2002-10-02 | 拜尔公司 | Continuous thermo-insulation method for production of nitro-chlorobenzene |
-
2009
- 2009-07-07 CN CN200910182288A patent/CN101607910B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4453027A (en) * | 1982-12-10 | 1984-06-05 | Monsanto Company | Adiabatic process for the nitration of halobenzenes |
| EP0675104A1 (en) * | 1994-03-30 | 1995-10-04 | Bayer Ag | Process for adiabatic preparation of mononitrohalogenbenzenes |
| CN1133283A (en) * | 1995-10-20 | 1996-10-16 | 清华大学 | Preparing nitro-chlorobenzene by catalytic nitration |
| CN1371902A (en) * | 2001-02-23 | 2002-10-02 | 拜尔公司 | Continuous thermo-insulation method for production of nitro-chlorobenzene |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101607910A (en) | 2009-12-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101607910B (en) | Removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration | |
| CN100396360C (en) | A nitric oxides (NOX) waste pollution control in industrial process and resource reclaiming method | |
| CN103303877B (en) | Many sources of the gas low concentration SO 2smoke comprehensive reclaims acid-making process flow process | |
| CN106031841A (en) | Denitration technology and equipment for gas | |
| CN101607909B (en) | Rapid material cooling and waste acid recycling process after chlorobenzene thermal insulation nitration | |
| CN100424007C (en) | Method for absorbing and extracting phosphor and fluorin from phosphoric acid produced in kiln method | |
| CN111183726B (en) | Method for treating waste acid generated by nitration of dinitrotoluene | |
| CN102068881A (en) | Synchronous heat exchange gas absorption tower and nitric oxide absorption and concentration process | |
| CN101947405A (en) | Method for circularly absorbing NOX and SO3 in nitrified tail gas by using sulfuric acid | |
| CN103599685B (en) | Recycle the method for CO nitric oxide in tail gas for preparing oxalate | |
| CN103691287B (en) | A kind of recycling system of dinitrogen tetroxide tail gas | |
| CN109012110B (en) | Method for capturing carbon dioxide by using sodium hydroxide and sodium carbonate | |
| CN104785102A (en) | Energy-saving and efficient N2O and NOx removing process | |
| CN112978691B (en) | Method and device for preparing nitric acid from tail gas containing nitrogen oxides and nuclear fuel post-treatment plant system | |
| CN111747381B (en) | Equipment and process for producing high-concentration sulfuric acid or fuming sulfuric acid by dry-wet combination technology | |
| CN100513304C (en) | Production process of No gas for synthesizing oxalate | |
| CN109012089B (en) | Method for capturing carbon dioxide by using potassium hydroxide and potassium carbonate | |
| CN215462108U (en) | Ammonium bicarbonate solution rectification and concentration system | |
| CN1279998C (en) | Method for single stage circulation absorbing nitrogen oxide intail gas by dilute nitric acid | |
| CN103011102B (en) | Cooling process for desalted water conveyed to nitric acid absorbing tower | |
| CN209481225U (en) | Acid waste liquid recyclable device | |
| CN100540117C (en) | Nitric acid tail gas processing method | |
| IE35360B1 (en) | Manufacture of nitric acid | |
| CN109173602B (en) | Cyclic utilization method of nitrogen oxide waste gas generated in quinclorac synthesis | |
| CN214182533U (en) | Processing system of nitration tail gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121017 Termination date: 20150707 |
|
| EXPY | Termination of patent right or utility model |