CN108529560A - The method that hydrogen chloride is produced from fluorination tail gas - Google Patents
The method that hydrogen chloride is produced from fluorination tail gas Download PDFInfo
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- CN108529560A CN108529560A CN201810389215.5A CN201810389215A CN108529560A CN 108529560 A CN108529560 A CN 108529560A CN 201810389215 A CN201810389215 A CN 201810389215A CN 108529560 A CN108529560 A CN 108529560A
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- fluorination
- tail gas
- hydrogen
- hydrogen chloride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
- C01B7/0718—Purification ; Separation of hydrogen chloride by adsorption
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
- C01B7/0718—Purification ; Separation of hydrogen chloride by adsorption
- C01B7/0725—Purification ; Separation of hydrogen chloride by adsorption by active carbon
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of method for producing hydrogen chloride in tail gas from fluorination, the fluorination tail gas contains hydrogen chloride, hydrogen fluoride, water and organic fluoride, and hydrogen fluoride content is less than 10%, and total organic content is less than 1%, it is characterized in that：After the fluorination tail gas is passed sequentially through activated carbon adsorber, bubbling spray tower, condensation separation, adsorbing tower with molecular sieve processing, chlorination hydrogen production is obtained；Hydrogen fluoride weight content is less than 20ppm in chlorination hydrogen production, and content of organics is less than 5ppm, and water weight content is less than 50ppm.The present invention uses liquid phase scrubbing method, high to hydrogen fluoride absorption efficiency.Absorbing liquid after absorption recycles press filtration, removes calcirm-fluoride, and calcium chloride is replenished in time, and absorption efficiency is stablized.Using absorbing liquid is made after the higher calcium chloride dissolving of purity, it is press-filtered out after the calcirm-fluoride come simply refines and can be used as merchandise sales.
Description
Technical field
The present invention relates to a kind of methods that hydrogen chloride is produced in tail gas from fluorination.
Background technology
Since 50~60 years last century, the research and development of organic fluorocompound are grown rapidly, and are almost goed deep into current fluorochemical
To the every aspect of our daily lifes.From refrigerant to high molecular material, liquid crystal material, from pesticide to medicine, organic fluoride
Be widely used to the every field such as pesticide, medicine, material, atomic energy, aerospace.According to relevant information, by the U.S.
In the noval chemical compound that chemistry can log in, fluorochemical accounts for 6.5% or more.The synthesis of organic fluorocompound is required for mostly by fluorine
Change process introduces fluorine, and by other halides such as chlorinatedorganic, reacts fluorination with hydrogen fluoride, is most common fluorination
Process.It will produce the largely hydrogen chloride gas containing hydrogen fluoride in this fluorination process.Due to the presence of hydrogen fluoride, make this chlorine
Change hydrogen application value significantly to decline.Existing processing method be by contain hydrogen fluoride hydrogen chloride gas water absorption be made it is fluorine-containing
Hydrochloric acid affects economic benefit, increases offal treatment amount as spent acid processing.Therefore it needs to seek chlorine in fluorination production
Changing hydrogen tail gas clean-up technique has especially important meaning, and in this respect, domestic and international researcher has made numerous studies and experiment.
U.S. Patent number US4714604 discloses a kind of method detaching HF from the mixture of HF and HCl, with silica-treated chlorine
Change hydrogen/fluorination hydrogen mixed gas or the hydrochloric acid containing hydrogen fluoride, hydrogen fluoride is made to generate SiF with silicon dioxde reaction4, absorbed with water
To containing SiF4Hydrochloric acid, SiF is then removed by distillation4.Using this method can remove effectively HF in mixed gas or
SiF4, shortcoming are that technique is cumbersome, and the silicon fluoride of generation needs in addition processing, while silicon fluoride is more toxic.United States Patent (USP)
Number US4317805 proposes that a kind of method removing hydrogen fluoride from hydrogen fluoride and chlorine hydride mixed gas body, the invention will contain 5%
For the HCl mixed gas of left and right HF by the reaction bed equipped with particle anhydrous calcium chloride, gas is cooled to -20~20 through cooler
DEG C, preferably 0~5 DEG C, then by second particle anhydrous calcium chloride reaction bed, in mixed gas HF contents be down to 20ppm with
Under, the condensation temperature of gas is key factor when being passed through second reaction bed in this method, directly affects the fluorine removal of mixed gas
Efficiency.Shortcoming is that gas need to be through multistage cooling and absorption, and equipment investment is big, high energy consumption, and it is low to may be only available for HF contents
HCl gas defluorinates.Chinese patent literature CN104888574A discloses a kind of work of separating fluorine hydride in difluoromethane reaction end gas
Skill, will contain hydrogen fluoride tail gas with 98% concentrated sulfuric acid extract absorb hydrogen fluoride after, after residual air water absorbing hydrogen chloride using washing,
Alkali cleaning, rectifying obtain dichloromethane, and hydrochloric acid is made in water absorbing hydrogen chloride.It is said that this method can be such that fluorinion concentration in hydrochloric acid drops
To 50ppm or less.But the sulfuric acid after the absorption hydrogen fluoride is only used for anhydrous hydrogen fluoride production, otherwise can only be used as at spent acid
Reason, therefore cannot be widely used.
Invention content
The purpose of the present invention is to provide produce hydrogen chloride in a kind of simple and feasible, favorable working performance tail gas from fluorination
Method.
Technical solution of the invention is：
A method of hydrogen chloride being produced from fluorination tail gas, the fluorination tail gas contains hydrogen chloride, hydrogen fluoride, water and has
Machine fluoride, hydrogen fluoride content are less than 10%, and total organic content is less than 1%, it is characterized in that：The fluorination tail gas is led to successively
After crossing activated carbon adsorber, bubbling spray tower, condensation separation, adsorbing tower with molecular sieve processing, chlorination hydrogen production is obtained；Hydrogen chloride produces
Hydrogen fluoride weight content is less than 20ppm in product, and content of organics is less than 5ppm, and water weight content is less than 50ppm.
Activated carbon is wooden, shell or coaly activated carbon, total hole volume ＞ 0.7cm3/ g, surface area ＞ 750 ㎡/g.
The bubbling spray tower, gas feed set gas distributor, and liquid-inlet sets spray thrower, tower body liquid level when absorption
More than gas distributor gas distributor, after gas entrance after absorbing liquid absorbs, escaping gas is sprayed with top spray thrower
The absorbing liquid contact gone out, further absorbs wherein hydrogen fluoride.
Adsorption liquid is calcium chloride solution, more optimized for saturation calcium chloride solution.
The molecular sieve is mordenite molecular sieve, preferably sodium form mordenite with high silicon aluminum ratio, further preferably silicon
Aluminium ratio 35-40 sodium form mercerising fluorites.
The activated carbon adsorber, adsorption temp are -20~20 DEG C, and adsorptive pressure is 0~1.0MPa, and operation air speed is
100~500h-1。
It is -20~30 DEG C that the bubbling spray tower, which absorbs temperature, and adsorptive pressure is 0~1.0MPa, operation air speed is 50~
200h-1。
The adsorbing tower with molecular sieve, adsorption temp are -20~20 DEG C, and adsorptive pressure is 0~1.0MPa, and operation air speed is
100~500h-1。
The activated carbon adsorber, bubbling spray tower, adsorbing tower with molecular sieve may respectively be one or more.
Gas after bubbling spray tower absorbs condenses and is situated between into adsorbing tower with molecular sieve after one or more levels condensation separation
- 30~0 DEG C of matter temperature.
The present invention has the following advantages：
The present invention uses liquid phase scrubbing method, high to hydrogen fluoride absorption efficiency.Absorbing liquid after absorption recycles press filtration, removes fluorine
Change calcium, calcium chloride is replenished in time, absorption efficiency is stablized.Using absorbing liquid is made after the higher calcium chloride dissolving of purity, it is press-filtered out and
Calcirm-fluoride it is simply refined after can be used as merchandise sales.Activated carbon, molecular sieve can multiple desorption and regeneration, three wastes yield is few.Through
Crossing treated, hydrogen chloride can be directly used in production as raw material.This method wide adaptation range is suitble to industrialization, to being fluorinated tail
Organic component content is less high in gas to use.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural schematic diagram of one embodiment of the invention preparation facilities.
Specific implementation mode
It is fluorinated condensed not solidifying tail gas from 1 lower part of charcoal trap to enter, gas out enters bubbling spray tower
2, by after bubble absorption below liquid level, gas effusion contacts further absorption with the calcium chloride solution sprayed from top again
Hydrogen fluoride；Gas after absorption is after demister removes Vapor Entrainment mist, then 3 condensation separation moisture (salt of condensed device
Acid), gas out adsorbs water removal using molecular sieve absorption tower 4, is dried, pure hydrogen chloride gas；Absorb fluorination
What the liquid after hydrogen came out from bubbling spray tower lower part, it is pumped into 6 press filtration of filter (filter press) by pump 5, filtrate is for example dense
Degree declines less, then is recycled into bubbling spray tower, and concentration enters calcium chloride dissolving tank 7 after reducing, and calcium chloride is added and is configured to
Calcium chloride saturated solution is pumped into bubble absorbing tower using pump 8；Calcirm-fluoride from filter (filter press) out can pass through
Merchandise sales are used as after refined.
Example 1~3
It is that KC40A φ 1.5mm activated carbons are put into the Fluorine-lined packed columns of DN25 × 1000 by specification, another same specification lining four
Fluorine packed column is packed into SAR40 modenites, is that DN4.0 × 800mm graphite bubbling spray towers are connect with condenser by specification.Configuration
It is saturated calcium chloride solution.By activated carbon packed column, bubbling spray tower, molecular sieve packed column and calcium chloride circulator, condensation
Device, cooler connect as shown in the picture.P-chlorotrichlormethyl fluorination (preparing p-chloro benzo trifluoride-99) tail gas is connected to activity
Charcoal adsorption tower gas feed, after activated carbon adsorption, the absorption of saturation calcium chloride solution, condensation separation, molecular sieve absorption, from activity
Charcoal adsorption column outlet, bubbling spray tower secondary condenser gas vent, the separately sampled detection group of adsorbing tower with molecular sieve gas vent
Divide content, controls 500~600ml/min of inlet gas flow, -10~0 DEG C of bubbling spray tower circulation fluid temperature, bubble absorbing tower
- 20~-10 DEG C of condenser brine temp, each node analysis data are shown in Table 1 after stable.
Example 4~6
Such as example 1, will be changed to (prepare to chlorine trifluoromethoxy the fluorination of chlorine trichlorine metoxybenzene into the tail gas that system is handled
Benzene) tail gas be connected to activated carbon adsorber gas feed, through activated carbon adsorption, saturation calcium chloride solution absorptions, condensation separation, divide
After son sieve absorption, go out from activated carbon adsorber outlet, bubbling spray tower secondary condenser gas vent, adsorbing tower with molecular sieve gas
The separately sampled detected components content of mouth, operational circumstances such as example 1, analysis data are shown in Table 1.
Table 1
It can be seen that the excellent effect of the present invention.
Claims (10)
1. produce the method for hydrogen chloride in a kind of tail gas from fluorination, the fluorination tail gas contains hydrogen chloride, hydrogen fluoride, water and organic
Fluoride, hydrogen fluoride content are less than 10%, and total organic content is less than 1%, it is characterized in that：The fluorination tail gas is passed sequentially through into work
Property charcoal adsorption tower, bubbling spray tower, condensation separation, after adsorbing tower with molecular sieve processing, obtain chlorination hydrogen production；In chlorination hydrogen production
Hydrogen fluoride weight content is less than 20ppm, and content of organics is less than 5ppm, and water weight content is less than 50ppm.
2. the method that hydrogen chloride is produced in the tail gas according to claim 1 from fluorination, it is characterized in that：Activated carbon be it is wooden,
Shell or coaly activated carbon, total hole volume ＞ 0.7 cm3/g, surface area ＞ 750 ㎡/g.
3. the method that hydrogen chloride is produced in the tail gas according to claim 1 from fluorination, it is characterized in that：The bubbling spray
Tower, gas feed set gas distributor, and liquid-inlet sets spray thrower, and tower body liquid level is distributed in gas distributor gas when absorption
More than device, after gas entrance after absorbing liquid absorbs, escaping gas is contacted with the absorbing liquid that top spray thrower sprays, further
Absorb wherein hydrogen fluoride.
4. the method that hydrogen chloride is produced in the tail gas according to claim 4 from fluorination, it is characterized in that：Adsorption liquid is calcium chloride
Solution.
5. the method that hydrogen chloride is produced in the tail gas according to claim 1 from fluorination, it is characterized in that：The molecular sieve is silk
Geolyte molecular sieve.
6. the method that hydrogen chloride is produced in the tail gas according to claim 1 from fluorination, it is characterized in that：The activated carbon adsorption
Tower, adsorption temp are -20 ~ 20 DEG C, and adsorptive pressure is 0 ~ 1.0MPa, and operation air speed is 100 ~ 500h-1。
7. the method that hydrogen chloride is produced in the tail gas according to claim 1 from fluorination, it is characterized in that：The bubbling spray tower
It is -20 ~ 30 DEG C to absorb temperature, and adsorptive pressure is 0 ~ 1.0MPa, and operation air speed is 50 ~ 200h-1。
8. the method that hydrogen chloride is produced in the tail gas according to claim 1 from fluorination, it is characterized in that：The molecular sieve absorption
Tower, adsorption temp are -20 ~ 20 DEG C, and adsorptive pressure is 0 ~ 1.0MPa, and operation air speed is 100 ~ 500h-1。
9. the method that hydrogen chloride is produced in the tail gas according to claim 1 from fluorination, it is characterized in that：The activated carbon adsorption
Tower, bubbling spray tower, adsorbing tower with molecular sieve may respectively be one or more.
10. the method that hydrogen chloride is produced in the tail gas according to claim 1 from fluorination, it is characterized in that：Bubbling spray tower is inhaled
Gas after receipts enters adsorbing tower with molecular sieve, -30 ~ 0 DEG C of cooling medium temperature after one or more levels condensation separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810389215.5A CN108529560A (en) | 2018-04-27 | 2018-04-27 | The method that hydrogen chloride is produced from fluorination tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810389215.5A CN108529560A (en) | 2018-04-27 | 2018-04-27 | The method that hydrogen chloride is produced from fluorination tail gas |
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| Publication Number | Publication Date |
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| CN108529560A true CN108529560A (en) | 2018-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810389215.5A Pending CN108529560A (en) | 2018-04-27 | 2018-04-27 | The method that hydrogen chloride is produced from fluorination tail gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109850848A (en) * | 2019-04-04 | 2019-06-07 | 南京工业大学 | The method of hydrogen fluoride is removed in hydrogen chloride gas |
| CN110563016A (en) * | 2019-10-09 | 2019-12-13 | 江西理工大学 | Method for treating waste gas containing fluorine and chlorine by using white tungsten slag |
| CN111137862A (en) * | 2019-12-25 | 2020-05-12 | 中船重工（邯郸）派瑞特种气体有限公司 | Hydrogen chloride raw material gas moisture removal device and moisture removal method |
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|---|---|---|---|---|
| US3976447A (en) * | 1973-04-26 | 1976-08-24 | Pennwalt Corporation | Removal of hydrogen fluoride from gaseous mixture by absorption on alkaline earth metal fluoride |
| CN103588173A (en) * | 2013-11-05 | 2014-02-19 | 太仓中化环保化工有限公司 | Method for purifying byproduct hydrogen chloride in fluorinated alkane production |
| CN106495100A (en) * | 2016-11-09 | 2017-03-15 | 中南大学 | A kind of removing fluohydric acid gas from hydrogen chloride gas the method for reclaiming fluohydric acid gas |
-
2018
- 2018-04-27 CN CN201810389215.5A patent/CN108529560A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3976447A (en) * | 1973-04-26 | 1976-08-24 | Pennwalt Corporation | Removal of hydrogen fluoride from gaseous mixture by absorption on alkaline earth metal fluoride |
| CN103588173A (en) * | 2013-11-05 | 2014-02-19 | 太仓中化环保化工有限公司 | Method for purifying byproduct hydrogen chloride in fluorinated alkane production |
| CN106495100A (en) * | 2016-11-09 | 2017-03-15 | 中南大学 | A kind of removing fluohydric acid gas from hydrogen chloride gas the method for reclaiming fluohydric acid gas |
Non-Patent Citations (1)
| Title |
|---|
| 肖大福 等: "氟化氢气体吸收装置的设计及研制", 《山东化工》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109850848A (en) * | 2019-04-04 | 2019-06-07 | 南京工业大学 | The method of hydrogen fluoride is removed in hydrogen chloride gas |
| CN110563016A (en) * | 2019-10-09 | 2019-12-13 | 江西理工大学 | Method for treating waste gas containing fluorine and chlorine by using white tungsten slag |
| CN111137862A (en) * | 2019-12-25 | 2020-05-12 | 中船重工（邯郸）派瑞特种气体有限公司 | Hydrogen chloride raw material gas moisture removal device and moisture removal method |
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Application publication date: 20180914 |
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