CN104016304A - Method for preparing concentrated hydrochloric acid by using hydrogen chloride gas of tetrafluoroethylene by-product - Google Patents
Method for preparing concentrated hydrochloric acid by using hydrogen chloride gas of tetrafluoroethylene by-product Download PDFInfo
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- CN104016304A CN104016304A CN201410275750.XA CN201410275750A CN104016304A CN 104016304 A CN104016304 A CN 104016304A CN 201410275750 A CN201410275750 A CN 201410275750A CN 104016304 A CN104016304 A CN 104016304A
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- hydrochloric acid
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- hydrogen chloride
- tetrafluoroethylene
- chloride gas
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Abstract
The invention discloses a method for preparing concentrated hydrochloric acid by using hydrogen chloride gas of a tetrafluoroethylene by-product. The method comprises the following steps: (1) cooling pyrolysis gas in tetrafluoroethylene production to 160-190 DEG C by a quench cooler, entering the cooled pyrolysis gas to a condenser, cooling to 60-90 DEG C, condensing 60-80% of water vapor into water, and entering the condensed water into a vapor-water separator to separate water from the gas; (2) entering the pyrolysis gas which is not condensed in the condenser and the gas separated out from the vapor-water separator into a hydrogen chloride gas absorber of diluted hydrochloric acid of which the mass concentration is 0.5-3%, absorbing the hydrogen chloride gas by diluted hydrochloric acid to generate concentrated hydrochloric acid of which the concentration is not lower than 31wt%, and discharging concentrated hydrochloric acid out of the system after separating by a separator, wherein the hydrogen chloride gas absorber is respectively connected with an online hydrochloric acid analyzer and an automatic hydrochloric acid adjusting device. The method disclosed by the invention is simple and easy, stable to run, and good in absorption effect on the hydrogen chloride gas, the prepared hydrochloric acid product is high in concentration and good in quality, and environmental pollution caused by emission of the hydrogen chloride gas is avoided.
Description
Technical field
The present invention relates to a kind of processing method of utilizing chemical industry waste gas to prepare industrial chemicals of chemical technology field, especially a kind of processing method of utilizing zellon byproduct hydrogen chloride gas to prepare hydrochloric acid.
Background technology
Along with the continuous progress of social development and Chemical Engineering Technology, people more and more pay attention to the comprehensive development and utilization of chemical emission.The industrialized producing technology of TFE (tetrafluoroethylene) is mainly chloroform method.This method, since nineteen forty-one starts pilot scale, has been the industrial method generally adopting always.First it make difluorochloromethane by chloroform and anhydrous hydrogen fluoride reaction, and the latter is hot cracked again, and dehydrochlorination obtains tetrafluoroethylene.The dilute hydrochloric acid of condensation by-product 15% left and right of splitting gas in domestic existing tetrafluoroethylene production equipment, cannot direct marketing but 15% dilute hydrochloric acid utility value is not high, and improve the quality standard that concentration reaches concentrated hydrochloric acid that can direct marketing and need consume a large amount of hydrogen chloride gas, improved production cost.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of method of utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid, the method is to utilize the characteristic of splitting gas dew-point temperature, make its part water vapor condensation Cheng Shui according to the difference of vapour pressure, partial condensation becomes concentrated hydrochloric acid.Its processing method is simple and easy, stable, to hydrogen chloride gas good absorbing effect, obtained hydrochloric acid product concentration is high, quality good, thereby avoids hydrogen chloride gas discharge to cause environmental pollution, can make full use of resource, reduces the waste of resource.
For achieving the above object, the present invention adopts following technical scheme:
Utilize the hydrogen chloride gas of tetrafluoroethylene by-product to prepare a method for concentrated hydrochloric acid, comprise the following steps:
(1) splitting gas in tetrafluoroethylene production is cooled to 160-190 DEG C through quencher, splitting gas after cooling enters condenser, is cooled to 60-90 DEG C, the water vapor condensation Cheng Shui of 60%-80%, the water of condensation enters air water separator, by water and gas delivery;
(2) splitting gas not being condensed in condenser, and in air water separator, isolated gas enters into the hydrochloric gas absorber that mass concentration is 0.5-3% dilute hydrochloric acid is housed, hydrogen chloride gas is absorbed by dilute hydrochloric acid, generate the concentrated hydrochloric acid that concentration is not less than 31wt%, concentrated hydrochloric acid is transmitting system after separator separates;
In step (1), in splitting gas, the volume ratio of each composition is: tetrafluoroethylene monomer 15-25%, difluorochloromethane 14-24%, hydrogenchloride 10-15%, water vapor 36-61%;
In step (1), described air water separator material is carbon steel liner graphite or carbon steel liner PTFE, the inner fibre web mist eliminator that increases, and thickness is 300mm-600mm, reduces gas entrainment salt acid mist;
In step (2), described hydrochloric gas absorber is connected with online hydrochloric acid analyser and hydrochloric acid automatic-adjusting device, the concentration of the hydrochloric acid in online hydrochloric acid analyser on-line analysis hydrochloric gas absorber, the concentration of the hydrochloric acid in hydrochloric acid automatic-adjusting device and hydrochloric gas absorber is chain, controls the amount that joins the dilute hydrochloric acid in hydrochloric gas absorber.
In step (2), the splitting gas after absorbing hydrogen chloride enters into former tetrafluoroethylene production system, refines and produces TFE monomer.
Described hydrochloric gas absorber adopts graphite equipment or carbon steel inner liner polytetrafluoroethylene (PTFE) or carbon steel inner bushing ring Ethylene Oxide PO.
The present invention has following beneficial effect with respect to prior art:
(1) technique is simple, easily operates and controls, and process operation is stable;
(2) device structure is reasonable, invest little, instant effect;
(3) method that has adopted condensed in two stages, condensed moisture to absorb from, hydrogen chloride gas, absorbs completely the hydrogen chloride gas of tetrafluoroethylene by-product, and has reclaimed a large amount of water, has effectively protected environment, takes full advantage of again resource;
(4) the hydrochloric acid product concentration that makes is high, quality good, can ensure that the concentration of hydrochloric acid of preparation reaches the requirement of commodity concentrated hydrochloric acid.
Brief description of the drawings
Fig. 1 is process flow sheet of the present invention;
Fig. 2 is the structural representation of air water separator of the present invention.
Wherein, 1-quencher, 2-condenser, 3-hydrochloric gas absorber, the former tetrafluoroethylene production system of 4-, 5-air water separator, 6-separator, the online hydrochloric acid analyser of 7-and hydrochloric acid automatic-adjusting device, 8-liquid inlet to be separated, 9-pneumatic outlet, 10-demister element, 11-liquid exit.
Embodiment
The present invention is further illustrated in conjunction with the embodiments, should be noted that following explanation is only in order to explain the present invention, does not limit its content.
Embodiment 1
Technical process as shown in Figure 1, utilizes the hydrogen chloride gas of tetrafluoroethylene by-product to prepare the method for concentrated hydrochloric acid, comprises the following steps:
(1) by the volume ratio of the each composition in tetrafluoroethylene production be: tetrafluoroethylene monomer 15-25%, difluorochloromethane 14-24%, hydrogenchloride 10-15%, the splitting gas of water vapor 36-61%, is cooled to 180 DEG C through quencher, and the splitting gas after cooling enters condenser, be cooled to 70 DEG C, 70% water vapor condensation Cheng Shui, the water of condensation enters air water separator, by water and gas delivery;
(2) splitting gas not being condensed in condenser, and in air water separator, isolated gas enters into the hydrochloric gas absorber that mass concentration is 1.5% dilute hydrochloric acid is housed, hydrogen chloride gas is absorbed by dilute hydrochloric acid, the concentrated hydrochloric acid that generation concentration is 32wt%, concentrated hydrochloric acid is transmitting system after separator separates; Hydrochloric gas absorber is connected with online hydrochloric acid analyser and hydrochloric acid automatic-adjusting device, the concentration of the hydrochloric acid in online hydrochloric acid analyser on-line analysis hydrochloric gas absorber, the concentration of the hydrochloric acid in hydrochloric acid automatic-adjusting device and hydrochloric gas absorber is chain, control joins the amount of the dilute hydrochloric acid in hydrochloric gas absorber, has realized on-line automatic regulation and control.Splitting gas after absorbing hydrogen chloride enters into former tetrafluoroethylene production system, refines and produces TFE monomer.
Wherein, air water separator material adopts carbon steel liner graphite, the inner fibre web mist eliminator that increases, and thickness is 500mm.Be entrained in the tiny liquid mist in gas phase, while passing through the silk screen of mesh mist eliminator, droplet is encountered on demist silk screen, adhered to or absorbed, through repeated multiple times absorption droplet, minimum droplet agglomeration, be coalesced as large drop, drop is under the effect of gravity, move downward along braided wires twine and the point of crossing of silk, continue the droplet of carrying secretly in adsorbed gas simultaneously, the droplet of growing up flows to the bottom of mist eliminator silk screen, drop down with the gravity by drop self, in fact, in absorption process, because the inside of whole mesh mist eliminator has been full of the droplet absorbing, strengthen the adsorptive power of independent metal or engineering plastics silk, while making normally to work, the demist rate of demist silk screen increases substantially, minimum droplet effectively can be adsorbed and deviates from down.Reduce gas entrainment salt acid mist; Hydrochloric gas absorber adopts carbon steel liner PTFE.
Embodiment 2
Utilize the hydrogen chloride gas of tetrafluoroethylene by-product to prepare the method for concentrated hydrochloric acid, comprise the following steps:
(1) by the volume ratio of the each composition in tetrafluoroethylene production be: tetrafluoroethylene monomer 15-25%, difluorochloromethane 14-24%, hydrogenchloride 10-15%, the splitting gas of water vapor 36-61%, is cooled to 160 DEG C through quencher, and the splitting gas after cooling enters condenser, be cooled to 60 DEG C, 80% water vapor condensation Cheng Shui, the water of condensation enters air water separator, by water and gas delivery;
(2) splitting gas not being condensed in condenser, and in air water separator, isolated gas enters into the hydrochloric gas absorber that mass concentration is 0.5% dilute hydrochloric acid is housed, hydrogen chloride gas is absorbed by dilute hydrochloric acid, the concentrated hydrochloric acid that generation concentration is 34wt%, concentrated hydrochloric acid is transmitting system after separator separates; Hydrochloric gas absorber is connected with online hydrochloric acid analyser and hydrochloric acid automatic-adjusting device, the concentration of the hydrochloric acid in online hydrochloric acid analyser on-line analysis hydrochloric gas absorber, the concentration of the hydrochloric acid in hydrochloric acid automatic-adjusting device and hydrochloric gas absorber is chain, control joins the amount of the dilute hydrochloric acid in hydrochloric gas absorber, has realized on-line automatic regulation and control.Splitting gas after absorbing hydrogen chloride enters into former tetrafluoroethylene production system, refines and produces TFE monomer.
Wherein, air water separator material adopts carbon steel liner PTFE, the inner fibre web mist eliminator that increases, and thickness is 300mm, reduces gas entrainment salt acid mist; Hydrochloric gas absorber adopts carbon steel liner PO.
Embodiment 3
Utilize the hydrogen chloride gas of tetrafluoroethylene by-product to prepare the method for concentrated hydrochloric acid, comprise the following steps:
(1) by the volume ratio of the each composition in tetrafluoroethylene production be: tetrafluoroethylene monomer 15-25%, difluorochloromethane 14-24%, hydrogenchloride 10-15%, the splitting gas of water vapor 36-61%, is cooled to 190 DEG C through quencher, and the splitting gas after cooling enters condenser, be cooled to 90 DEG C, 60% water vapor condensation Cheng Shui, the water of condensation enters air water separator, by water and gas delivery;
(2) splitting gas not being condensed in condenser, and in air water separator, isolated gas enters into the hydrochloric gas absorber that mass concentration is 0.5% dilute hydrochloric acid is housed, hydrogen chloride gas is absorbed by dilute hydrochloric acid, the concentrated hydrochloric acid that generation concentration is 31wt%, concentrated hydrochloric acid is transmitting system after separator separates; Hydrochloric gas absorber is connected with online hydrochloric acid analyser and hydrochloric acid automatic-adjusting device respectively, the concentration of the hydrochloric acid in online hydrochloric acid analyser on-line analysis hydrochloric gas absorber, the concentration of the hydrochloric acid in hydrochloric acid automatic-adjusting device and hydrochloric gas absorber is chain, control joins the amount of the dilute hydrochloric acid in hydrochloric gas absorber, has realized on-line automatic regulation and control.Splitting gas after absorbing hydrogen chloride enters into former tetrafluoroethylene production system, refines and produces TFE monomer.
Wherein, air water separator material adopts carbon steel liner PTFE, the inner fibre web mist eliminator that increases, and thickness is 600mm, reduces gas entrainment salt acid mist; Hydrochloric gas absorber adopts carbon steel liner PO.
Claims (4)
1. utilize the hydrogen chloride gas of tetrafluoroethylene by-product to prepare a method for concentrated hydrochloric acid, it is characterized in that, comprise the following steps:
(1) splitting gas in tetrafluoroethylene production is cooled to 160-190 DEG C through quencher, splitting gas after cooling enters condenser, is cooled to 60-90 DEG C, the water vapor condensation Cheng Shui of 60%-80%, the water of condensation enters air water separator, by water and gas delivery;
(2) splitting gas not being condensed in condenser, and in air water separator, isolated gas enters into the hydrochloric gas absorber that mass concentration is 0.5-3% dilute hydrochloric acid is housed, hydrogen chloride gas is absorbed by dilute hydrochloric acid, generate the concentrated hydrochloric acid that concentration is not less than 31wt%, concentrated hydrochloric acid is transmitting system after separator separates;
In step (1), in splitting gas, the volume ratio of each composition is: tetrafluoroethylene monomer 15-25%, difluorochloromethane 14-24%, hydrogenchloride 10-15%, water vapor 36-61%;
In step (2), described hydrochloric gas absorber is connected with online hydrochloric acid analyser and hydrochloric acid automatic-adjusting device respectively, the concentration of the hydrochloric acid in online hydrochloric acid analyser on-line analysis hydrochloric gas absorber, the concentration of the hydrochloric acid in hydrochloric acid automatic-adjusting device and hydrochloric gas absorber is chain, controls the amount that joins the dilute hydrochloric acid in hydrochloric gas absorber.
2. a kind of method of utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid as claimed in claim 1, it is characterized in that, in step (1), described air water separator material is carbon steel liner graphite or carbon steel liner PTFE, the inner mist eliminator that increases, thickness is 300mm-600mm.
3. a kind of method of utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid as claimed in claim 1, it is characterized in that, in step (2), the splitting gas after absorbing hydrogen chloride enters into former tetrafluoroethylene production system, refines and produces TFE monomer.
4. a kind of method of utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid as claimed in claim 1, it is characterized in that, described hydrochloric gas absorber adopts graphite equipment or carbon steel inner liner polytetrafluoroethylene (PTFE) or carbon steel liner PO.
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| CN201410275750.XA CN104016304B (en) | 2014-06-19 | 2014-06-19 | A kind of method utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid |
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| CN201410275750.XA CN104016304B (en) | 2014-06-19 | 2014-06-19 | A kind of method utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111606305A (en) * | 2020-06-17 | 2020-09-01 | 山东默锐科技有限公司 | Refining method of byproduct hydrochloric acid in industrial organic synthesis |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040082822A1 (en) * | 2002-10-23 | 2004-04-29 | Moon Dong Ju | Simultaneous preparation of tetrafluoroethylene and hexafluoropropylene |
| CN102491872A (en) * | 2011-12-19 | 2012-06-13 | 天津市泰源工业气体有限公司 | Method for producing tetrafluoroethylene by diluting and cracking chlorodifuoromethane vapor |
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- 2014-06-19 CN CN201410275750.XA patent/CN104016304B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040082822A1 (en) * | 2002-10-23 | 2004-04-29 | Moon Dong Ju | Simultaneous preparation of tetrafluoroethylene and hexafluoropropylene |
| CN102491872A (en) * | 2011-12-19 | 2012-06-13 | 天津市泰源工业气体有限公司 | Method for producing tetrafluoroethylene by diluting and cracking chlorodifuoromethane vapor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111606305A (en) * | 2020-06-17 | 2020-09-01 | 山东默锐科技有限公司 | Refining method of byproduct hydrochloric acid in industrial organic synthesis |
| CN111606305B (en) * | 2020-06-17 | 2022-02-18 | 山东默锐科技有限公司 | Refining method of byproduct hydrochloric acid in industrial organic synthesis |
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Inventor after: Zhang Wei Inventor after: Gu Qiwen Inventor after: Zhou Maiyou Inventor after: Xing Lijun Inventor after: Zhu Haoyan Inventor after: Zhang Changqing Inventor after: Zhang Weigu Zhou Maiyou Xing Lijun Zhu Haoyan Zhang Changqing Tang Wenming Wen Inventor before: Gu Qiwen Inventor before: Zhou Maiyou Inventor before: Xing Lijun Inventor before: Zhu Haoyan Inventor before: Zhang Changqing Inventor before: Gu Qiwen, Zhou Maiyou, Xing Lijun, Zhu Haoyan, Zhang Changqing, Tang Wenming |
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