CN104016304B - A kind of method utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid - Google Patents
A kind of method utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid Download PDFInfo
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- CN104016304B CN104016304B CN201410275750.XA CN201410275750A CN104016304B CN 104016304 B CN104016304 B CN 104016304B CN 201410275750 A CN201410275750 A CN 201410275750A CN 104016304 B CN104016304 B CN 104016304B
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Abstract
The invention discloses a kind of method utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid, comprise the following steps: the splitting gas in tetrafluoroethylene production carries out being cooled to 160-190 DEG C through quencher by (1), splitting gas after cooling enters condenser, be 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 be not condensed in condenser, and isolated gas enters into the hydrochloric gas absorber that mass concentration is 0.5-3% dilute hydrochloric acid in air water separator, 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 is separated; Hydrochloric gas absorber is connected with online hydrochloric acid analyser and hydrochloric acid automatic-adjusting device respectively.Processing method of the present invention is simple and easy, stable, effective to absorbing hydrogen chloride gas, and obtained hydrochloric acid product concentration is high, quality good, avoids hydrogen chloride gas discharge and causes environmental pollution.<pb pnum="1" />
Description
Technical field
The present invention relates to a kind of processing method utilizing chemical industry waste gas to prepare industrial chemicals of chemical technology field, especially a kind of processing method utilizing zellon byproduct hydrogen chloride gas to prepare hydrochloric acid.
Background technology
Along with the development of society and the continuous progress of Chemical Engineering Technology, the comprehensive development and utilization of people to chemical emission is more and more paid attention to.The industrialized producing technology mainly chloroform method of TFE (tetrafluoroethylene).This method, since nineteen forty-one starts pilot scale, has been the industrial method generally adopted always.First it obtain difluorochloromethane by chloroform and anhydrous hydrogen fluoride reaction, and the latter is hot cracked again, and namely dehydrochlorination obtains tetrafluoroethylene.The dilute hydrochloric acid of the condensation by-product about 15% of splitting gas in domestic existing tetrafluoroethylene production equipment, cannot direct marketing but the dilute hydrochloric acid utility value of 15% is not high, and improve concentration to reach and the quality standard of concentrated hydrochloric acid of direct marketing can need consume a large amount of hydrogen chloride gas, improve 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 utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid, the method is the characteristic utilizing 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, effective to absorbing hydrogen chloride gas, and obtained hydrochloric acid product concentration is high, quality good, thus avoids hydrogen chloride gas discharge to cause environmental pollution, can make full use of resource, reduce 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 being produced by tetrafluoroethylene carries out being 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 be not condensed in condenser, and isolated gas enters into the hydrochloric gas absorber that mass concentration is 0.5-3% dilute hydrochloric acid is housed in air water separator, 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 is separated;
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, inner increase fibre web mist eliminator, 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 of the dilute hydrochloric acid joined in hydrochloric gas absorber.
In step (2), the splitting gas after absorbing hydrogen chloride enters into former tetrafluoroethylene production system, carries out refining production 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 relative to prior art:
(1) technique is simple, easily operation and control, process runs well;
(2) device structure is reasonable, invests little, instant effect;
(3) have employed condensed in two stages, condensed moisture from the method for, absorbing hydrogen chloride gas, make the absorbing hydrogen chloride gas of tetrafluoroethylene by-product complete, and reclaimed a large amount of water, effectively protect environment, take full advantage of resource again;
(4) obtained hydrochloric acid product concentration is high, quality good, can ensure that the concentration of hydrochloric acid prepared reaches the requirement of commodity concentrated hydrochloric acid.
Accompanying drawing explanation
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 to explain the present invention, not limiting 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) volume ratio of each composition in being produced by tetrafluoroethylene is: tetrafluoroethylene monomer 15-25%, difluorochloromethane 14-24%, hydrogenchloride 10-15%, the splitting gas of water vapor 36-61%, carry out being cooled to 180 DEG C through quencher, the splitting gas after cooling enters condenser, be cooled to 70 DEG C, the water vapor condensation Cheng Shui of 70%, the water of condensation enters air water separator, by water and gas delivery;
(2) splitting gas be not condensed in condenser, and isolated gas enters into the hydrochloric gas absorber that mass concentration is 1.5% dilute hydrochloric acid is housed in air water separator, hydrogen chloride gas is absorbed by dilute hydrochloric acid, generating concentration is the concentrated hydrochloric acid of 32wt%, and concentrated hydrochloric acid is transmitting system after separator is separated; 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 the amount of the dilute hydrochloric acid joined in hydrochloric gas absorber, achieve on-line automatic regulation and control.Splitting gas after absorbing hydrogen chloride enters into former tetrafluoroethylene production system, carries out refining production TFE monomer.
Wherein, air water separator material adopts carbon steel liner graphite, and inner increase fibre web mist eliminator, thickness is 500mm.Carry fine liquid droplet in the gas phase secretly, 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 under gravity, point of crossing along braided wires twine and silk moves downward, continue the droplet carried 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, inside due to whole mesh mist eliminator is filled with the droplet absorbed, enhance the adsorptive power of independent metal or engineering plastics silk, when making normally to work, the demist rate of demist silk screen increases substantially, minimum droplet can be adsorbed effectively and deviate 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) volume ratio of each composition in being produced by tetrafluoroethylene is: tetrafluoroethylene monomer 15-25%, difluorochloromethane 14-24%, hydrogenchloride 10-15%, the splitting gas of water vapor 36-61%, carry out being cooled to 160 DEG C through quencher, the splitting gas after cooling enters condenser, be cooled to 60 DEG C, the water vapor condensation Cheng Shui of 80%, the water of condensation enters air water separator, by water and gas delivery;
(2) splitting gas be not condensed in condenser, and isolated gas enters into the hydrochloric gas absorber that mass concentration is 0.5% dilute hydrochloric acid is housed in air water separator, hydrogen chloride gas is absorbed by dilute hydrochloric acid, generating concentration is the concentrated hydrochloric acid of 34wt%, and concentrated hydrochloric acid is transmitting system after separator is separated; 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 the amount of the dilute hydrochloric acid joined in hydrochloric gas absorber, achieve on-line automatic regulation and control.Splitting gas after absorbing hydrogen chloride enters into former tetrafluoroethylene production system, carries out refining production TFE monomer.
Wherein, air water separator material adopts carbon steel liner PTFE, inner increase fibre web mist eliminator, 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) volume ratio of each composition in being produced by tetrafluoroethylene is: tetrafluoroethylene monomer 15-25%, difluorochloromethane 14-24%, hydrogenchloride 10-15%, the splitting gas of water vapor 36-61%, carry out being cooled to 190 DEG C through quencher, the splitting gas after cooling enters condenser, be cooled to 90 DEG C, the water vapor condensation Cheng Shui of 60%, the water of condensation enters air water separator, by water and gas delivery;
(2) splitting gas be not condensed in condenser, and isolated gas enters into the hydrochloric gas absorber that mass concentration is 0.5% dilute hydrochloric acid is housed in air water separator, hydrogen chloride gas is absorbed by dilute hydrochloric acid, generating concentration is the concentrated hydrochloric acid of 31wt%, and concentrated hydrochloric acid is transmitting system after separator is separated; 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 the amount of the dilute hydrochloric acid joined in hydrochloric gas absorber, achieve on-line automatic regulation and control.Splitting gas after absorbing hydrogen chloride enters into former tetrafluoroethylene production system, carries out refining production TFE monomer.
Wherein, air water separator material adopts carbon steel liner PTFE, inner increase fibre web mist eliminator, 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 being produced by tetrafluoroethylene carries out being 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 be not condensed in condenser, and isolated gas enters into the hydrochloric gas absorber that mass concentration is 0.5-3% dilute hydrochloric acid is housed in air water separator, 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 is separated;
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 of the dilute hydrochloric acid joined in hydrochloric gas absorber.
2. a kind of method 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, inner increase mist eliminator, thickness is 300mm-600mm.
3. a kind of method 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, carries out refining production TFE monomer.
4. a kind of method utilizing the hydrogen chloride gas of tetrafluoroethylene by-product to prepare concentrated hydrochloric acid as claimed in claim 1, is characterized in that, described hydrochloric gas absorber adopts graphite equipment or carbon steel inner liner polytetrafluoroethylene 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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| CN104016304B true CN104016304B (en) | 2015-11-04 |
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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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