CN102249203A - Phosphoric acid evaporation process and device thereof - Google Patents
Phosphoric acid evaporation process and device thereof Download PDFInfo
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- CN102249203A CN102249203A CN2011101109597A CN201110110959A CN102249203A CN 102249203 A CN102249203 A CN 102249203A CN 2011101109597 A CN2011101109597 A CN 2011101109597A CN 201110110959 A CN201110110959 A CN 201110110959A CN 102249203 A CN102249203 A CN 102249203A
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- phosphoric acid
- evaporation
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- dilute phosphoric
- well heater
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention relates to a phosphoric acid evaporation process, and a device which is mainly used in the phosphoric acid evaporation process; the process comprises the following steps: allowing dilute phosphoric acid to enter the top of a graphite falling film evaporation heater, and to flow downwards in a membrane mode along the inner wall of a heat exchange tube, introducing steam from the side wall of the heater, heating the outer wall of the heat exchange tube, transferring heat to the dilute phosphoric acid in the tube through the tube wall, heating the dilute phosphoric acid during flowing, and evaporating the water. Compared with traditional circulating pump external-circulation single-effect evaporation processes, the process of the invention has high evaporation intensity, requires less heat exchangers and circulating pumps to be allocated under equal production capacity than the circulating pump external-circulation single-effect evaporation processes, and can greatly reduce investment cost, operation cost, and maintenance cost of a phosphoric acid concentration device.
Description
Technical field
The present invention relates to a kind of refining technique and device thereof of industrial chemicals, be mainly used in a kind of phosphoric acid evaporation technology.
Background technology
In the Wet-process Phosphoric Acid Production process, Phosphoric Acid Concentration is a core process, also is an operation that power consumption is maximum, the concentration of phosphoric acid solution need be concentrated to 48% ~ 50% from 20% ~ 25%.Concentrating is to adopt the technology of recycle pump outer circulation single-effect evaporation to finish, and heating medium is a saturated vapor, and steam consumption is very big, concentrates P per ton usually
2O
5Consume 1.8 ~ 2 tons of low-pressure steam approximately.In order to keep enough solid circulating rates, the power of recycle pump also consumes.Interchanger mostly is shell and tube, and evaporation capacity is less, and area is bigger.These all cause the investment of phosphoric acid concentrating device bigger, and working cost is higher, and maintenance cost is also higher.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned deficiency of the prior art, and a kind of phosphoric acid evaporation technology and device thereof are provided.
The invention provides a kind of phosphoric acid evaporation technology, it is characterized in that, may further comprise the steps:
(1) material importing dilute phosphoric acid enters by the well heater top, is provided with three layers of dish type sparger in it, makes dilute phosphoric acid be distributed to the inlet of every heat transfer tube equably, guarantees that dilute phosphoric acid can be membranaceous along the heat transfer tube inwall and evenly flow downward; (2) the dilute phosphoric acid dewatered steam feeds well heater from the well heater sidewall, and steam enters the well heater housing, and the outer wall of exchange heat pipe heats, and the dilute phosphoric acid that heat is passed in the pipe by tube wall is heated in flow process, and moisture content wherein is evaporated out; (3) water of condensation is collected steam condensate by recovery of condensation water pot or discharge; (4) the dilute phosphoric acid moisture in the process of flowing downward in the separation heat exchanging pipe constantly evaporates, concentration improves constantly, reach the concentration that needs to the exit, dilute phosphoric acid enters separator with the vapour mixture that is evaporated, in the separator is vacuum state, evaporation vapour is with dilute phosphoric acid is separated opens, and evaporation vapour is discharged from the top or the thermal source that evaporates as next stage or enter the condenser water condensation that is cooled; Dilute phosphoric acid after concentrating is discharged from the bottom, and a part enters next stage evaporation or finished product, and a part continues evaporation by the recycle pump circulation.
Described well heater, separator, condenser connect successively by pipeline, and an end of described well heater and separator is also by pipe connection recycle pump one end, and the described recycle pump the other end is by the described well heater of pipe connection top.
Described well heater is a kind of tube-type graphite falling film evaporation well heater, comprise upper tube box, Graphite cloth's liquid device, go up sealing member, graphite heat-exchanging component, lower seal and lower tube box, described graphite heat-exchanging component comprises graphite heat transfer tube, seal assembly and the tube sheet more than two, described seal assembly is arranged between graphite heat transfer tube and the tube sheet, and this graphite heat transfer tube is a modified phenolic resins die mould carbon tube.
Compare with the technology of existing recycle pump outer circulation single-effect evaporation, the characteristics of this technology are the evaporation capacity height, the interchanger that needs under the equivalent production capacity to dispose, recycle pump can reduce investment cost, working cost, the maintenance cost of phosphoric acid concentrating device significantly all less than the technology of recycle pump outer circulation single-effect evaporation.
Description of drawings
Fig. 1 is a kind of phosphoric acid evaporation technology of the present invention route map;
Fig. 2 is a used heater structure synoptic diagram in a kind of phosphoric acid evaporation technology of the present invention.
Dilute phosphoric acid 1 well heater 2 recycle pumps 3 separators 4 condensers 5 pipelines after dilute phosphoric acid b steam c water of condensation d before wherein a concentrates is condensing.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings and the specific embodiments.
As shown in Figure 1, (1) material importing dilute phosphoric acid enters by the well heater top, be provided with three layers of dish type sparger in it, make dilute phosphoric acid be distributed to the inlet of every heat transfer tube equably, guarantee that dilute phosphoric acid can be membranaceous along the heat transfer tube inwall and evenly flow downward; (2) the dilute phosphoric acid dewatered steam feeds well heater from the well heater sidewall, and steam enters the well heater housing, and the outer wall of exchange heat pipe heats, and the dilute phosphoric acid that heat is passed in the pipe by tube wall is heated in flow process, and moisture content wherein is evaporated out; (3) water of condensation is collected steam condensate by recovery of condensation water pot or discharge; (4) the dilute phosphoric acid moisture in the process of flowing downward in the separation heat exchanging pipe constantly evaporates, concentration improves constantly, reach the concentration that needs to the exit, dilute phosphoric acid enters separator with the vapour mixture that is evaporated, in the separator is vacuum state, evaporation vapour is with dilute phosphoric acid is separated opens, and evaporation vapour is discharged from the top or the thermal source that evaporates as next stage or enter the condenser water condensation that is cooled; Dilute phosphoric acid after concentrating is discharged from the bottom, and a part becomes finished product, and a part continues evaporation by the recycle pump circulation.
Described well heater 1, separator 3, condenser 4 connect successively by pipeline 5, and an end of described well heater 1 and separator 3 also is connected recycle pump 2 one ends by pipeline 5, and described recycle pump 2 the other ends connect the top of described well heater 1 by pipeline 5.
As accompanying drawing 2 described well heaters 1 is a kind of tube-type graphite falling film evaporation well heater, comprise upper tube box, Graphite cloth's liquid device, go up sealing member, graphite heat-exchanging component, lower seal and lower tube box, described graphite heat-exchanging component comprises graphite heat transfer tube, seal assembly and the tube sheet more than two, described seal assembly is arranged between graphite heat transfer tube and the tube sheet, and this graphite heat transfer tube is a modified phenolic resins die mould carbon tube.
The effect of described recycle pump 2 is to make the material circulating and evaporating and to the next stage convey materials.Select standard equipment, pattern, structure, material, sealing etc. are determined according to mass flow and material characteristic.Line with rubber or special steel are adopted in evaporation for phosphoric acid.Here adopt chemical flow-process pump.
Described separator 3 is a kind of airtight vacuum containers, and material is determined according to mass flow and material characteristic.Its effect is that the steam and the feed separation that are evaporated are come, and reaches the purpose of evaporation.Vaporised gas is discharged from separator 3 tops, enters condenser 4, and pneumatic outlet is provided with liquid barrier; The liquid material of separating is discharged from the bottom, enters recycle pump 2.
Described condenser 4 is the atmosphere spray condenser, and internal layout has the multilayer tray, gets off by spraying into water coolant, make the evaporation vapour condensation that enters, and forms vacuum.Non-condensable gases is extracted out by vacuum pump, enters atmosphere.Material determines that according to material characteristic line with rubber or glass reinforced plastic are adopted in evaporation for phosphoric acid.
Claims (3)
1. a phosphoric acid evaporation technology is characterized in that, may further comprise the steps:
(1) importing material dilute phosphoric acid (a) enters from well heater (1) top, be provided with three layers of dish type sparger in it, make dilute phosphoric acid be distributed to the inlet of every heat transfer tube equably, guarantee that dilute phosphoric acid (a) can be membranaceous along the heat transfer tube inwall and evenly flow downward;
(2) dewatered steam (b) feeds from well heater (1) sidewall, enter housing, the outer wall of exchange heat pipe heats, and heat is passed to the interior dilute phosphoric acid (a) of pipe by tube wall, dilute phosphoric acid (a) is heated in flow process, and the moisture content in the dilute phosphoric acid (a) is evaporated out;
(3) water of condensation is collected steam condensate (c) by recovery of condensation water pot or discharge;
(4) the dilute phosphoric acid moisture in the process of flowing downward in the separation heat exchanging pipe constantly evaporates, concentration improves constantly, reach the concentration that needs to the exit, dilute phosphoric acid enters separator (3) with the vapour mixture that is evaporated, in the separator (3) is vacuum state, evaporation vapour is with dilute phosphoric acid is separated opens, and evaporation vapour is discharged from the top or the thermal source that evaporates as next stage or enter the condenser water condensation that is cooled; Dilute phosphoric acid after concentrating is discharged from the bottom, and a part becomes finished product, and a part continues evaporation by the recycle pump circulation, until the phosphoric acid solution that obtains 48% ~ 50%.
2. device that is used for the phosphoric acid evaporation technology, it is characterized in that, comprise well heater (1), recycle pump (2), separator (3), condenser (4), pipeline (5), described well heater (1), separator (3), condenser (4) connect successively by pipeline (5), the end of described well heater (1) and separator (3) is connected recycle pump (2) one ends by pipeline (5), and described recycle pump (2) the other end connects the top of described well heater (1) by pipeline (5).
3. a kind of device that is used for the phosphoric acid evaporation technology according to claim 2, it is characterized in that, described well heater (1) is a kind of tube-type graphite falling film evaporation well heater, comprise upper tube box, Graphite cloth's liquid device, go up sealing member, graphite heat-exchanging component, lower seal and lower tube box, described graphite heat-exchanging component comprises graphite heat transfer tube, seal assembly and the tube sheet more than two, described seal assembly sealing is arranged between graphite heat transfer tube and the tube sheet, and this graphite heat transfer tube is a modified phenolic resins die mould carbon tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101109597A CN102249203A (en) | 2011-04-29 | 2011-04-29 | Phosphoric acid evaporation process and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101109597A CN102249203A (en) | 2011-04-29 | 2011-04-29 | Phosphoric acid evaporation process and device thereof |
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| CN102249203A true CN102249203A (en) | 2011-11-23 |
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| CN2011101109597A Pending CN102249203A (en) | 2011-04-29 | 2011-04-29 | Phosphoric acid evaporation process and device thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103224243A (en) * | 2013-05-06 | 2013-07-31 | 张健 | Continuous production method of liquid alkali and falling-film evaporator |
| CN104477865A (en) * | 2014-12-29 | 2015-04-01 | 安徽新中远化工科技有限公司 | Condensate water recycling system |
| CN104774143A (en) * | 2014-01-14 | 2015-07-15 | 曾舟华 | Cycle recovery method of formic acid solvent in metronidazole production process |
| CN104973581A (en) * | 2014-04-09 | 2015-10-14 | 中国石油化工股份有限公司 | Treatment method of phosphoric acid waste liquid |
| CN105363321A (en) * | 2015-11-20 | 2016-03-02 | 太仓市振锋化工设备有限公司 | Hydrogen chloride gas absorption device |
| CN105953634A (en) * | 2016-05-12 | 2016-09-21 | 太仓市顺邦防腐设备有限公司 | Graphite pipe with heat exchange function |
| CN111256493A (en) * | 2019-06-05 | 2020-06-09 | 雷波凯瑞磷化工有限责任公司 | Water film cooling method and device for recovering trace yellow phosphorus in yellow phosphorus tail gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3522833A (en) * | 1964-07-21 | 1970-08-04 | Occidental Res & Eng | Production of phosphoric acids |
| CN101445226A (en) * | 2008-11-27 | 2009-06-03 | 中国石化集团南京设计院 | Novel technology of two-effect evaporation of phosphoric acid with wet method |
| CN101935077A (en) * | 2010-08-27 | 2011-01-05 | 南通京通石墨设备有限公司 | Waste acid concentration multistage treatment method |
| CN201760113U (en) * | 2010-09-03 | 2011-03-16 | 南通京通石墨设备有限公司 | Falling film evaporation heating device graphite liquid distributing device |
-
2011
- 2011-04-29 CN CN2011101109597A patent/CN102249203A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3522833A (en) * | 1964-07-21 | 1970-08-04 | Occidental Res & Eng | Production of phosphoric acids |
| CN101445226A (en) * | 2008-11-27 | 2009-06-03 | 中国石化集团南京设计院 | Novel technology of two-effect evaporation of phosphoric acid with wet method |
| CN101935077A (en) * | 2010-08-27 | 2011-01-05 | 南通京通石墨设备有限公司 | Waste acid concentration multistage treatment method |
| CN201760113U (en) * | 2010-09-03 | 2011-03-16 | 南通京通石墨设备有限公司 | Falling film evaporation heating device graphite liquid distributing device |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103224243A (en) * | 2013-05-06 | 2013-07-31 | 张健 | Continuous production method of liquid alkali and falling-film evaporator |
| CN104774143A (en) * | 2014-01-14 | 2015-07-15 | 曾舟华 | Cycle recovery method of formic acid solvent in metronidazole production process |
| CN104774143B (en) * | 2014-01-14 | 2016-08-24 | 曾舟华 | The circulation recovery method of formic acid solvent in metronidazole production process |
| CN104973581A (en) * | 2014-04-09 | 2015-10-14 | 中国石油化工股份有限公司 | Treatment method of phosphoric acid waste liquid |
| CN104477865A (en) * | 2014-12-29 | 2015-04-01 | 安徽新中远化工科技有限公司 | Condensate water recycling system |
| CN105363321A (en) * | 2015-11-20 | 2016-03-02 | 太仓市振锋化工设备有限公司 | Hydrogen chloride gas absorption device |
| CN105953634A (en) * | 2016-05-12 | 2016-09-21 | 太仓市顺邦防腐设备有限公司 | Graphite pipe with heat exchange function |
| CN111256493A (en) * | 2019-06-05 | 2020-06-09 | 雷波凯瑞磷化工有限责任公司 | Water film cooling method and device for recovering trace yellow phosphorus in yellow phosphorus tail gas |
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Application publication date: 20111123 |