CN101108724A - Manufacture method of extracting pure tritium from raw material of light water (heavy water) containing tritium - Google Patents
Manufacture method of extracting pure tritium from raw material of light water (heavy water) containing tritium Download PDFInfo
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Abstract
The invention relates to the production method with tritium-containing light water (heavy water) as raw materials to extract pure tritium, which comprises the following processing steps: A. hydrogen-water (liquid) exchange stage adopts cascade of two-stage six-cascade to carry out liquid catalysis exchange reaction on the hydrogen and the tritium-containing light water; B. low temperature distillation stage adopts the three-stage cascade methods such as cryosorption, liquid hydrogen (tritium) distillation and recovery. The invention is characterized in that: the hydrogen-water (liquid) exchange stage adopts two-stage six-cascade hydrogen-water (liquid) exchange technology, which is simple in technology process, easy in operation, safe in production, easy in detritiation from light water (heavy water) and has extraction ratio reaching over 95 per cent; the low temperature distillation adopts double refrigerating technology (helium liquefaction refrigeration and nitrogen liquefaction refrigeration), OP conversion technology, catalytic synthesis combustion technology and dismutation technology, which reduces the consumption of the raw materials and the energy sources, reduces the discharge of airborne radioactive effluent, greatly lightens the environmental protection and extracts tritium with fineness of 99 per cent and 99.9 per cent at most.
Description
Technical field the present invention relates to a kind of utilization and contains the production method that tritium light-water (heavy water) extracts pure tritium.
Background technology is present, and the technology of extracting pure tritium abroad from contain tritium light-water (heavy water) mainly contains hydrogen-water (liquid) exchange process and co-electrolysis liquid-phase catalysis exchange process.Utilize hydrogen-water (liquid) permutoid reaction to extract pure tritium, for realizing the crucial hydrophobic catalyst that depends primarily on excellent performance of its reaction.The hydrophilic catalyzer of early stage development is met the liquid water poisoning and is lost activity, and therefore, needs carry out gas phase catalysis exchange (VPCE) under about 200 ℃ temperature condition, just the gas of often saying/vapour exchange (heat exchange).Adopt the VPCE method to extract that pure tritium need evaporate repeatedly to containing the tritium heavy water, overheated, condensation, its technical process complexity.In order to carry out detritiation from heavy water with liquid phase hydrogen-water permutoid reaction at normal temperatures and pressures, countries such as Canada, Japan, India have carried out the development of hydrophobic catalyst, and built the testing apparatus of liquid-phase catalysis exchange (LPCE) or co-electrolysis liquid-phase catalysis exchange (CECE), carry out the proof test of detritiation from heavy water.Gas/liquid exchange (cold exchange) mode of just often saying is tested.Adopt LPCE or the CECE method is simpler, easy to operate than VPCE method technology, cost is lower.
Utilize hydrogen-water (liquid) permutoid reaction, make to contain tritium light-water (heavy water) and contact with the deuterium gas phase of following current in exchange reactor, the tritium in the liquid phase is by dilution, and the tritium enrichment in the gas phase is got up, the latter again through the low-temperature distillation tower with tritium in addition enrichment concentrate.States such as the external U.S., Japan, Canada have carried out hydrogen-water (liquid) exchange process is extracted pure tritium in conjunction with the low-temperature distillation method technological experiment research.
It is the production method that raw material extracts pure tritium to contain tritium light-water (heavy water) that summary of the invention the object of the present invention is to provide a kind of, and can obtain purity with this method is 99% pure tritium.
The present invention is that raw material extracts pure tritium and mainly comprises following process steps to contain tritium light-water (heavy water):
1, fs-hydrogen-water (liquid) switching phase
Adopt two sections six grades of compact cascade types to hydrogen (deuterium) gas with contain tritium light-water (heavy water) and carry out the liquid-phase catalysis permutoid reaction, each section is provided with three grades of exchange reactors, catalyzer in the exchange reactor adopts hydrophobic catalyst, containing pressurized hydrogen (deuterium) aerosol of tritium light-water (heavy water) changes into the mist droplet following current and passes through catalytic bed from top to bottom, in catalytic bed, carry out hydrogen-water (liquid) permutoid reaction, tritium is transferred to the gas phase from liquid phase, this flow process is to carry out under 40 ℃～50 ℃ temperature and 0.1MPa～0.25Mpa pressure condition, and the permutoid reaction formula is:
HTO(L)+H
2(G)H
2O(L)+HT(G)
(DTO(L)+D
2(G)D
2O(L)+DT(G))
Each section and each order reaction finish to carry out gas-liquid separation by cooling, and gas separated is sent into the low-temperature distillation stage, and liquid heat enters next stage and next section.
The present invention can deviate from the tritium more than 95%, thereby purify light-water (heavy water) by carrying out two sections six grades hydrogen-water (liquid) exchange to containing tritium light-water (heavy water).This flow process be low temperature (40 ℃～50 ℃) low pressure (0.1MPa～0.25MPa) carry out solution-air two-phase multi-stage following current catalytic exchange under the condition, technical process is simple, and is easy to operate, the equipment complexity is lower, system easily seals.Tritium concentration is no more than the tritium concentration in the heap light-water (heavy water) all the time in the light-water in the technological process (heavy water), and is to reduce step by step, produces safelyr, is easy to light-water (heavy water) and takes off tritium.
2, subordinate phase-low-temperature distillation stage
This stage comprises cryogenic absorption, liquid hydrogen (deuterium) distillation, reclaims three technological processs.
(1) cryogenic absorption
Carry out the frozen drying processing to containing hydrogen tritide (deuterium) gas, remove O
2, N
2Behind impurity, carry out just (O) attitude-(P) the attitude conversion second month in a season (being that OP transforms) of hydrogen (deuterium) again, continue cooling then, when temperature drops to-247 ℃～-249 ℃, will contain the tritium gas liquid mixture and send into low-temperature distillation;
(2) liquid hydrogen (deuterium) low-temperature distillation
Carry out distillation just to containing the tritium gas liquid mixture, just the rectifying tower temperature in is-247 ℃～-249 ℃, the cat head temperature of lower is-249 ℃～-251 ℃, column bottom temperature is-243 ℃～-245 ℃, pressure is 0.35MPa～0.50MPa, and distillation is just changed tritium with hydrogen (deuterium) and is enriched to 0.02%HT (DT) by 0.5PPmHT (DT); Hydrogen (deuterium) gas of discharging returns hydrogen-water (liquid) switching phase as circulation gas after the circulation gas storage tank expands; The HT (DT) that obtains enrichment is carried out the essence distillation, the rectifying tower temperature in is-247 ℃～-249 ℃, and tower top temperature is-248 ℃～-250 ℃, and column bottom temperature is-245 ℃～-247 ℃, pressure is 0.35MPa～0.45MPa, and it further is enriched to 95%HT (DT) from 0.02%HT (DT); The hydrogen (deuterium) that is concentrated to 95%HT (DT) is changed under tritium is warming up to 40 ℃～60 ℃ through heat exchange the condition and is carried out disproportionation reaction, catalyst system therefor is Pt, Pd or Ni/Cr2O3, be cooled to-246 ℃～-248 ℃ through heat exchange again after reaction finishes and proceed smart distillation, be concentrated to 99%T
2
Because disproportionation reaction: 2HT H
2+ T
2(2DT D
2+ T
2) can not carry out automatically, and the tritium in the hydrogen (deuterium) almost completely exists with HT (DT) form, so produce pure T with liquid hydrogen (deuterium) distillation
2Must make HT (DT) change into H by disproportionation reaction
2(D
2) and T
2
(3) reclaim
Reclaim and adopt catalysis synthetic combustion technology, lean gas of discharging from first rectifying tower cat head top and air mixed burning compile after the light-water of generation (the containing micro-deuterium) condensation.
Helium liquefaction refrigeration and nitrogen liquefying refrigerating are adopted in cooling in liquid hydrogen (deuterium) still-process.
The helium liquefaction refrigeration plant adopts the one-level expansion type helium liquefaction refrigeration plant (pressure is 1.5Mpa～2.5MPa, and temperature is-266 ℃～-268 ℃) of band nitrogen precooling.
Nitrogen liquefying refrigerating device adopts one-level expansion type nitrogen liquefying refrigerating device (pressure is 3.5MPa～4.5MPa, and temperature is-193 ℃～-198 ℃).
The present invention compared with prior art has following characteristics:
1, extract pure tritium from contain tritium light-water (heavy water) and adopt two sections six grades hydrogen-water (liquid) switching technology, technical process is simple, and is easy to operate, and the equipment complexity is lower, and system easily seals.The tritium concentration of light-water in the technological process (heavy water) is no more than the tritium concentration in the stockpile light-water (heavy water) all the time, and is to reduce step by step, and production safety is easy to light-water (heavy water) and takes off tritium.More than total extraction rate reached to 95% of this method to tritium in the stockpile light-water (heavy water), improved more than 25%, so promptly increased the output of pure tritium, reduced cost again than prior art.
2, this method wide accommodation is applicable to that promptly the tritium light-water that contains of light water reactor extracts pure tritium, is applicable to that again the tritium heavy water that contains of heavy water reactor extracts pure tritium, and the liquid radiation effluent (being nuclear waste) that can also adapt to power producer extracts pure tritium.Have than wide adaptability than prior art.
3, low-temperature distillation has adopted two Refrigeration Techniques (being helium liquefaction refrigeration and nitrogen liquefying refrigerating), OP transformation technology, catalysis synthetic combustion technology and disproportionation technology etc.Had than much progress than prior art, reduced the consumption of helium, also reduced the consumption of the energy, reduced the discharging of airborne activity effluent (being tail gas), alleviated environmental pollution greatly, and improve the purity of pure tritium, also reduced pure tritium unit(TU) cost.
4, be raw material to contain tritium light-water (heavy water), by the pure tritium that this method is extracted, its purity is 99%, can reach 99.9%.The cost of unit product reduces more than 10% than prior art.
5, adopt the hydrophobic catalyst of efficient, activity stabilized, the anti-β irradiation of performance, reparation technology good reproducibility, and test of many times unanimity as a result.
Description of drawings Fig. 1 is technological process of production figure of the present invention.
The invention will be further described below in conjunction with accompanying drawing for embodiment:
Production process of the present invention is two stages, and the fs is hydrogen-water (liquid) switching phase, and subordinate phase is the low-temperature distillation stage.
1, the fs: hydrogen-water (liquid) switching phase adopts two sections six grades of Cascading Methods.
Stockpile light-water (heavy water), organic impurity inorganic because of containing therefore must be through purifying treatment before entering system.Removing inorganic, organic impurity can adopt methods such as mechanical filter, charcoal absorption, ion-exchange or several method to be used in combination respectively according to different situations.
Stockpile light-water (heavy water) after the purification enters system and injects feed sump (101), store to groove liquid level meter 2/3 place, open feedstock pump (102), pressure is 0.1MPa～0.2MPa, after raw material heater via (103) heating, temperature is 40 ℃～50 ℃, enters the exchange reactor (104) of the fs first step.Meanwhile, raw material light-water (heavy water) is injected into storage tank (130), store to groove liquid level meter 2/3 place, open valve, light-water (heavy water) flows to hydrogen (deuterium gas) producer (129), open hydrogen (deuterium gas) producer (129), pressure is 0.15MPa～0.25MPa, (the deuterium stream advances mixing tank (128) to hydrogen, after mixing, circulation gas with subordinate phase circulation gas storage tank (228) enters first section gas heater (114) respectively, second section gas heater (127), temperature is 45 ℃～55 ℃, enters divider (113) separately then again respectively, (126), hydrogen (deuterium gas) is that parallel connection enters each section exchange reactors at different levels.Contain pressurized hydrogen (deuterium) aerosol of tritium light-water (heavy water) and change into the catalytic bed that exchange reactor (104) is passed through in the mist droplet following current from top to bottom, stockpile light-water (heavy water) and hydrogen (deuterium gas) carry out hydrogen-water (liquid) permutoid reaction on hydrophobic catalyst, the tritium in the stockpile light-water (heavy water) is converted into vapour phase hydrogenation tritium (deuterate tritium).Gas-liquid is after cooling separator (105) separates, temperature is 20 ℃～30 ℃, contain hydrogen tritide gas (deuterium gas) and enter house steward, tritium light-water (tritium heavy water) enters side heater (106), tritium light-water after the heating (tritium heavy water) enters second stage exchange reactor (107), through cooling separator (108), side heater (109), third stage exchange reactor (110) and then through cooling separator (111), the tritium light-water after the separation (tritium heavy water) flows into process tank (112) then.Store to groove liquid level meter 2/3 place, open line pump (115), pressure is 0.1MPa～0.2MPa, enters the exchange reactor (117) of second section fourth stage after side heater (116) heating.Thereafter three-stage process is identical with first section, cooling separators at different levels are separated contains hydrogen tritide gas (deuterium gas) and all enters and contain hydrogen tritide (deuterium) gas house steward, (pressure is that 0.4MPa～0.6MPa) enters the moisture eliminator (202) of being with refrigerator (203) through hydrogen (deuterium) air compressor (201) compression back, temperature is-30 ℃～-45 ℃, and hydrogen tritide (deuterium) gas that contains after the dehydration enters the ice chest of subordinate phase.From the isolated liquid collecting of last step cooling separator (124) in purifying storage tank (125).
2, subordinate phase: the low-temperature distillation stage is adopted cryogenic absorption, liquid hydrogen (deuterium) distills and reclaim three sections Cascading Methods.
Cryogenic absorption: hydrogen tritide (deuterium) gas of being collected by the fs that contains compresses through hydrogen (deuterium) air compressor (201), pressure is 0.4MPa～0.6MPa, enter the moisture eliminator (202) of subsidiary refrigerator (203) then, temperature is-30 ℃～-45 ℃, hydrogen tritide (deuterium) gas that contains after the dehydration enters ice chest interior interchanger (204) and liquid nitrogen interchanger (205), enter low-temperature adsorber (206) again, remove O
2, N
2Carry out OP and transform Deng entering OP convertor (207) behind the impurity, after passing through interchanger (208) again and continuing cooling, when temperature is reduced to-247 ℃～-249 ℃, contain the tritium gas liquid mixture and enter rectifying tower (209) middle part just.
Liquid hydrogen (deuterium) distillation: contain the tritium gas liquid mixture and enter rectifying tower (209) middle part just, just the rectifying tower temperature in is-247 ℃～-249 ℃, the cat head temperature of lower is-249 ℃～-251 ℃, column bottom temperature is-243 ℃～-245 ℃, pressure is 0.35MPa～0.50MPa, it is descending that liquid phase imports the phegma continuation, and it is up that gas phase imports upstream.Distillation is just changed tritium with hydrogen (deuterium) and is enriched to 0.02%HT (DT) by 0.5PPmHT (DT), first spissated enrichment contains tritium liquid and flows at the bottom of the tower, and then inflow backflash (210), store to groove liquid level meter 2/3 place, open cryopump (211), first spissated enrichment is contained tritium liquid through interchanger (212) input rectifying tower (213) middle and upper part.The rectifying tower temperature in is-247 ℃～-249 ℃, and tower top temperature is-248 ℃～-250 ℃, and column bottom temperature is-245 ℃～-247 ℃, and pressure is 0.35MPa～0.45MPa, and in rectifying tower, liquid phase is descending, and gas phase is up.Just dense rich tritium liquid further concentrates, be concentrated to 95%HT (DT) from 0.02%HT (DT) enrichment, draw 95%HD (DT) in the middle and lower part of smart distillation tower, after interchanger (214) heats up, enter disproportionation reactor (226) and carry out disproportionation reaction, the disproportionation reaction temperature is 40 ℃～60 ℃, and the product after the disproportionation turns back to the middle and lower part of smart distillation tower through interchanger (214), and temperature is-246 ℃～-248 ℃, by the rectifying separation of rectifying tower, T
2Be enriched to 99%, go out, input pure tritium storage tank (227) after interchanger (214) heats up gasification by the rectifying tower tower bottom flow.
The gas phase of smart distillation tower (213) is up, after cat head interchanger condensation separation, draw by cat head and to enter rectifying tower (209) middle and lower part just, dilution to contain hydrogen tritide (deuterium) gas up and continue dilution in tower, diluted poor hydrogen tritide (deuterium) gas of the overwhelming majority is drawn in the cat head bottom, flow into circulation gas storage tank (228) through interchanger (208), interchanger (204), poor hydrogen tritide (deuterium) gas that circulates then returns fs circular flow.The poor hydrogen tritide of small portion (deuterium) gas continues up, condensation separation in the interchanger of cat head top, and seldom Bu Fen hydrogen (containing micro-deuterium) gas is drawn recovery stage from cat head.
Reclaim: hydrogen (the containing micro-deuterium) gas of drawing from first rectifying tower cat head top enters tail gas synthesis reactor (229), meanwhile, by oilless air compressor (233) inhaled air, after filter (234) filtration, also enter tail gas synthesis reactor (229), enter tail gas synthesis reactor (229) catalytic bed after air and hydrogen (deuterium gas) mix and carry out catalyst combustion reaction, temperature is 100 ℃～200 ℃, pressure is 0.01MPa～0.02MPa, water generation reaction steam, through cooler condenser (230) condensation, temperature is 20 ℃～30 ℃, and liquid phase flows into light-water storage tank (235), gas phase flows into condensation refrigerator (231) condensation of band refrigerator (232), temperature is-10 ℃～0 ℃, and liquid phase flows into light-water storage tank (235), gas phase emptying.
In the low-temperature distillation process, helium liquefaction refrigeration and nitrogen liquefying refrigerating have been adopted, helium liquefaction refrigerating helium is from the helium steel cylinder and be stored in the helium jar (215), the helium of helium compressor (216) suction helium jar (215) lining, (pressure is that the helium of 1.5MPa～2.5MPa) is through helium heat exchanger (217) for compression back, liquid nitrogen interchanger (218), interchanger at the bottom of distillation tower (209) tower at the beginning of entering, evaporator tower still liquid, cooling back helium divides two-way, one the tunnel removes rectifying tower (213) cat head interchanger through interchanger (218), turbo-expander (219) is removed on another road, (temperature is-266 ℃～-268 ℃) enters rectifying tower (209) cat head top interchanger just behind the swell refrigeration, converges with last road after going out tower, through liquid nitrogen interchanger (218) and helium heat exchanger (217), return helium jar (215), circular flow after reclaiming cold.
The nitrogen of nitrogen liquefying refrigerating is from the nitrogen steel cylinder and be stored in the nitrogen pot (220), the nitrogen of nitrogen compressor (221) suction nitrogen pot (220) lining, (pressure is that the nitrogen of 3.5MPa～4.5MPa) enters nitrogen heat exchanger (222) for compression back, cooling back nitrogen divides two-way, one the tunnel removes liquid nitrogen tank (225) through nitrogen heat exchanger (223), turbo-expander (224) is removed on another road, (temperature is-193 ℃～-199 ℃) enters liquid nitrogen tank (225) behind the swell refrigeration, liquid/gas separates the back liquid nitrogen and divides two-way, one the tunnel removes liquid nitrogen interchanger (218), the nitrogen of evaporation returns liquid nitrogen tank (225) through helium heat exchanger (217), liquid nitrogen interchanger (205) is removed on another road, the nitrogen of evaporation returns liquid nitrogen tank (225) through interchanger (204), through liquid nitrogen tank (225) isolating nitrogen denitrification gas interchanger (223), return nitrogen pot (220), circular flow through nitrogen heat exchanger (222).
Claims (4)
1. be the production method that raw material extracts pure tritium to contain tritium light-water (heavy water), it is characterized in that comprising following process steps:
A, fs-hydrogen-water (liquid) switching phase
Adopt two sections six grades of compact cascade types to hydrogen with contain the tritium light-water and carry out the liquid-phase catalysis permutoid reaction, each section is provided with three grades of exchange reactors, catalyzer in the exchange reactor adopts hydrophobic catalyst, containing pressurized hydrogen (deuterium) aerosol of tritium light-water (heavy water) changes into the mist droplet following current and passes through catalytic bed from top to bottom, in catalytic bed, carry out hydrogen-water (liquid) permutoid reaction, tritium is transferred to the gas phase from liquid phase, this flow process is to carry out under 40 ℃～50 ℃ temperature and 0.1MPa～0.25Mpa pressure condition, each section and each order reaction finish to carry out gas-liquid separation by cooling, gas separated is sent into the low-temperature distillation stage, and liquid heat enters next stage and next section;
B, subordinate phase-low-temperature distillation stage
(1) cryogenic absorption
Carry out the frozen drying processing to containing hydrogen tritide (deuterium) gas, remove O
2, N
2Behind impurity, carry out just (O) attitude-(P) the attitude conversion second month in a season (being that OP transforms) of hydrogen (deuterium) again, continue cooling then, when temperature drops to-247 ℃～-249 ℃, will contain the tritium gas liquid mixture and send into the low-temperature distillation section;
(2) liquid hydrogen (deuterium) low-temperature distillation
Carry out distillation just to containing the tritium gas liquid mixture, just the rectifying tower temperature in is-247 ℃～-249 ℃, the cat head temperature of lower is-249 ℃～-251 ℃, column bottom temperature is-243 ℃～-245 ℃, pressure is 0.35MPa～0.50MPa, and distillation is just changed tritium with hydrogen (deuterium) and is enriched to 0.02%HT (DT) by 0.5PPmHT (DT); Hydrogen (deuterium) gas of discharging returns hydrogen-water (liquid) switching phase as circulation gas after the circulation gas storage tank expands; The HT (DT) that obtains enrichment is carried out the essence distillation, the rectifying tower temperature in is-247 ℃～-249 ℃, and tower top temperature is-248 ℃～-250 ℃, and column bottom temperature is-245 ℃～-247 ℃, pressure is 0.35MPa～0.45MPa, and it further is enriched to 95%HT (DT) from 0.02%HT (DT); Spissated 95%HT (DT) is warming up to through heat exchange under 40 ℃～60 ℃ the condition and carries out disproportionation reaction, and catalyst system therefor is Pt, Pd or Ni/Cr203, is cooled to-246 ℃～-248 ℃ through heat exchange again after reaction finishes and proceeds smart distillation, is concentrated to 99%T
2
(3) reclaim
Reclaim and adopt catalysis synthetic combustion technology, lean gas of discharging from first rectifying tower cat head top and air mixed burning compile after the light-water of generation (the containing micro-deuterium) condensation.
2. according to claim 1 is the production method that raw material extracts pure tritium to contain tritium light-water (heavy water), it is characterized in that helium liquefaction refrigeration and nitrogen liquefying refrigerating are adopted in the cooling in liquid hydrogen (deuterium) still-process.
3. according to claim 2 is the production method that raw material extracts pure tritium to contain tritium light-water (heavy water), it is characterized in that the helium liquefaction refrigeration plant adopts the one-level expansion type helium liquefaction refrigeration plant of band nitrogen precooling.
4. according to claim 2 is the production method that raw material extracts pure tritium to contain tritium light-water (heavy water), it is characterized in that nitrogen liquefying refrigerating device adopts one-level expansion type nitrogen liquefying refrigerating device.
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| CN101850272A (en) * | 2010-06-22 | 2010-10-06 | 中国工程物理研究院核物理与化学研究所 | Method for preparing hydrophobic catalyst by freezing molding |
| CN101985349B (en) * | 2009-07-29 | 2013-04-10 | 大连世纪新源技术开发有限公司 | Production method for preparing deuterium depleted water |
| CN104318968A (en) * | 2014-08-21 | 2015-01-28 | 中国工程物理研究院核物理与化学研究所 | Process and device for treating tritium-containing water in nuclear power plant based on electrolysis and low-temperature distillation cascade process |
| CN104828778A (en) * | 2015-05-06 | 2015-08-12 | 中国工程物理研究院核物理与化学研究所 | Simultaneous upgrading and tritium removal process of heavy water |
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| CN101985349B (en) * | 2009-07-29 | 2013-04-10 | 大连世纪新源技术开发有限公司 | Production method for preparing deuterium depleted water |
| CN101850272A (en) * | 2010-06-22 | 2010-10-06 | 中国工程物理研究院核物理与化学研究所 | Method for preparing hydrophobic catalyst by freezing molding |
| CN101850272B (en) * | 2010-06-22 | 2011-12-14 | 中国工程物理研究院核物理与化学研究所 | Method for preparing hydrophobic catalyst by freezing molding |
| CN104318968A (en) * | 2014-08-21 | 2015-01-28 | 中国工程物理研究院核物理与化学研究所 | Process and device for treating tritium-containing water in nuclear power plant based on electrolysis and low-temperature distillation cascade process |
| CN104828778A (en) * | 2015-05-06 | 2015-08-12 | 中国工程物理研究院核物理与化学研究所 | Simultaneous upgrading and tritium removal process of heavy water |
| CN105609152A (en) * | 2016-03-25 | 2016-05-25 | 中国工程物理研究院材料研究所 | System for realizing detritiation of water and realizing method of system |
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| CN108795508A (en) * | 2018-05-23 | 2018-11-13 | 上海交通大学 | A method of detaching coke-stove gas using nitrogen and helium swell refrigeration |
| CN108802267A (en) * | 2018-06-15 | 2018-11-13 | 哈尔滨工程大学 | Hydrogen isotope gas phase exchanges hydrophobic catalyst activity rating device and evaluation method |
| CN111925043A (en) * | 2020-09-07 | 2020-11-13 | 杭州制氧机集团股份有限公司 | Device and method for producing food drinking grade light water |
| CN111925043B (en) * | 2020-09-07 | 2023-08-29 | 杭氧集团股份有限公司 | Device and method for producing food drinking grade light water |
| CN114506818A (en) * | 2022-03-25 | 2022-05-17 | 中船(邯郸)派瑞特种气体股份有限公司 | Preparation method of high-purity deuterated ammonia |
| CN114506818B (en) * | 2022-03-25 | 2023-05-09 | 中船(邯郸)派瑞特种气体股份有限公司 | Preparation method of high-purity deuterated ammonia |
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