阅读说明：本技术 一塔式生产多种丰度硼10同位素的装置与生产方法 (Device and method for producing various abundant boron 10 isotopes in one tower ) 是由 刘广才 余威 袁福龙 王久富 王昆 于 2021-09-15 设计创作，主要内容包括：本发明提出一塔式生产多种丰度硼10同位素的装置与生产方法,该装置的同位素分离塔的进料口连接自动控制进料系统,同位素分离塔的顶部连接塔顶冷凝器,底部连接塔底再沸器,同位素分离塔的顶部出料口连接塔顶自动控制采出系统,底部出料口连接塔底自动控制产品采出系统,塔顶冷凝器连接多个低温制冷装置,进行不同制冷温度和压力下的分离。解决富集每种丰度硼10同位素产品,需要单独分离塔完成,投资巨大的技术问题,本发明通过改变分离塔塔顶冷凝器冷媒介质温度,来改变分离塔操作饱和蒸汽压力,使分离塔获得不同分离系数(相对挥发度),最终获得不同丰度硼同位素产品,一塔生产多种不同丰度硼同位素产品,减少工程投资。(The invention provides a tower-type device and a production method for producing various abundant boron 10 isotopes, wherein a feed inlet of an isotope separation tower of the device is connected with an automatic control feed system, the top of the isotope separation tower is connected with a tower top condenser, the bottom of the isotope separation tower is connected with a tower bottom reboiler, a discharge outlet at the top of the isotope separation tower is connected with a tower top automatic control extraction system, a discharge outlet at the bottom of the isotope separation tower is connected with a tower bottom automatic control product extraction system, and the tower top condenser is connected with a plurality of low-temperature refrigerating devices for separation at different refrigerating temperatures and pressures. The invention changes the operation saturated vapor pressure of the separation tower by changing the temperature of the cold medium of the condenser at the top of the separation tower, so that the separation tower obtains different separation coefficients (relative volatility), finally obtains boron isotope products with different abundances, produces a plurality of boron isotope products with different abundances by one tower, and reduces the engineering investment.)

1. A tower-type device for producing various abundant boron 10 isotopes is characterized by comprising an isotope separation tower (1), a tower top condenser (2), a tower bottom reboiler (3), a plurality of low-temperature refrigeration devices, an automatic control feeding system (5), a tower top automatic control extraction system (6) and a tower bottom automatic control product extraction system (7), the feed inlet of the isotope separation tower (1) is connected with an automatic control feeding system (5), the top of the isotope separation tower (1) is connected with a tower top condenser (2), the bottom is connected with a tower bottom reboiler (3), a discharge port at the top of the isotope separation tower (1) is connected with an automatic control extraction system (6) at the top of the tower, a discharge port at the bottom of the isotope separation tower is connected with an automatic control product extraction system (7) at the bottom of the tower, the tower top condenser (2) is connected with a plurality of low-temperature refrigerating devices to separate under different refrigerating temperatures and pressures.

2. The device for producing the boron 10 isotopes in multiple abundances in the tower type according to claim 1, wherein the multiple cryogenic refrigeration devices comprise a first cryogenic refrigeration device (4-1), a second cryogenic refrigeration device (4-2) and a third cryogenic refrigeration device (4-3), wherein the unit operation temperature of the first cryogenic refrigeration device (4-1) is-110 to-135 ℃, the unit operation temperature of the second cryogenic refrigeration device (4-2) is-65 to-80 ℃, and the unit operation temperature of the third cryogenic refrigeration device (4-3) is-40 ℃ to 60 ℃.

3. The tower type device for producing the boron 10 isotopes in various abundances according to claim 2, wherein when the boron 10 isotopes in 96% abundance are produced, the first cryogenic refrigeration device (4-1) is started to provide cold for the isotope separation tower (1), and the isotope separation tower (1) is operated under normal pressure.

4. The tower-type device for producing the boron 10 isotopes in various abundances according to claim 2, wherein when the boron 10 isotopes in the abundance of 60% are produced, the second cryogenic refrigeration device (4-2) is started to provide refrigeration for the isotope separation tower (1), and the air pressure in the isotope separation tower (1) is 1.0 MPa.

5. The tower type apparatus for producing boron 10 isotopes in various abundances according to claim 2, wherein when producing boron 10 isotopes in 40% abundance, a third cryogenic refrigeration apparatus (4-3) is started to supply refrigeration to the separation tower system, and the air pressure in the isotope separation tower (1) is 2.5 MPa.

6. The device for tower-type production of multiple abundance boron 10 isotopes according to claim 1, wherein the actual operating pressure at the top of the isotope separation tower (1) is from atmospheric pressure to 2.5 MPa.

7. The device for producing the boron 10 isotopes in multiple abundances in the tower type according to claim 1, wherein the operating temperature of the top of the isotope separation tower (1) is-100.7 ℃ to-33 ℃.

8. The device for tower-type production of multiple abundance boron 10 isotopes according to claim 1, wherein the number of theoretical plates of the isotope separation tower (1) is 800.

9. The device for tower-type production of multiple abundance boron 10 isotopes according to claim 1, wherein the actual number of plates of the isotope separation tower (1) is 1200.

10. A production method for producing multiple abundance boron 10 isotopes by using a tower type apparatus as claimed in any one of claims 1-9, which comprises the following steps:

(1) firstly, aiming at producing boron 10 isotopes with different abundances, a corresponding low-temperature refrigeration system is started to cool an isotope separation tower (1);

(2) after the temperature meets the requirement, feeding boron trifluoride gas into the isotope separation tower (1) by an automatic control feeding system (5) in the isotope separation tower (1), precooling the gas to be liquid after the gas reaches the top of the tower, feeding the boron trifluoride liquid into a tower bottom reboiler (3) along the tower, stopping feeding the liquid, feeding a heating medium into the tower bottom reboiler (3), heating the boron trifluoride liquid, vaporizing the boron trifluoride, ascending the gas along the tower to a tower top condenser (2) to be condensed, and performing gas-liquid exchange between the descending of the condensed liquid along the tower and the ascending gas to realize the isotope separation of boron 10 and boron 11;

(3) after gas-liquid exchange is carried out for a period of time, after the abundance of boron 10 at the bottom of the tower meets the requirement, the boron trifluoride of the boron 10 is extracted through the automatic control product extraction system (7) at the bottom of the tower according to the required quantity, meanwhile, the boron trifluoride gas is fed through the automatic control feeding system (5) according to the required quantity, and the boron trifluoride gas with the abundance of boron 10 reduced is extracted through the automatic control extraction system (6) at the top of the tower.

Technical Field

The invention relates to a device and a method for producing various abundant boron 10 isotopes in a tower mode, and belongs to the technical field of devices for producing boron 10 isotopes.

Background

The number of boron element protons is 5, natural boron has two stable isotopes, wherein the isotope with the neutron number of 5 is called boron 10 isotope (boron 10 for short), the isotope with the neutron number of 6 is called boron 11 isotope (boron 11 for short), the isotope abundance of the natural boron 10 is 19.78%, and the isotope abundance of the boron 11 is 80.22%. The main reason for promoting the rapid development of boron isotope separation is the great difference of boron isotopes in the absorption cross section of thermal neutrons: the absorption cross section of boron 10 for thermal neutrons is 3837 bar, while boron 11 is only 0.005 bar, and the absorption cross section of boron with natural abundance for thermal neutrons is close to 750 bar, so that the absorption cross section of boron 10 for thermal neutrons is more than 5 times that of boron with natural abundance.

The application fields of the boron 10 isotope are: the material can be used as a control material for the stable operation of a nuclear reactor, a control rod of the nuclear reactor, a radiation-proof shielding material of the nuclear reactor and a packaging material for the storage and transportation of dangerous waste materials, radiation-proof protection of weaponry and the like. According to the demand of boron isotope separation markets, the products can be classified into the following products, the abundance is more than 96 percent, and the products are used for medical treatment and reactor control rods; the abundance of 60 percent is used for reactor shielding materials, military equipment armor protection and nuclear waste packaging materials; the abundance of 35 percent is used for controlling the stable operation of the reactor by one-way water of the nuclear reactor.

The industrial production process for really realizing the boron 10 isotope comprises an ether boron trifluoride complex chemical exchange rectification separation process, a methyl ether boron trifluoride complex chemical exchange rectification separation process, an anisole boron trifluoride complex chemical exchange rectification separation process and a boron trifluoride low-temperature chemical exchange rectification separation process. Each process has advantages and disadvantages:

the ether process is carried out under the vacuum condition, once a certain part of the system leaks, air enters, water in the air reacts with boron trifluoride, and products seriously corrode equipment and block the equipment.

The process conditions of the dimethyl ether process are wider than those of the diethyl ether process, but the boron trifluoride complex of dimethyl ether produced by the dimethyl ether process is useless, so that the environmental protection treatment cost is extremely high, the environmental pollution can be caused carelessly, and the process is eliminated.

The anisole process has many advantages, but the process has a long flow path and requires 5-column continuous operation. It is well known that isotope separation difficulty is high, the single tower is difficult to realize ultra-long period and ultra-long stable operation, 5 towers are required to be absolutely coordinated and reliably operated, and the whole set of production device is difficult to realize ultra-long period and ultra-long stable operation, so that many hidden dangers exist.

The low temperature boron trifluoride process has two advantages: 1. the separation process does not produce any chemical change and has no corrosion problem, and the separation equipment is made of 304 stainless steel; 2. the price of the by-product is not very expensive, a large amount of by-product high-purity boron trifluoride can be produced, and the price of the high-purity boron trifluoride is about 100 ten thousand yuan/ton.

The low-temperature process has the defects that 1, the low-temperature production cost is high (the refrigeration cost is high); 2. the low-temperature process has small separation coefficient, a plurality of theoretical plates of the rectifying tower, high separation tower and large engineering investment. The patent technology mainly solves two problems of large engineering investment and high operation cost.

At present, the boron isotope market requires varieties with 96% boron 10 abundance, 60% boron 10 abundance and 40% boron 10 abundance. Aiming at the market demand of boron isotopes, the production scheme of the prior art is that an abundance 96% separation device, an abundance 60% separation device and an abundance 40% separation device are respectively constructed. All the separation devices are operated under normal pressure, and the temperature of the tower top is controlled to be 100.7 ℃. The separation devices with different abundances have different heights, and the height of the tower is increased to different degrees along with the increase of the requirement of the separation abundance. The cold energy required by the condensation of the separation tower comes from different schemes, wherein 1 is air refrigeration, and 2 is ordinary freon refrigeration. Air refrigeration is to compress air, change nitrogen in the air into liquid nitrogen at-196 ℃ through expansion, send the liquid nitrogen to the tower top, and cool rising boron trifluoride gas through a heat exchanger as a cooling medium. The ordinary freon refrigeration is to compress and condense the refrigeration medium, and the condensate is throttled and expanded to perform refrigeration, wherein the refrigeration temperature is generally-110 ℃ and 125 ℃. The produced cold is conveyed to the top of the tower by the secondary refrigerant, and the ascending boron trifluoride gas is cooled by the heat exchanger.

Isotope separation difficulty is large, and is mainly shown in the following aspects: a. the separation tower has a large number of theoretical plates, and the number of the theoretical plates of the rectification of common products is several to dozens, actually several to twenty. The boron isotope separation tower has few theoretical plate numbers, hundreds of theoretical plate numbers and thousands of theoretical plate numbers, the constructed separation tower is as high as one hundred meters or even several hundred meters, the engineering difficulty is large, and the project construction investment is expensive.

Because the boron isotope separation device has huge investment, the market requires boron isotope products with different abundances to meet the requirements. If different separation columns are required to be built for each abundant boron isotope, the investment is not imaginable. How to reduce the investment and produce products with different requirements becomes a great problem of boron isotope separation.

Disclosure of Invention

The invention provides a device and a production method for producing various abundant boron 10 isotopes in one tower type, aiming at solving the technical problems that enrichment of each abundant boron 10 isotope product needs to be completed by a separate separation tower and the investment is huge in the background technology. One tower can produce various boron isotope products with different abundances, and the engineering investment is reduced.

The invention provides a tower-type device for producing various abundant boron 10 isotopes, which comprises an isotope separation tower, a tower top condenser, a tower bottom reboiler, a plurality of low-temperature refrigerating devices, an automatic control feeding system, a tower top automatic control extracting system and a tower bottom automatic control product extracting system, wherein a feeding hole of the isotope separation tower is connected with the automatic control feeding system, the top of the isotope separation tower is connected with the tower top condenser, the bottom of the isotope separation tower is connected with the tower bottom reboiler, a top discharging hole of the isotope separation tower is connected with the tower top automatic control extracting system, a bottom discharging hole of the isotope separation tower is connected with the tower bottom automatic control product extracting system, and the tower top condenser is connected with the plurality of low-temperature refrigerating devices for separation at different refrigerating temperatures and pressures.

Preferably, the plurality of low-temperature refrigerating devices comprise a first low-temperature refrigerating device, a second low-temperature refrigerating device and a third low-temperature refrigerating device, wherein the unit operation temperature of the first low-temperature refrigerating device is-110 to-135 ℃, the unit operation temperature of the second low-temperature refrigerating device is-65 to-80 ℃, and the unit operation temperature of the third low-temperature refrigerating device is-40 to 60 ℃.

Preferably, when the isotope of boron 10 with the abundance of 96% is produced, a first cryogenic refrigeration device is started to provide cold for the isotope separation tower, and the isotope separation tower is operated under normal pressure.

Preferably, when the boron 10 isotope with the abundance of 60% is produced, the second cryogenic refrigeration device is started to provide cold energy for the isotope separation tower, and the air pressure in the isotope separation tower is 1.0 MPa.

Preferably, when the boron 10 isotope with the abundance of 40% is produced, a third cryogenic refrigeration device is started to provide cold energy for the separation tower system, and the air pressure in the isotope separation tower is 2.5 MPa.

Preferably, the actual operating pressure of the top of the isotope separation column is from atmospheric pressure to 2.5 MPa.

Preferably, the top operating temperature of the isotope separation column is-100.7 ℃ to-33 ℃.

Preferably, the number of theoretical plates of the isotope separation column is 800.

Preferably, the actual number of plates of the isotope separation column is 1200.

A method for producing multiple abundances of boron 10 isotopes by using the device for producing multiple abundances of boron 10 isotopes in one tower type specifically comprises the following steps:

(1) firstly, aiming at producing boron 10 isotopes with different abundances, a corresponding refrigeration system is started to cool an isotope separation tower;

(2) after the temperature meets the requirement, boron trifluoride gas is fed into the isotope separation tower through an automatic control feeding system in the isotope separation tower, the gas is precooled to become liquid after reaching the top of the tower, the boron trifluoride liquid flows down to a reboiler at the bottom of the tower to reach a specified liquid level height, feeding is stopped at the moment, a heating medium is fed into the reboiler at the bottom of the tower to heat the boron trifluoride liquid, the boron trifluoride is vaporized, the gas rises to a condenser at the top of the tower along the tower and is condensed, the gas-liquid exchange is formed between the downward flow of the condensed liquid and the rising gas, and the isotope separation of boron 10 and boron 11 is realized;

(3) after gas-liquid exchange is carried out for a period of time, after the abundance of boron 10 at the bottom of the tower meets the requirement, the boron trifluoride of the product boron 10 is extracted by the automatic control extraction system at the bottom of the tower according to the required quantity, meanwhile, the boron trifluoride gas is fed by the automatic control feeding system according to the required quantity, and the boron trifluoride gas with the abundance of boron 10 reduced is extracted by the automatic control extraction system at the top of the tower.

The device and the production method for producing the boron 10 isotopes with various abundances in one tower have the beneficial effects that:

(1) and the engineering investment is saved. The invention changes the operating saturated vapor pressure of the separation tower by changing the temperature of the refrigerant medium of the condenser at the top of the separation tower, so that the separation tower obtains different separation coefficients (relative volatility) and finally obtains boron isotope products with different abundances. The production of products with respective abundance by a plurality of single towers is changed into the production of various boron isotope products with different abundances by one tower, so that the number of a tower top condenser, a tower bottom reboiler, a tower feeding automatic control system, a tower top discharging automatic control system and a tower bottom product extracting automatic control system can be reduced. In addition, the investment of the tower body is reduced, and compared with an independent three-tower system, the single-tower system saves half of the engineering investment.

(2) And the operation cost is saved. As the cooling temperature decreases, the power consumed by cooling increases due to the same amount of cooling. For example: the nominal refrigerating capacity is 35KW, the temperature is-130 ℃, the power of the refrigerating unit is about 1200KW, the nominal refrigerating capacity is 35KW, the temperature is-50 ℃, and the power of the refrigerating unit is about 100 KW.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In the drawings:

FIG. 1 is a schematic structural diagram of a device for producing multiple abundance boron 10 isotopes in a tower manner according to the invention;

the system comprises an isotope separation tower 1, an isotope separation tower 2, a tower top condenser 2, a tower bottom reboiler 3, a low-temperature refrigerating device 4-1-I, a low-temperature refrigerating device 4-2-II, a low-temperature refrigerating device 4-3-III, an automatic control feeding system 5, an automatic control extraction system at the tower top 6 and an automatic control product extraction system at the tower bottom 7.

Detailed Description

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:

the first embodiment is as follows: the present embodiment is explained with reference to fig. 1. This embodiment a tower production multiple abundance boron 10 isotope's device, including isotope knockout tower 1, overhead condenser 2, reboiler 3 at the bottom of the tower, a plurality of low temperature refrigerating plant, automatic control charge-in system 5, top of the tower automatic control extraction system 6 and automatic control product extraction system 7 at the bottom of the tower, automatic control charge-in system 5 is connected to the feed inlet of isotope knockout tower 1, overhead condenser 2 is connected at the top of isotope knockout tower 1, reboiler 3 at the bottom of the tower is connected to the bottom, top of the tower automatic control extraction system 6 is connected to the top discharge gate of isotope knockout tower 1, and automatic control product extraction system 7 at the bottom of the tower is connected to the bottom discharge gate, overhead condenser 2 is connected a plurality of low temperature refrigerating plant, carries out the separation under different refrigeration temperature and the pressure.

The plurality of low-temperature refrigerating devices comprise a first low-temperature refrigerating device 4-1, a second low-temperature refrigerating device 4-2 and a third low-temperature refrigerating device 4-3, wherein the unit operation temperature of the first low-temperature refrigerating device 4-1 is-110 to-135 ℃, the unit operation temperature of the second low-temperature refrigerating device 4-2 is-65 to-80 ℃, and the unit operation temperature of the third low-temperature refrigerating device 4-3 is-40 ℃ to 60 ℃.

The actual operation pressure at the top of the isotope separation tower 1 is from normal pressure to 2.5 MPa.

The operation temperature of the top of the isotope separation tower 1 is-100.7 ℃ to-33 ℃.

Comprehensively considering the number of theoretical plates required by a plurality of towers in the past, building one low-temperature boron trifluoride 10 isotope separation device with 800 theoretical plates (the actual number of plates is 1200) (to further ensure the reliable realization of abundance ratio, 1500 blocks are actually built) (according to the packing parameters provided by a packing manufacturer), mainly comprising the following steps: the system comprises a tower body, a tower top condenser 2, a tower bottom reboiler 3, an automatic control feeding system 5, a tower top automatic control extraction system 6 and a tower bottom automatic control product extraction system 7. In addition, 3 sets of low-temperature refrigerating systems are matched and constructed, including a first low-temperature refrigerating system at the temperature of-110 ℃ to-135 ℃, a second low-temperature refrigerating system at the temperature of-65 ℃ to-80 ℃, and a third low-temperature refrigerating system at the temperature of-40 ℃ to-60 ℃.

The method for producing the boron 10 isotopes with various abundances by using the device for producing the boron 10 isotopes with various abundances in one tower type specifically comprises the following steps:

(1) firstly, aiming at producing boron 10 isotopes with different abundances, a corresponding low-temperature refrigeration system is started to cool an isotope separation tower 1, and the pressure in the isotope separation tower 1 is changed; the solenoid valves are opened primarily through each cryogenic refrigeration system, with one cryogenic refrigeration system being open and the other two being closed.

(2) After the temperature meets the requirement, boron trifluoride gas is fed into the isotope separation tower 1 through an automatic control feeding system 5 in the isotope separation tower 1, after the gas reaches the tower top, the gas is precooled to become liquid, the boron trifluoride liquid flows down to a tower bottom reboiler 3 and reaches a specified liquid level height, the feeding is stopped at the moment, a heating medium is fed into the tower bottom reboiler 3 to heat the boron trifluoride liquid, the boron trifluoride is vaporized, the gas rises to a tower top condenser 2 along the tower and is condensed, the gas-liquid exchange is formed between the downward flow of the condensed liquid and the rising gas along the tower, and the isotope separation of boron 10 and boron 11 is realized;

(3) after gas-liquid exchange is carried out for a period of time, the abundance of boron 10 at the bottom of the tower meets the requirement, and then the boron trifluoride of the product boron 10 is extracted through the automatic control extraction system 7 at the bottom of the tower according to the required quantity. Meanwhile, boron trifluoride gas is fed in according to the required quantity through the feeding automatic control system, the extraction system 7 is also automatically controlled at the top of the tower, the boron trifluoride gas with the boron 10 abundance reduced is extracted, and at the moment, the isotope separation tower enters a normal continuous separation state. Since boron 10 is liquid, it flows down to the bottom of the automatically controlled extraction system 7 for collection.

When producing 96% boron 10 isotope abundance, starting a first low-temperature refrigerating device 4-1 to provide cold energy for the isotope separation tower 1, wherein the isotope separation tower 1 is operated under normal pressure, after normal operation, boron trifluoride with 96% abundance is produced at the bottom of the tower, and the required 96% boron 10 product is obtained through various conversions.

When producing boron 10 isotope with 60% abundance, starting a second low-temperature refrigerating device 4-2 to provide cold energy for the isotope separation tower 1, wherein the air pressure in the isotope separation tower 1 is 1.0MPa, and after normal operation, boron trifluoride with 60% abundance extracted from the bottom of the tower is converted to obtain the required boron 10 product with 60% abundance.

When the boron 10 isotope with the production abundance of 40 percent is produced, a third low-temperature refrigerating device 4-3 is started to provide cold energy for the separation tower system, and the air pressure in the isotope separation tower 1 is 2.5 MPa. After normal operation, boron trifluoride with the abundance of 40% is extracted from the bottom of the tower, and a boron 10 product with the abundance of 40% is obtained through various conversions.

The following data are measured by a boron trifluoride low-temperature isotope experimental tower:

1) low temperature and normal pressure operation at-100.7 deg.c, and boron 10 isotope separation relative volatility alpha about 1.0067 (value 1.0062-1.0073).

2) A relative volatility alpha of 1.0033 (value of 1.0029-1.0036) for boron 10 isotope separation by operating at-60 ℃ and 1MPa under pressure

3) 33 ℃ and 2.5MPa, and the relative volatility alpha of boron 10 isotope separation is about 1.0021 (the value is 1.0019-1.0022)

2. Theoretical plate number calculation for separation column

Theoretical plate number calculation formula N ═ Lg { (1-Xw)/Xw (Xd/(1-Xd)) }/Lg α^-1

(1) Calculating the theoretical plate number of the separating tower with the abundance of 96 percent: volatile component Xw at the bottom of the tower is 12 percent; the volatile component Xd at the top of the tower is 96 percent

N＝Lg{(1-0.12)/0.12(0.96(1-0.96)}/Lg1.0067^-1773 pieces.

(2) Calculating the theoretical plate number of the separation tower with the abundance of 60 percent: volatile component Xw at the bottom of the tower is 12 percent; the volatile component Xd at the top of the tower is 60 percent

N＝Lg{(1-0.12)/0.12(0.6(1-0.6)}/Lg1.0033^-1727 blocks.

(3) Calculating the theoretical plate number of the separation tower with the abundance of 40 percent: volatile component Xw at the bottom of the tower is 12 percent; volatile component Xd at the top of the tower is 40%

N { (1-0.12)/0.12(0.4(1-0.4) }/Lg1.0021-1 ═ 757 blocks.

The technology changes the pressure (saturated vapor pressure of boron trifluoride) of a boron trifluoride cryogenic rectification system, changes the relative volatility of boron trifluoride gas 10 and boron trifluoride gas 11, and obtains different separation effects by using one tower to obtain products with different abundances required by people. A process for separating boron trifluoride 10 isotope at low temperature comprises cooling boron trifluoride gas to liquefy the boron trifluoride gas, and separating boron trifluoride 10 and boron trifluoride 11 in a gas-liquid exchange manner.

The invention adopts a tower to replace a plurality of towers to produce boron 10 isotopes with different abundances in stages according to the needs of the market on the boron 10 isotopes. The product rectification process is a process for separating two materials in a rectification tower by utilizing the difference of relative volatility of the two mixed materials. The relative volatility of the same mixed material is different under different saturated vapor pressures, and the higher the pressure is, the lower the relative volatility is. In the same tower, the higher the relative volatility of the same material is, the higher the separation effect is, and the higher the content of the obtained product is, on the contrary, the poorer the separation effect is, and the more components to be removed are contained in the product.

The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.