A hydrogen selenide preparing method

Abstract

The invention relates to a hydrogen selenide preparing method. The method includes S1) adding a sulfur-containing selenium raw material into a reaction furnace; S2) feeding heated hydrogen into the reaction furnace; S3) generating hydrogen selenide by reacting selenium and the hydrogen under heated conditions in the reaction furnace, and mixing the hydrogen selenide into a mixed gas; S4) cooling the mixed gas discharged from the reaction furnace and performing separation to obtain selenium vapor; S5) condensing and liquefying the cooled mixed gas in a condenser; S6) when 5-15% of the selenium raw material is consumed, filling a container with the liquified hydrogen selenide for collection; S7) allowing the reaction to be continued, and filling a container with the liquified hydrogen selenide for collection when 40-60% of the selenium raw material is consumed; S8) allowing the reaction to be continued, and filling a container with the liquified hydrogen selenide for collection when 85-95% of the selenium raw material is consumed; and S9) repeating the S2) step to the S8) step. According to the method, hydrogen selenide products having different hydrogen sulfide contents are obtained through staged collection manners, thus meeting different demands of different customers.

Description

technical field

[0001] The invention relates to the field of preparation of hydrogen selenide, in particular to a preparation method of hydrogen selenide. Background technique

[0002] Hydrogen selenide is an important raw material for making infrared material zinc selenide lenses and other metal selenides, and it is also a raw material for epitaxy, ion implantation and doping in the production of solar cells, semiconductors and integrated circuits. In the process of directly combining selenium and hydrogen as raw materials to generate hydrogen selenide, because the impurity sulfur in selenium will also react with hydrogen to generate hydrogen sulfide, which is mixed in hydrogen selenide and is difficult to remove. Therefore, sulfur becomes hydrogen selenide Impurities that are difficult to remove. In the prior art, the method of removing impurity sulfur in advance is generally used to solve the above problems. However, the procedure is relatively complicated, and other pro...

Examples

preparation example Construction

[0023] A preparation method for hydrogen selenide, comprising the steps of:

[0024] S1: Using the feeding device, add the selenium raw material containing 0.1-100ppm sulfur into the reaction furnace;

[0025] S2: using the hydrogen gas feeding path to feed the heated hydrogen gas into the reaction furnace;

[0026] S3: Under the heating condition in the reaction furnace, selenium and hydrogen are combined to form hydrogen selenide, and hydrogen selenide is mixed into the mixed gas;

[0027] S4: The mixed gas out of the reaction furnace is cooled to lower the temperature, and the selenium vapor is separated;

[0028] S5: The cooled mixed gas is condensed and liquefied in the condenser, and the uncollected hydrogen is returned to S2 through the circulating compressor to participate in the reaction with the newly introduced hydrogen;

[0029] S6: When 5-15% of the selenium raw material is consumed, the liquefied hydrogen selenide in the condenser is charged and collected to ob...

Embodiment 1

[0039] In a selenium reaction furnace, 500kg of selenium powder containing 0.1ppm of sulfur is dropped into by a feeding device, the air is replaced with hydrogen, heated and melted, then added to the hydrogen selenide reaction furnace. The reaction furnace is heated to 400°C, and hydrogen gas is introduced to react. The mixed gas generated by the reaction is cooled to 35°C to separate the selenium vapor, and then enters a condenser with a pressure of 8 atmospheres and a temperature of -50°C to condense and liquefy the hydrogen selenide and collect it. The uncondensed hydrogen is pressurized by the compressor and returned to the reaction furnace to participate in the reaction with the newly injected hydrogen. When 10% of the selenium raw material is consumed, the hydrogen selenide in the condenser is charged and collected for the first time to obtain the first hydrogen selenide product. When 50% of the selenium raw material is consumed, the hydrogen selenide in the condenser ...

Embodiment 2

[0043] In a selenium reaction furnace, utilize the feeding device to drop into 500kg of selenium powder containing 11ppm sulfur, replace the air with hydrogen, heat and melt and add it to the hydrogen selenide reaction furnace. The reaction furnace is heated to 500°C, and hydrogen gas is introduced to react. The mixed gas generated by the reaction is cooled to 50°C to separate the selenium vapor, and then enters a condenser with a pressure of 10 atmospheres and a temperature of -50°C to liquefy and collect hydrogen selenide. The uncondensed hydrogen is pressurized by the compressor and returned to the reaction furnace to participate in the reaction with the newly injected hydrogen. When 5% of the selenium raw material is consumed, the hydrogen selenide in the condenser is charged and collected for the first time to obtain the first hydrogen selenide product. When 40% of the selenium raw material is consumed, the hydrogen selenide in the condenser is filled and collected for t...

technical field

[0001] The invention relates to the field of preparation of hydrogen selenide, in particular to a preparation method of hydrogen selenide. Background technique

[0002] Hydrogen selenide is an important raw material for making infrared material zinc selenide lenses and other metal selenides, and it is also a raw material for epitaxy, ion implantation and doping in the production of solar cells, semiconductors and integrated circuits. In the process of directly combining selenium and hydrogen as raw materials to generate hydrogen selenide, because the impurity sulfur in selenium will also react with hydrogen to generate hydrogen sulfide, which is mixed in hydrogen selenide and is difficult to remove. Therefore, sulfur becomes hydrogen selenide Impurities that are difficult to remove. In the prior art, the method of removing impurity sulfur in advance is generally used to solve the above problems. However, the procedure is relatively complicated, and other pro...

Examples

preparation example Construction

[0023] A preparation method for hydrogen selenide, comprising the steps of:

[0024] S1: Using the feeding device, add the selenium raw material containing 0.1-100ppm sulfur into the reaction furnace;

[0025] S2: using the hydrogen gas feeding path to feed the heated hydrogen gas into the reaction furnace;

[0026] S3: Under the heating condition in the reaction furnace, selenium and hydrogen are combined to form hydrogen selenide, and hydrogen selenide is mixed into the mixed gas;

[0027] S4: The mixed gas out of the reaction furnace is cooled to lower the temperature, and the selenium vapor is separated;

[0028] S5: The cooled mixed gas is condensed and liquefied in the condenser, and the uncollected hydrogen is returned to S2 through the circulating compressor to participate in the reaction with the newly introduced hydrogen;

[0029] S6: When 5-15% of the selenium raw material is consumed, the liquefied hydrogen selenide in the condenser is charged and collected to ob...

Embodiment 1

[0039] In a selenium reaction furnace, 500kg of selenium powder containing 0.1ppm of sulfur is dropped into by a feeding device, the air is replaced with hydrogen, heated and melted, then added to the hydrogen selenide reaction furnace. The reaction furnace is heated to 400°C, and hydrogen gas is introduced to react. The mixed gas generated by the reaction is cooled to 35°C to separate the selenium vapor, and then enters a condenser with a pressure of 8 atmospheres and a temperature of -50°C to condense and liquefy the hydrogen selenide and collect it. The uncondensed hydrogen is pressurized by the compressor and returned to the reaction furnace to participate in the reaction with the newly injected hydrogen. When 10% of the selenium raw material is consumed, the hydrogen selenide in the condenser is charged and collected for the first time to obtain the first hydrogen selenide product. When 50% of the selenium raw material is consumed, the hydrogen selenide in the condenser ...

Embodiment 2

[0043] In a selenium reaction furnace, utilize the feeding device to drop into 500kg of selenium powder containing 11ppm sulfur, replace the air with hydrogen, heat and melt and add it to the hydrogen selenide reaction furnace. The reaction furnace is heated to 500°C, and hydrogen gas is introduced to react. The mixed gas generated by the reaction is cooled to 50°C to separate the selenium vapor, and then enters a condenser with a pressure of 10 atmospheres and a temperature of -50°C to liquefy and collect hydrogen selenide. The uncondensed hydrogen is pressurized by the compressor and returned to the reaction furnace to participate in the reaction with the newly injected hydrogen. When 5% of the selenium raw material is consumed, the hydrogen selenide in the condenser is charged and collected for the first time to obtain the first hydrogen selenide product. When 40% of the selenium raw material is consumed, the hydrogen selenide in the condenser is filled and collected for t...

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