Electronic-grade hydrochloric acid production system

Abstract

The utility model discloses an electronic-grade hydrochloric acid production system. The system comprises a heating device used for distilling out hydrogen chloride gas in industrial hydrochloric acid, and the bottom of the heating device is communicated with a raw material processing device and is connected with a primary washing device; the primary washing device is used for carrying out primary washing on the hydrogen chloride gas to obtain a primary product; wherein the first-stage washing device comprises a first-stage condenser and a first-stage washer, the condensing device is connected with the input end of the first-stage washer, the output end of the first-stage washer is connected with the input end of the first-stage condenser, the output end of the first-stage condenser is connected with the first-stage rectifying tower, and the first-stage washer is connected with the washer of the N-stage washing device; the N-stage washing device is used for carrying out primary washing on the hydrogen chloride gas to obtain an N-stage product; the N-stage washing device and the first-stage washing device have the same structure, and N is equal to 2, 3, 4,..., N. By arranging the multi-stage washing device, the purity of hydrogen chloride gas can be improved, and the purity of electronic-grade hydrochloric acid is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of electronic-grade hydrochloric acid purification technology, and specifically relates to an electronic-grade hydrochloric acid production system. Background Technology

[0002] Electronic-grade hydrochloric acid is often produced from industrial-grade 31% hydrochloric acid containing impurities. This is purified using specialized equipment to achieve high purity hydrochloric acid. Common purification processes for hydrochloric acid include isothermal diffusion, sub-boiling method, distillation, and rectification. Isothermal diffusion and sub-boiling methods have low yields; although they produce high-purity hydrochloric acid, they are suitable for small-scale experimental production and have no industrial application value. Distillation produces high-purity hydrochloric acid, but the purity and concentration are not very high. Rectification is currently the mainstream technology for purifying hydrochloric acid. It offers high yield and purity, and can be used for intermittent or continuous feeding. Although the equipment is relatively complex, it allows for large-scale production.

[0003] Electronic hydrochloric acid production typically involves direct distillation or synthesis using purified hydrogen and chlorine from the chlor-alkali industry through direct combustion. Direct distillation, which simultaneously distills hydrogen chloride and azeotropic hydrochloric acid, makes it difficult to improve product purity. The chlor-alkali industry produces large quantities of electronic-grade hydrochloric acid, requiring substantial investment in equipment, leading to severe equipment corrosion, and product quality is also difficult to improve. Utility Model Content

[0004] The purpose of this invention is to provide an electronic-grade hydrochloric acid production system to address the aforementioned problems, thereby improving the low purity, severe equipment corrosion, and low product quality issues in existing electronic hydrochloric acid production.

[0005] The technical solution adopted in this utility model is as follows: an electronic-grade hydrochloric acid production system, the system comprising: a heating device for distilling out hydrogen chloride gas from industrial hydrochloric acid, the bottom of the heater being connected to a raw material processing device and a primary washing device; a primary washing device for initially washing the hydrogen chloride gas to obtain a primary product; wherein, the primary washing device includes a primary condenser and a primary scrubber, the condenser being connected to the input end of the primary scrubber, the output end of the primary scrubber being connected to the input end of the primary condenser, the output end of the primary condenser being connected to a primary distillation column, and the primary scrubber being connected to the scrubber of an N-stage washing device; an N-stage washing device for initially washing the hydrogen chloride gas to obtain an N-stage product; the N-stage washing device has the same structure as the primary washing device, wherein N = 2, 3, 4, ..., N.

[0006] Due to the above-mentioned structure, by setting up a multi-stage washing device, the purity of hydrogen chloride gas can be improved, and the purity of electronic-grade hydrochloric acid can be further improved.

[0007] Furthermore, to improve production efficiency and enable continuous production, the raw material processing device includes a primary distillation column and a condenser. The top of the heating device is connected to the primary distillation column via a connecting pipeline and is connected to the primary washing device via the condenser. The input end of the condenser is connected to the output end of the primary distillation column. The output end of the heating device is connected to the input end of the primary distillation column, which is used to separate hydrogen chloride gas into different components for purification.

[0008] Furthermore, the primary scrubber has two input terminals. The first input terminal is connected to the condenser and is used to receive the gas condensed by the condenser for scrubbing. The second input terminal is connected to an external input pipe and is used to input detergent into the primary scrubber.

[0009] Furthermore, to ensure consistent purity after washing, the primary scrubber has two output terminals. The first output terminal is connected to the next-stage scrubber for further washing; the second output terminal is connected to the primary condenser, which is connected to the primary distillation column for outputting reflux gas.

[0010] Furthermore, in order to reduce environmental pollution, the N-stage washing device is connected to an exhaust gas treatment device, which treats the exhaust gas generated by the production system.

[0011] Furthermore, in order to adjust the temperature of the washed gas, the N-stage washing device is connected to the second heating device. The input end of the second heating device is connected to the N-stage washing device to adjust the temperature of the finished product, which facilitates subsequent steps. The output end of the second heating device is connected to the finished product device.

[0012] Furthermore, in order to further purify the washed gas, the second heating device includes a second condensing device and a final distillation column. The input end of the second condensing device is connected to the N-stage washing device, and the output end of the second condensing device is connected to the cooling pipe, the final distillation column, and the tail gas treatment device, respectively.

[0013] Furthermore, in order to improve the service life of equipment in the production system and reduce the corrosive effect of reagents on the equipment during the production process, the device is made of high-purity quartz glass or PFA.

[0014] Furthermore, in order to configure the system equipment according to actual usage needs and improve the purity of electronic-grade hydrochloric acid, the condensation device includes at least one condenser, the input end of which is connected to the primary distillation column, and the output end of which is connected to the primary scrubber.

[0015] Furthermore, in order to absorb hydrogen chloride from the gas more efficiently and reduce the emission of unabsorbed gas, the primary scrubber is equipped with saturated hydrochloric acid, and the purity of the saturated hydrochloric acid is the same as the purity of the hydrogen chloride gas in the same scrubber.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] 1. Industrial hydrochloric acid is added to a heating device for evaporation, releasing free hydrogen chloride gas. This gas then enters a primary gas scrubber, where it is washed with saturated hydrochloric acid. The gas is then sequentially passed through secondary and tertiary gas scrubbers, with the purity of the saturated hydrochloric acid in each stage matching the purity of the hydrogen chloride gas at that stage. Finally, high-purity hydrogen chloride is obtained, which is absorbed by ultrapure water and cooled to produce the desired electronic-grade hydrochloric acid. By incorporating a multi-stage scrubbing device, the purity of the hydrogen chloride gas can be improved, further enhancing the purity of the electronic-grade hydrochloric acid.

[0018] 2. The washer is equipped with saturated hydrochloric acid, and the purity of the saturated hydrochloric acid is the same as that of hydrogen chloride gas in the same type of washer. Since the chemical potential difference between saturated hydrochloric acid and hydrogen chloride gas is small, it helps to absorb the hydrogen chloride component in the gas more efficiently and reduce the emission of unabsorbed gas. Using saturated hydrochloric acid with the same purity as hydrogen chloride gas for washing can avoid the introduction of additional impurities, thereby maintaining the purity of the product. It can also reduce the pollution generated in the production process to a certain extent.

[0019] 3. The required electronic-grade hydrochloric acid is obtained by absorbing and cooling with ultrapure water. Since ultrapure water itself has extremely low impurity content, using ultrapure water as the absorbent can minimize the introduction of impurities into the product, thereby ensuring that the final electronic-grade hydrochloric acid has high purity. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall system structure of this utility model;

[0022] Figure 2 This is a schematic diagram of an embodiment of the present invention.

[0023] Reference numerals in the attached drawings: 1. Heating device; 101. Condensation device; 102. Primary distillation column; 2. First-stage scrubbing device; 201. First-stage condenser; 202. First-stage scrubber; 203. First-stage distillation column; 3. Second-stage scrubbing device; 301. Second-stage condenser; 302. Second-stage scrubber; 303. Second-stage distillation column; 4. Tail gas treatment device; 5. Second heating device; 501. Second condensation device; 502. Final distillation column; 503. Cooling pipe; 6. Finished product device. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] like Figure 1 As shown, an electronic-grade hydrochloric acid production system includes the following devices: a heating device 1, a primary washing device 2, an N-stage washing device (N=2,3,...,N), a tail gas treatment device 4, a finished product device 5, and a second heating device 6. The heating device 1 is connected to the primary washing device 2 via a raw material processing device. The raw material processing device includes a condenser 101 and a primary distillation column 102. The output end of the heating device 1 is connected to the input end of the primary distillation column 102 for separating hydrogen chloride gas into different components for purification. The output end of the primary distillation column 102 is connected to the condenser 101 for cooling the distilled gas.

[0027] The primary washing unit 2 includes a primary condenser 201 and a primary scrubber 202. The condenser 101 is connected to the input of the primary scrubber 202, and the output of the primary scrubber 202 is connected to the input of the primary condenser 201. The output of the primary condenser 201 is connected to the primary distillation column 203 to supply reflux gas. The primary distillation column 203 re-distills the reflux gas and sends it back to the primary condenser 201 for further condensation, outputting the primary product to the N-stage washing unit. The primary scrubber 202 is connected to the scrubber of the N-stage washing unit. The structure of the N-stage washing unit is the same as that of the primary washing unit 2. This multi-stage washing process yields high-purity electronic-grade hydrochloric acid.

[0028] The workflow is as follows: First, industrial hydrochloric acid is added to heating device 1 to evaporate the free hydrogen chloride gas in the raw material. The gas then passes through a raw material processing device into a primary washing device 2, where it is washed with saturated hydrochloric acid. Next, it sequentially enters a secondary washing device 3, where the purity of the saturated hydrochloric acid in each washing device is consistent with the purity of the hydrogen chloride gas in the same stage. Finally, high-purity hydrogen chloride is obtained, which is absorbed by ultrapure water and cooled to obtain the desired electronic-grade hydrochloric acid.

[0029] Example 1

[0030] like Figure 2 As shown, in one embodiment of this utility model, the washing device is configured according to actual usage needs. In this embodiment, a two-stage washing device is configured.

[0031] Heating device 1 is used to distill out hydrogen chloride gas from industrial hydrochloric acid. The bottom of heating device 1 is connected to the raw material processing device and the first-stage washing device 2.

[0032] The primary washing unit 2 is used to perform initial washing of hydrogen chloride gas to obtain a primary product. The primary washing unit 2 includes a primary condenser 201, a primary scrubber 202, and a primary distillation column 203. The primary scrubber 202 receives the gas evaporated from the heating device 1. After being washed by the primary scrubber 202, the resulting product enters the secondary washing unit 3 for further washing. The reflux gas is condensed by the primary condenser 201. The output end of the primary condenser 201 is connected to the primary distillation column 203. The condensed gas enters the primary distillation column 203 for further distillation. The output end of the primary distillation column 203 is connected to the primary scrubber 202. The distilled gas re-enters the primary scrubber 202 for re-washing. If the product conditions are met, the gas can enter the secondary washing unit 3 for secondary washing. If the product conditions are not met, the gas re-enters the primary distillation column 203 for distillation, and the above operation is repeated.

[0033] The secondary washing device 3 is used to perform secondary washing on the primary product output from the primary washing device 2. The secondary washing device 3 includes a secondary condenser 301, a secondary scrubber 302, and a secondary distillation column 303. Its operation process is the same as that of the primary washing device 2.

[0034] After the washing process, the finished product enters the second heating device 5 to adjust its temperature. The second heating device 5 includes a second condensing device 501 and a final distillation column 502. The input end of the second condensing device 501 is connected to the secondary washing device 3, and the output end of the second condensing device 501 is connected to the cooling pipe 503, the final distillation column 502, and the tail gas treatment device 4. The output end of the second heating device 5 is connected to the finished product device 6 for outputting the finished product.

[0035] Through continuous upgrading of the washing process, the final product, namely clean hydrogen chloride gas, is absorbed with ultrapure water and then cooled to obtain high-purity electronic-grade hydrochloric acid.

[0036] Example 2

[0037] Another embodiment of this utility model is that the raw material processing device includes a primary distillation column 102 and a condenser 101. The top of the heating device 1 is connected to the primary distillation column 102 through a connecting pipe, and is connected to the primary washing device 2 through the condenser 101. The input end of the condenser 101 is connected to the output end of the primary distillation column 102. The output end of the heating device 1 is connected to the input end of the primary distillation column 102, which is used to separate hydrogen chloride gas into different components for purification.

[0038] The raw material input into the raw material processing unit is industrial hydrochloric acid. Free hydrogen chloride gas in the industrial hydrochloric acid is distilled out through the primary distillation column 102. High-purity hydrogen chloride gas is obtained through multi-stage washing. After cooling, electronic-grade hydrochloric acid is obtained. The finished product is then output to the finished product unit for storage.

[0039] The raw material processing unit, as a primary processing system, distills and purifies the free hydrogen chloride in industrial hydrochloric acid, which not only improves utilization but also enables continuous production and increases production efficiency.

[0040] Example 3

[0041] In another embodiment of this utility model, the primary scrubber 2 has two input terminals. The first input terminal is connected to the condenser 101 and is used to receive the gas condensed by the condenser 101 for scrubbing. The second input terminal is connected to an external input pipe for inputting detergent into the primary scrubber 202. The detergent is saturated hydrochloric acid, and the purity of the saturated hydrochloric acid is the same as the purity of the gas in the primary scrubber 202.

[0042] The primary scrubber 202 has two output terminals. The first output terminal is connected to the next-stage scrubber for further scrubbing. The second output terminal is connected to the primary condenser 201, which is connected to the primary distillation column 203 for outputting reflux gas. The reflux gas passes through the primary condenser 201 and enters the primary distillation column 203 for distillation. The reagents in the primary distillation column 203 are input through an external pipeline. The gas after distillation in the primary distillation column 203 returns to the primary scrubber 202 for re-scrubbing. After scrubbing, the gas enters the next-stage scrubber for further scrubbing.

[0043] By using the reflux setting of the distillation unit, each stage of the scrubber can wash the gas to the specified purity, thus facilitating step-by-step scrubbing.

[0044] Example 4

[0045] Based on the aforementioned embodiments, the present invention can also adopt the following configuration: after washing, the finished product is absorbed by ultrapure water, and then the finished product is cooled to obtain high-purity electronic-grade hydrochloric acid. The quality of the ultrapure water should be consistent with or higher than the quality of the desired product.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electronic-grade hydrochloric acid production system, characterized in that, The system includes: The heating device is used to distill out hydrogen chloride gas from industrial hydrochloric acid. The bottom of the heater is connected to the raw material processing device and the primary washing device. A primary washing unit is used to perform initial washing of hydrogen chloride gas to obtain a primary product; wherein, the primary washing unit includes a primary condenser and a primary scrubber, the condenser is connected to the input end of the primary scrubber, the output end of the primary scrubber is connected to the input end of the primary condenser, the output end of the primary condenser is connected to the primary distillation column, and the primary scrubber is connected to the scrubber of the N-stage washing unit. The N-stage washing unit is used to perform initial washing of hydrogen chloride gas to obtain N-stage product; the N-stage washing unit has the same structure as the first-stage washing unit, where N = 2, 3, 4, ..., N.

2. The electronic-grade hydrochloric acid production system according to claim 1, characterized in that, The raw material processing device includes a primary distillation column and a condenser. The top of the heating device is connected to the primary distillation column via a connecting pipeline and is connected to the primary washing device via the condenser. The input end of the condenser is connected to the output end of the primary distillation column. The output end of the heating device is connected to the input end of the primary distillation column, which is used to separate hydrogen chloride gas into different components for purification.

3. The electronic-grade hydrochloric acid production system according to claim 2, characterized in that, The primary scrubber has two input terminals. The first input terminal is connected to the condenser and is used to receive the gas condensed by the condenser for scrubbing. The second input terminal is connected to an external input pipe and is used to input detergent into the primary scrubber.

4. The electronic-grade hydrochloric acid production system according to claim 3, characterized in that, The primary scrubber has two output terminals. The first output terminal is connected to the next stage scrubber for further scrubbing. The second output terminal is connected to the primary condenser, which is connected to the primary distillation column for outputting reflux gas.

5. The electronic-grade hydrochloric acid production system according to claim 1, characterized in that, The N-stage washing device is connected to the exhaust gas treatment device, which treats the exhaust gas generated by the production system.

6. The electronic-grade hydrochloric acid production system according to claim 5, characterized in that, The N-stage washing device is connected to the second heating device. The input end of the second heating device is connected to the N-stage washing device to adjust the temperature of the finished product, which facilitates subsequent steps. The output end of the second heating device is connected to the finished product device.

7. The electronic-grade hydrochloric acid production system according to claim 6, characterized in that, The second heating device includes a second condensing device and a final distillation column. The input end of the second condensing device is connected to the N-stage washing device, and the output end of the second condensing device is connected to the cooling pipe, the final distillation column, and the tail gas treatment device, respectively.

8. The electronic-grade hydrochloric acid production system according to claim 1, characterized in that, The system is made of high-purity quartz glass or PFA.

9. The electronic-grade hydrochloric acid production system according to claim 1, characterized in that, The condensation device includes at least one condenser, the input end of which is connected to the primary distillation column, and the output end of which is connected to the primary scrubber.

10. The electronic-grade hydrochloric acid production system according to claim 1, characterized in that, The primary scrubber contains saturated hydrochloric acid, and the purity of the saturated hydrochloric acid is the same as the purity of the hydrogen chloride gas in the same scrubber.

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